{"id":"CVE-2026-97408","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: validate connectionless PSM length\n\nConnectionless L2CAP frames carry a two-byte PSM at the start of the\npayload","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: validate connectionless PSM length\n\nConnectionless L2CAP frames carry a two-byte PSM at the start of the\npayload.  l2cap_recv_frame() currently reads …","severity":"medium","vendor":"Linux","product":"Linux","affected":["Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 8104cd9859b6de0826cffa68adf2c1461185823b","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9448e6f693fcf1f0ac4ee648a9b2cc83bfe4a982","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 22fc1ce4e37c81d4e7aac01566ebdc232214540d","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 72e26293a231f63a856340d3a1f0f5fc29bf87e5","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3502ede8aed3c3ee1786d952a11054ac737d1a38","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < ae69dca122f6d6046a68cf40153e6e827c77ff5c","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a40a5f922546b3bd7c094d882b29177db4f2abe0","Linux 2.6.12"],"published":"2026-09-24","updated":"2026-10-03","sourceUpdated":"2026-10-03T11:17:52.943","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-97408","references":[{"url":"https://git.kernel.org/stable/c/22fc1ce4e37c81d4e7aac01566ebdc232214540d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3502ede8aed3c3ee1786d952a11054ac737d1a38","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/72e26293a231f63a856340d3a1f0f5fc29bf87e5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8104cd9859b6de0826cffa68adf2c1461185823b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9448e6f693fcf1f0ac4ee648a9b2cc83bfe4a982","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a40a5f922546b3bd7c094d882b29177db4f2abe0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ae69dca122f6d6046a68cf40153e6e827c77ff5c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97408.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-97408"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2540553"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-97408"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97408"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97408.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00173,"epssPercentile":0.06643,"ingestedAt":"2026-09-24T16:47:15.888Z","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-125"],"slug":"CVE-2026-97408","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: validate connectionless PSM length\n\nConnectionless L2CAP frames carry a two-byte PSM at the start of the\npayload.  l2cap_recv_frame() currently reads that PSM unconditionally\nafter validating only the outer L2CAP length.\n\nA malformed connectionless frame with a zero- or one-byte payload can\ntherefore make the parser read beyond the advertised skb payload and use\ntailroom bytes as part of the PSM.  A VHCI-backed QEMU reproducer\ninjected a one-byte connectionless payload and reached the unchecked\nread.\n\nReject connectionless frames that cannot contain the PSM before reading\nor pulling it.  This preserves all valid connectionless frames while\ndropping only structurally incomplete packets.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97408.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":224286,"id":"CVE-2026-97408","ts":1792325073392,"field":"cvss","old":null,"new":"5.5"},{"seq":224285,"id":"CVE-2026-97408","ts":1792325073392,"field":"severity","old":"none","new":"medium"}]}