CVE-2026-80997
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk47th percentile - higher than 47% of all known CVEs
Summary
A bug in the Linux kernel's IPA driver (net: ipa) caused the modem TX queue to stall permanently after runtime resume. ipa_start_xmit() unconditionally stopped the TX queue before calling pm_runtime_get(), relying on a wake scheduled by runtime resume to restart it. However, that wake work ran too early — before the device power state reached RPM_ACTIVE — so the queue was never restarted and transmit stalled permanently.
Risk Assessment
When triggered, the modem TX queue remains permanently stopped, packets accumulate in the qdisc, and the device runtime-suspends. As a result, the cellular data path becomes completely unresponsive — including RX — leading to loss of network connectivity on the device.
Recommendation
Update the Linux kernel to a version containing the fix, which makes the wake work wait for resume completion (pm_runtime_get_sync()) before waking the queue. If updating is not possible, consider temporarily disabling autosuspend for the IPA device or monitoring the TX queue state.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: net: ipa: fix stalled modem TX queue after runtime resume ipa_start_xmit() unconditionally stops the TX queue before calling pm_runtime_get(), relying on the wake scheduled by runtime resume (ipa_modem_wake_queue_work()) to restart it once power is ACTIVE. But that work is queued from within the runtime resume callback, before the device's power state reaches RPM_ACTIVE, so it can run while the device is still RPM_RESUMING. The wake is then consumed too early: the transmit it restarts stops the queue again, pm_runtime_get() returns -EINPROGRESS without arranging any future wake (deferred_resume exists only for RPM_SUSPENDING), and after the resume completes nothing is left to wake the queue. Transmit stalls permanently: packets pile up in the qdisc behind the stopped queue, the device runtime-suspends, and since the netdev registers no ndo_tx_timeout the watchdog never fires. Observed on SM7635 (Fairphone 6) as the cellular data path going permanently deaf within hours, RX included, since nothing resumes the suspended endpoints. Close the window by making the wake work wait for the resume to complete (pm_runtime_get_sync()) before waking the queue. Every queue stop is then guaranteed a later wake that happens while power is ACTIVE; a transmit racing a new suspend/resume cycle re-schedules the work. If the device could not be resumed, wake the queue anyway so pending packets are dropped by the transmit path rather than stranded. The STARTED power flag used to narrow this window: a wake running before the transmit path's stop suppressed that stop, but only once, as the flag was cleared by the first stop it absorbed. Removing the flag made a single transmit during an in-flight resume sufficient to strand the queue, which is the form observed. With an accelerated reproducer (autosuspend delay shortened to 5 ms, ~20 packets/s of TX), an unpatched kernel stalled three times in 230 s / 4380 packets; with this patch the same test ran 3601 s / 70298 packets without a stall.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS