CVE-2026-98870 Linux Kernel ksmbd - Use After Free

Linux kernel ksmbd contains a use-after-free vulnerability caused by improper removal of stale channels from sessions during connection teardown, letting attackers cause memory corruption, exploit requires connection teardown with cleared binding flag.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.25% 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:L/UI:N/S:U/C:H/I:H/A:H
Published
23 October 2026
Updated
25 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix that removes the conn->binding gate during channel removal on teardown.

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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