CVE-2026-90326 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability caused by a race condition between blkcg_activate_policy() and concurrent blkcg deletion in blk-cgroup, letting attackers trigger memory corruption during IO scheduler switching, exploit requires concurrent blkcg deletion and policy activation.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.17% 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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
17 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for blk-cgroup race conditions.

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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