CVE-2026-31748

Description

In the Linux kernel, the following vulnerability has been resolved: comedi: me_daq: Fix potential overrun of firmware buffer `me2600_xilinx_download()` loads the firmware that was requested by `request_firmware()`. It is possible for it to overrun the source buffer because it blindly trusts the file format. It reads a data stream length from the first 4 bytes into variable `file_length` and reads the data stream contents of length `file_length` from offset 16 onwards. Although it checks that the supplied firmware is at least 16 bytes long, it does not check that it is long enough to contain the data stream. Add a test to ensure that the supplied firmware is long enough to contain the header and the data stream. On failure, log an error and return `-EINVAL`.

Overview

State: PUBLISHED
Assigner (CNA): Linux
CVSS severity: high
CVSS score: 7.8 / 10
CVSS vector: AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Effective score: 7.8 / 10 HIGH source: CNA overview
CWE(s): —
Reserved: 2026-03-09
Published: 2026-05-01 16:14 UTC
Last updated: 2026-05-12 00:15 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/31xxx/CVE-2026-31748.json
Linked Threat: CVE-2026-31748 — CVE-2026-31748

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-05-01 15:16:37 UTC
NVD last modified: 2026-05-07 19:24:39 UTC
NVD CVSS v3.1: 7.8 / 10 HIGH source: nvd@nist.gov
NVD CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitability subscore: 1.8 / 10
Impact subscore: 5.9 / 10
EPSS score: 0.0001 (probability of exploitation in next 30 days)
EPSS percentile: 2.54% vs all CVEs — higher = more likely to be exploited, as of 2026-05-25

NVD-assigned CWE(s): CWE-787 (differs from the CNA list above)

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-26561
Assigner: Linux
Published: May 1, 2026, 2:14:41 PM
Updated: May 11, 2026, 10:15:00 PM
EUVD base score: 0.0 / 10
EUVD-reported EPSS: 0.0100
Vendors: Linux
Products: Linux (patch: 6.19.12)

Linux (patch: 6.6.134)

Linux (patch: 0)

Linux (85acac61096f946a78cf0c4b65f7cebe580693b6 <2fc25a4c2e055cd42ea39a1b42c89bfef70e0319)

Linux (patch: 5.15.203)

Linux (85acac61096f946a78cf0c4b65f7cebe580693b6 <c16ac4e173a05011437a2d868f70cc415339065a)

Linux (85acac61096f946a78cf0c4b65f7cebe580693b6 <9f39fa07259eb342908e4aa0271dee038a8ce4f8)

Linux (patch: 7.0)

Linux (patch: 5.10.253)

Linux (85acac61096f946a78cf0c4b65f7cebe580693b6 <c8c607a77aab783f2e38cc2e0f24aa6c8f6d200b)

Linux (patch: 6.1.168)

Linux (85acac61096f946a78cf0c4b65f7cebe580693b6 <f3f8ec00cfb8d8e826e30b1138a56355b88e9ba8)

Linux (patch: 6.12.81)

Linux (85acac61096f946a78cf0c4b65f7cebe580693b6 <1bf8761eb59e94bf7b8c17b2a1ee48f14378b172)

Linux (85acac61096f946a78cf0c4b65f7cebe580693b6 <a47ae40339c1048f519df33ff8840731720f57cb)

Linux (patch: 6.18.22)

Linux (85acac61096f946a78cf0c4b65f7cebe580693b6 <cc797d4821c754c701d9714b58bea947e31dbbe0)

Linux (2.6.29)

ENISA description: In the Linux kernel, the following vulnerability has been resolved: comedi: me_daq: Fix potential overrun of firmware buffer `me2600_xilinx_download()` loads the firmware that was requested by `request_firmware()`. It is possible for it to overrun the source buffer because it blindly trusts the file format. It reads a data stream length from the first 4 bytes into variable `file_length` and reads the data stream contents of length `file_length` from offset 16 onwards. Although it checks that the supplied firmware is at least 16 bytes long, it does not check that it is long enough to contain the data stream. Add a test to ensure that the supplied firmware is long enough to contain the header and the data stream. On failure, log an error and return `-EINVAL`.

EUVD references (8)

Affected products (2)

Vendor	Product	Versions	Platforms
Linux	Linux	`85acac61096f946a78cf0c4b65f7cebe580693b6` (affected), `85acac61096f946a78cf0c4b65f7cebe580693b6` (affected), `85acac61096f946a78cf0c4b65f7cebe580693b6` (affected), `85acac61096f946a78cf0c4b65f7cebe580693b6` (affected), `85acac61096f946a78cf0c4b65f7cebe580693b6` (affected), `85acac61096f946a78cf0c4b65f7cebe580693b6` (affected), `85acac61096f946a78cf0c4b65f7cebe580693b6` (affected), `85acac61096f946a78cf0c4b65f7cebe580693b6` (affected)	—
Linux	Linux	`2.6.29` (affected), `0` (unaffected), `5.10.253` (unaffected), `5.15.203` (unaffected), `6.1.168` (unaffected), `6.6.134` (unaffected), `6.12.81` (unaffected), `6.18.22` (unaffected), `6.19.12` (unaffected), `7.0` (unaffected)	—

Affected products — CPE 2.3 (7) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*

Vendor references (8)

References embedded in the original CVE record by the assigning CNA.

Web references (14)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

http://cwe.mitre.org/data/definitions/787.html rapid7:cwe.mitre.org
https://attackerkb.com/topics/CVE-2026-31748 rapid7:attackerkb.com
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-26561 rapid7:euvd.enisa.europa.eu
https://git.kernel.org/stable/c/1bf8761eb59e94bf7b8c17b2a1ee48f14378b172 tenable:git.kernel.org
https://git.kernel.org/stable/c/2fc25a4c2e055cd42ea39a1b42c89bfef70e0319 tenable:git.kernel.org
https://git.kernel.org/stable/c/9f39fa07259eb342908e4aa0271dee038a8ce4f8 tenable:git.kernel.org
https://git.kernel.org/stable/c/a47ae40339c1048f519df33ff8840731720f57cb tenable:git.kernel.org
https://git.kernel.org/stable/c/c16ac4e173a05011437a2d868f70cc415339065a tenable:git.kernel.org
https://git.kernel.org/stable/c/c8c607a77aab783f2e38cc2e0f24aa6c8f6d200b tenable:git.kernel.org
https://git.kernel.org/stable/c/cc797d4821c754c701d9714b58bea947e31dbbe0 tenable:git.kernel.org
https://git.kernel.org/stable/c/f3f8ec00cfb8d8e826e30b1138a56355b88e9ba8 tenable:git.kernel.org
https://nvd.nist.gov/vuln/detail/CVE-2026-31748 tenable:nvd.nist.gov
https://www.cve.org/CVERecord?id=CVE-2026-31748 tenable:www.cve.org
https://www.first.org/epss/ tenable:www.first.org

NVD-tagged references (8)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://git.kernel.org/stable/c/1bf8761eb59e94bf7b8c17b2a1ee48f14378b172 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/2fc25a4c2e055cd42ea39a1b42c89bfef70e0319 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/9f39fa07259eb342908e4aa0271dee038a8ce4f8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/a47ae40339c1048f519df33ff8840731720f57cb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/c16ac4e173a05011437a2d868f70cc415339065a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/c8c607a77aab783f2e38cc2e0f24aa6c8f6d200b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/cc797d4821c754c701d9714b58bea947e31dbbe0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/f3f8ec00cfb8d8e826e30b1138a56355b88e9ba8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch

Remediations (17)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

Microsoft Patch Tuesday April 2026 - 168 Vulnerabilities Fixed ...

web:cybersecuritynews.com

Microsoft has released its April 2026 Patch Tuesday security update, addressing 168 vulnerabilities across its product portfolio including one actively exploited zero-day and one publicly disclosed flaw that organizations must prioritize immediately.

2026-05-23 20:02 UTC
N-central third-party software patch list

web:documentation.n-able.com

For more information on how Patch Manager provides third-party patching, see Patching third-party software. Use the table's InstallerURLs location when configuring vendor and patch exclusions in your firewalls and other web-monitoring software.

2026-05-23 20:02 UTC
Patch Tuesday, May 2026 Edition - Krebs on Security

web:krebsonsecurity.com

Microsoft expects that exploitation is more likely. May's Patch Tuesday is a welcome respite from April, which saw Microsoft fix a near-record 167 security flaws.

2026-05-23 20:02 UTC
Nvd - Cve-2026-32748

web:nvd.nist.gov

An official website of the United States government Here's how you know

2026-05-23 20:02 UTC
Security Update Guide - Microsoft

web:portal.msrc.microsoft.com

The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

2026-05-23 20:02 UTC
SAP Security Patch Day - March 2026

web:support.sap.com

SAP security patch day bulletin

2026-05-23 20:02 UTC
April 2026 Patch Tuesday: Updates and Analysis | CrowdStrike

web:www.crowdstrike.com

Microsoft's April 2026 Patch Tuesday addresses 164 CVEs , featuring 8 Critical vulnerabilities, one exploited zero-day, and one disclosed zero-day.

2026-05-23 20:02 UTC
Oracle Critical Patch Update Advisory - April 2026

web:www.oracle.com

This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

2026-05-23 20:02 UTC
VirusTotal - Home

web:www.virustotal.com

VirusTotal is a platform for scanning files and URLs for viruses, malware, and other threats using multiple antivirus engines.

2026-05-23 20:02 UTC
Patch Tuesday May 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-05-23 20:02 UTC
Microsoft Patch Tuesday May 2026 - 120 Vulnerabilities Fixed, Including ...

web:cybersecuritynews.com

Microsoft's May 2026 Patch Tuesday lands with a heavy enterprise focus, fixing 120 vulnerabilities across Windows, Office, Azure, developer tools, and Microsoft 365 apps, including 29 remote code execution (RCE) flaws rated Critical.

2026-06-03 07:49 UTC
Security Update Guide - Microsoft

web:msrc.microsoft.com

The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.

2026-06-03 07:49 UTC
NVD - Home

web:nvd.nist.gov

The NVD is the U.S. government repository of standards based vulnerability management data represented using the Security Content Automation Protocol (SCAP). This data enables automation of vulnerability management, security measurement, and compliance. The NVD includes databases of security checklist references, security-related software flaws, product names, and impact metrics. For ...

2026-06-03 07:49 UTC
Microsoft Patch Tuesday security updates for March 2026 fixed 84 bugs

web:securityaffairs.com

Microsoft Patch Tuesday security updates for March 2026 addressed 84 vulnerabilities across its products. The IT giant addressed flaws across Windows, Office, Edge, Azure, SQL Server, Hyper-V, and ReFS. Including third-party and Chromium updates, the total reaches 94 vulnerabilities. Eight flaws are rated Critical and the rest Important.

2026-06-03 07:49 UTC
March 2026 Patch Tuesday: Updates and Analysis | CrowdStrike

web:www.crowdstrike.com

Microsoft's March 2026 Patch Tuesday addresses 82 CVEs , featuring eight Critical vulnerabilities.

2026-06-03 07:49 UTC
Microsoft Patch Tuesday - March 2026 - Lansweeper

web:www.lansweeper.com

The March 2026 edition of Patch Tuesday brings us 88 fixes, with 3 rated as critical. We've listed the most important changes below. Microsoft Excel Information Disclosure Vulnerability CVE - 2026 -26144 is a critical information disclosure flaw in Microsoft Excel caused by improper input neutralization during web page generation.

2026-06-03 07:49 UTC
Patch Tuesday - March 2026 - Rapid7

web:www.rapid7.com

Microsoft is publishing 77 vulnerabilities this Patch Tuesday, including two publicly disclosed zero-day vulnerabilities.

2026-06-03 07:49 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-31748.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/comedi/drivers/me_daq.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2fc25a4c2e055cd42ea39a1b42c89bfef70e0319",
              "status": "affected",
              "version": "85acac61096f946a78cf0c4b65f7cebe580693b6",
              "versionType": "git"
            },
            {
              "lessThan": "9f39fa07259eb342908e4aa0271dee038a8ce4f8",
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              "versionType": "git"
            },
            {
              "lessThan": "f3f8ec00cfb8d8e826e30b1138a56355b88e9ba8",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "c16ac4e173a05011437a2d868f70cc415339065a",
              "status": "affected",
              "version": "85acac61096f946a78cf0c4b65f7cebe580693b6",
              "versionType": "git"
            },
            {
              "lessThan": "1bf8761eb59e94bf7b8c17b2a1ee48f14378b172",
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              "versionType": "git"
            },
            {
              "lessThan": "a47ae40339c1048f519df33ff8840731720f57cb",
              "status": "affected",
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            },
            {
              "lessThan": "c8c607a77aab783f2e38cc2e0f24aa6c8f6d200b",
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              "versionType": "git"
            },
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/comedi/drivers/me_daq.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.29"
            },
            {
              "lessThan": "2.6.29",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.253",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.168",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.134",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.81",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.22",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.253",
                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "5.15.203",
                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.168",
                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.134",
                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.81",
                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.22",
                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.12",
                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: me_daq: Fix potential overrun of firmware buffer\n\n`me2600_xilinx_download()` loads the firmware that was requested by\n`request_firmware()`.  It is possible for it to overrun the source\nbuffer because it blindly trusts the file format.  It reads a data\nstream length from the first 4 bytes into variable `file_length` and\nreads the data stream contents of length `file_length` from offset 16\nonwards.  Although it checks that the supplied firmware is at least 16\nbytes long, it does not check that it is long enough to contain the data\nstream.\n\nAdd a test to ensure that the supplied firmware is long enough to\ncontain the header and the data stream.  On failure, log an error and\nreturn `-EINVAL`."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:15:00.272Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2fc25a4c2e055cd42ea39a1b42c89bfef70e0319"
        },
        {
          "url": "https://git.kernel.org/stable/c/9f39fa07259eb342908e4aa0271dee038a8ce4f8"
        },
        {
          "url": "https://git.kernel.org/stable/c/f3f8ec00cfb8d8e826e30b1138a56355b88e9ba8"
        },
        {
          "url": "https://git.kernel.org/stable/c/c16ac4e173a05011437a2d868f70cc415339065a"
        },
        {
          "url": "https://git.kernel.org/stable/c/1bf8761eb59e94bf7b8c17b2a1ee48f14378b172"
        },
        {
          "url": "https://git.kernel.org/stable/c/a47ae40339c1048f519df33ff8840731720f57cb"
        },
        {
          "url": "https://git.kernel.org/stable/c/c8c607a77aab783f2e38cc2e0f24aa6c8f6d200b"
        },
        {
          "url": "https://git.kernel.org/stable/c/cc797d4821c754c701d9714b58bea947e31dbbe0"
        }
      ],
      "title": "comedi: me_daq: Fix potential overrun of firmware buffer",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31748",
    "datePublished": "2026-05-01T14:14:41.545Z",
    "dateReserved": "2026-03-09T15:48:24.138Z",
    "dateUpdated": "2026-05-11T22:15:00.272Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}