{"id":"CVE-2025-39860","revision":null,"records":[{"revision":"e13108e967be438d81369bd3bbc8cc3f","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-39860","aliases":[],"title":"Bluetooth: Fix use-after-free in l2cap_sock_cleanup_listen()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: Fix use-after-free in l2cap_sock_cleanup_listen()\n\nsyzbot reported the splat below without a repro.\n\nIn the splat, a single thread calling bt_accept_dequeue() freed sk\nand touched it after that.\n\nThe root cause would be the racy l2cap_sock_cleanup_listen() call\nadded by the cited commit.\n\nbt_accept_dequeue() is called under lock_sock() except for\nl2cap_sock_release().\n\nTwo threads could see the same socket during the list iteration\nin bt_accept_dequeue():\n\n CPU1 CPU2 (close())\n ---- ----\n sock_hold(sk) sock_hold(sk);\n lock_sock(sk) <-- block close()\n sock_put(sk)\n bt_accept_unlink(sk)\n sock_put(sk) <-- refcnt by bt_accept_enqueue()\n release_sock(sk)\n lock_sock(sk)\n sock_put(sk)\n bt_accept_unlink(sk)\n sock_put(sk) <-- last refcnt\n bt_accept_unlink(sk) <-- UAF\n\nDepending on the timing, the other thread could show up in the\n\"Freed by task\" part.\n\nLet's call l2cap_sock_cleanup_listen() under lock_sock() in\nl2cap_sock_release().\n\n[0]:\nBUG: KASAN: slab-use-after-free in debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]\nBUG: KASAN: slab-use-after-free in do_raw_spin_lock+0x26f/0x2b0 kernel/locking/spinlock_debug.c:115\nRead of size 4 at addr ffff88803b7eb1c4 by task syz.5.3276/16995\nCPU: 3 UID: 0 PID: 16995 Comm: syz.5.3276 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\nCall Trace:\n \n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0xcd/0x630 mm/kasan/report.c:482\n kasan_report+0xe0/0x110 mm/kasan/report.c:595\n debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]\n do_raw_spin_lock+0x26f/0x2b0 kernel/locking/spinlock_debug.c:115\n spin_lock_bh include/linux/spinlock.h:356 [inline]\n release_sock+0x21/0x220 net/core/sock.c:3746\n bt_accept_dequeue+0x505/0x600 net/bluetooth/af_bluetooth.c:312\n l2cap_sock_cleanup_listen+0x5c/0x2a0 net/bluetooth/l2cap_sock.c:1451\n l2cap_sock_release+0x5c/0x210 net/bluetooth/l2cap_sock.c:1425\n __sock_release+0xb3/0x270 net/socket.c:649\n sock_close+0x1c/0x30 net/socket.c:1439\n __fput+0x3ff/0xb70 fs/file_table.c:468\n task_work_run+0x14d/0x240 kernel/task_work.c:227\n resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]\n exit_to_user_mode_loop+0xeb/0x110 kernel/entry/common.c:43\n exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]\n syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]\n syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]\n do_syscall_64+0x3f6/0x4c0 arch/x86/entry/syscall_64.c:100\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f2accf8ebe9\nCode: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007ffdb6cb1378 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4\nRAX: 0000000000000000 RBX: 00000000000426fb RCX: 00007f2accf8ebe9\nRDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003\nRBP: 00007f2acd1b7da0 R08: 0000000000000001 R09: 00000012b6cb166f\nR10: 0000001b30e20000 R11: 0000000000000246 R12: 00007f2acd1b609c\nR13: 00007f2acd1b6090 R14: ffffffffffffffff R15: 00007ffdb6cb1490\n \n\nAllocated by task 5326:\n kasan_save_stack+0x33/0x60 mm/kasan/common.c:47\n kasan_save_track+0x14/0x30 mm/kasan/common.c:68\n poison_kmalloc_redzone mm/kasan/common.c:388 [inline]\n __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:405\n kasan_kmalloc include/linux/kasan.h:260 [inline]\n __do_kmalloc_node mm/slub.c:4365 [inline]\n __kmalloc_nopro\n---truncated---","state":0,"publishedAt":"2025-09-19T15:26:30.767+00:00","modifiedAt":"2026-10-15T22:02:32.48+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/bluetooth/l2cap_sock.c\"\n ],\n \"versions\": [\n {\n \"version\": \"a2da00d1ea1abfb04f846638e210b5b5166e3c9c\",\n \"lessThan\": \"964cbb198f9c46c2b2358cd1faffc04c1e8248cf\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"06f87c96216bc5cd1094c23492274f77f1d5dd3b\",\n \"lessThan\": \"83e1d9892ef51785cf0760b7681436760dda435a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"fbe5a2fed8156cc19eb3b956602b0a1dd46a302d\",\n \"lessThan\": \"47f6090bcf75c369695d21c3f179db8a56bbbd49\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"29fac18499332211b2615ade356e2bd8b3269f98\",\n \"lessThan\": \"2ca99fc3512a8074de20ee52a87b492dfcc41a4d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"1728137b33c00d5a2b5110ed7aafb42e7c32e4a1\",\n \"lessThan\": \"6077d16b5c0f65d571eee709de2f0541fb5ef0ca\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"1728137b33c00d5a2b5110ed7aafb42e7c32e4a1\",\n \"lessThan\": \"306b0991413b482dbf5585b423022123bb505966\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"1728137b33c00d5a2b5110ed7aafb42e7c32e4a1\",\n \"lessThan\": \"3dff390f55ccd9ce12e91233849769b5312180c2\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"1728137b33c00d5a2b5110ed7aafb42e7c32e4a1\",\n \"lessThan\": \"862c628108562d8c7a516a900034823b381d3cba\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"51822644a047eac2310fab0799b64e3430b5a111\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"82cdb2ccbe43337798393369f0ceb98699fe6037\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"10426afe65c8bf7b24dd0c7be4dcc65f86fc99f9\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5.4.253\",\n \"lessThan\": \"5.4.299\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.190\",\n \"lessThan\": \"5.10.243\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.126\",\n \"lessThan\": \"5.15.192\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.45\",\n \"lessThan\": \"6.1.151\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.14.322\",\n \"lessThan\": \"4.15\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.19.291\",\n \"lessThan\": \"4.20\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.4.10\",\n \"lessThan\": \"6.5\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/bluetooth/l2cap_sock.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.5\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.5\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.4.299\",\n \"lessThanOrEqual\": \"5.4.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.243\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.192\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.151\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.105\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.46\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.16.6\",\n \"lessThanOrEqual\": \"6.16.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.17\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/964cbb198f9c46c2b2358cd1faffc04c1e8248cf","https://git.kernel.org/stable/c/83e1d9892ef51785cf0760b7681436760dda435a","https://git.kernel.org/stable/c/47f6090bcf75c369695d21c3f179db8a56bbbd49","https://git.kernel.org/stable/c/2ca99fc3512a8074de20ee52a87b492dfcc41a4d","https://git.kernel.org/stable/c/6077d16b5c0f65d571eee709de2f0541fb5ef0ca","https://git.kernel.org/stable/c/306b0991413b482dbf5585b423022123bb505966","https://git.kernel.org/stable/c/3dff390f55ccd9ce12e91233849769b5312180c2","https://git.kernel.org/stable/c/862c628108562d8c7a516a900034823b381d3cba"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-39860","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-39860","identifiers":["CVE-2025-39860"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-09T12:02:21.9910047+00:00","complete":true,"records":1769,"lastAttemptAt":"2026-11-09T12:02:21.9910047+00:00","lastSuccessAt":"2026-11-09T12:02:22.1773794+00:00","error":null,"lastVerifiedAt":"2026-11-09T12:02:22.1773831+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-24e6fde7b744113daefb8f6135035fb8a5c69c9617c9c0d40574a0376532ffd3-bc5670b92e6417137e6d98178f734a585c0efdac3c24cdab996a156ba398735b","complete":true,"records":421397,"lastAttemptAt":"2026-11-09T12:02:16.4943065+00:00","lastSuccessAt":"2026-11-09T12:02:16.4102763+00:00","error":null,"lastVerifiedAt":"2026-11-09T12:02:16.4943065+00:00","snapshotPublishedAt":"2026-11-09T11:21:04+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. 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Not a global EPSS backfill.","generation":"2026-11-09T12:02:21.9910047+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-09T12:02:21.9910047+00:00","lastSuccessAt":"2026-11-09T12:02:22.1781502+00:00","error":null,"lastVerifiedAt":"2026-11-09T12:02:22.1781508+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. 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