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Back to active CVEs
High · CVSS 7.3CVE-2025-21789

LoongArch: csum: Fix OoB access in IP checksum code for negative lengthsCVE-2025-21789

Answer in brief

CVE-2025-21789 records a High severity (CVSS 7.3) vulnerability in LoongArch: csum: Fix OoB access in IP checksum code for negative lengths. 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 Feb 27, 2025Updated Aug 5, 2026Source checked Nov 4, 2026First seen by HOL Aug 5, 2026Material review Aug 5, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.3
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.3. 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>=69e3a6aa6be21de6aaf38130fad97ecde34a193c <964a8895704a22efc06a2a3276b624a5ae985a06 || >=69e3a6aa6be21de6aaf38130fad97ecde34a193c <9f15a8df542c0f08732a67d1a14ee7c22948fb97 || >=69e3a6aa6be21de6aaf38130fad97ecde34a193c <d6508ffff32b44b6d0de06704034e4eef1c307a7 || >=69e3a6aa6be21de6aaf38130fad97ecde34a193c <6287f1a8c16138c2ec750953e35039634018c84a964a8895704a22efc06a2a3276b624a5ae985a06, 9f15a8df542c0f08732a67d1a14ee7c22948fb97, d6508ffff32b44b6d0de06704034e4eef1c307a7, 6287f1a8c16138c2ec750953e35039634018c84a
Linux/Linuxgeneric6.4Not 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 964a8895704a22efc06a2a3276b624a5ae985a06 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Feb 27, 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
Upstream source description

In the Linux kernel, the following vulnerability has been resolved: LoongArch: csum: Fix OoB access in IP checksum code for negative lengths Commit 69e3a6aa6be2 ("LoongArch: Add checksum optimization for 64-bit system") would cause an undefined shift and an out-of-bounds read. Commit 8bd795fedb84 ("arm64: csum: Fix OoB access in IP checksum code for negative lengths") fixes the same issue on ARM64.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Buffer Overflow
EPSS
Not reported
CWE IDs
CWE-125
Source
CVE List V5
Source checked
Nov 4, 2026
References
4 linked sources
Open source record