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GHSA-X8QW-HC9F-QXQ2

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: btmtksdio: fix infinite loop in btmtksdio_txrx_work()

Every once in a while we see a hung btmtksdio_flush() task:

INFO: task kworker/u17:0:189 blocked for more than 122 seconds. __cancel_work_timer+0x3f4/0x460 cancel_work_sync+0x1c/0x2c btmtksdio_flush+0x2c/0x40 hci_dev_open_sync+0x10c4/0x2190 [..]

It all boils down to incorrect time_is_before_jiffies() usage in btmtksdio_txrx_work(). The btmtksdio_txrx_work() loop is expected to be terminated if running for longer than 5HZ. However the timeout check is twisted: time_is_before_jiffies(old_jiffies + 5HZ) evaluates to true when old_jiffies + 5*HZ is in the past i.e. when a timeout has occurred. Using OR with time_is_before_jiffies(txrx_timeout) means that: - before the 5-second timeout: the condition is int_status || false, so it loops as long as there are pending interrupts. - after the 5-second timeout: the condition becomes int_status || true, which is always true.

When the loop becomes infinite btmtksdio_txrx_work() loop never terminates and never releases the SDIO host.

Fix loop termination condition to actually enforce a 5*HZ timeout.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64409"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:24Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btmtksdio: fix infinite loop in btmtksdio_txrx_work()\n\nEvery once in a while we see a hung btmtksdio_flush() task:\n\n INFO: task kworker/u17:0:189 blocked for more than 122 seconds.\n __cancel_work_timer+0x3f4/0x460\n cancel_work_sync+0x1c/0x2c\n btmtksdio_flush+0x2c/0x40\n hci_dev_open_sync+0x10c4/0x2190\n [..]\n\nIt all boils down to incorrect time_is_before_jiffies() usage in\nbtmtksdio_txrx_work().  The btmtksdio_txrx_work() loop is expected\nto be terminated if running for longer than 5*HZ.  However the\ntimeout check is twisted:  time_is_before_jiffies(old_jiffies + 5*HZ)\nevaluates to true when old_jiffies + 5*HZ is in the past i.e. when a\ntimeout has occurred.  Using OR with time_is_before_jiffies(txrx_timeout)\nmeans that:\n- before the 5-second timeout: the condition is `int_status || false`,\n  so it loops as long as there are pending interrupts.\n- after the 5-second timeout: the condition becomes `int_status || true`,\n  which is always true.\n\nWhen the loop becomes infinite btmtksdio_txrx_work() loop never\nterminates and never releases the SDIO host.\n\nFix loop termination condition to actually enforce a 5*HZ timeout.",
  "id": "GHSA-x8qw-hc9f-qxq2",
  "modified": "2026-07-25T12:31:35Z",
  "published": "2026-07-25T12:31:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64409"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0039bdde36b23ccf1196635f1d52c5490481544d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f0a83e26a9c7fd4b243c315ce07161d2496d83d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/466540e045d01fcacf383a5beb8a2dad2fc53a26"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7b429d611060e87752e848851815537963726493"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a257407e2bbbb099ed427719a50563f67fa366d8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f6682c23b6fac4780d297ae4662053d17e58fd52"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-64409 (GCVE-0-2026-64409)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-07-25 08:50

Title

Bluetooth: btmtksdio: fix infinite loop in btmtksdio_txrx_work()

Summary

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btmtksdio: fix infinite loop in btmtksdio_txrx_work() Every once in a while we see a hung btmtksdio_flush() task: INFO: task kworker/u17:0:189 blocked for more than 122 seconds. __cancel_work_timer+0x3f4/0x460 cancel_work_sync+0x1c/0x2c btmtksdio_flush+0x2c/0x40 hci_dev_open_sync+0x10c4/0x2190 [..] It all boils down to incorrect time_is_before_jiffies() usage in btmtksdio_txrx_work(). The btmtksdio_txrx_work() loop is expected to be terminated if running for longer than 5*HZ. However the timeout check is twisted: time_is_before_jiffies(old_jiffies + 5*HZ) evaluates to true when old_jiffies + 5*HZ is in the past i.e. when a timeout has occurred. Using OR with time_is_before_jiffies(txrx_timeout) means that: - before the 5-second timeout: the condition is `int_status || false`, so it loops as long as there are pending interrupts. - after the 5-second timeout: the condition becomes `int_status || true`, which is always true. When the loop becomes infinite btmtksdio_txrx_work() loop never terminates and never releases the SDIO host. Fix loop termination condition to actually enforce a 5*HZ timeout.

Severity

No CVSS data available.

Assigner

Linux

References

6 references

URL	Tags
https://git.kernel.org/stable/c/f6682c23b6fac4780…
https://git.kernel.org/stable/c/466540e045d01fcac…
https://git.kernel.org/stable/c/7b429d611060e8775…
https://git.kernel.org/stable/c/0039bdde36b23ccf1…
https://git.kernel.org/stable/c/0f0a83e26a9c7fd4b…
https://git.kernel.org/stable/c/a257407e2bbbb099e…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 26270bc189ea4b5a8356ec99561357fc87f00b32 , < f6682c23b6fac4780d297ae4662053d17e58fd52 (git) Affected: 26270bc189ea4b5a8356ec99561357fc87f00b32 , < 466540e045d01fcacf383a5beb8a2dad2fc53a26 (git) Affected: 26270bc189ea4b5a8356ec99561357fc87f00b32 , < 7b429d611060e87752e848851815537963726493 (git) Affected: 26270bc189ea4b5a8356ec99561357fc87f00b32 , < 0039bdde36b23ccf1196635f1d52c5490481544d (git) Affected: 26270bc189ea4b5a8356ec99561357fc87f00b32 , < 0f0a83e26a9c7fd4b243c315ce07161d2496d83d (git) Affected: 26270bc189ea4b5a8356ec99561357fc87f00b32 , < a257407e2bbbb099ed427719a50563f67fa366d8 (git)
Linux	Linux	Affected: 5.17 Unaffected: 0 , < 5.17 (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

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              "versionType": "semver"
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    "dateReserved": "2026-07-19T15:36:31.786Z",
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}

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.

Detection rules are retrieved from Rulezet.

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.

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GHSA-X8QW-HC9F-QXQ2

CVE-2026-64409 (GCVE-0-2026-64409)

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Nomenclature