CVE-2022-49555 (GCVE-0-2022-49555)
Vulnerability from cvelistv5
Published
2025-02-26 02:14
Modified
2026-08-05 08:55
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_qca: Use del_timer_sync() before freeing While looking at a crash report on a timer list being corrupted, which usually happens when a timer is freed while still active. This is commonly triggered by code calling del_timer() instead of del_timer_sync() just before freeing. One possible culprit is the hci_qca driver, which does exactly that. Eric mentioned that wake_retrans_timer could be rearmed via the work queue, so also move the destruction of the work queue before del_timer_sync().
References
Impacted products
Vendor Product Version
Linux Linux Version: 0ff252c1976da5d80db1377eb39b551931e61826
Version: 0ff252c1976da5d80db1377eb39b551931e61826
Version: 0ff252c1976da5d80db1377eb39b551931e61826
Version: 0ff252c1976da5d80db1377eb39b551931e61826
Version: 0ff252c1976da5d80db1377eb39b551931e61826
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/bluetooth/hci_qca.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/bluetooth/hci_qca.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.3"
            },
            {
              "lessThan": "4.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.120",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.17.*",
              "status": "unaffected",
              "version": "5.17.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.18.*",
              "status": "unaffected",
              "version": "5.18.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.120",
                  "versionStartIncluding": "4.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.45",
                  "versionStartIncluding": "4.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.17.13",
                  "versionStartIncluding": "4.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.18.2",
                  "versionStartIncluding": "4.3",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19",
                  "versionStartIncluding": "4.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached on local HCI UART protocol teardown (hci_uart_tty_close/hci_uart_unregister_device \u2192 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:55:41.869Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49555",
    "datePublished": "2025-02-26T02:14:03.150Z",
    "dateReserved": "2025-02-26T02:08:31.590Z",
    "dateUpdated": "2026-08-05T08:55:41.869Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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