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Expired Pointer Dereference The advisory has been revoked - it doesn't affect any version of package perf  (opens in a new tab)

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EPSS
0.12% (3rd percentile)

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  • Snyk IDSNYK-CENTOS6-PERF-16307561
  • published27 Apr 2026
  • disclosed25 Apr 2026
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Introduced: 25 Apr 2026

CVE-2026-31680  (opens in a new tab)
CWE-825  (opens in a new tab)

Amendment

The Centos security team deemed this advisory irrelevant for Centos:6.

NVD Description

Note: Versions mentioned in the description apply only to the upstream perf package and not the perf package as distributed by Centos.

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

net: ipv6: flowlabel: defer exclusive option free until RCU teardown

ip6fl_seq_show() walks the global flowlabel hash under the seq-file RCU read-side lock and prints fl->opt->opt_nflen when an option block is present.

Exclusive flowlabels currently free fl->opt as soon as fl->users drops to zero in fl_release(). However, the surrounding struct ip6_flowlabel remains visible in the global hash table until later garbage collection removes it and fl_free_rcu() finally tears it down.

A concurrent /proc/net/ip6_flowlabel reader can therefore race that early kfree() and dereference freed option state, triggering a crash in ip6fl_seq_show().

Fix this by keeping fl->opt alive until fl_free_rcu(). That matches the lifetime already required for the enclosing flowlabel while readers can still reach it under RCU.