CVE-2022-50386

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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` \u2192 `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", 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"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": 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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"}], "id": "CVE-2022-50386", "lastModified": "2026-08-04T10:18:13.947", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.1, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.1, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2022-50386", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-01-14T18:49:08.856293Z", "version": "2.0.3"}}]}, "published": "2025-09-18T14:15:37.480", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0c108cf3ad386e0084277093b55a351c49e0be27"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/11e40d6c0823f699d8ad501e48d1c3ae4be386cd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/15fc21695eb606bdc5d483b92118ee42610a952d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/35fcbc4243aad7e7d020b7c1dfb14bb888b20a4f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6ffde6e03085874ae22263ff4cef4869f797e84f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7d6f9cb24d2b2f6b6370eac074e2e6b1bafdad45"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/843fc4e386dd84b806a7f07fb062d8c3a44e5364"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d1e894f950ad48897d1a7cb05909ea29d8c3810e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d91fc2836562f299f34e361e089e9fe154da4f73"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: Bluetooth: L2CAP: Fix user-after-free", "id": "2396431", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2396431"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2022-50386", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-09-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-50386\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-50386\nhttps://lore.kernel.org/linux-cve-announce/2025091852-CVE-2022-50386-07d7@gregkh/T"], "threat_severity": "Important"}

{"created": "2025-09-19T09:36:48.172360+00:00", "updated": "2025-09-19T09:36:48.172416+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}