{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-31408", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.086Z", "datePublished": "2026-04-06T07:38:20.533Z", "dateUpdated": "2026-04-06T07:38:20.533Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-04-06T07:38:20.533Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold\n\nsco_recv_frame() reads conn->sk under sco_conn_lock() but immediately\nreleases the lock without holding a reference to the socket. A concurrent\nclose() can free the socket between the lock release and the subsequent\nsk->sk_state access, resulting in a use-after-free.\n\nOther functions in the same file (sco_sock_timeout(), sco_conn_del())\ncorrectly use sco_sock_hold() to safely hold a reference under the lock.\n\nFix by using sco_sock_hold() to take a reference before releasing the\nlock, and adding sock_put() on all exit paths."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bluetooth/sco.c"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "45aaca995e4a7a05b272a58e7ab2fff4f611b8f1", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "108b81514d8f2535eb16651495cefb2250528db3", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "7197462e90b8ce15caa1ae15d4bc2bb8cd21b11e", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "e76e8f0581ef555eacc11dbb095e602fb30a5361", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "598dbba9919c5e36c54fe1709b557d64120cb94b", "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/sco.c"], "versions": [{"version": "2.6.12", "status": "affected"}, {"version": "0", "lessThan": "2.6.12", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.131", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.80", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.21", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.11", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0-rc6", "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": "2.6.12", "versionEndExcluding": "6.6.131"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.12.80"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.18.21"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.19.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "7.0-rc6"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/45aaca995e4a7a05b272a58e7ab2fff4f611b8f1"}, {"url": "https://git.kernel.org/stable/c/108b81514d8f2535eb16651495cefb2250528db3"}, {"url": "https://git.kernel.org/stable/c/7197462e90b8ce15caa1ae15d4bc2bb8cd21b11e"}, {"url": "https://git.kernel.org/stable/c/e76e8f0581ef555eacc11dbb095e602fb30a5361"}, {"url": "https://git.kernel.org/stable/c/598dbba9919c5e36c54fe1709b557d64120cb94b"}], "title": "Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold\n\nsco_recv_frame() reads conn->sk under sco_conn_lock() but immediately\nreleases the lock without holding a reference to the socket. A concurrent\nclose() can free the socket between the lock release and the subsequent\nsk->sk_state access, resulting in a use-after-free.\n\nOther functions in the same file (sco_sock_timeout(), sco_conn_del())\ncorrectly use sco_sock_hold() to safely hold a reference under the lock.\n\nFix by using sco_sock_hold() to take a reference before releasing the\nlock, and adding sock_put() on all exit paths."}], "id": "CVE-2026-31408", "lastModified": "2026-04-07T13:20:35.010", "metrics": {}, "published": "2026-04-06T08:16:38.757", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/108b81514d8f2535eb16651495cefb2250528db3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/45aaca995e4a7a05b272a58e7ab2fff4f611b8f1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/598dbba9919c5e36c54fe1709b557d64120cb94b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7197462e90b8ce15caa1ae15d4bc2bb8cd21b11e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e76e8f0581ef555eacc11dbb095e602fb30a5361"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold", "id": "2455334", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2455334"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-911", "details": ["A flaw was found in the Linux kernel's Bluetooth SCO (Synchronous Connection-Oriented) protocol implementation. The `sco_recv_frame()` function fails to properly hold a reference to a socket after releasing a lock. This oversight allows a concurrent operation to free the socket while it is still being accessed, leading to a use-after-free vulnerability. A local attacker could potentially exploit this to cause memory corruption or a denial of service."], "name": "CVE-2026-31408", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31408\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31408\nhttps://lore.kernel.org/linux-cve-announce/2026040629-CVE-2026-31408-9f0f@gregkh/T"], "statement": "Under `sco_conn_lock`, the code read `conn->sk` then dropped the lock without `sco_sock_hold()`, so `close()` could race and free the socket before `sk->sk_state` use. The fix mirrors other SCO helpers. Adjacent Bluetooth is involved; impact is UAF and likely crash.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,45aaca995e4a7a05b272a58e7ab2fff4f611b8f1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,108b81514d8f2535eb16651495cefb2250528db3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,7197462e90b8ce15caa1ae15d4bc2bb8cd21b11e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,e76e8f0581ef555eacc11dbb095e602fb30a5361)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,598dbba9919c5e36c54fe1709b557d64120cb94b)"}}], "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": "semver", "value": "2.6.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.131,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.80,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.21,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.11,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0-rc6,*]"}}], "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"}], "analysis": {"en": {"generated_at": "2026-04-07T09:55:01.789105+00:00", "value": {"mitigation_remediation": ["Apply a Linux kernel update that includes the sco_recv_frame fix", "Verify the running kernel version is newer than the patch contains", "After updating, restart the system to complete the kernel replacement"], "summary": {"action": "Apply Patch", "impact": "Use-After-Free in Bluetooth SCO socket handling"}, "threat_synthesis": {"affected_systems": "All Linux kernel implementations that contain the vulnerable sco_recv_frame() routine. No specific kernel versions are listed in the CNA data, so any kernel prior to the patch containing this fix is susceptible.", "description_and_impact": "A concurrent close operation can free the socket after the lock in sco_recv_frame() is released but before the socket state is accessed, causing a use-after-free. This memory corruption may lead to kernel crashes or permit an attacker to execute arbitrary kernel code, potentially escalating privileges. The vulnerability resides in the Bluetooth SCO subsystem and requires a malicious or malformed SCO frame transmitted during a connection.", "risk_and_exploitability": "The CVSS score of 5.5 indicates moderate severity, while an EPSS score of less than 1% suggests low likelihood of exploitation. The vulnerability is not in the CISA KEV catalog. Based on the description, the likely attack vector is a Bluetooth device that initiates or sends SCO frames; an attacker must be able to connect or interfere with a target\u2019s Bluetooth stack to trigger the use-after-free."}}}}, "created": "2026-04-06T20:14:54.331634+00:00", "updated": "2026-04-08T19:52:36.184008+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}