smb: client: discard post-EOF pagecache when extending a file via zero range
CVSS score
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EPSS probability
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Risk score
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Published
22 h ago
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
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Source agreement
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Evidence confidence
%63
Short explanation
A vulnerability has been resolved in the Linux kernel smb client concerning the failure to discard post-EOF page cache when extending a file via zero range.
Dirty data past the old end of file can become visible when the file is extended, potentially leading to data integrity issues.
What should be done?
- Follow vendor advisories
- Apply relevant kernel update patches
Chain of evidence and sources
smb3_zero_range fonksiyonu, sayfa önbelleğini yalnızca sıfırlanan aralık için kaldırmaktadır.
Eski dosya sonunu kapsayan folio, mmap yoluyla dosya sonu ötesine yazılmış kirli verileri tutabilir.
Show the technical text from the sources
In the Linux kernel, the following vulnerability has been resolved: smb: client: discard post-EOF pagecache when extending a file via zero range smb3_zero_range() removed the pagecache only for the range being zeroed, so when it extends the file the folio straddling the old EOF - which may hold data dirtied past EOF through an mmap - was never dropped and became visible as file content once the file was extended. Lower the discard boundary to the smaller of the zero-range offset and the old EOF.
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 |
|---|---|---|---|---|
| The sources have not yet published a verified CVSS metric. | ||||
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-2026-98686 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-2026-98686 weaknesses.
Official Sources and Advisories
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