CVE-2024-42232: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.8% chance of exploitation in the next 30 days.

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

Affected products

• Linux Linux Kernel: before 4.19.318 (fixed in 4.19.318); from 4.20, before 5.4.280 (fixed in 5.4.280); from 5.5, before 5.10.222 (fixed in 5.10.222); from 5.11, before 5.15.163 (fixed in 5.15.163); from 5.16, before 6.1.100 (fixed in 6.1.100); from 6.2, before 6.6.41 (fixed in 6.6.41); …

Published 2024-08-07. Last modified 2026-08-04.