{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2025-39860", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-39860", "idYear": 2025, "status": "PUBLISHED", "publishedAt": "2025-09-19T15:26:30.767Z", "updatedAt": "2026-10-15T22:02:32.480Z", "importedAt": "2026-10-24T01:57:34.152Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "Bluetooth: Fix use-after-free in l2cap_sock_cleanup_listen()", "summary": "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---", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "a2da00d1ea1abfb04f846638e210b5b5166e3c9c", "status": "affected", "versionType": "git", "lessThan": "964cbb198f9c46c2b2358cd1faffc04c1e8248cf" }, { "version": "06f87c96216bc5cd1094c23492274f77f1d5dd3b", "status": "affected", "versionType": "git", "lessThan": "83e1d9892ef51785cf0760b7681436760dda435a" }, { "version": "fbe5a2fed8156cc19eb3b956602b0a1dd46a302d", "status": "affected", "versionType": "git", "lessThan": "47f6090bcf75c369695d21c3f179db8a56bbbd49" }, { "version": "29fac18499332211b2615ade356e2bd8b3269f98", "status": "affected", "versionType": "git", "lessThan": "2ca99fc3512a8074de20ee52a87b492dfcc41a4d" }, { "version": "1728137b33c00d5a2b5110ed7aafb42e7c32e4a1", "status": "affected", "versionType": "git", "lessThan": "6077d16b5c0f65d571eee709de2f0541fb5ef0ca" }, { "version": "1728137b33c00d5a2b5110ed7aafb42e7c32e4a1", "status": "affected", "versionType": "git", "lessThan": "306b0991413b482dbf5585b423022123bb505966" }, { "version": "1728137b33c00d5a2b5110ed7aafb42e7c32e4a1", "status": "affected", "versionType": "git", "lessThan": "3dff390f55ccd9ce12e91233849769b5312180c2" }, { "version": "1728137b33c00d5a2b5110ed7aafb42e7c32e4a1", "status": "affected", "versionType": "git", "lessThan": "862c628108562d8c7a516a900034823b381d3cba" }, { "version": "51822644a047eac2310fab0799b64e3430b5a111", "status": "affected", "versionType": "git" }, { "version": "82cdb2ccbe43337798393369f0ceb98699fe6037", "status": "affected", "versionType": "git" }, { "version": "10426afe65c8bf7b24dd0c7be4dcc65f86fc99f9", "status": "affected", "versionType": "git" }, { "version": "5.4.253", "status": "affected", "versionType": "semver", "lessThan": "5.4.299" }, { "version": "5.10.190", "status": "affected", "versionType": "semver", "lessThan": "5.10.243" }, { "version": "5.15.126", "status": "affected", "versionType": "semver", "lessThan": "5.15.192" }, { "version": "6.1.45", "status": "affected", "versionType": "semver", "lessThan": "6.1.151" }, { "version": "4.14.322", "status": "affected", "versionType": "semver", "lessThan": "4.15" }, { "version": "4.19.291", "status": "affected", "versionType": "semver", "lessThan": "4.20" }, { "version": "6.4.10", "status": "affected", "versionType": "semver", "lessThan": "6.5" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "6.5", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "6.5" }, { "version": "5.4.299", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.243", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.192", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.151", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.105", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.46", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.16.6", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.16.*" }, { "version": "6.17", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }