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CVE-2026-98423

Linux: wifi: mac80211_hwsim: don't hand frames to mac80211 while stopping

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.21%Chance of exploitation activity in the next 30 days, higher than 11% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in5ce9b2bc9e73213e316a8c72400256a76bf41814Also 2f59be7585dc81baa6f36b0035dd6848ea43d318, 5c79ef616aa16af582fb2cb93b0f750975a0004f and 1 moreCVE List
Published14 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 5ce9b2bc9e73213e316a8c72400256a76bf41814LinuxCVE List
  • 2f59be7585dc81baa6f36b0035dd6848ea43d318LinuxCVE List
  • 5c79ef616aa16af582fb2cb93b0f750975a0004fLinuxCVE List
  • 87840d4a3a21b1c19b867a80e16ba69dff284de2LinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

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

wifi: mac80211_hwsim: don't hand frames to mac80211 while stopping

The code checks ->started for frames coming from wmediumd, but the radio can be stopped after the check and before frame delivery, causing mac80211 to hit the WARN_ON(!local->started).

Expand the mutex for this case and synchronise against it when the radio is stopped to avoid being able to hit the warning with hwsim.

Drop the error print that would've complicated the error path, it only triggers for allocation failures (already noisy) and malformed frames anyway.

Text from CVE List

Affected versions 14

  • Linuxaffected: 7882513bacb176ab4aacceefdd035ca9479da4fb before 5ce9b2bc9e73213e316a8c72400256a76bf41814CVE List
  • Linuxaffected: 7882513bacb176ab4aacceefdd035ca9479da4fb before c4e4fe330294e3936e0f4e15d6996468f8a45fb2CVE List
  • Linuxaffected: 7882513bacb176ab4aacceefdd035ca9479da4fb before 2f59be7585dc81baa6f36b0035dd6848ea43d318CVE List
  • Linuxaffected: 7882513bacb176ab4aacceefdd035ca9479da4fb before 5c79ef616aa16af582fb2cb93b0f750975a0004fCVE List
  • Linuxaffected: 7882513bacb176ab4aacceefdd035ca9479da4fb before d7fa45d8123a7f794b93fc22dbcf19f38dc4d8cbCVE List
  • Linuxaffected: 7882513bacb176ab4aacceefdd035ca9479da4fb before 87840d4a3a21b1c19b867a80e16ba69dff284de2CVE List
  • Linuxaffected: 3.1CVE List
  • Linuxunaffected: all versions before 3.1CVE List
  • Linuxunaffected: 6.1.189 through 6.1.*CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.112 through 6.12.*CVE List
  • Linuxunaffected: 6.18.54 through 6.18.*CVE List
  • Linuxunaffected: 7.2.8 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 6