CVE-2026-53391NFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr
- 7.5HighCVSS base score
- 0.52%Exploitation in 30 daysEPSS · top 56% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 40 days later
· 40 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.52% · top 56% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
- affected 6b7f3cf96364eaf597940cb5c68a682894829915 – < 76b94cbd32aacf36a641956385a852635c6802b9
- affected 6b7f3cf96364eaf597940cb5c68a682894829915 – < c8e4e0c701d0192a2efb6df059c0f9e19678c23d
- affected 6b7f3cf96364eaf597940cb5c68a682894829915 – < 6c344fff2feff9d4d716d8e4ad40e9b5040ee5ea
- affected 6b7f3cf96364eaf597940cb5c68a682894829915 – < 427ab81a811dab4bca9d19f82eec5847ae42646e
- affected 6b7f3cf96364eaf597940cb5c68a682894829915 – < 012d37a568bfbb2c9686f03ade75560bc7139956
- affected 6b7f3cf96364eaf597940cb5c68a682894829915 – < 30aae62e50b4e074a90a9a5e15246548fbdc1182
- affected 6b7f3cf96364eaf597940cb5c68a682894829915 – < 41fe0f7b84f0cb822ae10ab08592996a592b2a25
- affected 4.0
- unaffected < 4.0
- unaffected 5.15.211 – ≤ 5.15.*
- unaffected 6.1.177 – ≤ 6.1.*
- unaffected 6.6.144 – ≤ 6.6.*
- unaffected 6.12.95 – ≤ 6.12.*
- unaffected 6.18.38 – ≤ 6.18.*
- unaffected 7.1.3 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References7
- https://git.kernel.org/stable/c/76b94cbd32aacf36a641956385a852635c6802b9 (opens in a new tab)
- https://git.kernel.org/stable/c/c8e4e0c701d0192a2efb6df059c0f9e19678c23d (opens in a new tab)
- https://git.kernel.org/stable/c/6c344fff2feff9d4d716d8e4ad40e9b5040ee5ea (opens in a new tab)
- https://git.kernel.org/stable/c/427ab81a811dab4bca9d19f82eec5847ae42646e (opens in a new tab)
- https://git.kernel.org/stable/c/012d37a568bfbb2c9686f03ade75560bc7139956 (opens in a new tab)
- https://git.kernel.org/stable/c/30aae62e50b4e074a90a9a5e15246548fbdc1182 (opens in a new tab)
- https://git.kernel.org/stable/c/41fe0f7b84f0cb822ae10ab08592996a592b2a25 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-45513 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-53391)Record last updated .