Bluetooth: L2CAP: Fix deadlock in l2cap_conn_del()
Summary
| CVE | CVE-2026-31499 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-04-22 14:16:48 UTC |
| Updated | 2026-05-14 15:16:45 UTC |
| Description | In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix deadlock in l2cap_conn_del() l2cap_conn_del() calls cancel_delayed_work_sync() for both info_timer and id_addr_timer while holding conn->lock. However, the work functions l2cap_info_timeout() and l2cap_conn_update_id_addr() both acquire conn->lock, creating a potential AB-BA deadlock if the work is already executing when l2cap_conn_del() takes the lock. Move the work cancellations before acquiring conn->lock and use disable_delayed_work_sync() to additionally prevent the works from being rearmed after cancellation, consistent with the pattern used in hci_conn_del(). |
Risk And Classification
Primary CVSS: v3.1 5.5 MEDIUM from [email protected]
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.000170000 probability, percentile 0.040700000 (date 2026-04-26)
Problem Types: CWE-667
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
NoneAvailability
HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Linux | Linux Kernel | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected f87271d21dd4ee83857ca11b94e7b4952749bbae f7f35a4f7fd574f5889bb2e4b397e14cbb83f6da git | Not specified |
| CNA | Linux | Linux | affected ab4eedb790cae44313759b50fe47da285e2519d5 3f26ecbd9cde621dd94be7ef252c7210b965a5c7 git | Not specified |
| CNA | Linux | Linux | affected ab4eedb790cae44313759b50fe47da285e2519d5 d008460de352e534f6721de829b093368564ec66 git | Not specified |
| CNA | Linux | Linux | affected ab4eedb790cae44313759b50fe47da285e2519d5 00fdebbbc557a2fc21321ff2eaa22fd70c078608 git | Not specified |
| CNA | Linux | Linux | affected efc30877bd4bc85fefe98d80af60fafc86e5775e git | Not specified |
| CNA | Linux | Linux | affected 18ab6b6078fa8191ca30a3065d57bf35d5635761 git | Not specified |
| CNA | Linux | Linux | affected 6.14 | Not specified |
| CNA | Linux | Linux | unaffected 6.14 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.88 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.21 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.19.11 6.19.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/00fdebbbc557a2fc21321ff2eaa22fd70c078608 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/3f26ecbd9cde621dd94be7ef252c7210b965a5c7 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/d008460de352e534f6721de829b093368564ec66 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/f7f35a4f7fd574f5889bb2e4b397e14cbb83f6da | 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.