Double Free Affecting perf package, versions <0:4.18.0-553.147.1.el8_10


Severity

Recommended
high

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.37% (30th percentile)

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  • Snyk IDSNYK-ALMALINUX8-PERF-18302901
  • published25 Jul 2026
  • disclosed31 Jul 2026

Introduced: 25 Jul 2026

NewCVE-2026-52993  (opens in a new tab)
CWE-415  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:8 perf to version 0:4.18.0-553.147.1.el8_10 or higher.
This issue was patched in ALSA-2026:45115.

NVD Description

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

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

tipc: fix double-free in tipc_buf_append()

tipc_msg_validate() can potentially reallocate the skb it is validating, freeing the old one. In tipc_buf_append(), it was being called with a pointer to a local variable which was a copy of the caller's skb pointer.

If the skb was reallocated and validation subsequently failed, the error handling path would free the original skb pointer, which had already been freed, leading to double-free.

Fix this by checking if head now points to a newly allocated reassembled skb. If it does, reassign *headbuf for later freeing operations.

CVSS Base Scores

version 3.1