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VulnerabilityPublished Updated

CVE-2026-64538: Linux kernel · ipv6: Fix null-ptr-deref in fib6_nh_mtu_change().

Affects Linux kernelSource GCVE Database

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Not known to be exploited.

Data as of 3 Nov 2026, 18:32 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 27 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 3 Nov 2026.

What to do

AI-suggested

A fix has been applied in the Linux kernel source to add a NULL check in fib6_nh_mtu_change(), preventing the null pointer dereference. Users should update their Linux kernel to a version that includes this fix once available. Patch status is not explicitly confirmed in the provided data; check the official Linux kernel advisories for the fixed version and apply updates accordingly.

Description

A null pointer dereference vulnerability in the Linux kernel's IPv6 implementation was fixed in the function fib6_nh_mtu_change(). The issue arises because the function dereferences a pointer without checking for NULL, leading to a potential kernel oops (crash). This occurs during an MTU update walk triggered by router advertisement processing when certain network device pointers have been cleared. The fix adds a NULL check to prevent the dereference.

References

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