{"id":"CVE-2025-68305","state":"PUBLISHED","title":"Bluetooth: hci_sock: Prevent race in socket write iter and sock bind","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sock: Prevent race in socket write iter and sock bind\n\nThere is a potential race condition between sock bind and socket write\niter. bind may free the same cmd via mgmt_pending before write iter sends\nthe cmd, just as syzbot reported in UAF[1].\n\nHere we use hci_dev_lock to synchronize the two, thereby avoiding the\nUAF mentioned in [1].\n\n[1]\nsyzbot reported:\nBUG: KASAN: slab-use-after-free in mgmt_pending_remove+0x3b/0x210 net/bluetooth/mgmt_util.c:316\nRead of size 8 at addr ffff888077164818 by task syz.0.17/5989\nCall Trace:\n mgmt_pending_remove+0x3b/0x210 net/bluetooth/mgmt_util.c:316\n set_link_security+0x5c2/0x710 net/bluetooth/mgmt.c:1918\n hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719\n hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839\n sock_sendmsg_nosec net/socket.c:727 [inline]\n __sock_sendmsg+0x21c/0x270 net/socket.c:742\n sock_write_iter+0x279/0x360 net/socket.c:1195\n\nAllocated by task 5989:\n mgmt_pending_add+0x35/0x140 net/bluetooth/mgmt_util.c:296\n set_link_security+0x557/0x710 net/bluetooth/mgmt.c:1910\n hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719\n hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839\n sock_sendmsg_nosec net/socket.c:727 [inline]\n __sock_sendmsg+0x21c/0x270 net/socket.c:742\n sock_write_iter+0x279/0x360 net/socket.c:1195\n\nFreed by task 5991:\n mgmt_pending_free net/bluetooth/mgmt_util.c:311 [inline]\n mgmt_pending_foreach+0x30d/0x380 net/bluetooth/mgmt_util.c:257\n mgmt_index_removed+0x112/0x2f0 net/bluetooth/mgmt.c:9477\n hci_sock_bind+0xbe9/0x1000 net/bluetooth/hci_sock.c:1314","publishedAt":"2025-12-16T15:06:22.812Z","updatedAt":"2026-08-23T12:45:27.050Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7b5958332f20dc66b19be564c402dbc21b927a81","status":"affected","lessThan":"7344feaed3c8aa46d397984ae855e6026d3c3e95","versionType":"git"},{"version":"bdd56875c6926d8009914f427df71797693e90d4","status":"affected","lessThan":"fe68510fc99bb4b88c9c611f83699749002d515a","versionType":"git"},{"version":"4e83f2dbb2bf677e614109df24426c4dded472d4","status":"affected","lessThan":"e90c05fc5bbea956450a05cc3b36b8fa29cf195e","versionType":"git"},{"version":"6fe26f694c824b8a4dbf50c635bee1302e3f099c","status":"affected","lessThan":"69fcb0344bc0dd5b13d7e4e98f8b6bf25a6d4ff7","versionType":"git"},{"version":"6fe26f694c824b8a4dbf50c635bee1302e3f099c","status":"affected","lessThan":"89bb613511cc21ed5ba6bddc1c9b9ae9c0dad392","versionType":"git"},{"version":"d7882db79135c829a922daf3571f33ea1e056ae3","status":"affected","versionType":"git"},{"version":"6.6.94","status":"affected","lessThan":"6.6.119","versionType":"semver"},{"version":"6.12.34","status":"affected","lessThan":"6.12.61","versionType":"semver"},{"version":"6.15.3","status":"affected","lessThan":"6.16","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_sock.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.16","versionType":"semver"},{"version":"6.6.119","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.61","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.11","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_sock.c"]}],"references":["https://git.kernel.org/stable/c/7344feaed3c8aa46d397984ae855e6026d3c3e95","https://git.kernel.org/stable/c/fe68510fc99bb4b88c9c611f83699749002d515a","https://git.kernel.org/stable/c/e90c05fc5bbea956450a05cc3b36b8fa29cf195e","https://git.kernel.org/stable/c/69fcb0344bc0dd5b13d7e4e98f8b6bf25a6d4ff7","https://git.kernel.org/stable/c/89bb613511cc21ed5ba6bddc1c9b9ae9c0dad392"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:56.034Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/68xxx/CVE-2025-68305.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-68305","state":"PUBLISHED","datePublished":"2025-12-16T15:06:22.812Z","dateUpdated":"2026-08-23T12:45:27.050Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-12-16T14:48:05.294Z"},"containers":{"cna":{"title":"Bluetooth: hci_sock: Prevent race in socket write iter and sock bind","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sock: Prevent race in socket write iter and sock bind\n\nThere is a potential race condition between sock bind and socket write\niter. bind may free the same cmd via mgmt_pending before write iter sends\nthe cmd, just as syzbot reported in UAF[1].\n\nHere we use hci_dev_lock to synchronize the two, thereby avoiding the\nUAF mentioned in [1].\n\n[1]\nsyzbot reported:\nBUG: KASAN: slab-use-after-free in mgmt_pending_remove+0x3b/0x210 net/bluetooth/mgmt_util.c:316\nRead of size 8 at addr ffff888077164818 by task syz.0.17/5989\nCall Trace:\n mgmt_pending_remove+0x3b/0x210 net/bluetooth/mgmt_util.c:316\n set_link_security+0x5c2/0x710 net/bluetooth/mgmt.c:1918\n hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719\n hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839\n sock_sendmsg_nosec net/socket.c:727 [inline]\n __sock_sendmsg+0x21c/0x270 net/socket.c:742\n sock_write_iter+0x279/0x360 net/socket.c:1195\n\nAllocated by task 5989:\n mgmt_pending_add+0x35/0x140 net/bluetooth/mgmt_util.c:296\n set_link_security+0x557/0x710 net/bluetooth/mgmt.c:1910\n hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719\n hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839\n sock_sendmsg_nosec net/socket.c:727 [inline]\n __sock_sendmsg+0x21c/0x270 net/socket.c:742\n sock_write_iter+0x279/0x360 net/socket.c:1195\n\nFreed by task 5991:\n mgmt_pending_free net/bluetooth/mgmt_util.c:311 [inline]\n mgmt_pending_foreach+0x30d/0x380 net/bluetooth/mgmt_util.c:257\n mgmt_index_removed+0x112/0x2f0 net/bluetooth/mgmt.c:9477\n hci_sock_bind+0xbe9/0x1000 net/bluetooth/hci_sock.c:1314"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7b5958332f20dc66b19be564c402dbc21b927a81","status":"affected","lessThan":"7344feaed3c8aa46d397984ae855e6026d3c3e95","versionType":"git"},{"version":"bdd56875c6926d8009914f427df71797693e90d4","status":"affected","lessThan":"fe68510fc99bb4b88c9c611f83699749002d515a","versionType":"git"},{"version":"4e83f2dbb2bf677e614109df24426c4dded472d4","status":"affected","lessThan":"e90c05fc5bbea956450a05cc3b36b8fa29cf195e","versionType":"git"},{"version":"6fe26f694c824b8a4dbf50c635bee1302e3f099c","status":"affected","lessThan":"69fcb0344bc0dd5b13d7e4e98f8b6bf25a6d4ff7","versionType":"git"},{"version":"6fe26f694c824b8a4dbf50c635bee1302e3f099c","status":"affected","lessThan":"89bb613511cc21ed5ba6bddc1c9b9ae9c0dad392","versionType":"git"},{"version":"d7882db79135c829a922daf3571f33ea1e056ae3","status":"affected","versionType":"git"},{"version":"6.6.94","status":"affected","lessThan":"6.6.119","versionType":"semver"},{"version":"6.12.34","status":"affected","lessThan":"6.12.61","versionType":"semver"},{"version":"6.15.3","status":"affected","lessThan":"6.16","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_sock.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.16","versionType":"semver"},{"version":"6.6.119","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.61","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.11","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_sock.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/7344feaed3c8aa46d397984ae855e6026d3c3e95"},{"url":"https://git.kernel.org/stable/c/fe68510fc99bb4b88c9c611f83699749002d515a"},{"url":"https://git.kernel.org/stable/c/e90c05fc5bbea956450a05cc3b36b8fa29cf195e"},{"url":"https://git.kernel.org/stable/c/69fcb0344bc0dd5b13d7e4e98f8b6bf25a6d4ff7"},{"url":"https://git.kernel.org/stable/c/89bb613511cc21ed5ba6bddc1c9b9ae9c0dad392"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-23T12:45:27.050Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.94","versionEndExcluding":"6.6.119"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.34","versionEndExcluding":"6.12.61"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"6.17.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"6.18"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-16T16:21:37.869509Z","id":"CVE-2025-68305","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-16T16:21:48.549Z"}}]}}}