CVE-2026-89630High· 7.0▾ TwilightA flaw was found in the Linux kernel's Server Message Block (SMB) client. An incorrect calculation of the `data_offset` bound in the `is_valid_oplock_break()` function can lead to a read overflow. This vulnerability allows a malicious SMB …
▾ 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%
— → 6.3
none → medium
— → 9.1
none → critical
Last analysed / modified upstream
9.1 → 6.3
critical → medium
6.3 → 9.1
medium → critical
9.1 → 6.3
critical → medium
6.3 → 7
medium → high
0.2% → 0.5%
A flaw was found in the Linux kernel's Server Message Block (SMB) client. An incorrect calculation of the data_offset bound in the is_valid_oplock_break() function can lead to a read overflow. This vulnerability allows a malicious SMB server to potentially trigger an out-of-bounds read, which could result in information disclosure or a denial of service.
kernel: smb: client: restore the data_offset bound in is_valid_oplock_break() — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.
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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