Answer in brief
CVE-2026-64409 records a Medium severity (CVSS 5.5) vulnerability in Bluetooth: btmtksdio: fix infinite loop in btmtksdio_txrx_work(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=26270bc189ea4b5a8356ec99561357fc87f00b32 <f6682c23b6fac4780d297ae4662053d17e58fd52 || >=26270bc189ea4b5a8356ec99561357fc87f00b32 <466540e045d01fcacf383a5beb8a2dad2fc53a26 || >=26270bc189ea4b5a8356ec99561357fc87f00b32 <7b429d611060e87752e848851815537963726493 || >=26270bc189ea4b5a8356ec99561357fc87f00b32 <0039bdde36b23ccf1196635f1d52c5490481544d || >=26270bc189ea4b5a8356ec99561357fc87f00b32 <0f0a83e26a9c7fd4b243c315ce07161d2496d83d || >=26270bc189ea4b5a8356ec99561357fc87f00b32 <a257407e2bbbb099ed427719a50563f67fa366d8 | f6682c23b6fac4780d297ae4662053d17e58fd52, 466540e045d01fcacf383a5beb8a2dad2fc53a26, 7b429d611060e87752e848851815537963726493, 0039bdde36b23ccf1196635f1d52c5490481544d, 0f0a83e26a9c7fd4b243c315ce07161d2496d83d, a257407e2bbbb099ed427719a50563f67fa366d8 |
| Linux/Linuxgeneric | 5.17 | Not reported |
Published upstream
Jul 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 11, 2026
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.
Quoted source text, attributed separately from HOL analysis.