CVE-2026-89636 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability caused by ce->tgthint pointing to freed cache_dfs_tgt structures in smb client free_tgts(), letting attackers cause memory corruption or denial of service, exploit requires triggering smb client target list free.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.66% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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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