CVE-2026-89642High· 7.0▾ TwilightA flaw was found in the Linux kernel's Common Internet File System (CIFS) implementation. When a client extends a file, the `cifs_setsize()` function fails to properly zero out the newly extended portion of the page cache. This oversight c…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 38.5 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.2%
— → 6.5
none → medium
— → 6.5
none → medium
— → 6.5
none → medium
Last analysed / modified upstream
6.5 → 7
medium → high
A flaw was found in the Linux kernel's Common Internet File System (CIFS) implementation. When a client extends a file, the cifs_setsize() function fails to properly zero out the newly extended portion of the page cache. This oversight can lead to stale data from the client's memory being written back to the server, potentially exposing sensitive information to the server.
kernel: cifs: call pagecache_isize_extended() in cifs_setsize() when extending — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.
Affected:
No fix planned:
Not affected:
Affected
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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