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GHSA-X3W4-Q7CR-J86P

Vulnerability from github – Published: 2025-10-22 18:30 – Updated: 2025-10-22 18:30

Details

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().

Severity

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49555"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-26T07:01:31Z",
    "severity": "MODERATE"
  },
  "details": "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().",
  "id": "GHSA-x3w4-q7cr-j86p",
  "modified": "2025-10-22T18:30:32Z",
  "published": "2025-10-22T18:30:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49555"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2717654ae022e6ea959a4b7b762702fe1a4690c2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/37d17f63d085d601011964ade7371aeebeb6ed4b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4989bb03342941f2b730b37dfa38bce27b543661"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/72ef98445aca568a81c2da050532500a8345ad3a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/db03727b4bbbbb36e6ef4cb655c670eefb6448e9"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2022-49555 (GCVE-0-2022-49555)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:14 – Updated: 2026-08-05 08:55

Title

Bluetooth: hci_qca: Use del_timer_sync() before freeing

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().

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/4989bb03342941f2b…
https://git.kernel.org/stable/c/db03727b4bbbbb36e…
https://git.kernel.org/stable/c/37d17f63d085d6010…
https://git.kernel.org/stable/c/2717654ae022e6ea9…
https://git.kernel.org/stable/c/72ef98445aca568a8…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0ff252c1976da5d80db1377eb39b551931e61826 , < 4989bb03342941f2b730b37dfa38bce27b543661 (git) Affected: 0ff252c1976da5d80db1377eb39b551931e61826 , < db03727b4bbbbb36e6ef4cb655c670eefb6448e9 (git) Affected: 0ff252c1976da5d80db1377eb39b551931e61826 , < 37d17f63d085d601011964ade7371aeebeb6ed4b (git) Affected: 0ff252c1976da5d80db1377eb39b551931e61826 , < 2717654ae022e6ea959a4b7b762702fe1a4690c2 (git) Affected: 0ff252c1976da5d80db1377eb39b551931e61826 , < 72ef98445aca568a81c2da050532500a8345ad3a (git)
Linux	Linux	Affected: 4.3 Unaffected: 0 , < 4.3 (semver) Unaffected: 5.10.120 , ≤ 5.10.* (semver) Unaffected: 5.15.45 , ≤ 5.15.* (semver) Unaffected: 5.17.13 , ≤ 5.17.* (semver) Unaffected: 5.18.2 , ≤ 5.18.* (semver) Unaffected: 5.19 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/bluetooth/hci_qca.c"
          ],
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          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4989bb03342941f2b730b37dfa38bce27b543661",
              "status": "affected",
              "version": "0ff252c1976da5d80db1377eb39b551931e61826",
              "versionType": "git"
            },
            {
              "lessThan": "db03727b4bbbbb36e6ef4cb655c670eefb6448e9",
              "status": "affected",
              "version": "0ff252c1976da5d80db1377eb39b551931e61826",
              "versionType": "git"
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            {
              "lessThan": "37d17f63d085d601011964ade7371aeebeb6ed4b",
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              "lessThan": "2717654ae022e6ea959a4b7b762702fe1a4690c2",
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              "lessThan": "72ef98445aca568a81c2da050532500a8345ad3a",
              "status": "affected",
              "version": "0ff252c1976da5d80db1377eb39b551931e61826",
              "versionType": "git"
            }
          ]
        },
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          "defaultStatus": "affected",
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.3"
            },
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              "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",
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                },
                {
                  "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:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "4.3",
                  "vulnerable": true
                },
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "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"
      }
    }
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  "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"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-X3W4-Q7CR-J86P

CVE-2022-49555 (GCVE-0-2022-49555)

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