{"id":"CVE-2026-97977","state":"PUBLISHED","title":"Bluetooth: btusb: Fix UAF of btusb_data by rx_work","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btusb: Fix UAF of btusb_data by rx_work\n\nbtusb_close() and btusb_flush() cancel data->rx_work with the\nasynchronous cancel_delayed_work(), so if btusb_rx_work() is already\nrunning on another CPU it keeps running after the cancel returns.\n\nbtusb_disconnect() calls hci_unregister_dev(), which invokes\nbtusb_close(), and then frees the btusb_data. A still running\nbtusb_rx_work() then dereferences the freed data:\n\n\twhile ((skb = skb_dequeue(&data->acl_q)))\n\t\tdata->recv_acl(data->hdev, skb);\n\nUse cancel_delayed_work_sync() instead. In btusb_close() the cancel also\nhas to happen after btusb_stop_traffic(), otherwise an URB completion\nracing with the cancel can requeue the work right after it has been\nwaited for.","publishedAt":"2026-09-25T10:23:15.198Z","updatedAt":"2026-10-19T09:11:44.507Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"800fe5ec302e1ebbf5e3f891f886deecd49c7132","status":"affected","lessThan":"fc654a72a8d979db15e2773a481e931abaf5a9e8","versionType":"git"},{"version":"800fe5ec302e1ebbf5e3f891f886deecd49c7132","status":"affected","lessThan":"5242050195a711e9cd6a9935f689ab6656b94a91","versionType":"git"},{"version":"800fe5ec302e1ebbf5e3f891f886deecd49c7132","status":"affected","lessThan":"472d005622525b7be155cac99dde2252b0163bd1","versionType":"git"},{"version":"800fe5ec302e1ebbf5e3f891f886deecd49c7132","status":"affected","lessThan":"93b59937bda3fffc6386c79f5544a39bc680c8e8","versionType":"git"},{"version":"800fe5ec302e1ebbf5e3f891f886deecd49c7132","status":"affected","lessThan":"fa391adb9c755515a89993634745e9079e5ef37c","versionType":"git"},{"version":"800fe5ec302e1ebbf5e3f891f886deecd49c7132","status":"affected","lessThan":"1c12c3117639e78940959d956519c758c57d0849","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/bluetooth/btusb.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.17","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/bluetooth/btusb.c"]}],"references":["https://git.kernel.org/stable/c/fc654a72a8d979db15e2773a481e931abaf5a9e8","https://git.kernel.org/stable/c/5242050195a711e9cd6a9935f689ab6656b94a91","https://git.kernel.org/stable/c/472d005622525b7be155cac99dde2252b0163bd1","https://git.kernel.org/stable/c/93b59937bda3fffc6386c79f5544a39bc680c8e8","https://git.kernel.org/stable/c/fa391adb9c755515a89993634745e9079e5ef37c","https://git.kernel.org/stable/c/1c12c3117639e78940959d956519c758c57d0849"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/97xxx/CVE-2026-97977.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-97977","state":"PUBLISHED","datePublished":"2026-09-25T10:23:15.198Z","dateUpdated":"2026-10-19T09:11:44.507Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:18:58.208Z"},"containers":{"cna":{"title":"Bluetooth: btusb: Fix UAF of btusb_data by rx_work","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btusb: Fix UAF of btusb_data by rx_work\n\nbtusb_close() and btusb_flush() cancel data->rx_work with the\nasynchronous cancel_delayed_work(), so if btusb_rx_work() is already\nrunning on another CPU it keeps running after the cancel returns.\n\nbtusb_disconnect() calls hci_unregister_dev(), which invokes\nbtusb_close(), and then frees the btusb_data. A still running\nbtusb_rx_work() then dereferences the freed data:\n\n\twhile ((skb = skb_dequeue(&data->acl_q)))\n\t\tdata->recv_acl(data->hdev, skb);\n\nUse cancel_delayed_work_sync() instead. In btusb_close() the cancel also\nhas to happen after btusb_stop_traffic(), otherwise an URB completion\nracing with the cancel can requeue the work right after it has been\nwaited for."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"800fe5ec302e1ebbf5e3f891f886deecd49c7132","status":"affected","lessThan":"fc654a72a8d979db15e2773a481e931abaf5a9e8","versionType":"git"},{"version":"800fe5ec302e1ebbf5e3f891f886deecd49c7132","status":"affected","lessThan":"5242050195a711e9cd6a9935f689ab6656b94a91","versionType":"git"},{"version":"800fe5ec302e1ebbf5e3f891f886deecd49c7132","status":"affected","lessThan":"472d005622525b7be155cac99dde2252b0163bd1","versionType":"git"},{"version":"800fe5ec302e1ebbf5e3f891f886deecd49c7132","status":"affected","lessThan":"93b59937bda3fffc6386c79f5544a39bc680c8e8","versionType":"git"},{"version":"800fe5ec302e1ebbf5e3f891f886deecd49c7132","status":"affected","lessThan":"fa391adb9c755515a89993634745e9079e5ef37c","versionType":"git"},{"version":"800fe5ec302e1ebbf5e3f891f886deecd49c7132","status":"affected","lessThan":"1c12c3117639e78940959d956519c758c57d0849","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/bluetooth/btusb.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.17","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/bluetooth/btusb.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/fc654a72a8d979db15e2773a481e931abaf5a9e8"},{"url":"https://git.kernel.org/stable/c/5242050195a711e9cd6a9935f689ab6656b94a91"},{"url":"https://git.kernel.org/stable/c/472d005622525b7be155cac99dde2252b0163bd1"},{"url":"https://git.kernel.org/stable/c/93b59937bda3fffc6386c79f5544a39bc680c8e8"},{"url":"https://git.kernel.org/stable/c/fa391adb9c755515a89993634745e9079e5ef37c"},{"url":"https://git.kernel.org/stable/c/1c12c3117639e78940959d956519c758c57d0849"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:11:44.507Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17","versionEndExcluding":"7.2.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}