High [CVE-2026-89769] Linux kernel: Use-after-free due to IRQ leak in NXP PIT clocksource driver
This high-severity Red Hat Linux advisory covers CVE-2026-89769.
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Summary
A flaw was found in the Linux kernel's NXP PIT (Programmable Interrupt Timer) clocksource driver. When the CPU hotplug setup fails after an interrupt request (IRQ) has been successfully registered, the error handling does not properly free the IRQ.
This oversight results in a leaked IRQ line and a dangling pointer, which could lead to a use-after-free vulnerability if the IRQ is subsequently triggered. A local attacker could potentially exploit this to cause system instability or execute arbitrary code.
Red Hat severity: Moderate — CVSS 7.5 (CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H). Weakness: CWE-825.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 55 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 55 minutes ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 55 minutes ago·verify at source
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