CVE-2026-53391
CVE CVE-2026-53391EUVD EUVD-2026-45513Published 2026-07-19T12:01:55.000ZLast changed 2026-08-05T12:35:31.000ZCVSS 7.5
What the advisory describes
In the Linux kernel, the following vulnerability has been resolved: NFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr nfs4_decode_mp_ds_addr() decodes the r_netid and r_addr opaques of a netaddr4 from a GETDEVICEINFO multipath-DS body, then immediately calls strrchr(buf, '.') to locate the port separator. Both decodes use xdr_stream_decode_string_dup(), and the current code checks only "nlen < 0" / "rlen < 0" before dereferencing the returned string. When the on-wire opaque has length zero, xdr_stream_decode_opaque_inline() returns 0 and xdr_stream_decode_string_dup() falls through to its "*str = NULL; return ret" tail, leaving buf NULL with a return value of 0. The "< 0" check does not catch this, and the next line is strrchr(NULL, '.'), a kernel NULL pointer dereference reachable from any pNFS-flexfile client mounted against a malicious or compromised metadata server. Reject the zero-length cases explicitly so the decoder fails with -EBADMSG (treated as a malformed GETDEVICEINFO body) instead of panicking the client.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux 6b7f3cf96364eaf597940cb5c68a682894829915 <012d37a568bfbb2c9686f03ade75560bc7139956; patch: 7.1.3; patch: 6.12.95; patch: 6.6.144; 6b7f3cf96364eaf597940cb5c68a682894829915 <30aae62e50b4e074a90a9a5e15246548fbdc1182; patch: 7.2-rc1; 6b7f3cf96364eaf597940cb5c68a682894829915 <76b94cbd32aacf36a641956385a852635c6802b9; patch: 5.15.211; 4.0; 6b7f3cf96364eaf597940cb5c68a682894829915 <427ab81a811dab4bca9d19f82eec5847ae42646e; patch: 6.18.38; 6b7f3cf96364eaf597940cb5c68a682894829915 <41fe0f7b84f0cb822ae10ab08592996a592b2a25; 6b7f3cf96364eaf597940cb5c68a682894829915 <c8e4e0c701d0192a2efb6df059c0f9e19678c23d; patch: 6.1.177; 6b7f3cf96364eaf597940cb5c68a682894829915 <6c344fff2feff9d4d716d8e4ad40e9b5040ee5ea; patch: 0
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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