CVE-2026-72288
CriticalCVSS 9.3Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
In the Linux kernel for KVM on arm64, vgic_prune_ap_list() had a race between interrupt affinity change and LPI disabling, which could lead to use-after-free (UAF). The fix takes a reference on the interrupt before dropping locks and does not attempt to migrate the pending bit.
Risk Assessment
Use-after-free could lead to remote code execution or system crash, posing a serious security threat.
Recommendation
Immediately apply the Linux kernel update containing this fix to prevent UAF.
Original NVD description (English source)
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, vgic_prune_ap_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).