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Back to active CVEs
Unknown severity · Source severity not reportedCVE-2026-98394

af_unix: Return immediately when manage_oob() returns NULL for 0-length buffer.CVE-2026-98394

Answer in brief

CVE-2026-98394 records a Unknown severity vulnerability in af_unix: Return immediately when manage_oob() returns NULL for 0-length buffer.. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 14, 2026Updated Oct 19, 2026Source checked Oct 25, 2026First seen by HOL Oct 14, 2026Material review Oct 19, 2026
Upstream Advisory

Key facts

Risk
Unknown severitySource severity not reported
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=314001f0bf927015e459c9d387d62a231fe93af3 <3d3c7a3df66b2ca3d2cd1a2a0c37eb701feba713 || >=314001f0bf927015e459c9d387d62a231fe93af3 <d5dd55b316ca229a4cbf11729483ba5bb57233e7 || >=314001f0bf927015e459c9d387d62a231fe93af3 <c81c5be3826c8467945b964d0cf7f7b3d65461db || >=314001f0bf927015e459c9d387d62a231fe93af3 <6e5ee08eb5858d175da6768d75d163817b6a9d4a3d3c7a3df66b2ca3d2cd1a2a0c37eb701feba713, d5dd55b316ca229a4cbf11729483ba5bb57233e7, c81c5be3826c8467945b964d0cf7f7b3d65461db, 6e5ee08eb5858d175da6768d75d163817b6a9d4a
Linux/Linuxgeneric5.15Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to 3d3c7a3df66b2ca3d2cd1a2a0c37eb701feba713 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 14, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 19, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 14, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source description

In the Linux kernel, the following vulnerability has been resolved: af_unix: Return immediately when manage_oob() returns NULL for 0-length buffer. Fahad Alharbi reported that recv(0, MSG_PEEK) triggers busy-wait in unix_stream_read_generic() if recv() is blocking and the last skb in the queue is MSG_OOB skb. In such a situation, TCP returns 0 immediately regardless of blocking or non-blocking. Let's follow the behaviour.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Oct 25, 2026
References
4 linked sources
Open source record