CVE-2026-89769 Linux kernel - Use After Free

Linux kernel contains a use-after-free vulnerability caused by an IRQ leak on cpuhp_setup_state error path in clocksource/drivers/nxp-pit, letting attackers potentially trigger use-after-free via IRQ firing, exploit requires kernel IRQ handling.

CVSS base score 7.4 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.17% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Use After Free, Denial Of Service
CVSS vector
CVSS:3.1/AV:L/AC:H/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 for IRQ leak in nxp-pit driver.

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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