CVE-2026-31548

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

wifi: cfg80211: cancel pmsr_free_wk in cfg80211_pmsr_wdev_down

When the nl80211 socket that originated a PMSR request is

closed, cfg80211_release_pmsr() sets the request's nl_portid

to zero and schedules pmsr_free_wk to process the abort

asynchronously. If the interface is concurrently torn down

before that work runs, cfg80211_pmsr_wdev_down() calls

cfg80211_pmsr_process_abort() directly. However, the already-

scheduled pmsr_free_wk work item remains pending and may run

after the interface has been removed from the driver. This

could cause the driver's abort_pmsr callback to operate on a

torn-down interface, leading to undefined behavior and

potential crashes.

Cancel pmsr_free_wk synchronously in cfg80211_pmsr_wdev_down()

before calling cfg80211_pmsr_process_abort(). This ensures any

pending or in-progress work is drained before interface teardown

proceeds, preventing the work from invoking the driver abort

callback

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References