{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-49950","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-10-21T12:17:06.046Z","datePublished":"2024-10-21T18:02:06.387Z","dateUpdated":"2026-08-05T11:40:37.563Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:40:37.563Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix uaf in l2cap_connect\n\n[Syzbot reported]\nBUG: KASAN: slab-use-after-free in l2cap_connect.constprop.0+0x10d8/0x1270 net/bluetooth/l2cap_core.c:3949\nRead of size 8 at addr ffff8880241e9800 by task kworker/u9:0/54\n\nCPU: 0 UID: 0 PID: 54 Comm: kworker/u9:0 Not tainted 6.11.0-rc6-syzkaller-00268-g788220eee30d #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024\nWorkqueue: hci2 hci_rx_work\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:93 [inline]\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0xc3/0x620 mm/kasan/report.c:488\n kasan_report+0xd9/0x110 mm/kasan/report.c:601\n l2cap_connect.constprop.0+0x10d8/0x1270 net/bluetooth/l2cap_core.c:3949\n l2cap_connect_req net/bluetooth/l2cap_core.c:4080 [inline]\n l2cap_bredr_sig_cmd net/bluetooth/l2cap_core.c:4772 [inline]\n l2cap_sig_channel net/bluetooth/l2cap_core.c:5543 [inline]\n l2cap_recv_frame+0xf0b/0x8eb0 net/bluetooth/l2cap_core.c:6825\n l2cap_recv_acldata+0x9b4/0xb70 net/bluetooth/l2cap_core.c:7514\n hci_acldata_packet net/bluetooth/hci_core.c:3791 [inline]\n hci_rx_work+0xaab/0x1610 net/bluetooth/hci_core.c:4028\n process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231\n process_scheduled_works kernel/workqueue.c:3312 [inline]\n worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389\n kthread+0x2c1/0x3a0 kernel/kthread.c:389\n ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244\n...\n\nFreed by task 5245:\n kasan_save_stack+0x33/0x60 mm/kasan/common.c:47\n kasan_save_track+0x14/0x30 mm/kasan/common.c:68\n kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579\n poison_slab_object+0xf7/0x160 mm/kasan/common.c:240\n __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256\n kasan_slab_free include/linux/kasan.h:184 [inline]\n slab_free_hook mm/slub.c:2256 [inline]\n slab_free mm/slub.c:4477 [inline]\n kfree+0x12a/0x3b0 mm/slub.c:4598\n l2cap_conn_free net/bluetooth/l2cap_core.c:1810 [inline]\n kref_put include/linux/kref.h:65 [inline]\n l2cap_conn_put net/bluetooth/l2cap_core.c:1822 [inline]\n l2cap_conn_del+0x59d/0x730 net/bluetooth/l2cap_core.c:1802\n l2cap_connect_cfm+0x9e6/0xf80 net/bluetooth/l2cap_core.c:7241\n hci_connect_cfm include/net/bluetooth/hci_core.h:1960 [inline]\n hci_conn_failed+0x1c3/0x370 net/bluetooth/hci_conn.c:1265\n hci_abort_conn_sync+0x75a/0xb50 net/bluetooth/hci_sync.c:5583\n abort_conn_sync+0x197/0x360 net/bluetooth/hci_conn.c:2917\n hci_cmd_sync_work+0x1a4/0x410 net/bluetooth/hci_sync.c:328\n process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231\n process_scheduled_works kernel/workqueue.c:3312 [inline]\n worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389\n kthread+0x2c1/0x3a0 kernel/kthread.c:389\n ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:A - The vulnerable code is reached purely from ACL data received from a remote Bluetooth peer on the BR/EDR L2CAP signalling channel (hci_rx_work → hci_acldata_packet → l2cap_recv_acldata → l2cap_sig_channel → l2cap_connect_req). Bluetooth range constitutes an adjacent network.\nAC:L - The remote peer controls both sides of the race — it chooses when to inject the L2CAP connect request relative to link setup (the exact condition named in the Fixes: commit) and can induce the concurrent connection abort by failing the security escalation its own request triggers or by repeated connect/teardown. The attempt is free to repeat until it wins.\nPR:N - L2CAP signalling commands are processed on an unauthenticated, unpaired ACL link; the hci_conn_check_link_mode() security check sits inside l2cap_connect() and executes only after the use-after-free dereference. No credentials or local account are needed.\nUI:N - Processing of an inbound ACL connection and its L2CAP connect request happens automatically in the kernel rx workqueue on any connectable device. No victim action is required.\nS:U - The corruption and its consequences are confined to the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed struct l2cap_conn is read back and its embedded pointers (conn->hcon, conn->hcon->hdev) are chased; since the object comes from a general kmalloc cache reclaimable by sprayed data, an attacker can steer those dereferences to disclose arbitrary kernel memory.\nI:H - Execution continues writing into the freed object — conn->info_state, conn->info_ident, conn->hcon->disc_timeout, a list_add into freed conn->chan_l, and schedule_delayed_work() on a work_struct with an attacker-reclaimable function pointer — giving a write and control-flow-hijack primitive.\nA:H - The use-after-free reliably oopses the kernel in the Bluetooth rx workqueue (as KASAN reported), and mutex_lock on freed memory plus a queued timer in reclaimed slab cause panics or corruption-induced crashes."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_core.c","net/bluetooth/hci_event.c","net/bluetooth/l2cap_core.c"],"versions":[{"version":"7b064edae38d62d8587a8c574f93b53ce75ae749","lessThan":"686e05c9dbd68766c6bda5f31f7e077f36a7fb29","status":"affected","versionType":"git"},{"version":"7b064edae38d62d8587a8c574f93b53ce75ae749","lessThan":"b22346eec479a30bfa4a02ad2c551b54809694d0","status":"affected","versionType":"git"},{"version":"7b064edae38d62d8587a8c574f93b53ce75ae749","lessThan":"b90907696c30172b809aa3dd2f0caffae761e4c6","status":"affected","versionType":"git"},{"version":"7b064edae38d62d8587a8c574f93b53ce75ae749","lessThan":"78d30ce16fdf9c301bcd8b83ce613cea079cea83","status":"affected","versionType":"git"},{"version":"7b064edae38d62d8587a8c574f93b53ce75ae749","lessThan":"a1c6174e23df10b8e5770e82d63bc6e2118a3dc7","status":"affected","versionType":"git"},{"version":"7b064edae38d62d8587a8c574f93b53ce75ae749","lessThan":"333b4fd11e89b29c84c269123f871883a30be586","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_core.c","net/bluetooth/hci_event.c","net/bluetooth/l2cap_core.c"],"versions":[{"version":"3.8","status":"affected"},{"version":"0","lessThan":"3.8","status":"unaffected","versionType":"semver"},{"version":"5.15.174","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.118","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.55","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.10.14","lessThanOrEqual":"6.10.*","status":"unaffected","versionType":"semver"},{"version":"6.11.3","lessThanOrEqual":"6.11.*","status":"unaffected","versionType":"semver"},{"version":"6.12","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"5.15.174"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"6.1.118"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"6.6.55"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"6.10.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"6.11.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"6.12"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/686e05c9dbd68766c6bda5f31f7e077f36a7fb29"},{"url":"https://git.kernel.org/stable/c/b22346eec479a30bfa4a02ad2c551b54809694d0"},{"url":"https://git.kernel.org/stable/c/b90907696c30172b809aa3dd2f0caffae761e4c6"},{"url":"https://git.kernel.org/stable/c/78d30ce16fdf9c301bcd8b83ce613cea079cea83"},{"url":"https://git.kernel.org/stable/c/a1c6174e23df10b8e5770e82d63bc6e2118a3dc7"},{"url":"https://git.kernel.org/stable/c/333b4fd11e89b29c84c269123f871883a30be586"}],"title":"Bluetooth: L2CAP: Fix uaf in l2cap_connect","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2024-49950","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-10-22T13:36:31.459862Z"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-10-22T13:38:49.238Z"}},{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2025-11-03T22:23:30.897Z"}}]}}