CVE-2026-93204: Linux kernel · batman-adv: dat: atomically update mac addresses
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 13:47 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 17 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 is available that uses atomic64_t for atomic updates of MAC addresses in the batman-adv module. Users should apply the official patches or updates that address this issue. Since this is a Linux kernel vulnerability, upgrading to patched kernel versions is recommended.
Description
A vulnerability in the Linux kernel's batman-adv module was resolved involving non-atomic updates of MAC addresses. The issue allowed a parallel reader to observe partially updated MAC addresses, potentially causing network issues such as ARP cache poisoning. The fix involved using atomic64_t to ensure atomic updates of the 48-bit MAC address, preventing readers from seeing mixed old and new values.
References
- ubuntu.com/security/CVE-2026-93204 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-93204 (opens in a new tab)
- git.kernel.org/linus/e6de568d3eda3e3c01c868fabd7a9535d5ee4a73 (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-93204 (opens in a new tab)
- git.kernel.org/stable/c/159360a0de831845c4500b4f8638decdcd624040 (opens in a new tab)
- git.kernel.org/stable/c/1674855a5b6eacfe35f4db3095d7055c25467274 (opens in a new tab)
- git.kernel.org/stable/c/181012b3d29c51197c235ee5871fc7512c736855 (opens in a new tab)
- git.kernel.org/stable/c/259db2c04586d40b82c5c3002b1e28b0698a0bb7 (opens in a new tab)
- git.kernel.org/stable/c/66238e2a74eca5dabf85b0cd2c3c944e474dc2fd (opens in a new tab)
- git.kernel.org/stable/c/a5e4d6cb4f6848b8906c1c493f99a8ccc0638515 (opens in a new tab)
- git.kernel.org/stable/c/e6de568d3eda3e3c01c868fabd7a9535d5ee4a73 (opens in a new tab)
- git.kernel.org/stable/c/f68038c77a2f38c09c7e2e4f7fa1f4e246fdf2c9 (opens in a new tab)