CVE-2024-42232: libceph: fix race between delayed_work() and ceph_monc_stop()
First published: Wed Aug 07 2024(Updated: )
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
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| 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 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.112-1 6.11.7-1 6.11.9-1 |
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Reference Links
- https://git.kernel.org/stable/c/1177afeca833174ba83504688eec898c6214f4bf
- https://git.kernel.org/stable/c/20cf67dcb7db842f941eff1af6ee5e9dc41796d7
- https://git.kernel.org/stable/c/2d33654d40a05afd91ab24c9a73ab512a0670a9a
- https://git.kernel.org/stable/c/33d38c5da17f8db2d80e811b7829d2822c10625e
- https://git.kernel.org/stable/c/34b76d1922e41da1fa73d43b764cddd82ac9733c
- https://git.kernel.org/stable/c/63e5d035e3a7ab7412a008f202633c5e6a0a28ea
- https://git.kernel.org/stable/c/69c7b2fe4c9cc1d3b1186d1c5606627ecf0de883
- https://git.kernel.org/stable/c/9525af1f58f67df387768770fcf6d6a8f23aee3d
- https://git.kernel.org/linus/69c7b2fe4c9cc1d3b1186d1c5606627ecf0de883
- https://security-tracker.debian.org/tracker/CVE-2024-42232
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-42232
- https://nvd.nist.gov/vuln/detail/CVE-2024-42232
- https://launchpad.net/bugs/cve/CVE-2024-42232
- https://ubuntu.com/security/CVE-2024-42232
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