CVE-2026-45993

Description

In the Linux kernel, the following vulnerability has been resolved: LoongArch: Add spectre boundry for syscall dispatch table The LoongArch syscall number is directly controlled by userspace, but does not have a array_index_nospec() boundry to prevent access past the syscall function pointer tables.

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
MSRC score: 7.3 / 10 HIGH MS rating: Moderate
CWE(s): —
Reserved: 2026-05-13
Published: 2026-05-27 12:55 UTC
Last updated: 2026-05-30 10:41 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/45xxx/CVE-2026-45993.json
Linked Threat: CVE-2026-45993 — CVE-2026-45993

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: 2026-05-27 14:17:16 UTC
NVD last modified: 2026-06-19 13:16:31 UTC
NVD CVSS v3.1: 5.5 / 10 MEDIUM source: nvd@nist.gov
NVD CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Exploitability subscore: 1.8 / 10
Impact subscore: 3.6 / 10
EPSS score: 0.0014 (probability of exploitation in next 30 days)
EPSS percentile: 3.97% vs all CVEs — higher = more likely to be exploited, as of 2026-08-01

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-2026-32289
Assigner: Linux
Published: May 27, 2026, 12:55:46 PM
Updated: Jun 19, 2026, 11:58:50 AM
EUVD base score: 0.0 / 10
EUVD-reported EPSS: 0.1400
Vendors: Linux
Products: Linux (be769645a2aef577f07afdcb4de8fad20b6d57c0 <c8a8e863928424046b8fd328f02c359baa0a0c3f)

Linux (patch: 7.1)

Linux (5.19)

Linux (patch: 0)

Linux (be769645a2aef577f07afdcb4de8fad20b6d57c0 <bc84a109c2082dd0c4b38e8d923c046b41977533)

Linux (be769645a2aef577f07afdcb4de8fad20b6d57c0 <108f2cd13577a410c0ad6ea00708596d9d0dfc90)

Linux (patch: 6.18.27)

Linux (patch: 6.12.86)

Linux (patch: 6.1.176)

Linux (be769645a2aef577f07afdcb4de8fad20b6d57c0 <85cbf7fb568af5358aae61925c4e66b8f5e1439d)

Linux (patch: 7.0.4)

Linux (be769645a2aef577f07afdcb4de8fad20b6d57c0 <0c965d2784fbbd7f8e3b96d875c9cfdf7c00da3d)

Linux (patch: 6.6.140)

Linux (be769645a2aef577f07afdcb4de8fad20b6d57c0 <07040904ad217545be096d4280ed33c02f6a3750)
Aliases: GHSA-r2fv-v53q-68f3

ENISA description: In the Linux kernel, the following vulnerability has been resolved: LoongArch: Add spectre boundry for syscall dispatch table The LoongArch syscall number is directly controlled by userspace, but does not have a array_index_nospec() boundry to prevent access past the syscall function pointer tables.

EUVD references (6)

Microsoft Security Response Center MSRC

Microsoft's vendor-authoritative record from the Security Update Guide — its own CVSS score, impact, severity rating, exploit assessment, and KB-article fixes. Refreshed 2026-08-15 03:01 UTC (source: CVRF).

MS severity: Moderate
MS CVSS base score: 7.3 / 10 (temporal 6.7)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H/E:U
Release: 2026-May

Microsoft remediations / KB articles (2)

CBL-Mariner Releases — Vendor Fix / Security Update (fixed build 6.6.141.1-1)
https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade — None Available / CBL-Mariner Releases

Affected products (2)

Vendor	Product	Versions	Platforms
Linux	Linux	`be769645a2aef577f07afdcb4de8fad20b6d57c0` (affected), `be769645a2aef577f07afdcb4de8fad20b6d57c0` (affected), `be769645a2aef577f07afdcb4de8fad20b6d57c0` (affected), `be769645a2aef577f07afdcb4de8fad20b6d57c0` (affected), `be769645a2aef577f07afdcb4de8fad20b6d57c0` (affected)	—
Linux	Linux	`5.19` (affected), `0` (unaffected), `6.6.140` (unaffected), `6.12.86` (unaffected), `6.18.27` (unaffected), `7.0.4` (unaffected), `7.1-rc1` (unaffected)	—

Affected products — CPE 2.3 (1) 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:*:*:*:*:*:*:*:*

Vendor references (5)

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

Web references (10)

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

MSRC update guide: CVE-2026-45993 msrc
None Available msrc
https://git.kernel.org/stable/c/108f2cd13577a410c0ad6ea00708596d9d0dfc90 tenable:git.kernel.org
https://git.kernel.org/stable/c/85cbf7fb568af5358aae61925c4e66b8f5e1439d tenable:git.kernel.org
https://git.kernel.org/stable/c/bc84a109c2082dd0c4b38e8d923c046b41977533 tenable:git.kernel.org
https://nvd.nist.gov/vuln/detail/CVE-2026-45993 tenable:nvd.nist.gov
https://www.cve.org/CVERecord?id=CVE-2026-45993 tenable:www.cve.org
https://git.kernel.org/stable/c/07040904ad217545be096d4280ed33c02f6a3750 tenable:git.kernel.org
https://www.first.org/epss/ tenable:www.first.org
https://git.kernel.org/stable/c/0c965d2784fbbd7f8e3b96d875c9cfdf7c00da3d tenable:git.kernel.org

NVD-tagged references (6)

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/07040904ad217545be096d4280ed33c02f6a3750 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/0c965d2784fbbd7f8e3b96d875c9cfdf7c00da3d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/108f2cd13577a410c0ad6ea00708596d9d0dfc90 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/85cbf7fb568af5358aae61925c4e66b8f5e1439d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/bc84a109c2082dd0c4b38e8d923c046b41977533 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/c8a8e863928424046b8fd328f02c359baa0a0c3f 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Remediations (16)

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

Microsoft and Adobe Patch Tuesday, May 2026 Security Update Review

web:blog.qualys.com

May 2026's Patch Tuesday arrives with Microsoft addressing a fresh set of vulnerabilities across its ecosystem, reinforcing the ongoing need for timely patching in an increasingly threat-heavy…

2026-06-04 00:14 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.

2026-06-04 00:14 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.

2026-06-04 00:14 UTC
Android Security Bulletin—November 2025 - Android Open Source Project

web:source.android.com

Security patch levels of 2025-11-01 or later address all of these issues. To learn how to check a device's security patch level, see Check and update your Android version. Within 48 hours after the initial publication of this bulletin, we will release the corresponding source code patches to the Android Open Source Project (AOSP) repository.

2026-06-04 00:14 UTC
January 24, 2026—KB5078127 (OS Builds 26200.7628 and 26100.7628) Out-of ...

web:support.microsoft.com

It includes updates from previous security and non-security releases, along with an additional fix . To learn more about differences between security updates, optional non-security preview updates, out-of-band (OOB) updates, and continuous innovation, see Windows monthly updates explained.

2026-06-04 00:14 UTC
Landing Page | ServiceNow Common Vulnerabilities & Exposures (CVE ...

web:support.servicenow.com

Overview The advisories below document publicly disclosed Common Vulnerabilities and Exposures ( CVEs ) in the Now Platform by ServiceNow. Because ServiceNow uses various methods to communicate vulnerability information, patches, and other fixes, customers should review family, security patch , and hotfix release notes, which are available at https://docs.servicenow.com, for a complete list of ...

2026-06-04 00:14 UTC
Microsoft Defender vulnerabilities are being exploited in the wild

web:www.malwarebytes.com

The KEV catalog tracks vulnerabilities known to be exploited in the wild and sets patch deadlines for Federal Civilian Executive Branch (FCEB) agencies. Five of the added vulnerabilities are quite old by vulnerability standards. Patches were released in 2008, 2009, and 2010. But the Microsoft Defender vulnerabilities are from this year. Those ...

2026-06-04 00:14 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.

2026-06-04 00:14 UTC
Oracle Critical Patch Update Advisory - January 2026

web:www.oracle.com

Oracle Critical Patch Update Advisory - January 2026 Description A Critical Patch Update is a collection of patches for multiple security vulnerabilities. These patches address vulnerabilities in Oracle code and in third party components included in Oracle products. These patches are usually cumulative, but each advisory describes only the security patches added since the previous Critical ...

2026-06-04 00:14 UTC
Patch Tuesday June 2026: Security Updates & CVE Analysis

web:zecurit.com

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

2026-06-04 00:14 UTC
Microsoft Confirms Defender RoguePlanet 0-Day Exploit and Working to ...

web:cybersecuritynews.com

Microsoft has officially acknowledged a critical zero-day vulnerability in Microsoft Defender, publicly dubbed "RoguePlanet," and confirmed it is actively developing a security patch to address the flaw.

2026-06-19 02:27 UTC
June 9, 2026—KB5094123 (OS Build 17763.8880) - Microsoft Support

web:support.microsoft.com

Applies to: Windows Server 2019 This security update includes fixes and quality improvements that are part of the following update: May 12, 2026—KB5087538 (OS Build 17763.8755) The following is a summary of the issues that this update addresses when you install this update. The bold text within the brackets indicates the item or area of the change we are documenting. [Secure Boot] This ...

2026-06-19 02:27 UTC
Microsoft Patches 59 Vulnerabilities Including Six Actively Exploited ...

web:thehackernews.com

Microsoft patches 59 vulnerabilities, including six actively exploited zero-days, with CISA mandating urgent federal remediation .

2026-06-19 02:27 UTC
Microsoft is working on a patch for 'YellowKey ... - Computerworld

web:www.computerworld.com

Microsoft says it is considering a patch for a zero-day vulnerability, dubbed YellowKey, that allows attackers with access to a Windows device to bypass Bitlocker encryption protection and read ...

2026-06-19 02:27 UTC
Microsoft working on a fix for RoguePlanet, a flaw that grants full PC ...

web:www.malwarebytes.com

Microsoft says it's working on a fix for an unpatched Defender vulnerability that can give attackers the highest level of access on Windows.

2026-06-19 02:27 UTC
Patch Tuesday - June 2026 - Rapid7

web:www.rapid7.com

Microsoft is publishing 200 vulnerabilities on June 2026 Patch Tuesday, including an HTTP/2 denial of service vulnerability and an elevation of privilege vulnerability in PowerToys.

2026-06-19 02:27 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-45993.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/loongarch/kernel/syscall.c"
          ],
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          "vendor": "Linux",
          "versions": [
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            },
            {
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            {
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          "vendor": "Linux",
          "versions": [
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            },
            {
              "lessThan": "5.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.6.140",
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            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.86",
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            },
            {
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              "status": "unaffected",
              "version": "6.18.27",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
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              "negate": false,
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: Add spectre boundry for syscall dispatch table\n\nThe LoongArch syscall number is directly controlled by userspace, but\ndoes not have a array_index_nospec() boundry to prevent access past the\nsyscall function pointer tables."
        }
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      "providerMetadata": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "cveId": "CVE-2026-45993",
    "datePublished": "2026-05-27T12:55:46.480Z",
    "dateReserved": "2026-05-13T15:03:33.091Z",
    "dateUpdated": "2026-05-30T10:41:55.052Z",
    "state": "PUBLISHED"
  },
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}