CVE-2026-64569: Linux kernel · mpls: fix NULL deref in mpls_valid_fib_dump_req() on CONFIG_INET=n
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 3 Nov 2026, 18:31 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 5 Aug 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 source to skip unset attributes in mpls_valid_fib_dump_req(), preventing the null pointer dereference. Users should apply the official kernel update containing this fix. No other mitigation steps are indicated or necessary.
Description
A null pointer dereference vulnerability exists in the Linux kernel's mpls_valid_fib_dump_req() function when built with CONFIG_INET=n. This occurs because the function accesses a netlink attribute without checking its presence, allowing an unprivileged user to trigger a kernel crash via RTM_GETROUTE messages for AF_MPLS. The issue has been fixed by skipping unset attributes as done in the related ip_valid_fib_dump_req() function.
References
- git.kernel.org/stable/c/bfc1cb5d6a8308e493e307f1c823d2107abc0a47 (opens in a new tab)
- git.kernel.org/stable/c/03b5a2c29afc8e634924c75d6ee94140e70de88d (opens in a new tab)
- git.kernel.org/stable/c/e796ce9ef4356dc7cbbaa8373843f77852f2814d (opens in a new tab)
- git.kernel.org/stable/c/d6eee7cd078aaf9dd75efc801f6c9b608a37cd71 (opens in a new tab)
- git.kernel.org/stable/c/ad6284ced6a15e4abd57ca4d0793b7bd15ca52ce (opens in a new tab)
- git.kernel.org/stable/c/5f6e7b32bd1fbde10fd31a4143260735ea535b8a (opens in a new tab)
- git.kernel.org/stable/c/06db79411a280707c7e4bf4b221ff4e664b51502 (opens in a new tab)
- git.kernel.org/stable/c/56d96fededd61192cd7cc8d2b0f36adfd59036c3 (opens in a new tab)