CVE-2026-53107: wifi: libertas: don't kill URBs in interrupt context

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-24 · updated 2026-07-23

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: libertas: don't kill URBs in interrupt context Serialization for the TX path was enforced by calling usb_kill_urb()/usb_kill_anchored_urbs(), to prevent transmission before a previous URB was completed. usb_tx_block() can be called from interrupt context (e.g. in the HCD giveback path), so we can't always use it to kill in-flight URBs. Prevent sleeping during interrupt context by checking the tx_submitted anchor for existing URBs. We now return -EBUSY, to indicate there's a pending request.

Affected products

Linux kernel: from 5.10.252 before 5.11; from 5.15.202 before 5.16; from 6.1.165 before 6.2; from 6.6.128 before 6.7; from 6.12.75 before 6.13; from 6.18.16 before 6.18.33 — fixed in 5.11, 5.16, 6.13, 6.18.33, 6.2, 6.7

How to fix

Upgrade to a fixed version: Linux kernel 5.11, 5.16, 6.13, 6.18.33. Check the vendor advisory for mitigations.

References

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