CVE-2026-64542: Linux kernel · ipv6: ndisc: fix NULL deref in accept_untracked_na()
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 3 Nov 2026, 18:32 UTC
Rated High by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 27 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
- git.kernel.org/stable/c/e5ba3017e46f275ad347e762e8eecacec5efa41d (opens in a new tab)
- git.kernel.org/stable/c/160d3f0d7a556ceae505dcab521a37057b4ce28f (opens in a new tab)
- git.kernel.org/stable/c/62c719203cb521b64fab74da94a81bdde5c18808 (opens in a new tab)
- git.kernel.org/stable/c/a6450f7cfae57b382cbaf66a577765c9a88b3c58 (opens in a new tab)
- git.kernel.org/stable/c/63d1c23764de2309cedbb779c75188d257a09d9b (opens in a new tab)
- git.kernel.org/stable/c/d186e942365acece7c56d39da05dd63bf95b280a (opens in a new tab)