CVE-2026-45860 Affecting libperf package, versions <0:6.12.0-211.63.1.el10_2


Severity

Recommended
high

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.7% (52nd percentile)

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  • Snyk IDSNYK-ALMALINUX10-LIBPERF-20932191
  • published14 Oct 2026
  • disclosed6 Oct 2026

Introduced: 6 Oct 2026

NewCVE-2026-45860  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:10 libperf to version 0:6.12.0-211.63.1.el10_2 or higher.
This issue was patched in ALSA-2026:76738.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libperf package and not the libperf package as distributed by AlmaLinux. See How to fix? for AlmaLinux:10 relevant fixed versions and status.

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

netfilter: nf_conncount: increase the connection clean up limit to 64

After the optimization to only perform one GC per jiffy, a new problem was introduced. If more than 8 new connections are tracked per jiffy the list won't be cleaned up fast enough possibly reaching the limit wrongly.

In order to prevent this issue, only skip the GC if it was already triggered during the same jiffy and the increment is lower than the clean up limit. In addition, increase the clean up limit to 64 connections to avoid triggering GC too often and do more effective GCs.

This has been tested using a HTTP server and several performance tools while having nft_connlimit/xt_connlimit or OVS limit configured.

Output of slowhttptest + OVS limit at 52000 connections:

slow HTTP test status on 340th second: initializing: 0 pending: 432 connected: 51998 error: 0 closed: 0 service available: YES

CVSS Base Scores

version 3.1