{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64557", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.796Z", "datePublished": "2026-07-29T08:01:47.462Z", "dateUpdated": "2026-07-29T08:01:47.462Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-29T08:01:47.462Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix use-after-free in l2cap_sock_new_connection_cb()\n\nl2cap_sock_new_connection_cb() returned l2cap_pi(sk)->chan after\nrelease_sock(parent). Once the parent lock is dropped the newly\nenqueued child socket sk is reachable via the accept queue, so another\ntask can accept and free it before the callback dereferences sk,\nresulting in a use-after-free.\n\nRework the ->new_connection() op so the core, rather than the callback,\nowns the child channel's lifetime. The op now receives a pre-allocated\nnew_chan and returns an errno instead of allocating and returning a\nchannel. l2cap_new_connection() allocates the child channel and links\nit into the conn list via __l2cap_chan_add() before invoking the\ncallback, so the conn-list reference keeps the channel alive once\nrelease_sock(parent) exposes the socket to other tasks.\n\nChannel configuration that was duplicated in l2cap_sock_init() and the\nvarious new_connection callbacks is consolidated into\nl2cap_chan_set_defaults(), which now inherits from the parent channel\nwhen one is supplied."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/bluetooth/l2cap.h", "net/bluetooth/6lowpan.c", "net/bluetooth/l2cap_core.c", "net/bluetooth/l2cap_sock.c", "net/bluetooth/smp.c"], "versions": [{"version": "8ffb929098a56939ac71509302eeab5b207bf262", "lessThan": "b39298044e5534612511a2ff5de03ba5f6e7a820", "status": "affected", "versionType": "git"}, {"version": "8ffb929098a56939ac71509302eeab5b207bf262", "lessThan": "8c37e4338c801ebb8cee52436c01c41e009f6e87", "status": "affected", "versionType": "git"}, {"version": "8ffb929098a56939ac71509302eeab5b207bf262", "lessThan": "84e718b6a814edc84159361f9f454a4e92ae91ae", "status": "affected", "versionType": "git"}, {"version": "8ffb929098a56939ac71509302eeab5b207bf262", "lessThan": "36da806f7fbaee56ad9e81859deec203f9728700", "status": "affected", "versionType": "git"}, {"version": "8ffb929098a56939ac71509302eeab5b207bf262", "lessThan": "733e76e74e406c1d1ddc7369420dd8a47f48bb8a", "status": "affected", "versionType": "git"}, {"version": "8ffb929098a56939ac71509302eeab5b207bf262", "lessThan": "6fef032af0092ed5ccb767239a9ac1bc38c08a40", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/bluetooth/l2cap.h", "net/bluetooth/6lowpan.c", "net/bluetooth/l2cap_core.c", "net/bluetooth/l2cap_sock.c", "net/bluetooth/smp.c"], "versions": [{"version": "3.13", "status": "affected"}, {"version": "0", "lessThan": "3.13", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc3", "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": "3.13", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "7.2-rc3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/b39298044e5534612511a2ff5de03ba5f6e7a820"}, {"url": "https://git.kernel.org/stable/c/8c37e4338c801ebb8cee52436c01c41e009f6e87"}, {"url": "https://git.kernel.org/stable/c/84e718b6a814edc84159361f9f454a4e92ae91ae"}, {"url": "https://git.kernel.org/stable/c/36da806f7fbaee56ad9e81859deec203f9728700"}, {"url": "https://git.kernel.org/stable/c/733e76e74e406c1d1ddc7369420dd8a47f48bb8a"}, {"url": "https://git.kernel.org/stable/c/6fef032af0092ed5ccb767239a9ac1bc38c08a40"}], "title": "Bluetooth: L2CAP: Fix use-after-free in l2cap_sock_new_connection_cb()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{}

{"bugzilla": {"description": "kernel: Bluetooth: L2CAP: Fix use-after-free in l2cap_sock_new_connection_cb()", "id": "2508320", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2508320"}, "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"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's Bluetooth L2CAP component. A race condition exists during the handling of new Bluetooth connections, where a newly created socket can be prematurely freed by another process before a callback function completes its operation. This use-after-free vulnerability could allow a local attacker to potentially execute arbitrary code or cause a system crash (Denial of Service)."], "name": "CVE-2026-64557", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not 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": "2026-07-29T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64557\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64557\nhttps://lore.kernel.org/linux-cve-announce/2026072941-CVE-2026-64557-4d87@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8ffb929098a56939ac71509302eeab5b207bf262,b39298044e5534612511a2ff5de03ba5f6e7a820)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8ffb929098a56939ac71509302eeab5b207bf262,8c37e4338c801ebb8cee52436c01c41e009f6e87)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8ffb929098a56939ac71509302eeab5b207bf262,84e718b6a814edc84159361f9f454a4e92ae91ae)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8ffb929098a56939ac71509302eeab5b207bf262,36da806f7fbaee56ad9e81859deec203f9728700)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8ffb929098a56939ac71509302eeab5b207bf262,733e76e74e406c1d1ddc7369420dd8a47f48bb8a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8ffb929098a56939ac71509302eeab5b207bf262,6fef032af0092ed5ccb767239a9ac1bc38c08a40)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.13"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.13)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.178,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc3,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-29T12:15:03.892924+00:00", "updated": "2026-07-29T12:15:03.892984+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}