Access of Uninitialized Pointer Affecting perf6.18-debuginfo package, versions <1:6.18.25-52.107.amzn2023


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.34% (26th percentile)

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  • Snyk IDSNYK-AMZN2023-PERF618DEBUGINFO-16886198
  • published27 May 2026
  • disclosed22 Apr 2026

Introduced: 22 Apr 2026

CVE-2026-31435  (opens in a new tab)
CWE-824  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 perf6.18-debuginfo to version 1:6.18.25-52.107.amzn2023 or higher.
This issue was patched in ALAS2023-2026-1746.

NVD Description

Note: Versions mentioned in the description apply only to the upstream perf6.18-debuginfo package and not the perf6.18-debuginfo package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

netfs: Fix read abandonment during retry

Under certain circumstances, all the remaining subrequests from a read request will get abandoned during retry. The abandonment process expects the 'subreq' variable to be set to the place to start abandonment from, but it doesn't always have a useful value (it will be uninitialised on the first pass through the loop and it may point to a deleted subrequest on later passes).

Fix the first jump to "abandon:" to set subreq to the start of the first subrequest expected to need retry (which, in this abandonment case, turned out unexpectedly to no longer have NEED_RETRY set).

Also clear the subreq pointer after discarding superfluous retryable subrequests to cause an oops if we do try to access it.

CVSS Base Scores

version 3.1