{"id":"CVE-2025-38051","summary":"smb: client: Fix use-after-free in cifs_fill_dirent","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: Fix use-after-free in cifs_fill_dirent\n\nThere is a race condition in the readdir concurrency process, which may\naccess the rsp buffer after it has been released, triggering the\nfollowing KASAN warning.\n\n ==================================================================\n BUG: KASAN: slab-use-after-free in cifs_fill_dirent+0xb03/0xb60 [cifs]\n Read of size 4 at addr ffff8880099b819c by task a.out/342975\n\n CPU: 2 UID: 0 PID: 342975 Comm: a.out Not tainted 6.15.0-rc6+ #240 PREEMPT(full)\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014\n Call Trace:\n  \u003cTASK\u003e\n  dump_stack_lvl+0x53/0x70\n  print_report+0xce/0x640\n  kasan_report+0xb8/0xf0\n  cifs_fill_dirent+0xb03/0xb60 [cifs]\n  cifs_readdir+0x12cb/0x3190 [cifs]\n  iterate_dir+0x1a1/0x520\n  __x64_sys_getdents+0x134/0x220\n  do_syscall_64+0x4b/0x110\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n RIP: 0033:0x7f996f64b9f9\n Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89\n f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01\n f0 ff ff  0d f7 c3 0c 00 f7 d8 64 89 8\n RSP: 002b:00007f996f53de78 EFLAGS: 00000207 ORIG_RAX: 000000000000004e\n RAX: ffffffffffffffda RBX: 00007f996f53ecdc RCX: 00007f996f64b9f9\n RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003\n RBP: 00007f996f53dea0 R08: 0000000000000000 R09: 0000000000000000\n R10: 0000000000000000 R11: 0000000000000207 R12: ffffffffffffff88\n R13: 0000000000000000 R14: 00007ffc8cd9a500 R15: 00007f996f51e000\n  \u003c/TASK\u003e\n\n Allocated by task 408:\n  kasan_save_stack+0x20/0x40\n  kasan_save_track+0x14/0x30\n  __kasan_slab_alloc+0x6e/0x70\n  kmem_cache_alloc_noprof+0x117/0x3d0\n  mempool_alloc_noprof+0xf2/0x2c0\n  cifs_buf_get+0x36/0x80 [cifs]\n  allocate_buffers+0x1d2/0x330 [cifs]\n  cifs_demultiplex_thread+0x22b/0x2690 [cifs]\n  kthread+0x394/0x720\n  ret_from_fork+0x34/0x70\n  ret_from_fork_asm+0x1a/0x30\n\n Freed by task 342979:\n  kasan_save_stack+0x20/0x40\n  kasan_save_track+0x14/0x30\n  kasan_save_free_info+0x3b/0x60\n  __kasan_slab_free+0x37/0x50\n  kmem_cache_free+0x2b8/0x500\n  cifs_buf_release+0x3c/0x70 [cifs]\n  cifs_readdir+0x1c97/0x3190 [cifs]\n  iterate_dir+0x1a1/0x520\n  __x64_sys_getdents64+0x134/0x220\n  do_syscall_64+0x4b/0x110\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\n The buggy address belongs to the object at ffff8880099b8000\n  which belongs to the cache cifs_request of size 16588\n The buggy address is located 412 bytes inside of\n  freed 16588-byte region [ffff8880099b8000, ffff8880099bc0cc)\n\n The buggy address belongs to the physical page:\n page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x99b8\n head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0\n anon flags: 0x80000000000040(head|node=0|zone=1)\n page_type: f5(slab)\n raw: 0080000000000040 ffff888001e03400 0000000000000000 dead000000000001\n raw: 0000000000000000 0000000000010001 00000000f5000000 0000000000000000\n head: 0080000000000040 ffff888001e03400 0000000000000000 dead000000000001\n head: 0000000000000000 0000000000010001 00000000f5000000 0000000000000000\n head: 0080000000000003 ffffea0000266e01 00000000ffffffff 00000000ffffffff\n head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008\n page dumped because: kasan: bad access detected\n\n Memory state around the buggy address:\n  ffff8880099b8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n  ffff8880099b8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n \u003effff8880099b8180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n                             ^\n  ffff8880099b8200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n  ffff8880099b8280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n ==================================================================\n\nPOC is available in the link [1].\n\nThe problem triggering process is as follows:\n\nProcess 1                       Process 2\n-----------------------------------\n---truncated---","modified":"2026-03-20T12:42:38.770763Z","published":"2025-06-18T09:33:32.805Z","related":["ALSA-2026:0759","ALSA-2026:0760","SUSE-SU-2025:02846-1","SUSE-SU-2025:02853-1","SUSE-SU-2025:02923-1","SUSE-SU-2025:02969-1","SUSE-SU-2025:02996-1","SUSE-SU-2025:02997-1","SUSE-SU-2025:03011-1","SUSE-SU-2025:03023-1","SUSE-SU-2025:20577-1","SUSE-SU-2025:20586-1","SUSE-SU-2025:20601-1","SUSE-SU-2025:20602-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38051.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1b197931fbc821bc7e9e91bf619400db563e3338"},{"type":"WEB","url":"https://git.kernel.org/stable/c/73cadde98f67f76c5eba00ac0b72c453383cec8b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9bea368648ac46f8593a780760362e40291d22a9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9c9aafbacc183598f064902365e107b5e856531f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a24c2f05ac3c5b0aaa539d9d913826d2643dfd0e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a7a8fe56e932a36f43e031b398aef92341bf5ea0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/aee067e88d61eb72e966f094e4749c6b14e7008f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c8623231e0edfcccb7cc6add0288fa0f0594282f"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38051.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-38051"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a364bc0b37f14ffd66c1f982af42990a9d77fa43"},{"fixed":"aee067e88d61eb72e966f094e4749c6b14e7008f"},{"fixed":"a24c2f05ac3c5b0aaa539d9d913826d2643dfd0e"},{"fixed":"1b197931fbc821bc7e9e91bf619400db563e3338"},{"fixed":"c8623231e0edfcccb7cc6add0288fa0f0594282f"},{"fixed":"73cadde98f67f76c5eba00ac0b72c453383cec8b"},{"fixed":"9bea368648ac46f8593a780760362e40291d22a9"},{"fixed":"9c9aafbacc183598f064902365e107b5e856531f"},{"fixed":"a7a8fe56e932a36f43e031b398aef92341bf5ea0"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"0f3da51e7046e2eb28992ba65c22d058f571356c"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-38051.json"}}],"schema_version":"1.7.5"}