Bluetooth: L2CAP: fix chan ref leak in l2cap_chan_timeout() on !conn
Summary
| CVE | CVE-2026-63948 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-07-19 16:17:13 UTC |
| Updated | 2026-07-19 16:17:13 UTC |
| Description | In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: fix chan ref leak in l2cap_chan_timeout() on !conn __set_chan_timer() takes a l2cap_chan reference via l2cap_chan_hold() before scheduling the delayed work. The normal path in l2cap_chan_timeout() drops this reference with l2cap_chan_put() at the end, but the early return when chan->conn is NULL skips the put, leaking the reference. Add the missing l2cap_chan_put() before the early return. |
Risk And Classification
EPSS: 0.002100000 probability, percentile 0.113590000 (date 2026-07-20)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 06acb75e7ed600d0bbf7bff5628aa8f24a97978c 50f1bcaaaa3a80bb1c3472044bc146e8d49d51ee git | Not specified |
| CNA | Linux | Linux | affected e97e16433eb4533083b096a3824b93a5ca3aee79 b5c59a5b469e2a809a2d57eda4ded94235971060 git | Not specified |
| CNA | Linux | Linux | affected 8960ff650aec70485b40771cd8e6e8c4cb467d33 8894c2010435a56ce7c6c2a8785860c13554df2f git | Not specified |
| CNA | Linux | Linux | affected 955b5b6c54d95b5e7444dfc81c95c8e013f27ac0 63cd225cc13d782a85e2a73c04d0d350153eada1 git | Not specified |
| CNA | Linux | Linux | affected adf0398cee86643b8eacde95f17d073d022f782c 107c826e4ef9ec5ad8f60e6fe64d8d5325ba508f git | Not specified |
| CNA | Linux | Linux | affected adf0398cee86643b8eacde95f17d073d022f782c e8a5baff5be273ca07771fd2b9bb1f2a4152917b git | Not specified |
| CNA | Linux | Linux | affected adf0398cee86643b8eacde95f17d073d022f782c 08d81fe96f80a8e20c7acb573b6a45d901fcf2cd git | Not specified |
| CNA | Linux | Linux | affected adf0398cee86643b8eacde95f17d073d022f782c 9dbd84990394c51f5cee1e8871bb5ff8af5ed939 git | Not specified |
| CNA | Linux | Linux | affected e137e2ba96e51902dc2878131823a96bf8e638ae git | Not specified |
| CNA | Linux | Linux | affected 6466ee65e5b27161c846c73ef407f49dfa1bd1d9 git | Not specified |
| CNA | Linux | Linux | affected eb86f955488c39526534211f2610e48a5cf8ead4 git | Not specified |
| CNA | Linux | Linux | affected 5.10.217 5.10.259 semver | Not specified |
| CNA | Linux | Linux | affected 5.15.159 5.15.210 semver | Not specified |
| CNA | Linux | Linux | affected 6.1.91 6.1.176 semver | Not specified |
| CNA | Linux | Linux | affected 6.6.31 6.6.143 semver | Not specified |
| CNA | Linux | Linux | affected 4.19.314 4.20 semver | Not specified |
| CNA | Linux | Linux | affected 5.4.276 5.5 semver | Not specified |
| CNA | Linux | Linux | affected 6.8.10 6.9 semver | Not specified |
| CNA | Linux | Linux | affected 6.9 | Not specified |
| CNA | Linux | Linux | unaffected 6.9 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.259 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.210 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.176 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.143 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.93 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.35 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0.12 7.0.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/b5c59a5b469e2a809a2d57eda4ded94235971060 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/e8a5baff5be273ca07771fd2b9bb1f2a4152917b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/8894c2010435a56ce7c6c2a8785860c13554df2f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/63cd225cc13d782a85e2a73c04d0d350153eada1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/9dbd84990394c51f5cee1e8871bb5ff8af5ed939 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/08d81fe96f80a8e20c7acb573b6a45d901fcf2cd | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/107c826e4ef9ec5ad8f60e6fe64d8d5325ba508f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/50f1bcaaaa3a80bb1c3472044bc146e8d49d51ee | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.