{"id":"CVE-2026-63948","state":"PUBLISHED","title":"Bluetooth: L2CAP: fix chan ref leak in l2cap_chan_timeout() on !conn","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: fix chan ref leak in l2cap_chan_timeout() on !conn\n\n__set_chan_timer() takes a l2cap_chan reference via l2cap_chan_hold()\nbefore scheduling the delayed work.  The normal path in\nl2cap_chan_timeout() drops this reference with l2cap_chan_put() at the\nend, but the early return when chan->conn is NULL skips the put,\nleaking the reference.\n\nAdd the missing l2cap_chan_put() before the early return.","publishedAt":"2026-07-19T14:55:41.985Z","updatedAt":"2026-07-19T14:55:41.985Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"06acb75e7ed600d0bbf7bff5628aa8f24a97978c","status":"affected","lessThan":"50f1bcaaaa3a80bb1c3472044bc146e8d49d51ee","versionType":"git"},{"version":"e97e16433eb4533083b096a3824b93a5ca3aee79","status":"affected","lessThan":"b5c59a5b469e2a809a2d57eda4ded94235971060","versionType":"git"},{"version":"8960ff650aec70485b40771cd8e6e8c4cb467d33","status":"affected","lessThan":"8894c2010435a56ce7c6c2a8785860c13554df2f","versionType":"git"},{"version":"955b5b6c54d95b5e7444dfc81c95c8e013f27ac0","status":"affected","lessThan":"63cd225cc13d782a85e2a73c04d0d350153eada1","versionType":"git"},{"version":"adf0398cee86643b8eacde95f17d073d022f782c","status":"affected","lessThan":"107c826e4ef9ec5ad8f60e6fe64d8d5325ba508f","versionType":"git"},{"version":"adf0398cee86643b8eacde95f17d073d022f782c","status":"affected","lessThan":"e8a5baff5be273ca07771fd2b9bb1f2a4152917b","versionType":"git"},{"version":"adf0398cee86643b8eacde95f17d073d022f782c","status":"affected","lessThan":"08d81fe96f80a8e20c7acb573b6a45d901fcf2cd","versionType":"git"},{"version":"adf0398cee86643b8eacde95f17d073d022f782c","status":"affected","lessThan":"9dbd84990394c51f5cee1e8871bb5ff8af5ed939","versionType":"git"},{"version":"e137e2ba96e51902dc2878131823a96bf8e638ae","status":"affected","versionType":"git"},{"version":"6466ee65e5b27161c846c73ef407f49dfa1bd1d9","status":"affected","versionType":"git"},{"version":"eb86f955488c39526534211f2610e48a5cf8ead4","status":"affected","versionType":"git"},{"version":"5.10.217","status":"affected","lessThan":"5.10.259","versionType":"semver"},{"version":"5.15.159","status":"affected","lessThan":"5.15.210","versionType":"semver"},{"version":"6.1.91","status":"affected","lessThan":"6.1.176","versionType":"semver"},{"version":"6.6.31","status":"affected","lessThan":"6.6.143","versionType":"semver"},{"version":"4.19.314","status":"affected","lessThan":"4.20","versionType":"semver"},{"version":"5.4.276","status":"affected","lessThan":"5.5","versionType":"semver"},{"version":"6.8.10","status":"affected","lessThan":"6.9","versionType":"semver"}],"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":"6.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.9","versionType":"semver"},{"version":"5.10.259","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.210","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.176","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.93","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.35","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.12","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","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/50f1bcaaaa3a80bb1c3472044bc146e8d49d51ee","https://git.kernel.org/stable/c/b5c59a5b469e2a809a2d57eda4ded94235971060","https://git.kernel.org/stable/c/8894c2010435a56ce7c6c2a8785860c13554df2f","https://git.kernel.org/stable/c/63cd225cc13d782a85e2a73c04d0d350153eada1","https://git.kernel.org/stable/c/107c826e4ef9ec5ad8f60e6fe64d8d5325ba508f","https://git.kernel.org/stable/c/e8a5baff5be273ca07771fd2b9bb1f2a4152917b","https://git.kernel.org/stable/c/08d81fe96f80a8e20c7acb573b6a45d901fcf2cd","https://git.kernel.org/stable/c/9dbd84990394c51f5cee1e8871bb5ff8af5ed939"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/63xxx/CVE-2026-63948.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-63948","state":"PUBLISHED","datePublished":"2026-07-19T14:55:41.985Z","dateUpdated":"2026-07-19T14:55:41.985Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T07:54:57.023Z"},"containers":{"cna":{"title":"Bluetooth: L2CAP: fix chan ref leak in l2cap_chan_timeout() on !conn","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: fix chan ref leak in l2cap_chan_timeout() on !conn\n\n__set_chan_timer() takes a l2cap_chan reference via l2cap_chan_hold()\nbefore scheduling the delayed work.  The normal path in\nl2cap_chan_timeout() drops this reference with l2cap_chan_put() at the\nend, but the early return when chan->conn is NULL skips the put,\nleaking the reference.\n\nAdd the missing l2cap_chan_put() before the early return."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"06acb75e7ed600d0bbf7bff5628aa8f24a97978c","status":"affected","lessThan":"50f1bcaaaa3a80bb1c3472044bc146e8d49d51ee","versionType":"git"},{"version":"e97e16433eb4533083b096a3824b93a5ca3aee79","status":"affected","lessThan":"b5c59a5b469e2a809a2d57eda4ded94235971060","versionType":"git"},{"version":"8960ff650aec70485b40771cd8e6e8c4cb467d33","status":"affected","lessThan":"8894c2010435a56ce7c6c2a8785860c13554df2f","versionType":"git"},{"version":"955b5b6c54d95b5e7444dfc81c95c8e013f27ac0","status":"affected","lessThan":"63cd225cc13d782a85e2a73c04d0d350153eada1","versionType":"git"},{"version":"adf0398cee86643b8eacde95f17d073d022f782c","status":"affected","lessThan":"107c826e4ef9ec5ad8f60e6fe64d8d5325ba508f","versionType":"git"},{"version":"adf0398cee86643b8eacde95f17d073d022f782c","status":"affected","lessThan":"e8a5baff5be273ca07771fd2b9bb1f2a4152917b","versionType":"git"},{"version":"adf0398cee86643b8eacde95f17d073d022f782c","status":"affected","lessThan":"08d81fe96f80a8e20c7acb573b6a45d901fcf2cd","versionType":"git"},{"version":"adf0398cee86643b8eacde95f17d073d022f782c","status":"affected","lessThan":"9dbd84990394c51f5cee1e8871bb5ff8af5ed939","versionType":"git"},{"version":"e137e2ba96e51902dc2878131823a96bf8e638ae","status":"affected","versionType":"git"},{"version":"6466ee65e5b27161c846c73ef407f49dfa1bd1d9","status":"affected","versionType":"git"},{"version":"eb86f955488c39526534211f2610e48a5cf8ead4","status":"affected","versionType":"git"},{"version":"5.10.217","status":"affected","lessThan":"5.10.259","versionType":"semver"},{"version":"5.15.159","status":"affected","lessThan":"5.15.210","versionType":"semver"},{"version":"6.1.91","status":"affected","lessThan":"6.1.176","versionType":"semver"},{"version":"6.6.31","status":"affected","lessThan":"6.6.143","versionType":"semver"},{"version":"4.19.314","status":"affected","lessThan":"4.20","versionType":"semver"},{"version":"5.4.276","status":"affected","lessThan":"5.5","versionType":"semver"},{"version":"6.8.10","status":"affected","lessThan":"6.9","versionType":"semver"}],"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":"6.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.9","versionType":"semver"},{"version":"5.10.259","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.210","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.176","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.93","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.35","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.12","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","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/50f1bcaaaa3a80bb1c3472044bc146e8d49d51ee"},{"url":"https://git.kernel.org/stable/c/b5c59a5b469e2a809a2d57eda4ded94235971060"},{"url":"https://git.kernel.org/stable/c/8894c2010435a56ce7c6c2a8785860c13554df2f"},{"url":"https://git.kernel.org/stable/c/63cd225cc13d782a85e2a73c04d0d350153eada1"},{"url":"https://git.kernel.org/stable/c/107c826e4ef9ec5ad8f60e6fe64d8d5325ba508f"},{"url":"https://git.kernel.org/stable/c/e8a5baff5be273ca07771fd2b9bb1f2a4152917b"},{"url":"https://git.kernel.org/stable/c/08d81fe96f80a8e20c7acb573b6a45d901fcf2cd"},{"url":"https://git.kernel.org/stable/c/9dbd84990394c51f5cee1e8871bb5ff8af5ed939"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-07-19T14:55:41.985Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.217","versionEndExcluding":"5.10.259"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.159","versionEndExcluding":"5.15.210"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.91","versionEndExcluding":"6.1.176"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.31","versionEndExcluding":"6.6.143"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.12.93"},{"vulnerable":true,"criteria":"cpe:2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