Vulnerability CVE-2024-26598
Published: 2024-02-23

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.

 References:
https://git.kernel.org/stable/c/d04acadb6490aa3314f9c9e087691e55de153b88
https://git.kernel.org/stable/c/ba7be666740847d967822bed15500656b26bc703
https://git.kernel.org/stable/c/12c2759ab1343c124ed46ba48f27bd1ef5d2dff4
https://git.kernel.org/stable/c/dba788e25f05209adf2b0175eb1691dc89fb1ba6
https://git.kernel.org/stable/c/65b201bf3e9af1b0254243a5881390eda56f72d1
https://git.kernel.org/stable/c/dd3956a1b3dd11f46488c928cb890d6937d1ca80
https://git.kernel.org/stable/c/ad362fe07fecf0aba839ff2cc59a3617bd42c33f
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