CVE-2026-53391 (GCVE-0-2026-53391)
Vulnerability from cvelistv5 – Published: 2026-07-19 12:01 – Updated: 2026-08-17 04:50
VLAI
EPSS
VEX
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)
Assigner
References
7 references
Impacted products
2 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) |
guessed | |
| 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) |
guessed |
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"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"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"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-16T00:10:42Z",
"cve": "CVE-2026-53391",
"id": "CVE-2026-53391",
"initial_release_date": "2026-07-19T17:36:05Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "431",
"product_status:known_not_affected": "93",
"product_status:recommended": "572",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-53391",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53391.json",
"version": "24"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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