{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-49555","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-02-26T02:08:31.590Z","datePublished":"2025-02-26T02:14:03.150Z","dateUpdated":"2026-08-05T08:55:41.869Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T08:55:41.869Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_qca: Use del_timer_sync() before freeing\n\nWhile looking at a crash report on a timer list being corrupted, which\nusually happens when a timer is freed while still active. This is\ncommonly triggered by code calling del_timer() instead of\ndel_timer_sync() just before freeing.\n\nOne possible culprit is the hci_qca driver, which does exactly that.\n\nEric mentioned that wake_retrans_timer could be rearmed via the work\nqueue, so also move the destruction of the work queue before\ndel_timer_sync()."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The bug is reached on local HCI UART protocol teardown (hci_uart_tty_close/hci_uart_unregister_device → qca_close), not by processing Bluetooth radio frames from a peer, matching other local HCI/UART close scores rather than Adjacent RF bugs.\nAC:L - An attacker who drives IBS TX/wake work to arm or queue re-arm of tx_idle_timer/wake_retrans_timer and then closes the N_HCI/QCA instance controls both sides of the del_timer-versus-workqueue-rearm race, and can retry until the free hits an active timer.\nPR:L - Affected LTS kernels before the 5.16 CAP_NET_ADMIN gate allow unprivileged N_HCI attach (including via PTY), and even where CAP_NET_ADMIN is required it is scored Low under the overestimate rule used for other HCI management bugs.\nUI:N - The attacker opens/configures the HCI UART QCA protocol and closes the descriptor (or unbinds) themselves; no separate victim action is required.\nS:U - Impact is host-kernel heap/timer-list corruption within the same OS security authority, with no VM escape, IOMMU bypass, or other cross-boundary effect.\nC:H - Freeing qca_data while its embedded timers remain active is a use-after-free; a groomed reallocation can be read back when the timer fires, enabling arbitrary kernel disclosure per UAF guidance.\nI:H - The same timer UAF lets the timer core operate on and invoke callbacks from freed/reallocated memory, yielding heap-spray write and control-flow hijack primitives.\nA:H - An active timer freed with the qca object reliably corrupts the timer wheel/slab and can oops/panic even when not fully exploited, which is Availability High."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/bluetooth/hci_qca.c"],"versions":[{"version":"0ff252c1976da5d80db1377eb39b551931e61826","lessThan":"4989bb03342941f2b730b37dfa38bce27b543661","status":"affected","versionType":"git"},{"version":"0ff252c1976da5d80db1377eb39b551931e61826","lessThan":"db03727b4bbbbb36e6ef4cb655c670eefb6448e9","status":"affected","versionType":"git"},{"version":"0ff252c1976da5d80db1377eb39b551931e61826","lessThan":"37d17f63d085d601011964ade7371aeebeb6ed4b","status":"affected","versionType":"git"},{"version":"0ff252c1976da5d80db1377eb39b551931e61826","lessThan":"2717654ae022e6ea959a4b7b762702fe1a4690c2","status":"affected","versionType":"git"},{"version":"0ff252c1976da5d80db1377eb39b551931e61826","lessThan":"72ef98445aca568a81c2da050532500a8345ad3a","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/bluetooth/hci_qca.c"],"versions":[{"version":"4.3","status":"affected"},{"version":"0","lessThan":"4.3","status":"unaffected","versionType":"semver"},{"version":"5.10.120","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.45","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"5.17.13","lessThanOrEqual":"5.17.*","status":"unaffected","versionType":"semver"},{"version":"5.18.2","lessThanOrEqual":"5.18.*","status":"unaffected","versionType":"semver"},{"version":"5.19","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"5.10.120"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"5.15.45"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"5.17.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"5.18.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"5.19"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/4989bb03342941f2b730b37dfa38bce27b543661"},{"url":"https://git.kernel.org/stable/c/db03727b4bbbbb36e6ef4cb655c670eefb6448e9"},{"url":"https://git.kernel.org/stable/c/37d17f63d085d601011964ade7371aeebeb6ed4b"},{"url":"https://git.kernel.org/stable/c/2717654ae022e6ea959a4b7b762702fe1a4690c2"},{"url":"https://git.kernel.org/stable/c/72ef98445aca568a81c2da050532500a8345ad3a"}],"title":"Bluetooth: hci_qca: Use del_timer_sync() before freeing","x_generator":{"engine":"bippy-1.2.0"}}}}