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Findings

CVE-2026-31680

In the Linux kernel, the following vulnerability has been resolved: net: ipv6: flowlabel: defer exclusive option free until RCU teardown walks the global flowlabel has…

Published Apr 25, 2026 · updated Oct 15, 2026 · linux linux kernel

In the Linux kernel, the following vulnerability has been resolved: net: ipv6: flowlabel: defer exclusive option free until RCU teardown walks the global flowlabel hash under the seq-file RCU read-side lock and prints when an option block is present. Exclusive flowlabels currently free as soon as drops to zero in . However, the surrounding remains visible in the global hash table until later garbage collection removes it and finally tears it down. A concurrent reader can therefore race that early and dereference freed option state, triggering a crash in . Fix this by keeping alive until . That matches the lifetime already required for the enclosing flowlabel while readers can still reach it under RCU.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 25, 2026 · NIST NVD

    Detected

    In the Linux kernel, the following vulnerability has been resolved: net: ipv6: flowlabel: defer exclusive option free until RCU teardown walks the global flowlabel hash under the seq-file RCU read-side lock and prints when an option block is present. Exclusive flowlabels currently free as soon as drops to zero in . However, the surrounding remains visible in the global hash table until later garba

  2. Oct 15, 2026 · NIST NVD

    Updated

    In the Linux kernel, the following vulnerability has been resolved: net: ipv6: flowlabel: defer exclusive option free until RCU teardown walks the global flowlabel hash under the seq-file RCU read-side lock and prints when an option block is present. Exclusive flowlabels currently free as soon as drops to zero in . However, the surrounding remains visible in the global hash table until later garba

Affected

  • cpe linux/linux kernelversion unspecified
  • cpe linux/linux kernel7.0

Sources

  • CVE.orgVulnerability recordCVE-2026-31680

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-31680

    30-day exploitation probability 0.2%

    first.org
  • NIST NVDVulnerability recordCVE-2026-31680

    In the Linux kernel, the following vulnerability has been resolved: net: ipv6: flowlabel: defer exclusive option free until RCU teardown walks the global flowlabel hash under the seq-file RCU read-side lock and prints when an option block

    nvd.nist.gov

References