{"id":"CVE-2023-53427","state":"PUBLISHED","title":"cifs: Fix warning and UAF when destroy the MR list","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: Fix warning and UAF when destroy the MR list\n\nIf the MR allocate failed, the MR recovery work not initialized\nand list not cleared. Then will be warning and UAF when release\nthe MR:\n\n  WARNING: CPU: 4 PID: 824 at kernel/workqueue.c:3066 __flush_work.isra.0+0xf7/0x110\n  CPU: 4 PID: 824 Comm: mount.cifs Not tainted 6.1.0-rc5+ #82\n  RIP: 0010:__flush_work.isra.0+0xf7/0x110\n  Call Trace:\n   <TASK>\n   __cancel_work_timer+0x2ba/0x2e0\n   smbd_destroy+0x4e1/0x990\n   _smbd_get_connection+0x1cbd/0x2110\n   smbd_get_connection+0x21/0x40\n   cifs_get_tcp_session+0x8ef/0xda0\n   mount_get_conns+0x60/0x750\n   cifs_mount+0x103/0xd00\n   cifs_smb3_do_mount+0x1dd/0xcb0\n   smb3_get_tree+0x1d5/0x300\n   vfs_get_tree+0x41/0xf0\n   path_mount+0x9b3/0xdd0\n   __x64_sys_mount+0x190/0x1d0\n   do_syscall_64+0x35/0x80\n   entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\n  BUG: KASAN: use-after-free in smbd_destroy+0x4fc/0x990\n  Read of size 8 at addr ffff88810b156a08 by task mount.cifs/824\n  CPU: 4 PID: 824 Comm: mount.cifs Tainted: G        W          6.1.0-rc5+ #82\n  Call Trace:\n   dump_stack_lvl+0x34/0x44\n   print_report+0x171/0x472\n   kasan_report+0xad/0x130\n   smbd_destroy+0x4fc/0x990\n   _smbd_get_connection+0x1cbd/0x2110\n   smbd_get_connection+0x21/0x40\n   cifs_get_tcp_session+0x8ef/0xda0\n   mount_get_conns+0x60/0x750\n   cifs_mount+0x103/0xd00\n   cifs_smb3_do_mount+0x1dd/0xcb0\n   smb3_get_tree+0x1d5/0x300\n   vfs_get_tree+0x41/0xf0\n   path_mount+0x9b3/0xdd0\n   __x64_sys_mount+0x190/0x1d0\n   do_syscall_64+0x35/0x80\n   entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\n  Allocated by task 824:\n   kasan_save_stack+0x1e/0x40\n   kasan_set_track+0x21/0x30\n   __kasan_kmalloc+0x7a/0x90\n   _smbd_get_connection+0x1b6f/0x2110\n   smbd_get_connection+0x21/0x40\n   cifs_get_tcp_session+0x8ef/0xda0\n   mount_get_conns+0x60/0x750\n   cifs_mount+0x103/0xd00\n   cifs_smb3_do_mount+0x1dd/0xcb0\n   smb3_get_tree+0x1d5/0x300\n   vfs_get_tree+0x41/0xf0\n   path_mount+0x9b3/0xdd0\n   __x64_sys_mount+0x190/0x1d0\n   do_syscall_64+0x35/0x80\n   entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\n  Freed by task 824:\n   kasan_save_stack+0x1e/0x40\n   kasan_set_track+0x21/0x30\n   kasan_save_free_info+0x2a/0x40\n   ____kasan_slab_free+0x143/0x1b0\n   __kmem_cache_free+0xc8/0x330\n   _smbd_get_connection+0x1c6a/0x2110\n   smbd_get_connection+0x21/0x40\n   cifs_get_tcp_session+0x8ef/0xda0\n   mount_get_conns+0x60/0x750\n   cifs_mount+0x103/0xd00\n   cifs_smb3_do_mount+0x1dd/0xcb0\n   smb3_get_tree+0x1d5/0x300\n   vfs_get_tree+0x41/0xf0\n   path_mount+0x9b3/0xdd0\n   __x64_sys_mount+0x190/0x1d0\n   do_syscall_64+0x35/0x80\n   entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nLet's initialize the MR recovery work before MR allocate to prevent\nthe warning, remove the MRs from the list to prevent the UAF.","publishedAt":"2025-09-18T16:04:08.917Z","updatedAt":"2026-05-11T19:44:46.222Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c7398583340a6d82b8bb7f7f21edcde27dc6a898","status":"affected","lessThan":"275a3d2b9408fc4895e342f772cab9a89960546e","versionType":"git"},{"version":"c7398583340a6d82b8bb7f7f21edcde27dc6a898","status":"affected","lessThan":"3524d6da0fe88aee79f06be6572955d16ad76b39","versionType":"git"},{"version":"c7398583340a6d82b8bb7f7f21edcde27dc6a898","status":"affected","lessThan":"cfd85a0922c4696d768965e686ad805a58d9d834","versionType":"git"},{"version":"c7398583340a6d82b8bb7f7f21edcde27dc6a898","status":"affected","lessThan":"7cbd5bdb5bd4404a5da4309521134b42c65846c0","versionType":"git"},{"version":"c7398583340a6d82b8bb7f7f21edcde27dc6a898","status":"affected","lessThan":"41832c62a75dad530dc5a2856c92ae5459d497e5","versionType":"git"},{"version":"c7398583340a6d82b8bb7f7f21edcde27dc6a898","status":"affected","lessThan":"2d0c4f5f618f58eba03385363717703bee873c64","versionType":"git"},{"version":"c7398583340a6d82b8bb7f7f21edcde27dc6a898","status":"affected","lessThan":"3e161c2791f8e661eed24a2c624087084d910215","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/cifs/smbdirect.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.16","versionType":"semver"},{"version":"4.19.276","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.235","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.173","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.99","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.16","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.2.3","status":"unaffected","lessThanOrEqual":"6.2.*","versionType":"semver"},{"version":"6.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/cifs/smbdirect.c"]}],"references":["https://git.kernel.org/stable/c/275a3d2b9408fc4895e342f772cab9a89960546e","https://git.kernel.org/stable/c/3524d6da0fe88aee79f06be6572955d16ad76b39","https://git.kernel.org/stable/c/cfd85a0922c4696d768965e686ad805a58d9d834","https://git.kernel.org/stable/c/7cbd5bdb5bd4404a5da4309521134b42c65846c0","https://git.kernel.org/stable/c/41832c62a75dad530dc5a2856c92ae5459d497e5","https://git.kernel.org/stable/c/2d0c4f5f618f58eba03385363717703bee873c64","https://git.kernel.org/stable/c/3e161c2791f8e661eed24a2c624087084d910215"],"weaknesses":["CWE-416"],"ingestedAt":"2026-10-29T20:06:33.064Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/53xxx/CVE-2023-53427.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-53427","state":"PUBLISHED","datePublished":"2025-09-18T16:04:08.917Z","dateUpdated":"2026-05-11T19:44:46.222Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-09-17T14:54:09.743Z"},"containers":{"cna":{"title":"cifs: Fix warning and UAF when destroy the MR list","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: Fix warning and UAF when destroy the MR list\n\nIf the MR allocate failed, the MR recovery work not initialized\nand list not cleared. Then will be warning and UAF when release\nthe MR:\n\n  WARNING: CPU: 4 PID: 824 at kernel/workqueue.c:3066 __flush_work.isra.0+0xf7/0x110\n  CPU: 4 PID: 824 Comm: mount.cifs Not tainted 6.1.0-rc5+ #82\n  RIP: 0010:__flush_work.isra.0+0xf7/0x110\n  Call Trace:\n   <TASK>\n   __cancel_work_timer+0x2ba/0x2e0\n   smbd_destroy+0x4e1/0x990\n   _smbd_get_connection+0x1cbd/0x2110\n   smbd_get_connection+0x21/0x40\n   cifs_get_tcp_session+0x8ef/0xda0\n   mount_get_conns+0x60/0x750\n   cifs_mount+0x103/0xd00\n   cifs_smb3_do_mount+0x1dd/0xcb0\n   smb3_get_tree+0x1d5/0x300\n   vfs_get_tree+0x41/0xf0\n   path_mount+0x9b3/0xdd0\n   __x64_sys_mount+0x190/0x1d0\n   do_syscall_64+0x35/0x80\n   entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\n  BUG: KASAN: use-after-free in smbd_destroy+0x4fc/0x990\n  Read of size 8 at addr ffff88810b156a08 by task mount.cifs/824\n  CPU: 4 PID: 824 Comm: mount.cifs Tainted: G        W          6.1.0-rc5+ #82\n  Call Trace:\n   dump_stack_lvl+0x34/0x44\n   print_report+0x171/0x472\n   kasan_report+0xad/0x130\n   smbd_destroy+0x4fc/0x990\n   _smbd_get_connection+0x1cbd/0x2110\n   smbd_get_connection+0x21/0x40\n   cifs_get_tcp_session+0x8ef/0xda0\n   mount_get_conns+0x60/0x750\n   cifs_mount+0x103/0xd00\n   cifs_smb3_do_mount+0x1dd/0xcb0\n   smb3_get_tree+0x1d5/0x300\n   vfs_get_tree+0x41/0xf0\n   path_mount+0x9b3/0xdd0\n   __x64_sys_mount+0x190/0x1d0\n   do_syscall_64+0x35/0x80\n   entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\n  Allocated by task 824:\n   kasan_save_stack+0x1e/0x40\n   kasan_set_track+0x21/0x30\n   __kasan_kmalloc+0x7a/0x90\n   _smbd_get_connection+0x1b6f/0x2110\n   smbd_get_connection+0x21/0x40\n   cifs_get_tcp_session+0x8ef/0xda0\n   mount_get_conns+0x60/0x750\n   cifs_mount+0x103/0xd00\n   cifs_smb3_do_mount+0x1dd/0xcb0\n   smb3_get_tree+0x1d5/0x300\n   vfs_get_tree+0x41/0xf0\n   path_mount+0x9b3/0xdd0\n   __x64_sys_mount+0x190/0x1d0\n   do_syscall_64+0x35/0x80\n   entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\n  Freed by task 824:\n   kasan_save_stack+0x1e/0x40\n   kasan_set_track+0x21/0x30\n   kasan_save_free_info+0x2a/0x40\n   ____kasan_slab_free+0x143/0x1b0\n   __kmem_cache_free+0xc8/0x330\n   _smbd_get_connection+0x1c6a/0x2110\n   smbd_get_connection+0x21/0x40\n   cifs_get_tcp_session+0x8ef/0xda0\n   mount_get_conns+0x60/0x750\n   cifs_mount+0x103/0xd00\n   cifs_smb3_do_mount+0x1dd/0xcb0\n   smb3_get_tree+0x1d5/0x300\n   vfs_get_tree+0x41/0xf0\n   path_mount+0x9b3/0xdd0\n   __x64_sys_mount+0x190/0x1d0\n   do_syscall_64+0x35/0x80\n   entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nLet's initialize the MR recovery work before MR allocate to prevent\nthe warning, remove the MRs from the list to prevent the UAF."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c7398583340a6d82b8bb7f7f21edcde27dc6a898","status":"affected","lessThan":"275a3d2b9408fc4895e342f772cab9a89960546e","versionType":"git"},{"version":"c7398583340a6d82b8bb7f7f21edcde27dc6a898","status":"affected","lessThan":"3524d6da0fe88aee79f06be6572955d16ad76b39","versionType":"git"},{"version":"c7398583340a6d82b8bb7f7f21edcde27dc6a898","status":"affected","lessThan":"cfd85a0922c4696d768965e686ad805a58d9d834","versionType":"git"},{"version":"c7398583340a6d82b8bb7f7f21edcde27dc6a898","status":"affected","lessThan":"7cbd5bdb5bd4404a5da4309521134b42c65846c0","versionType":"git"},{"version":"c7398583340a6d82b8bb7f7f21edcde27dc6a898","status":"affected","lessThan":"41832c62a75dad530dc5a2856c92ae5459d497e5","versionType":"git"},{"version":"c7398583340a6d82b8bb7f7f21edcde27dc6a898","status":"affected","lessThan":"2d0c4f5f618f58eba03385363717703bee873c64","versionType":"git"},{"version":"c7398583340a6d82b8bb7f7f21edcde27dc6a898","status":"affected","lessThan":"3e161c2791f8e661eed24a2c624087084d910215","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/cifs/smbdirect.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.16","versionType":"semver"},{"version":"4.19.276","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.235","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.173","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.99","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.16","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.2.3","status":"unaffected","lessThanOrEqual":"6.2.*","versionType":"semver"},{"version":"6.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/cifs/smbdirect.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/275a3d2b9408fc4895e342f772cab9a89960546e"},{"url":"https://git.kernel.org/stable/c/3524d6da0fe88aee79f06be6572955d16ad76b39"},{"url":"https://git.kernel.org/stable/c/cfd85a0922c4696d768965e686ad805a58d9d834"},{"url":"https://git.kernel.org/stable/c/7cbd5bdb5bd4404a5da4309521134b42c65846c0"},{"url":"https://git.kernel.org/stable/c/41832c62a75dad530dc5a2856c92ae5459d497e5"},{"url":"https://git.kernel.org/stable/c/2d0c4f5f618f58eba03385363717703bee873c64"},{"url":"https://git.kernel.org/stable/c/3e161c2791f8e661eed24a2c624087084d910215"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T19:44:46.222Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"4.19.276"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"5.4.235"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"5.10.173"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"5.15.99"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"6.1.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"6.2.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"6.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.8,"attackVector":"LOCAL","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"id":"CVE-2023-53427","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-01-14T19:13:56.399666Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-416","lang":"en","type":"CWE","description":"CWE-416 Use After Free"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-01-14T19:23:08.894Z"}}]}}}