dm-pcache: reject a kset that overruns its segment
CVSS score
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EPSS probability
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Risk score
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Published
15 h ago
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
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Evidence confidence
%55
Short explanation
A vulnerability has been resolved in the Linux kernel dm-pcache component where a forged key_num causes a kset to overrun its segment, triggering a cache_pos_advance() BUG_ON [S0].
This vulnerability allows unvalidated data sizes to exceed segment boundaries, which can lead to system instability [S0].
What should be done?
- Follow vendor advisories and updates [S0]
Chain of evidence and sources
Sahte bir key_num değeri, kset boyutunun segmentin kalan alanını aşmasına neden olarak cache_pos_advance() BUG_ON tetiklemesine yol açar [S0].
Medya üzerindeki boyutu cache_seg_remain() değerini aşan bir kset kullanım öncesinde reddedilmelidir [S0].
Show the technical text from the sources
In the Linux kernel, the following vulnerability has been resolved: dm-pcache: reject a kset that overruns its segment cache_replay(), the writeback worker and the GC worker read a kset of get_kset_onmedia_size() bytes and advance the position by it. A forged key_num makes that size exceed the segment's remaining space, so the advance walks past the segment and trips the cache_pos_advance() BUG_ON. Reject a kset whose on-media size exceeds cache_seg_remain() before use.
Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
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| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
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Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-98868 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-98868 weaknesses.
Official Sources and Advisories
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