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

btrfs: reinitialize delayed ref list after deleting it from the list

At insert_delayed_ref() if we need to update the action of an existing
ref to BTRFS_DROP_DELAYED_REF, we delete the ref from its ref head's
ref_add_list using list_del(), which leaves the ref's add_list member
not reinitialized, as list_del() sets the next and prev members of the
list to LIST_POISON1 and LIST_POISON2, respectively.

If later we end up calling drop_delayed_ref() against the ref, which can
happen during merging or when destroying delayed refs due to a transaction
abort, we can trigger a crash since at drop_delayed_ref() we call
list_empty() against the ref's add_list, which returns false since
the list was not reinitialized after the list_del() and as a consequence
we call list_del() again at drop_delayed_ref(). This results in an
invalid list access since the next and prev members are set to poison
pointers, resulting in a splat if CONFIG_LIST_HARDENED and
CONFIG_DEBUG_LIST are set or invalid poison pointer dereferences
otherwise.

So fix this by deleting from the list with list_del_init() instead.

kernel.org https://git.kernel.org/stable/c/2cb1a73d1d44a1c11b0ee5eeced765dd80ec48e6 [No types assigned]

kernel.org https://git.kernel.org/stable/c/2fd0948a483e9cb2d669c7199bc620a21c97673d [No types assigned]

kernel.org https://git.kernel.org/stable/c/50a3933760b427759afdd23156a7280a19357a92 [No types assigned]

kernel.org https://git.kernel.org/stable/c/93c5b8decc0ef39ba84f4211d2db6da0a4aefbeb [No types assigned]

kernel.org https://git.kernel.org/stable/c/bf0b0c6d159767c0d1c21f793950d78486690ee0 [No types assigned]

kernel.org https://git.kernel.org/stable/c/c24fa427fc0ae827b2a3a07f13738cbf82c3f851 [No types assigned]

kernel.org https://git.kernel.org/stable/c/c9a75ec45f1111ef530ab186c2a7684d0a0c9245 [No types assigned]

kernel.org https://git.kernel.org/stable/c/f04be6d68f715c1473a8422fc0460f57b5e99931 [No types assigned]