{ "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" } } } }