Race Condition Affecting perf package, versions <0:4.18.0-553.126.1.el8_10


Severity

Recommended
high

Based on Rocky Linux security rating.

Threat Intelligence

EPSS
0.09% (1st percentile)

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  • Snyk IDSNYK-ROCKY8-PERF-17116125
  • published1 Jun 2026
  • disclosed6 May 2026

Introduced: 6 May 2026

CVE-2026-43163  (opens in a new tab)
CWE-362  (opens in a new tab)

How to fix?

Upgrade Rocky-Linux:8 perf to version 0:4.18.0-553.126.1.el8_10 or higher.
This issue was patched in RLSA-2026:21706.

NVD Description

Note: Versions mentioned in the description apply only to the upstream perf package and not the perf package as distributed by Rocky-Linux. See How to fix? for Rocky-Linux:8 relevant fixed versions and status.

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

md/bitmap: fix GPF in write_page caused by resize race

A General Protection Fault occurs in write_page() during array resize: RIP: 0010:write_page+0x22b/0x3c0 [md_mod]

This is a use-after-free race between bitmap_daemon_work() and __bitmap_resize(). The daemon iterates over bitmap-&gt;storage.filemap without locking, while the resize path frees that storage via md_bitmap_file_unmap(). quiesce() does not stop the md thread, allowing concurrent access to freed pages.

Fix by holding mddev-&gt;bitmap_info.mutex during the bitmap update.

CVSS Base Scores

version 3.1