CVE-2026-64409Bluetooth: btmtksdio: fix infinite loop in btmtksdio_txrx_work()
Updated under an hour ago ()
Does this affect you?
It affects Linux and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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.
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Aug 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 26270bc189ea4b5a8356ec99561357fc87f00b32 before f6682c23b6fac4780d297ae4662053d17e58fd52; from 26270bc189ea4b5a8356ec99561357fc87f00b32 before 466540e045d01fcacf383a5beb8a2dad2fc53a26; 26270bc189ea4b5a8356ec99561357fc87f00b32 builds before 7b429d611060e87752e848851815537963726493; 26270bc189ea4b5a8356ec99561357fc87f00b32 builds before 0039bdde36b23ccf1196635f1d52c5490481544d; 26270bc189ea4b5a8356ec99561357fc87f00b32 builds before 0f0a83e26a9c7fd4b243c315ce07161d2496d83d; from 26270bc189ea4b5a8356ec99561357fc87f00b32 before a257407e2bbbb099ed427719a50563f67fa366d8 | CNA record |
linux linux_kernel linux:linux_kernel | from 5.17 before 6.1.178; from 6.2 before 6.6.145; from 6.7 before 6.12.96; from 6.13 before 6.18.39; from 6.19 before 7.1.4 | NVD |
References
- https://git.kernel.org/stable/c/f6682c23b6fac4780d297ae4662053d17e58fd52patch
- https://git.kernel.org/stable/c/466540e045d01fcacf383a5beb8a2dad2fc53a26patch
- https://git.kernel.org/stable/c/7b429d611060e87752e848851815537963726493patch
- https://git.kernel.org/stable/c/0039bdde36b23ccf1196635f1d52c5490481544dpatch
- https://git.kernel.org/stable/c/0f0a83e26a9c7fd4b243c315ce07161d2496d83dpatch
- https://git.kernel.org/stable/c/a257407e2bbbb099ed427719a50563f67fa366d8patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.