smb: client: discard post-EOF pagecache when extending a file via clone range
CVSS score
—
EPSS probability
%0.2
Risk score
—
Published
1 d ago
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
2
Source agreement
Tam uyum
Evidence confidence
%63
Short explanation
A vulnerability has been identified in the Linux kernel SMB client where extending a file via clone range fails to discard the post-EOF pagecache, causing data to become visible as file content.
This vulnerability causes data dirtied past the old EOF via mmap to become visible as file content when the file is extended. Patch status and affected versions are tracked in vendor sources.
What should be done?
- Follow vendor advisories
- Apply kernel updates
Chain of evidence and sources
cifs_remap_file_range() fonksiyonu, sayfa önbelleğini yalnızca hedef bölgeyle örtüşen folio'lar için temizlemektedir.
Eski EOF ötesinde mmap yoluyla kirletilmiş veriler, dosya uzatıldığında görünür hale gelmektedir.
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 clone range cifs_remap_file_range() discarded the pagecache only for the folios overlapping the destination region, so when a clone 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. Start the discard at the smaller of fstart and the old EOF. i_size is still old here, so nothing past the old EOF is flushed to the server.
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
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| 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-2026-98685 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-2026-98685 weaknesses.
Official Sources and Advisories
Yama durumu bilinmiyor
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