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vuln-cve/data/2022/49xxx/CVE-2022-49910.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2022-49910",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2025-05-01T14:05:17.247Z",
"datePublished": "2025-05-01T14:10:53.010Z",
"dateUpdated": "2026-08-05T08:56:39.541Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T08:56:39.541Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix use-after-free caused by l2cap_reassemble_sdu\n\nFix the race condition between the following two flows that run in\nparallel:\n\n1. l2cap_reassemble_sdu -> chan->ops->recv (l2cap_sock_recv_cb) ->\n __sock_queue_rcv_skb.\n\n2. bt_sock_recvmsg -> skb_recv_datagram, skb_free_datagram.\n\nAn SKB can be queued by the first flow and immediately dequeued and\nfreed by the second flow, therefore the callers of l2cap_reassemble_sdu\ncan't use the SKB after that function returns. However, some places\ncontinue accessing struct l2cap_ctrl that resides in the SKB's CB for a\nshort time after l2cap_reassemble_sdu returns, leading to a\nuse-after-free condition (the stack trace is below, line numbers for\nkernel 5.19.8).\n\nFix it by keeping a local copy of struct l2cap_ctrl.\n\nBUG: KASAN: use-after-free in l2cap_rx_state_recv (net/bluetooth/l2cap_core.c:6906) bluetooth\nRead of size 1 at addr ffff88812025f2f0 by task kworker/u17:3/43169\n\nWorkqueue: hci0 hci_rx_work [bluetooth]\nCall Trace:\n <TASK>\n dump_stack_lvl (lib/dump_stack.c:107 (discriminator 4))\n print_report.cold (mm/kasan/report.c:314 mm/kasan/report.c:429)\n ? l2cap_rx_state_recv (net/bluetooth/l2cap_core.c:6906) bluetooth\n kasan_report (mm/kasan/report.c:162 mm/kasan/report.c:493)\n ? l2cap_rx_state_recv (net/bluetooth/l2cap_core.c:6906) bluetooth\n l2cap_rx_state_recv (net/bluetooth/l2cap_core.c:6906) bluetooth\n l2cap_rx (net/bluetooth/l2cap_core.c:7236 net/bluetooth/l2cap_core.c:7271) bluetooth\n ret_from_fork (arch/x86/entry/entry_64.S:306)\n </TASK>\n\nAllocated by task 43169:\n kasan_save_stack (mm/kasan/common.c:39)\n __kasan_slab_alloc (mm/kasan/common.c:45 mm/kasan/common.c:436 mm/kasan/common.c:469)\n kmem_cache_alloc_node (mm/slab.h:750 mm/slub.c:3243 mm/slub.c:3293)\n __alloc_skb (net/core/skbuff.c:414)\n l2cap_recv_frag (./include/net/bluetooth/bluetooth.h:425 net/bluetooth/l2cap_core.c:8329) bluetooth\n l2cap_recv_acldata (net/bluetooth/l2cap_core.c:8442) bluetooth\n hci_rx_work (net/bluetooth/hci_core.c:3642 net/bluetooth/hci_core.c:3832) bluetooth\n process_one_work (kernel/workqueue.c:2289)\n worker_thread (./include/linux/list.h:292 kernel/workqueue.c:2437)\n kthread (kernel/kthread.c:376)\n ret_from_fork (arch/x86/entry/entry_64.S:306)\n\nFreed by task 27920:\n kasan_save_stack (mm/kasan/common.c:39)\n kasan_set_track (mm/kasan/common.c:45)\n kasan_set_free_info (mm/kasan/generic.c:372)\n ____kasan_slab_free (mm/kasan/common.c:368 mm/kasan/common.c:328)\n slab_free_freelist_hook (mm/slub.c:1780)\n kmem_cache_free (mm/slub.c:3536 mm/slub.c:3553)\n skb_free_datagram (./include/net/sock.h:1578 ./include/net/sock.h:1639 net/core/datagram.c:323)\n bt_sock_recvmsg (net/bluetooth/af_bluetooth.c:295) bluetooth\n l2cap_sock_recvmsg (net/bluetooth/l2cap_sock.c:1212) bluetooth\n sock_read_iter (net/socket.c:1087)\n new_sync_read (./include/linux/fs.h:2052 fs/read_write.c:401)\n vfs_read (fs/read_write.c:482)\n ksys_read (fs/read_write.c:620)\n do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120)"
}
],
"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 bug is reached by processing Bluetooth ACL/L2CAP I-frames in hci_rx_work → l2cap_recv_acldata → l2cap_data_rcv → l2cap_rx_state_recv/l2cap_stream_rx, which requires an attacker on the same Bluetooth segment.\nAC:L - An adjacent peer can reliably drive the receive path by sending ERTM/streaming I-frames on an established channel; on SMP, a normal blocking socket reader frees the skb in the race window the attacker creates, and a local app plus attacker-controlled peer can control both sides.\nPR:N - Exploitation is via unauthenticated Bluetooth L2CAP data handling in the kernel RX path; the adjacent attacker needs no privileges on the victim host (consistent with other Bluetooth L2CAP UAF scores).\nUI:N - No additional user action is required beyond an active L2CAP ERTM/streaming channel (for example RFCOMM or an already-paired/auto-connecting peer whose socket is being read by userspace).\nS:U - This is in-kernel heap UAF within the Bluetooth stack and does not cross a separate security authority such as a VM or IOMMU boundary.\nC:H - Use-after-free of the skb (including cb-resident l2cap_ctrl) enables heap reuse and arbitrary kernel memory disclosure primitives.\nI:H - Post-free use of control feeds l2cap_retransmit_all and channel sequence updates, so the UAF can be turned into heap corruption and control-flow hijacking.\nA:H - The UAF is a demonstrated KASAN use-after-free on the HCI RX workqueue and can cause kernel oops/panic even without full exploitation."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/bluetooth/l2cap_core.c"
],
"versions": [
{
"version": "4b51dae96731c9d82f5634e75ac7ffd3b9c1b060",
"lessThan": "dc30e05bb18852303084430c03ca76e69257d9ea",
"status": "affected",
"versionType": "git"
},
{
"version": "4b51dae96731c9d82f5634e75ac7ffd3b9c1b060",
"lessThan": "03af22e23b96fb7ef75fb7885407ef457e8b403d",
"status": "affected",
"versionType": "git"
},
{
"version": "4b51dae96731c9d82f5634e75ac7ffd3b9c1b060",
"lessThan": "6c7407bfbeafc80a04e6eaedcf34d378532a04f2",
"status": "affected",
"versionType": "git"
},
{
"version": "4b51dae96731c9d82f5634e75ac7ffd3b9c1b060",
"lessThan": "4cd094fd5d872862ca278e15b9b51b07e915ef3f",
"status": "affected",
"versionType": "git"
},
{
"version": "4b51dae96731c9d82f5634e75ac7ffd3b9c1b060",
"lessThan": "cb1c012099ef5904cd468bdb8d6fcdfdd9bcb569",
"status": "affected",
"versionType": "git"
},
{
"version": "4b51dae96731c9d82f5634e75ac7ffd3b9c1b060",
"lessThan": "8278a87bb1eeea94350d675ef961ee5a03341fde",
"status": "affected",
"versionType": "git"
},
{
"version": "4b51dae96731c9d82f5634e75ac7ffd3b9c1b060",
"lessThan": "9a04161244603f502c6e453913e51edd59cb70c1",
"status": "affected",
"versionType": "git"
},
{
"version": "4b51dae96731c9d82f5634e75ac7ffd3b9c1b060",
"lessThan": "3aff8aaca4e36dc8b17eaa011684881a80238966",
"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/l2cap_core.c"
],
"versions": [
{
"version": "3.6",
"status": "affected"
},
{
"version": "0",
"lessThan": "3.6",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "4.9.333",
"lessThanOrEqual": "4.9.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "4.14.299",
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "4.19.265",
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.4.224",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.154",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.78",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.0.8",
"lessThanOrEqual": "6.0.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1",
"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": "3.6",
"versionEndExcluding": "4.9.333"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.6",
"versionEndExcluding": "4.14.299"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.6",
"versionEndExcluding": "4.19.265"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.6",
"versionEndExcluding": "5.4.224"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.6",
"versionEndExcluding": "5.10.154"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.6",
"versionEndExcluding": "5.15.78"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.6",
"versionEndExcluding": "6.0.8"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.6",
"versionEndExcluding": "6.1"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/dc30e05bb18852303084430c03ca76e69257d9ea"
},
{
"url": "https://git.kernel.org/stable/c/03af22e23b96fb7ef75fb7885407ef457e8b403d"
},
{
"url": "https://git.kernel.org/stable/c/6c7407bfbeafc80a04e6eaedcf34d378532a04f2"
},
{
"url": "https://git.kernel.org/stable/c/4cd094fd5d872862ca278e15b9b51b07e915ef3f"
},
{
"url": "https://git.kernel.org/stable/c/cb1c012099ef5904cd468bdb8d6fcdfdd9bcb569"
},
{
"url": "https://git.kernel.org/stable/c/8278a87bb1eeea94350d675ef961ee5a03341fde"
},
{
"url": "https://git.kernel.org/stable/c/9a04161244603f502c6e453913e51edd59cb70c1"
},
{
"url": "https://git.kernel.org/stable/c/3aff8aaca4e36dc8b17eaa011684881a80238966"
}
],
"title": "Bluetooth: L2CAP: Fix use-after-free caused by l2cap_reassemble_sdu",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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