{"api_version":"1","generated_at":"2026-10-01T18:35:11+00:00","cve":"CVE-2026-98107","urls":{"html":"https://cve.report/CVE-2026-98107","api":"https://cve.report/api/cve/CVE-2026-98107.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98107","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98107"},"summary":{"title":"Bluetooth: L2CAP: fix out-of-bounds write in l2cap_ecred_connect","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: fix out-of-bounds write in l2cap_ecred_connect\n\nl2cap_chan_connect() tries to ensure there are no more than\nL2CAP_ECRED_CONN_SCID_MAX pending ECRED channels, so they fit in the\nsame L2CAP_ECRED_CONN_REQ that l2cap_ecred_connect() constructs.\n\nHowever, the check only counts deferred channels.  If 6 L2CAP sockets\nare connected at the same time in order DDDDND (D=deferred,\nN=non-deferred), the last can bump the total to max+1.  It results to\none __le16 written out of bounds of the scid array, and an invalid\nECRED_CONN_REQ being sent.\n\nFix by leaving room for the non-deferred pending ECRED channels in the\ncounting in l2cap_chan_connect(), so the limit can't be exceeded.\n\nMove counting under same critical section where the channel is added.\nAlthough race conditions involving this appear unreachable, it's easier\nto see.\n\nAlso add WARN_ON_ONCE check in l2cap_ecred_defer_connect() to make this\nless brittle.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-25 11:17:41","updated_at":"2026-09-30 14:10:59"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/56c2b5831d39dc84aad2573dc3e197af1a872a05","name":"https://git.kernel.org/stable/c/56c2b5831d39dc84aad2573dc3e197af1a872a05","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/df8c3af6132640da4788e96a02d653e642059803","name":"https://git.kernel.org/stable/c/df8c3af6132640da4788e96a02d653e642059803","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ce0927eb3ee2939fab5ce3f9334bfd2fafb38481","name":"https://git.kernel.org/stable/c/ce0927eb3ee2939fab5ce3f9334bfd2fafb38481","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6da5c0331fc3ef0c7b8df8269523fc3b2cce1e65","name":"https://git.kernel.org/stable/c/6da5c0331fc3ef0c7b8df8269523fc3b2cce1e65","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98107","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98107","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected da49b602f7f75ccc91386e1274b3ef71676cd092 ce0927eb3ee2939fab5ce3f9334bfd2fafb38481 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected da49b602f7f75ccc91386e1274b3ef71676cd092 6da5c0331fc3ef0c7b8df8269523fc3b2cce1e65 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected da49b602f7f75ccc91386e1274b3ef71676cd092 df8c3af6132640da4788e96a02d653e642059803 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected da49b602f7f75ccc91386e1274b3ef71676cd092 56c2b5831d39dc84aad2573dc3e197af1a872a05 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.7","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.7 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.111 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.53 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.7 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"98107","cve":"CVE-2026-98107","epss":"0.001680000","percentile":"0.054050000","score_date":"2026-09-27","updated_at":"2026-09-28 00:02:24"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/bluetooth/l2cap_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"ce0927eb3ee2939fab5ce3f9334bfd2fafb38481","status":"affected","version":"da49b602f7f75ccc91386e1274b3ef71676cd092","versionType":"git"},{"lessThan":"6da5c0331fc3ef0c7b8df8269523fc3b2cce1e65","status":"affected","version":"da49b602f7f75ccc91386e1274b3ef71676cd092","versionType":"git"},{"lessThan":"df8c3af6132640da4788e96a02d653e642059803","status":"affected","version":"da49b602f7f75ccc91386e1274b3ef71676cd092","versionType":"git"},{"lessThan":"56c2b5831d39dc84aad2573dc3e197af1a872a05","status":"affected","version":"da49b602f7f75ccc91386e1274b3ef71676cd092","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/bluetooth/l2cap_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.7"},{"lessThan":"5.7","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.111","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.53","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.7","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.111","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.53","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.7","versionStartIncluding":"5.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc2","versionStartIncluding":"5.7","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: fix out-of-bounds write in l2cap_ecred_connect\n\nl2cap_chan_connect() tries to ensure there are no more than\nL2CAP_ECRED_CONN_SCID_MAX pending ECRED channels, so they fit in the\nsame L2CAP_ECRED_CONN_REQ that l2cap_ecred_connect() constructs.\n\nHowever, the check only counts deferred channels.  If 6 L2CAP sockets\nare connected at the same time in order DDDDND (D=deferred,\nN=non-deferred), the last can bump the total to max+1.  It results to\none __le16 written out of bounds of the scid array, and an invalid\nECRED_CONN_REQ being sent.\n\nFix by leaving room for the non-deferred pending ECRED channels in the\ncounting in l2cap_chan_connect(), so the limit can't be exceeded.\n\nMove counting under same critical section where the channel is added.\nAlthough race conditions involving this appear unreachable, it's easier\nto see.\n\nAlso add WARN_ON_ONCE check in l2cap_ecred_defer_connect() to make this\nless brittle."}],"providerMetadata":{"dateUpdated":"2026-09-25T10:35:56.340Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/ce0927eb3ee2939fab5ce3f9334bfd2fafb38481"},{"url":"https://git.kernel.org/stable/c/6da5c0331fc3ef0c7b8df8269523fc3b2cce1e65"},{"url":"https://git.kernel.org/stable/c/df8c3af6132640da4788e96a02d653e642059803"},{"url":"https://git.kernel.org/stable/c/56c2b5831d39dc84aad2573dc3e197af1a872a05"}],"title":"Bluetooth: L2CAP: fix out-of-bounds write in l2cap_ecred_connect","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98107","datePublished":"2026-09-25T10:35:56.340Z","dateReserved":"2026-09-25T10:25:14.316Z","dateUpdated":"2026-09-25T10:35:56.340Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-25 11:17:41","lastModifiedDate":"2026-09-30 14:10:59","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98107","Ordinal":"1","Title":"Bluetooth: L2CAP: fix out-of-bounds write in l2cap_ecred_connect","CVE":"CVE-2026-98107","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98107","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: fix out-of-bounds write in l2cap_ecred_connect\n\nl2cap_chan_connect() tries to ensure there are no more than\nL2CAP_ECRED_CONN_SCID_MAX pending ECRED channels, so they fit in the\nsame L2CAP_ECRED_CONN_REQ that l2cap_ecred_connect() constructs.\n\nHowever, the check only counts deferred channels.  If 6 L2CAP sockets\nare connected at the same time in order DDDDND (D=deferred,\nN=non-deferred), the last can bump the total to max+1.  It results to\none __le16 written out of bounds of the scid array, and an invalid\nECRED_CONN_REQ being sent.\n\nFix by leaving room for the non-deferred pending ECRED channels in the\ncounting in l2cap_chan_connect(), so the limit can't be exceeded.\n\nMove counting under same critical section where the channel is added.\nAlthough race conditions involving this appear unreachable, it's easier\nto see.\n\nAlso add WARN_ON_ONCE check in l2cap_ecred_defer_connect() to make this\nless brittle.","Type":"Description","Title":"Bluetooth: L2CAP: fix out-of-bounds write in l2cap_ecred_connect"}]}}}