CVE-2026-98702: Linux kernel · wifi: mac80211: reject invalid 320 MHz CSA bandwidth
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in cf0ddacce173890407ed3fa50c8ea9b3c0cc0e16 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 14:05 UTC
Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in cf0ddacce173890407ed3fa50c8ea9b3c0cc0e16, 1892e71aa2e5ee667d87c6e49e3661f5e290303b, 79b3ce0d881cd6e5d4d3496b19f5cc5e7089a56c +1
Exploitation evidence
Disclosed: evidence found.
CVE published 18 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade Linux kernel to cf0ddacce173890407ed3fa50c8ea9b3c0cc0e16, 1892e71aa2e5ee667d87c6e49e3661f5e290303b, 79b3ce0d881cd6e5d4d3496b19f5cc5e7089a56c or 56e236759f0a8dc910c2ae7cd3c161f298ee5794.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A fix is available in the Linux kernel versions identified by the fixed commit hashes. Users should update to a kernel version that includes these fixes to prevent kernel panics caused by invalid CSA frames. No additional mitigation is required if the fix is applied.
Description
A vulnerability in the Linux kernel's mac80211 wifi subsystem allows a received Channel Switch Announcement (CSA) frame with an invalid 320 MHz bandwidth indication on a non-6 GHz link to cause a kernel panic when panic_on_warn is enabled. This occurs due to an uninitialized read of vht_operation.chan_width after the validator warns but does not reject the invalid bandwidth. The issue has been fixed by rejecting the invalid channel definition before processing the VHT operation conversion.
References
- git.kernel.org/stable/c/cf0ddacce173890407ed3fa50c8ea9b3c0cc0e16 (opens in a new tab)
- git.kernel.org/stable/c/1892e71aa2e5ee667d87c6e49e3661f5e290303b (opens in a new tab)
- git.kernel.org/stable/c/79b3ce0d881cd6e5d4d3496b19f5cc5e7089a56c (opens in a new tab)
- git.kernel.org/stable/c/56e236759f0a8dc910c2ae7cd3c161f298ee5794 (opens in a new tab)