CVE-2026-72288

In the Linux kernel, the following vulnerability has been resolved:

KVM: arm64: vgic: Handle race between interrupt affinity change and LPI disabling

Hyunwoo Kim reports some really bad races should the following

situation occur:

• LPI-I is pending in vcpu-B's AP list
• vcpu-A writes to vcpu-B's RD to disable its LPIs
• vcpu-C moves I from B to C

If the last two race nicely enough, vgicpruneap_list() can drop

the irq and AP list locks, reacquire them, and in the interval

the irq has been freed. UAF follows.

The fix is two-fold:

• Before dropping the irq and ap_list locks, take a reference on

  the irq

• Do not try to handle migration of the pending bit: there is no

  expectation that this state is retained, as per the architecture

With that, we're sure that the interrupt is still around, and we

safely remove it from the AP list as it has no target at this

stage (unless another interrupt fires, but that's another story).