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Back to active CVEs
Critical · CVSS 9.8CVE-2025-37879

9p/net: fix improper handling of bogus negative read/write repliesCVE-2025-37879

Answer in brief

CVE-2025-37879 records a Critical severity (CVSS 9.8) vulnerability in 9p/net: fix improper handling of bogus negative read/write replies. 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 May 9, 2025Updated Aug 5, 2026Source checked Nov 4, 2026First seen by HOL Aug 5, 2026Material review Aug 5, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.8
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 9.8. 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>=070b3656cf228eaaef7b28b59264c5c7cdbdd0fb <468ff4a7c61fb811c596a7c44b6a5455e40fd12b || >=070b3656cf228eaaef7b28b59264c5c7cdbdd0fb <a68768e280b7d0c967ea509e791bb9b90adc94a5 || >=070b3656cf228eaaef7b28b59264c5c7cdbdd0fb <c548f95688e2b5ae0e2ae43d53cf717156c7d034 || >=070b3656cf228eaaef7b28b59264c5c7cdbdd0fb <374e4cd75617c8c2552f562f39dd989583f5c330 || >=070b3656cf228eaaef7b28b59264c5c7cdbdd0fb <d0259a856afca31d699b706ed5e2adf11086c73b468ff4a7c61fb811c596a7c44b6a5455e40fd12b, a68768e280b7d0c967ea509e791bb9b90adc94a5, c548f95688e2b5ae0e2ae43d53cf717156c7d034, 374e4cd75617c8c2552f562f39dd989583f5c330, d0259a856afca31d699b706ed5e2adf11086c73b
Linux/Linuxgeneric4.1Not 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 468ff4a7c61fb811c596a7c44b6a5455e40fd12b if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    May 9, 2025

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

  2. Source modified

    Aug 5, 2026

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

  3. First seen by HOL

    Aug 5, 2026

Sources and claim methodology

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

In the Linux kernel, the following vulnerability has been resolved: 9p/net: fix improper handling of bogus negative read/write replies In p9_client_write() and p9_client_read_once(), if the server incorrectly replies with success but a negative write/read count then we would consider written (negative) <= rsize (positive) because both variables were signed. Make variables unsigned to avoid this problem. The reproducer linked below now fails with the following error instead of a null pointer deref: 9pnet: bogus RWRITE count (4294967295 > 3)

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
Nov 4, 2026
References
6 linked sources
Open source record