{"id":"DEBIAN-CVE-2025-68285","details":"In the Linux kernel, the following vulnerability has been resolved:  libceph: fix potential use-after-free in have_mon_and_osd_map()  The wait loop in __ceph_open_session() can race with the client receiving a new monmap or osdmap shortly after the initial map is received.  Both ceph_monc_handle_map() and handle_one_map() install a new map immediately after freeing the old one      kfree(monc-\u003emonmap);     monc-\u003emonmap = monmap;      ceph_osdmap_destroy(osdc-\u003eosdmap);     osdc-\u003eosdmap = newmap;  under client-\u003emonc.mutex and client-\u003eosdc.lock respectively, but because neither is taken in have_mon_and_osd_map() it's possible for client-\u003emonc.monmap-\u003eepoch and client-\u003eosdc.osdmap-\u003eepoch arms in      client-\u003emonc.monmap && client-\u003emonc.monmap-\u003eepoch &&         client-\u003eosdc.osdmap && client-\u003eosdc.osdmap-\u003eepoch;  condition to dereference an already freed map.  This happens to be reproducible with generic/395 and generic/397 with KASAN enabled:      BUG: KASAN: slab-use-after-free in have_mon_and_osd_map+0x56/0x70     Read of size 4 at addr ffff88811012d810 by task mount.ceph/13305     CPU: 2 UID: 0 PID: 13305 Comm: mount.ceph Not tainted 6.14.0-rc2-build2+ #1266     ...     Call Trace:     \u003cTASK\u003e     have_mon_and_osd_map+0x56/0x70     ceph_open_session+0x182/0x290     ceph_get_tree+0x333/0x680     vfs_get_tree+0x49/0x180     do_new_mount+0x1a3/0x2d0     path_mount+0x6dd/0x730     do_mount+0x99/0xe0     __do_sys_mount+0x141/0x180     do_syscall_64+0x9f/0x100     entry_SYSCALL_64_after_hwframe+0x76/0x7e     \u003c/TASK\u003e      Allocated by task 13305:     ceph_osdmap_alloc+0x16/0x130     ceph_osdc_init+0x27a/0x4c0     ceph_create_client+0x153/0x190     create_fs_client+0x50/0x2a0     ceph_get_tree+0xff/0x680     vfs_get_tree+0x49/0x180     do_new_mount+0x1a3/0x2d0     path_mount+0x6dd/0x730     do_mount+0x99/0xe0     __do_sys_mount+0x141/0x180     do_syscall_64+0x9f/0x100     entry_SYSCALL_64_after_hwframe+0x76/0x7e      Freed by task 9475:     kfree+0x212/0x290     handle_one_map+0x23c/0x3b0     ceph_osdc_handle_map+0x3c9/0x590     mon_dispatch+0x655/0x6f0     ceph_con_process_message+0xc3/0xe0     ceph_con_v1_try_read+0x614/0x760     ceph_con_workfn+0x2de/0x650     process_one_work+0x486/0x7c0     process_scheduled_works+0x73/0x90     worker_thread+0x1c8/0x2a0     kthread+0x2ec/0x300     ret_from_fork+0x24/0x40     ret_from_fork_asm+0x1a/0x30  Rewrite the wait loop to check the above condition directly with client-\u003emonc.mutex and client-\u003eosdc.lock taken as appropriate.  While at it, improve the timeout handling (previously mount_timeout could be exceeded in case wait_event_interruptible_timeout() slept more than once) and access client-\u003eauth_err under client-\u003emonc.mutex to match how it's set in finish_auth().  monmap_show() and osdmap_show() now take the respective lock before accessing the map as well.","modified":"2026-09-01T16:06:21.588681792Z","published":"2025-12-16T16:16:07.293Z","upstream":["CVE-2025-68285"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2025-68285"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.159-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-68285.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.63-1"}]}],"versions":["6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1~bpo12+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-68285.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.17.11-1"}]}],"versions":["6.12.100-1","6.12.101-1","6.12.105-1","6.12.107-1","6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1","6.12.69-1~bpo12+1","6.12.73-1","6.12.73-1~bpo12+1","6.12.74-1","6.12.74-2","6.12.74-2~bpo12+1","6.12.85-1","6.12.85-1~bpo12+1","6.12.86-1","6.12.86-1~bpo12+1","6.12.88-1","6.12.88-1~bpo12+1","6.12.90-1","6.12.90-1~bpo12+1","6.12.90-2","6.12.90-2~bpo12+1","6.12.94-1","6.12.94-1~bpo12+1","6.12.95-1","6.12.95-1~bpo12+1","6.12.96-1","6.13.10-1~exp1","6.13.11-1~exp1","6.13.2-1~exp1","6.13.3-1~exp1","6.13.4-1~exp1","6.13.5-1~exp1","6.13.6-1~exp1","6.13.7-1~exp1","6.13.8-1~exp1","6.13.9-1~exp1","6.13~rc6-1~exp1","6.13~rc7-1~exp1","6.14.3-1~exp1","6.14.5-1~exp1","6.14.6-1~exp1","6.15-1~exp1","6.15.1-1~exp1","6.15.2-1~exp1","6.15.3-1~exp1","6.15.4-1~exp1","6.15.5-1~exp1","6.15.6-1~exp1","6.15~rc7-1~exp1","6.16-1~exp1","6.16.1-1~exp1","6.16.10-1","6.16.11-1","6.16.12-1","6.16.12-1~bpo13+1","6.16.12-2","6.16.3-1","6.16.3-1~bpo13+1","6.16.5-1","6.16.6-1","6.16.7-1","6.16.8-1","6.16.9-1","6.16~rc7-1~exp1","6.17.10-1","6.17.2-1~exp1","6.17.5-1~exp1","6.17.6-1","6.17.7-1","6.17.7-2","6.17.8-1","6.17.8-1~bpo13+1","6.17.9-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-68285.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}