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CVE-2026-45998

📛 CVE Title

rxrpc: Fix potential UAF after skb_unshare() failure

⬇ Download JSON ⚠ View as Threat

Description

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix potential UAF after skb_unshare() failure If skb_unshare() fails to unshare a packet due to allocation failure in rxrpc_input_packet(), the skb pointer in the parent (rxrpc_io_thread()) will be NULL'd out. This will likely cause the call to trace_rxrpc_rx_done() to oops. Fix this by moving the unsharing down to where rxrpc_input_call_event() calls rxrpc_input_call_packet(). There are a number of places prior to that where we ignore DATA packets for a variety of reasons (such as the call already being complete) for which an unshare is then avoided. And with that, rxrpc_input_packet() doesn't need to take a pointer to the pointer to the packet, so change that to just a pointer.

Overview

State
PUBLISHED
Assigner (CNA)
Linux
CVSS severity
high
CVSS score
CVSS 7.8 / 10 7.8 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
7.0 / 10 HIGH MS rating: Moderate
CWE(s)
—
Reserved
2026-05-13
Published
2026-05-27 12:55 UTC
Last updated
2026-05-27 12:55 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/45xxx/CVE-2026-45998.json
Linked Threat
CVE-2026-45998 — CVE-2026-45998

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 14:17:17 UTC
NVD last modified
2026-07-15 02:22:08 UTC
NVD CVSS v3.1
CVSS 7.8 / 10 7.8 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
0.0013 (probability of exploitation in next 30 days)
EPSS percentile
2.90% vs all CVEs — higher = more likely to be exploited, as of 2026-08-01

NVD-assigned CWE(s): CWE-416, CWE-825 (differs from the CNA list above)

NVD / KEV / EPSS data refreshed 2026-08-01 17:11 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.

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-2026-32294
Assigner
Linux
Published
May 27, 2026, 12:55:52 PM
Updated
Jul 15, 2026, 12:51:50 AM
EUVD base score (CVSS 3.1)
7.0 / 10
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EUVD-reported EPSS
0.1300
Vendors
Linux
Products
Linux (patch: 0)
Linux (2d1faf7a0ca3c0b327cf064c80e4e775532c9319 <996b0487b3cdda4c91811dbb1c9564626bc840bd)
Linux (patch: 6.12.86)
Linux (6.2)
Linux (2d1faf7a0ca3c0b327cf064c80e4e775532c9319 <bf20f46d94f1db38e6ffc0ca204a5fe0de01b495)
Linux (patch: 6.6.140)
Linux (patch: 7.0.4)
Linux (patch: 6.18.27)
Linux (2d1faf7a0ca3c0b327cf064c80e4e775532c9319 <e3bf143b1e98fb3d6d9e6825bcd683974d478e8c)
Linux (patch: 7.1)
Linux (2d1faf7a0ca3c0b327cf064c80e4e775532c9319 <8fde6296c4d4da2be7ab761305ab7f232b94eefd)
Linux (2d1faf7a0ca3c0b327cf064c80e4e775532c9319 <1f2740150f904bfa60e4bad74d65add3ccb5e7f8)
Aliases
GHSA-mjcm-hf7x-hm3w

ENISA description: In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix potential UAF after skb_unshare() failure If skb_unshare() fails to unshare a packet due to allocation failure in rxrpc_input_packet(), the skb pointer in the parent (rxrpc_io_thread()) will be NULL'd out. This will likely cause the call to trace_rxrpc_rx_done() to oops. Fix this by moving the unsharing down to where rxrpc_input_call_event() calls rxrpc_input_call_packet(). There are a number of places prior to that where we ignore DATA packets for a variety of reasons (such as the call already being complete) for which an unshare is then avoided. And with that, rxrpc_input_packet() doesn't need to take a pointer to the pointer to the packet, so change that to just a pointer.

EUVD references (5)

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 2026-08-12 01:09 UTC (source: CVRF).

MS severity
Moderate
MS CVSS base score
7.0 / 10 (temporal 6.4)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U
Release
2026-May
Microsoft remediations / KB articles (2)

Affected products (2)
VendorProductVersionsPlatforms
Linux Linux 2d1faf7a0ca3c0b327cf064c80e4e775532c9319 (affected), 2d1faf7a0ca3c0b327cf064c80e4e775532c9319 (affected), 2d1faf7a0ca3c0b327cf064c80e4e775532c9319 (affected), 2d1faf7a0ca3c0b327cf064c80e4e775532c9319 (affected), 2d1faf7a0ca3c0b327cf064c80e4e775532c9319 (affected) —
Linux Linux 6.2 (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.

NVD-tagged references (9)

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

Remediations (19)

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

  • CISA Warns of Exploited Microsoft Defender 0-Day Flaws
    web:cyberpress.org

    The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added two actively exploited Microsoft Defender vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog, issuing an urgent remediation directive for federal agencies with a due date of June 3, 2026 .

    2026-06-04 00:14 UTC
  • CISA Warns of Microsoft Defender 0-Day Vulnerabilities Exploited in Attacks
    web:cybersecuritynews.com

    CISA added two critical Microsoft Defender flaws to its KEV catalog, warning of active attacks that could escalate privileges.

    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
  • Microsoft Defender Vulnerabilities Added to CISA KEV (CVE-2026-41091 ...
    web:op-c.net

    CISA added two actively exploited Microsoft Defender vulnerabilities, CVE - 2026 -41091 and CVE - 2026 -45498, to its KEV catalog. Learn the risks and recommended actions.

    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
  • 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
  • Microsoft Technical Security Notifications
    web:www.microsoft.com

    Security Update Guide Notifications Microsoft's free Security Update Guide Notifications provide links to security-related software updates and notification of re-released security updates. These notifications are sent via email throughout the month as needed.

    2026-06-04 00:14 UTC
  • CISA just added two Microsoft Defender flaws to the actively ... - MSN
    web:www.msn.com

    Every federal civilian agency running Microsoft Defender now faces a two-week countdown to fix two actively exploited security flaws. CISA added CVE - 2026 -41091 and CVE - 2026 -45498 to its Known ...

    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
  • Nvd - Cve-2026-45498
    web:nvd.nist.gov

    An official website of the United States government NVD MENU

    2026-06-19 02:27 UTC
  • March 13, 2026—Hotpatch KB5084597 (OS Builds 26200.7982 and 26100.7982 ...
    web:support.microsoft.com

    The following summary outlines key issues addressed by this update. The bold text within the brackets indicates the item or area of the change. [Networking] Fixed: This update addresses a security issue in the Windows Routing and Remote Access Service (RRAS) management tool. If you connect to a malicious remote server, an attacker could disrupt the tool or run code on your device. For more ...

    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 patches two zero-day flaws in Defender - CSO Online
    web:www.csoonline.com

    Microsoft released emergency fixes for two zero-day vulnerabilities in the malware protection components of Microsoft Defender. The flaws allow local attackers to gain system-level privileges or ...

    2026-06-19 02:27 UTC
  • Microsoft Defender vulnerabilities exploited in the wild (CVE-2026 ...
    web:www.helpnetsecurity.com

    Attackers are actively exploiting two Microsoft Defender vulnerabilities ( CVE - 2026 -41091 and CVE - 2026 -45498), Microsoft acknowledged.

    2026-06-19 02:27 UTC
  • Microsoft says two Defender flaws are under active exploitation
    web:www.isec.news

    Microsoft said two Defender vulnerabilities, including one that could lead to SYSTEM privileges, are under active exploitation. CISA has added both flaws to its known exploited list and set a June 3 deadline for federal agencies.

    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
  • 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 .

    2026-06-19 02:27 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-45998.json.

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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/trace/events/rxrpc.h",
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            "net/rxrpc/skbuff.c"
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        }
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      "providerMetadata": {
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    "cveId": "CVE-2026-45998",
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    "dateReserved": "2026-05-13T15:03:33.091Z",
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