CVE-2026-64409 (GCVE-0-2026-64409)
Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-07-25 08:50
VLAI
EPSS
VEX
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
References
6 references
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) |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/bluetooth/btmtksdio.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "f6682c23b6fac4780d297ae4662053d17e58fd52",
"status": "affected",
"version": "26270bc189ea4b5a8356ec99561357fc87f00b32",
"versionType": "git"
},
{
"lessThan": "466540e045d01fcacf383a5beb8a2dad2fc53a26",
"status": "affected",
"version": "26270bc189ea4b5a8356ec99561357fc87f00b32",
"versionType": "git"
},
{
"lessThan": "7b429d611060e87752e848851815537963726493",
"status": "affected",
"version": "26270bc189ea4b5a8356ec99561357fc87f00b32",
"versionType": "git"
},
{
"lessThan": "0039bdde36b23ccf1196635f1d52c5490481544d",
"status": "affected",
"version": "26270bc189ea4b5a8356ec99561357fc87f00b32",
"versionType": "git"
},
{
"lessThan": "0f0a83e26a9c7fd4b243c315ce07161d2496d83d",
"status": "affected",
"version": "26270bc189ea4b5a8356ec99561357fc87f00b32",
"versionType": "git"
},
{
"lessThan": "a257407e2bbbb099ed427719a50563f67fa366d8",
"status": "affected",
"version": "26270bc189ea4b5a8356ec99561357fc87f00b32",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/bluetooth/btmtksdio.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.17"
},
{
"lessThan": "5.17",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.96",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.39",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2-rc1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.178",
"versionStartIncluding": "5.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.145",
"versionStartIncluding": "5.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.96",
"versionStartIncluding": "5.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.39",
"versionStartIncluding": "5.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.4",
"versionStartIncluding": "5.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2-rc1",
"versionStartIncluding": "5.17",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"providerMetadata": {
"dateUpdated": "2026-07-25T08:50:50.604Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/f6682c23b6fac4780d297ae4662053d17e58fd52"
},
{
"url": "https://git.kernel.org/stable/c/466540e045d01fcacf383a5beb8a2dad2fc53a26"
},
{
"url": "https://git.kernel.org/stable/c/7b429d611060e87752e848851815537963726493"
},
{
"url": "https://git.kernel.org/stable/c/0039bdde36b23ccf1196635f1d52c5490481544d"
},
{
"url": "https://git.kernel.org/stable/c/0f0a83e26a9c7fd4b243c315ce07161d2496d83d"
},
{
"url": "https://git.kernel.org/stable/c/a257407e2bbbb099ed427719a50563f67fa366d8"
}
],
"title": "Bluetooth: btmtksdio: fix infinite loop in btmtksdio_txrx_work()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-64409",
"datePublished": "2026-07-25T08:50:50.604Z",
"dateReserved": "2026-07-19T15:36:31.786Z",
"dateUpdated": "2026-07-25T08:50:50.604Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-64409",
"date": "2026-07-26",
"epss": "0.00173",
"percentile": "0.06925"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-64409\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-25T10:17:24.633\",\"lastModified\":\"2026-07-25T10:17:24.633\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/bluetooth/btmtksdio.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"26270bc189ea4b5a8356ec99561357fc87f00b32\",\"lessThan\":\"f6682c23b6fac4780d297ae4662053d17e58fd52\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"26270bc189ea4b5a8356ec99561357fc87f00b32\",\"lessThan\":\"466540e045d01fcacf383a5beb8a2dad2fc53a26\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"26270bc189ea4b5a8356ec99561357fc87f00b32\",\"lessThan\":\"7b429d611060e87752e848851815537963726493\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"26270bc189ea4b5a8356ec99561357fc87f00b32\",\"lessThan\":\"0039bdde36b23ccf1196635f1d52c5490481544d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"26270bc189ea4b5a8356ec99561357fc87f00b32\",\"lessThan\":\"0f0a83e26a9c7fd4b243c315ce07161d2496d83d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"26270bc189ea4b5a8356ec99561357fc87f00b32\",\"lessThan\":\"a257407e2bbbb099ed427719a50563f67fa366d8\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/bluetooth/btmtksdio.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.17\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.17\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0039bdde36b23ccf1196635f1d52c5490481544d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0f0a83e26a9c7fd4b243c315ce07161d2496d83d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/466540e045d01fcacf383a5beb8a2dad2fc53a26\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7b429d611060e87752e848851815537963726493\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a257407e2bbbb099ed427719a50563f67fa366d8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f6682c23b6fac4780d297ae4662053d17e58fd52\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
"suse_vex": {
"aggregate_severity": "not set",
"current_release_date": "2026-07-25T15:59:53Z",
"cve": "CVE-2026-64409",
"id": "CVE-2026-64409",
"initial_release_date": "2026-07-25T15:59:53Z",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-64409",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64409.json",
"version": "2"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
Loading…
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.
Loading…
Loading…