CVE-2026-93802: Linux kernel · wifi: rsi: validate beacon length before fixed buffer copy
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 12:30 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 24 Sep 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
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix for this vulnerability has been implemented in the Linux kernel. Users should apply the official kernel updates that include the patch for CVE-2026-93802. Since this is not a cloud service, remediation requires updating affected Linux kernel versions. No additional mitigation steps are indicated.
Description
A vulnerability in the Linux kernel's wifi RSI driver was resolved by validating the beacon length before copying it into a fixed-size buffer. The issue involved copying the mac80211 beacon frame into a management skb whose tailroom might be smaller than expected, potentially causing buffer issues. The fix ensures the beacon length is checked against the actual tailroom before copying and adjusts ownership handling on error to match existing cleanup paths.
References
- ubuntu.com/security/CVE-2026-93802 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-93802 (opens in a new tab)
- git.kernel.org/stable/c/87710ad633ce4588aec88611d0d0745eb33a6991 (opens in a new tab)
- git.kernel.org/stable/c/8ecdeb8b8a33b22c597299043c0dcfce50beb9ea (opens in a new tab)
- git.kernel.org/stable/c/266f195d5a14eec6c482fd09fbc924584c3371a7 (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-93802 (opens in a new tab)
- git.kernel.org/stable/c/66a964432b2758a4cf69962366e37581d6e70632 (opens in a new tab)
- git.kernel.org/stable/c/795ba65f46fe44061f1195951c122cc8ec685d44 (opens in a new tab)
- git.kernel.org/stable/c/7f99742c3c2801f8033d8b7a0a58254d7f24fb1e (opens in a new tab)
- git.kernel.org/stable/c/f08d7f3c916335a0e539f1c45c130615967fac47 (opens in a new tab)