{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50386", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-09-17T14:53:06.997Z", "datePublished": "2025-09-18T13:33:07.191Z", "dateUpdated": "2026-08-05T08:58:30.414Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:58:30.414Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix user-after-free\n\nThis uses l2cap_chan_hold_unless_zero() after calling\n__l2cap_get_chan_blah() to prevent the following trace:\n\nBluetooth: l2cap_core.c:static void l2cap_chan_destroy(struct kref\n*kref)\nBluetooth: chan 0000000023c4974d\nBluetooth: parent 00000000ae861c08\n==================================================================\nBUG: KASAN: use-after-free in __mutex_waiter_is_first\nkernel/locking/mutex.c:191 [inline]\nBUG: KASAN: use-after-free in __mutex_lock_common\nkernel/locking/mutex.c:671 [inline]\nBUG: KASAN: use-after-free in __mutex_lock+0x278/0x400\nkernel/locking/mutex.c:729\nRead of size 8 at addr ffff888006a49b08 by task kworker/u3:2/389" } ], "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 in BR/EDR L2CAP signaling (`l2cap_connect_create_rsp`) reached via ACL frames from a Bluetooth peer (`l2cap_recv_acldata` → `l2cap_sig_channel`), so exploitation requires adjacent-network Bluetooth proximity.\nAC:L - A remote peer can send L2CAP_CONN_RSP/CREATE_CHAN_RSP while concurrently forcing channel teardown (disconnect/link drop), controlling both sides of the UAF race, so success does not depend on conditions outside attacker influence.\nPR:N - L2CAP connect responses are processed on the signaling CID for established ACL links at default BT_SECURITY_LOW/SDP without authentication or local privileges on the victim host.\nUI:N - No additional victim action is required beyond ordinary Bluetooth connection activity; a malicious adjacent device can trigger the path during normal connect/reconnect flows.\nS:U - This is a standard in-kernel L2CAP channel UAF that enables privilege impact only within the same kernel security authority, not a boundary crossing such as VM/IOMMU escape.\nC:H - Use-after-free of the `l2cap_chan` object allows reclaim and attacker-controlled contents, which can be leveraged for arbitrary kernel memory disclosure.\nI:H - The same UAF enables heap spray and corruption of the freed channel/mutex-related state, providing a path to arbitrary write and control-flow hijacking in the kernel.\nA:H - The KASAN report shows a kernel UAF during `l2cap_chan_lock`, which can oops/panic the kernel even when not fully exploited for code execution." } ] } ], "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": "3df91ea20e744344100b10ae69a17211fcf5b207", "lessThan": "11e40d6c0823f699d8ad501e48d1c3ae4be386cd", "status": "affected", "versionType": "git" }, { "version": "3df91ea20e744344100b10ae69a17211fcf5b207", "lessThan": "843fc4e386dd84b806a7f07fb062d8c3a44e5364", "status": "affected", "versionType": "git" }, { "version": "3df91ea20e744344100b10ae69a17211fcf5b207", "lessThan": "d91fc2836562f299f34e361e089e9fe154da4f73", "status": "affected", "versionType": "git" }, { "version": "3df91ea20e744344100b10ae69a17211fcf5b207", "lessThan": "7d6f9cb24d2b2f6b6370eac074e2e6b1bafdad45", "status": "affected", "versionType": "git" }, { "version": "3df91ea20e744344100b10ae69a17211fcf5b207", "lessThan": "0c108cf3ad386e0084277093b55a351c49e0be27", "status": "affected", "versionType": "git" }, { "version": "3df91ea20e744344100b10ae69a17211fcf5b207", "lessThan": "d1e894f950ad48897d1a7cb05909ea29d8c3810e", "status": "affected", "versionType": "git" }, { "version": "3df91ea20e744344100b10ae69a17211fcf5b207", "lessThan": "6ffde6e03085874ae22263ff4cef4869f797e84f", "status": "affected", "versionType": "git" }, { "version": "3df91ea20e744344100b10ae69a17211fcf5b207", "lessThan": "15fc21695eb606bdc5d483b92118ee42610a952d", "status": "affected", "versionType": "git" }, { "version": "3df91ea20e744344100b10ae69a17211fcf5b207", "lessThan": "35fcbc4243aad7e7d020b7c1dfb14bb888b20a4f", "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": "3.4", "status": "affected" }, { "version": "0", "lessThan": "3.4", "status": "unaffected", "versionType": "semver" }, { "version": "4.9.331", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.296", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.262", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.220", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.150", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.75", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19.17", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.3", "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": "3.4", "versionEndExcluding": "4.9.331" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "4.14.296" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "4.19.262" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "5.4.220" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "5.10.150" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "5.15.75" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "5.19.17" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "6.0.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "6.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/11e40d6c0823f699d8ad501e48d1c3ae4be386cd" }, { "url": "https://git.kernel.org/stable/c/843fc4e386dd84b806a7f07fb062d8c3a44e5364" }, { "url": "https://git.kernel.org/stable/c/d91fc2836562f299f34e361e089e9fe154da4f73" }, { "url": "https://git.kernel.org/stable/c/7d6f9cb24d2b2f6b6370eac074e2e6b1bafdad45" }, { "url": "https://git.kernel.org/stable/c/0c108cf3ad386e0084277093b55a351c49e0be27" }, { "url": "https://git.kernel.org/stable/c/d1e894f950ad48897d1a7cb05909ea29d8c3810e" }, { "url": "https://git.kernel.org/stable/c/6ffde6e03085874ae22263ff4cef4869f797e84f" }, { "url": "https://git.kernel.org/stable/c/15fc21695eb606bdc5d483b92118ee42610a952d" }, { "url": "https://git.kernel.org/stable/c/35fcbc4243aad7e7d020b7c1dfb14bb888b20a4f" } ], "title": "Bluetooth: L2CAP: Fix user-after-free", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 8, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2022-50386", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-01-14T18:49:08.856293Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-14T18:53:04.692Z" } } ] } }