Bluetooth: btusb: Fix UAF of btusb_data by rx_work
Summary
| CVE | CVE-2026-97977 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-25 11:17:25 UTC |
| Updated | 2026-10-03 11:18:21 UTC |
| Description | In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btusb: Fix UAF of btusb_data by rx_work btusb_close() and btusb_flush() cancel data->rx_work with the asynchronous cancel_delayed_work(), so if btusb_rx_work() is already running on another CPU it keeps running after the cancel returns. btusb_disconnect() calls hci_unregister_dev(), which invokes btusb_close(), and then frees the btusb_data. A still running btusb_rx_work() then dereferences the freed data: while ((skb = skb_dequeue(&data->acl_q))) data->recv_acl(data->hdev, skb); Use cancel_delayed_work_sync() instead. In btusb_close() the cancel also has to happen after btusb_stop_traffic(), otherwise an URB completion racing with the cancel can requeue the work right after it has been waited for. |
Risk And Classification
EPSS: 0.001680000 probability, percentile 0.054030000 (date 2026-09-27)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 800fe5ec302e1ebbf5e3f891f886deecd49c7132 fc654a72a8d979db15e2773a481e931abaf5a9e8 git | Not specified |
| CNA | Linux | Linux | affected 800fe5ec302e1ebbf5e3f891f886deecd49c7132 5242050195a711e9cd6a9935f689ab6656b94a91 git | Not specified |
| CNA | Linux | Linux | affected 800fe5ec302e1ebbf5e3f891f886deecd49c7132 472d005622525b7be155cac99dde2252b0163bd1 git | Not specified |
| CNA | Linux | Linux | affected 800fe5ec302e1ebbf5e3f891f886deecd49c7132 93b59937bda3fffc6386c79f5544a39bc680c8e8 git | Not specified |
| CNA | Linux | Linux | affected 800fe5ec302e1ebbf5e3f891f886deecd49c7132 fa391adb9c755515a89993634745e9079e5ef37c git | Not specified |
| CNA | Linux | Linux | affected 800fe5ec302e1ebbf5e3f891f886deecd49c7132 1c12c3117639e78940959d956519c758c57d0849 git | Not specified |
| CNA | Linux | Linux | affected 5.17 | Not specified |
| CNA | Linux | Linux | unaffected 5.17 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.189 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.158 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.111 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.53 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2.7 7.2.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.3-rc3 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/fc654a72a8d979db15e2773a481e931abaf5a9e8 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/1c12c3117639e78940959d956519c758c57d0849 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/fa391adb9c755515a89993634745e9079e5ef37c | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/93b59937bda3fffc6386c79f5544a39bc680c8e8 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/5242050195a711e9cd6a9935f689ab6656b94a91 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/472d005622525b7be155cac99dde2252b0163bd1 | 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.