PT-2026-39124 · Linux · Linux Kernel

Published 2026-05-08 · Updated 2026-05-20 · CVE-2026-43463

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the rxrpc and afs components where the rxrpc kernel lookup peer() function can return error pointers in addition to NULL. The system failed to properly check for these error pointers, as it only verified if the return value was NULL.

Recommendations Update the Linux kernel to a version where rxrpc kernel lookup peer() returns -ENOMEM on allocation failure and callers in afs utilize IS ERR() and PTR ERR() to handle the returned error codes.

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-43463

Affected Products

Linux Kernel

References · 15

• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43463 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-43463 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43463 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-43463 · Security Note
• https://ubuntu.com/security/CVE-2026-43463 · Vendor Advisory
• https://git.kernel.org/stable/c/54331c5dcc6d97683d7ca2788e7ef9c9505e1477 · Patch
• https://git.kernel.org/stable/c/4245a79003adf30e67f8e9060915bd05cb31d142 · Patch
• https://git.kernel.org/stable/c/d55fa7cd4b19ba91b34b307d769c149e56ad0a75 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-43463 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-43463 · Vendor Advisory
• https://docs.bell-sw.com/security/cves/CVE-2026-43463 · Note
• https://twitter.com/CVEnew/status/2052767599830917472 · Twitter Post
• https://git.kernel.org/linus/4245a79003adf30e67f8e9060915bd05cb31d142 · Note
• https://t.me/cveNotify/164284 · Telegram Post
• https://twitter.com/hetmehtaa/status/2055151398283837677 · Twitter Post