CVE-2024-26598: KVM: arm64: vgic-its: Avoid potential UAF in LPI translation cache

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-02-23 · updated 2026-08-04
Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: vgic-its: Avoid potential UAF in LPI translation cache There is a potential UAF scenario in the case of an LPI translation cache hit racing with an operation that invalidates the cache, such as a DISCARD ITS command. The root of the problem is that vgic_its_check_cache() does not elevate the refcount on the vgic_irq before dropping the lock that serializes refcount changes. Have vgic_its_check_cache() raise the refcount on the returned vgic_irq and add the corresponding decrement after queueing the interrupt.

Affected products

Debian Linux: 10.0
Linux kernel: from 5.4 before 5.4.269; from 5.5 before 5.10.209; from 5.11 before 5.15.148; from 5.16 before 6.1.75; from 6.2 before 6.6.14; from 6.7 before 6.7.2 — fixed in 5.10.209, 5.15.148, 5.4.269, 6.1.75, 6.6.14, 6.7.2

How to fix

Upgrade to a fixed version: Linux kernel 5.10.209, 5.15.148, 5.4.269, 6.1.75. Check the vendor advisory for mitigations.

References

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