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VulnerabilityPublished Updated

CVE-2026-64542: Linux kernel · ipv6: ndisc: fix NULL deref in accept_untracked_na()

Affects Linux kernelSource GCVE Database

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Not known to be exploited.

Data as of 3 Nov 2026, 18:32 UTC

Severity
High

Rated High 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 implemented in the Linux kernel to address this issue by modifying the code to use the caller's already validated inet6_dev pointer instead of re-fetching it. Users should apply the official Linux kernel updates that include this fix once available. No other specific mitigations are indicated.

Description

A null pointer dereference vulnerability was fixed in the Linux kernel's IPv6 Neighbor Discovery Protocol (ndisc) code. The flaw occurs in the accept_untracked_na() function, which re-fetches a network device structure without a proper NULL check, leading to a potential kernel crash. This issue can be triggered by an unprivileged user in a network namespace environment.

References

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