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CVE-2026-98702

Linux: wifi: mac80211: reject invalid 320 MHz CSA bandwidth

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)0.17%Chance of exploitation activity in the next 30 days, higher than 5% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in1892e71aa2e5ee667d87c6e49e3661f5e290303bAlso 79b3ce0d881cd6e5d4d3496b19f5cc5e7089a56c, 56e236759f0a8dc910c2ae7cd3c161f298ee5794CVE List
Published18 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 1892e71aa2e5ee667d87c6e49e3661f5e290303bLinuxCVE List
  • 79b3ce0d881cd6e5d4d3496b19f5cc5e7089a56cLinuxCVE List
  • 56e236759f0a8dc910c2ae7cd3c161f298ee5794LinuxCVE 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: reject invalid 320 MHz CSA bandwidth

The HT/VHT channel definition validator can receive a 320 MHz bandwidth indication from a received CSA frame on a non-6 GHz link. It warns for this unsupported width but continues with an uninitialized vht_operation.chan_width, which is then read by ieee80211_chandef_vht_oper(). With panic_on_warn enabled, this lets a received frame panic the kernel.

Reject the channel definition before entering the VHT operation conversion. This preserves the existing CSA fallback while avoiding both the warning and the uninitialized read.

Text from CVE List

Affected versions 10

  • Linuxaffected: 21c3f8f95554feff9bed15703e89adbe582e0383 before cf0ddacce173890407ed3fa50c8ea9b3c0cc0e16CVE List
  • Linuxaffected: 21c3f8f95554feff9bed15703e89adbe582e0383 before 1892e71aa2e5ee667d87c6e49e3661f5e290303bCVE List
  • Linuxaffected: 21c3f8f95554feff9bed15703e89adbe582e0383 before 79b3ce0d881cd6e5d4d3496b19f5cc5e7089a56cCVE List
  • Linuxaffected: 21c3f8f95554feff9bed15703e89adbe582e0383 before 56e236759f0a8dc910c2ae7cd3c161f298ee5794CVE List
  • Linuxaffected: 6.9CVE List
  • Linuxunaffected: all versions before 6.9CVE List
  • Linuxunaffected: 6.12.113 through 6.12.*CVE List
  • Linuxunaffected: 6.18.56 through 6.18.*CVE List
  • Linuxunaffected: 7.2.10 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 4