CVE-2026-89632 Linux Kernel smb client - Use-After-Check

Linux kernel contains a use-after-check vulnerability in smb client reparse_buf_ptr() caused by reading ReparseDataLength before validating buffer length, letting remote attackers cause memory corruption, exploit requires crafted server response.

CVSS base score 8.2 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.45% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use-After-Check
Impact
Denial Of Service, Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Published
11 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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