{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31513","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-03-09T15:48:24.107Z","datePublished":"2026-04-22T13:54:30.835Z","dateUpdated":"2026-05-11T22:10:14.922Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:10:14.922Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix stack-out-of-bounds read in l2cap_ecred_conn_req\n\nSyzbot reported a KASAN stack-out-of-bounds read in l2cap_build_cmd()\nthat is triggered by a malformed Enhanced Credit Based Connection Request.\n\nThe vulnerability stems from l2cap_ecred_conn_req(). The function allocates\na local stack buffer (`pdu`) designed to hold a maximum of 5 Source Channel\nIDs (SCIDs), totaling 18 bytes. When an attacker sends a request with more\nthan 5 SCIDs, the function calculates `rsp_len` based on this unvalidated\n`cmd_len` before checking if the number of SCIDs exceeds\nL2CAP_ECRED_MAX_CID.\n\nIf the SCID count is too high, the function correctly jumps to the\n`response` label to reject the packet, but `rsp_len` retains the\nattacker's oversized value. Consequently, l2cap_send_cmd() is instructed\nto read past the end of the 18-byte `pdu` buffer, triggering a\nKASAN panic.\n\nFix this by moving the assignment of `rsp_len` to after the `num_scid`\nboundary check. If the packet is rejected, `rsp_len` will safely\nremain 0, and the error response will only read the 8-byte base header\nfrom the stack."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","baseScore":8.1,"baseSeverity":"HIGH"}}],"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":"935f324e4b2461df2cf7f02b4195082b4304c708","lessThan":"c8e1a27edb8b4e5afb56b384acd7b6c2dec1b7cc","status":"affected","versionType":"git"},{"version":"e981a9392800ce2c5bca196a6ab2c55e9370efaa","lessThan":"5b35f8211a913cfe7ab9d54fa36a272d2059a588","status":"affected","versionType":"git"},{"version":"f3fdf2e7276a3edc5df55454275da20eac186970","lessThan":"a3d9c50d69785ae02e153f000da1b5fd6dbfdf1b","status":"affected","versionType":"git"},{"version":"c28d2bff70444a85b3b86aaf241ece9408c7858c","lessThan":"9d87cb22195b2c67405f5485d525190747ad5493","status":"affected","versionType":"git"}]},{"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":"6.12.75","lessThan":"6.12.80","status":"affected","versionType":"semver"},{"version":"6.18.16","lessThan":"6.18.21","status":"affected","versionType":"semver"},{"version":"6.19.6","lessThan":"6.19.11","status":"affected","versionType":"semver"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.75","versionEndExcluding":"6.12.80"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18.16","versionEndExcluding":"6.18.21"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19.6","versionEndExcluding":"6.19.11"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/c8e1a27edb8b4e5afb56b384acd7b6c2dec1b7cc"},{"url":"https://git.kernel.org/stable/c/5b35f8211a913cfe7ab9d54fa36a272d2059a588"},{"url":"https://git.kernel.org/stable/c/a3d9c50d69785ae02e153f000da1b5fd6dbfdf1b"},{"url":"https://git.kernel.org/stable/c/9d87cb22195b2c67405f5485d525190747ad5493"}],"title":"Bluetooth: L2CAP: Fix stack-out-of-bounds read in l2cap_ecred_conn_req","x_generator":{"engine":"bippy-1.2.0"}}}}