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CVE-2026-53391 (GCVE-0-2026-53391)

Vulnerability from cvelistv5 – Published: 2026-07-19 12:01 – Updated: 2026-08-17 04:50
VLAI
Title
NFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 6b7f3cf96364eaf597940cb5c68a682894829915 , < 76b94cbd32aacf36a641956385a852635c6802b9 (git)
Affected: 6b7f3cf96364eaf597940cb5c68a682894829915 , < c8e4e0c701d0192a2efb6df059c0f9e19678c23d (git)
Affected: 6b7f3cf96364eaf597940cb5c68a682894829915 , < 6c344fff2feff9d4d716d8e4ad40e9b5040ee5ea (git)
Affected: 6b7f3cf96364eaf597940cb5c68a682894829915 , < 427ab81a811dab4bca9d19f82eec5847ae42646e (git)
Affected: 6b7f3cf96364eaf597940cb5c68a682894829915 , < 012d37a568bfbb2c9686f03ade75560bc7139956 (git)
Affected: 6b7f3cf96364eaf597940cb5c68a682894829915 , < 30aae62e50b4e074a90a9a5e15246548fbdc1182 (git)
Affected: 6b7f3cf96364eaf597940cb5c68a682894829915 , < 41fe0f7b84f0cb822ae10ab08592996a592b2a25 (git)
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Linux Linux Affected: 4.0
Unaffected: 0 , < 4.0 (semver)
Unaffected: 5.15.211 , ≤ 5.15.* (semver)
Unaffected: 6.1.177 , ≤ 6.1.* (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.38 , ≤ 6.18.* (semver)
Unaffected: 7.1.3 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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    "redhat_vex": {
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      "current_release_date": "2026-09-04T08:03:14+00:00",
      "cve": "CVE-2026-53391",
      "id": "CVE-2026-53391",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:fixed": "762",
      "product_status:known_affected": "50",
      "product_status:known_not_affected": "15",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: NFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53391.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.