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

irqchip/gic-v4: Don't allow a VMOVP on a dying VPE

Kunkun Jiang reported that there is a small window of opportunity for
userspace to force a change of affinity for a VPE while the VPE has already
been unmapped, but the corresponding doorbell interrupt still visible in
/proc/irq/.

Plug the race by checking the value of vmapp_count, which tracks whether
the VPE is mapped ot not, and returning an error in this case.

This involves making vmapp_count common to both GICv4.1 and its v4.0
ancestor.

kernel.org https://git.kernel.org/stable/c/01282ab5182f85e42234df2ff42f0ce790f465ff [No types assigned]

kernel.org https://git.kernel.org/stable/c/1442ee0011983f0c5c4b92380e6853afb513841a [No types assigned]

kernel.org https://git.kernel.org/stable/c/64b12b061c5488e2d69e67c4eaae5da64fd30bfe [No types assigned]

kernel.org https://git.kernel.org/stable/c/755b9532c885b8761fb135fedcd705e21e61cccb [No types assigned]

kernel.org https://git.kernel.org/stable/c/b7d7b7fc876f836f40bf48a87e07ea18756ba196 [No types assigned]

kernel.org https://git.kernel.org/stable/c/d960505a869e66184fff97fb334980a5b797c7c6 [No types assigned]