CVE-2024-42232

In the Linux kernel, the following vulnerability has been resolved: libceph: fix race between delayed_work() and ceph_monc_stop() The way the delayed work is handled in ceph_monc_stop() is prone to races with mon_fault() and possibly also finish_hunting(). Both of these can requeue the delayed work which wouldn't be canceled by any of the following code in case that happens after cancel_delayed_work_sync() runs -- __close_session() doesn't mess with the delayed work in order to avoid interfering with the hunting interval logic. This part was missed in commit b5d91704f53e ("libceph: behave in mon_fault() if cur_mon < 0") and use-after-free can still ensue on monc and objects that hang off of it, with monc->auth and monc->monmap being particularly susceptible to quickly being reused. To fix this: - clear monc->cur_mon and monc->hunting as part of closing the session in ceph_monc_stop() - bail from delayed_work() if monc->cur_mon is cleared, similar to how it's done in mon_fault() and finish_hunting() (based on monc->hunting) - call cancel_delayed_work_sync() after the session is closed

• linux linux kernel (< 4.19.318) • linux linux kernel (>= 4.20 < 5.4.280) • linux linux kernel (>= 5.5 < 5.10.222) • linux linux kernel (>= 5.11 < 5.15.163) • linux linux kernel (>= 5.16 < 6.1.100) • linux linux kernel (>= 6.2 < 6.6.41) • linux linux kernel (>= 6.7 < 6.9.10)