CVE-2026-89633High· 7.0▾ TwilightA flaw was found in the Linux kernel's Server Message Block (SMB) client. The `coalesce_t2()` function processes server-supplied `DataOffset` fields without proper validation against buffer boundaries. A remote attacker could exploit this …
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 38.5 · likelihood 0.1 · 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%
— → 7.1
0.2% → 0.5%
— → 7.1
none → high
— → 9.8
none → critical
9.8 → 7.1
critical → high
7.1 → 9.8
high → critical
9.8 → 7.1
critical → high
Last analysed / modified upstream
7.1 → 7
A flaw was found in the Linux kernel's Server Message Block (SMB) client. The coalesce_t2() function processes server-supplied DataOffset fields without proper validation against buffer boundaries. A remote attacker could exploit this by crafting malicious SMB responses. This could lead to out-of-bounds read and write operations, potentially resulting in information disclosure or arbitrary code execution.
kernel: smb: client: fix OOB read/write from unvalidated DataOffset in coalesce_t2() — rated Important 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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