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

ipc/shm: serialize orphan cleanup with shm_nattch updates

shm_destroy_orphaned() walks the shm idr under shm_ids(ns).rwsem, but that
does not serialize all fields tested by shm_may_destroy().  In particular,
shm_nattch is updated while holding shm_perm.lock, and attach paths can do
that without holding the rwsem.

Do not decide that an orphaned segment is unused before taking the object
lock.  Move the shm_may_destroy() check under shm_perm.lock, matching the
other destroy paths, and unlock the segment when it no longer qualifies
for removal.

https://git.kernel.org/stable/c/030bbc857bd51d4b25a90d931d3f8775ef22823a

https://git.kernel.org/stable/c/1f0d01e35dbb228084d5187212e32c91a30dcbeb

https://git.kernel.org/stable/c/2e5c6f4fd4001562781e99bbfc7f1f0127187542

https://git.kernel.org/stable/c/6560be3f6a5bb84f006f184f0c966747bb58e1a3

https://git.kernel.org/stable/c/92cda2593cf2ed25b0e9d78e5e6d8303bba1a064

https://git.kernel.org/stable/c/b1e9aef48e4d8a0c1b54fb913077b0824ed7d650

https://git.kernel.org/stable/c/b5107b4ce3ad45fcf369ee2058c8910620f4b5a8

https://git.kernel.org/stable/c/db752ebfdaf2c7f27cd9690ef48b616af068319c

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