[ceph] parse_longname(): strrchr() expects NUL-terminated string (CVE-2025-38660) | HOL Guard CVE

Critical · CVSS 9.8CVE-2025-38660

[ceph] parse_longname(): strrchr() expects NUL-terminated string

Answer in brief

CVE-2025-38660 records a Critical severity (CVSS 9.8) vulnerability in [ceph] parse_longname(): strrchr() expects NUL-terminated string. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), 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 Aug 22, 2025Updated Sep 14, 2026Source checked Sep 20, 2026First seen by HOL Aug 5, 2026Material review Sep 14, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.8
Exploitation: Not marked as known exploited
Affected software: 4 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), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:o:linux:linux_kernel::::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=dd66df0053ef84add5e684df517aa9b498342381 <bb80f7618832d26f7e395f52f82b1dac76223e5f \|\| >=dd66df0053ef84add5e684df517aa9b498342381 <3145b2b11492d61c512bbc59660bb823bc757f48 \|\| >=dd66df0053ef84add5e684df517aa9b498342381 <493479af8af3ab907f49e99323777d498a4fbd2b \|\| >=dd66df0053ef84add5e684df517aa9b498342381 <101841c38346f4ca41dc1802c867da990ffb32eb	bb80f7618832d26f7e395f52f82b1dac76223e5f, 3145b2b11492d61c512bbc59660bb823bc757f48, 493479af8af3ab907f49e99323777d498a4fbd2b, 101841c38346f4ca41dc1802c867da990ffb32eb
Linux/Linuxgeneric	6.6	Not reported
Linux/Linuxgeneric	>=dd66df0053ef84add5e684df517aa9b498342381 <4b9aee707c4580511983a0998547f3b28514e6a6 \|\| >=dd66df0053ef84add5e684df517aa9b498342381 <bb80f7618832d26f7e395f52f82b1dac76223e5f \|\| >=dd66df0053ef84add5e684df517aa9b498342381 <3145b2b11492d61c512bbc59660bb823bc757f48 \|\| >=dd66df0053ef84add5e684df517aa9b498342381 <493479af8af3ab907f49e99323777d498a4fbd2b \|\| >=dd66df0053ef84add5e684df517aa9b498342381 <101841c38346f4ca41dc1802c867da990ffb32eb	4b9aee707c4580511983a0998547f3b28514e6a6, bb80f7618832d26f7e395f52f82b1dac76223e5f, 3145b2b11492d61c512bbc59660bb823bc757f48, 493479af8af3ab907f49e99323777d498a4fbd2b, 101841c38346f4ca41dc1802c867da990ffb32eb

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to bb80f7618832d26f7e395f52f82b1dac76223e5f; Linux/Linux to 4b9aee707c4580511983a0998547f3b28514e6a6 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 22, 2025
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 14, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 5, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: [ceph] parse_longname(): strrchr() expects NUL-terminated string ... and parse_longname() is not guaranteed that. That's the reason why it uses kmemdup_nul() to build the argument for kstrtou64(); the problem is, kstrtou64() is not the only thing that need it. Just get a NUL-terminated copy of the entire thing and be done with that...

Quoted source text, attributed separately from HOL analysis.