{"id":"CVE-2026-31512","state":"PUBLISHED","title":"Bluetooth: L2CAP: Validate PDU length before reading SDU length in l2cap_ecred_data_rcv()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Validate PDU length before reading SDU length in l2cap_ecred_data_rcv()\n\nl2cap_ecred_data_rcv() reads the SDU length field from skb->data using\nget_unaligned_le16() without first verifying that skb contains at least\nL2CAP_SDULEN_SIZE (2) bytes. When skb->len is less than 2, this reads\npast the valid data in the skb.\n\nThe ERTM reassembly path correctly calls pskb_may_pull() before reading\nthe SDU length (l2cap_reassemble_sdu, L2CAP_SAR_START case). Apply the\nsame validation to the Enhanced Credit Based Flow Control data path.","publishedAt":"2026-04-22T13:54:30.171Z","updatedAt":"2026-05-11T22:10:13.614Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"aac23bf636593cc2d67144aed373a46a1a5f76b1","status":"affected","lessThan":"cef09691cfb61f6c91cc27c3d69634f81c8ab949","versionType":"git"},{"version":"aac23bf636593cc2d67144aed373a46a1a5f76b1","status":"affected","lessThan":"3340be2bafdcc806f048273ea6d8e82a6597aa1b","versionType":"git"},{"version":"aac23bf636593cc2d67144aed373a46a1a5f76b1","status":"affected","lessThan":"e47315b84d0eb188772c3ff5cf073cdbdefca6b4","versionType":"git"},{"version":"aac23bf636593cc2d67144aed373a46a1a5f76b1","status":"affected","lessThan":"477ad4976072056c348937e94f24583321938df4","versionType":"git"},{"version":"aac23bf636593cc2d67144aed373a46a1a5f76b1","status":"affected","lessThan":"40c7f7eea2f4d9cb0b3e924254c8c9053372168f","versionType":"git"},{"version":"aac23bf636593cc2d67144aed373a46a1a5f76b1","status":"affected","lessThan":"8c96f3bd4ae0802db90630be8e9851827e9c9209","versionType":"git"},{"version":"aac23bf636593cc2d67144aed373a46a1a5f76b1","status":"affected","lessThan":"5ad981249be52f5e4e92e0e97b436b569071cb86","versionType":"git"},{"version":"aac23bf636593cc2d67144aed373a46a1a5f76b1","status":"affected","lessThan":"c65bd945d1c08c3db756821b6bf9f1c4a77b29c6","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/l2cap_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.14","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.168","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.131","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.80","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.21","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.11","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/l2cap_core.c"]}],"references":["https://git.kernel.org/stable/c/cef09691cfb61f6c91cc27c3d69634f81c8ab949","https://git.kernel.org/stable/c/3340be2bafdcc806f048273ea6d8e82a6597aa1b","https://git.kernel.org/stable/c/e47315b84d0eb188772c3ff5cf073cdbdefca6b4","https://git.kernel.org/stable/c/477ad4976072056c348937e94f24583321938df4","https://git.kernel.org/stable/c/40c7f7eea2f4d9cb0b3e924254c8c9053372168f","https://git.kernel.org/stable/c/8c96f3bd4ae0802db90630be8e9851827e9c9209","https://git.kernel.org/stable/c/5ad981249be52f5e4e92e0e97b436b569071cb86","https://git.kernel.org/stable/c/c65bd945d1c08c3db756821b6bf9f1c4a77b29c6"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/31xxx/CVE-2026-31512.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31512","state":"PUBLISHED","datePublished":"2026-04-22T13:54:30.171Z","dateUpdated":"2026-05-11T22:10:13.614Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-03-09T15:48:24.107Z"},"containers":{"cna":{"title":"Bluetooth: L2CAP: Validate PDU length before reading SDU length in l2cap_ecred_data_rcv()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Validate PDU length before reading SDU length in l2cap_ecred_data_rcv()\n\nl2cap_ecred_data_rcv() reads the SDU length field from skb->data using\nget_unaligned_le16() without first verifying that skb contains at least\nL2CAP_SDULEN_SIZE (2) bytes. When skb->len is less than 2, this reads\npast the valid data in the skb.\n\nThe ERTM reassembly path correctly calls pskb_may_pull() before reading\nthe SDU length (l2cap_reassemble_sdu, L2CAP_SAR_START case). Apply the\nsame validation to the Enhanced Credit Based Flow Control data path."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"aac23bf636593cc2d67144aed373a46a1a5f76b1","status":"affected","lessThan":"cef09691cfb61f6c91cc27c3d69634f81c8ab949","versionType":"git"},{"version":"aac23bf636593cc2d67144aed373a46a1a5f76b1","status":"affected","lessThan":"3340be2bafdcc806f048273ea6d8e82a6597aa1b","versionType":"git"},{"version":"aac23bf636593cc2d67144aed373a46a1a5f76b1","status":"affected","lessThan":"e47315b84d0eb188772c3ff5cf073cdbdefca6b4","versionType":"git"},{"version":"aac23bf636593cc2d67144aed373a46a1a5f76b1","status":"affected","lessThan":"477ad4976072056c348937e94f24583321938df4","versionType":"git"},{"version":"aac23bf636593cc2d67144aed373a46a1a5f76b1","status":"affected","lessThan":"40c7f7eea2f4d9cb0b3e924254c8c9053372168f","versionType":"git"},{"version":"aac23bf636593cc2d67144aed373a46a1a5f76b1","status":"affected","lessThan":"8c96f3bd4ae0802db90630be8e9851827e9c9209","versionType":"git"},{"version":"aac23bf636593cc2d67144aed373a46a1a5f76b1","status":"affected","lessThan":"5ad981249be52f5e4e92e0e97b436b569071cb86","versionType":"git"},{"version":"aac23bf636593cc2d67144aed373a46a1a5f76b1","status":"affected","lessThan":"c65bd945d1c08c3db756821b6bf9f1c4a77b29c6","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/l2cap_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.14","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.168","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.131","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.80","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.21","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.11","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/l2cap_core.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/cef09691cfb61f6c91cc27c3d69634f81c8ab949"},{"url":"https://git.kernel.org/stable/c/3340be2bafdcc806f048273ea6d8e82a6597aa1b"},{"url":"https://git.kernel.org/stable/c/e47315b84d0eb188772c3ff5cf073cdbdefca6b4"},{"url":"https://git.kernel.org/stable/c/477ad4976072056c348937e94f24583321938df4"},{"url":"https://git.kernel.org/stable/c/40c7f7eea2f4d9cb0b3e924254c8c9053372168f"},{"url":"https://git.kernel.org/stable/c/8c96f3bd4ae0802db90630be8e9851827e9c9209"},{"url":"https://git.kernel.org/stable/c/5ad981249be52f5e4e92e0e97b436b569071cb86"},{"url":"https://git.kernel.org/stable/c/c65bd945d1c08c3db756821b6bf9f1c4a77b29c6"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:10:13.614Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"6.1.168"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"6.6.131"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"6.12.80"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"6.18.21"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"6.19.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}