CVE-2026-93226: Linux kernel · ipv6: use RCU iterator to dump route exceptions
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 14:05 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 7% 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 has been implemented in the Linux kernel by changing the iteration method to use hlist_for_each_entry_rcu() for safe RCU-protected list traversal. Users should update to a kernel version that includes this fix. Since this is a kernel-level concurrency issue, applying the official kernel update is the recommended remediation.
Description
A race condition vulnerability in the Linux kernel's IPv6 routing exception handling was resolved by using a safe RCU iterator. The function rt6_nh_dump_exceptions() previously used an unsafe iteration method over RCU-protected exception lists, leading to a data race when concurrent modifications occurred. This issue was detected by the Kernel Concurrency Sanitizer and fixed by switching to hlist_for_each_entry_rcu() for safe iteration.
References
- ubuntu.com/security/CVE-2026-93226 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-93226 (opens in a new tab)
- git.kernel.org/stable/c/47cdab0d51aaa9bd85f8e4904585bd5bd4df4488 (opens in a new tab)
- git.kernel.org/stable/c/f6b1b15848fd91fe122dac0d19d3d666e35075b6 (opens in a new tab)
- git.kernel.org/stable/c/9c6be625e1a7258e845d6193b3b6b084a00f8e9e (opens in a new tab)
- git.kernel.org/stable/c/3665abc3d2ae8a78cb67f858e848481432ec75db (opens in a new tab)
- git.kernel.org/stable/c/a602cd128d17a793e12888edc8eda85821ede7e1 (opens in a new tab)
- git.kernel.org/stable/c/6bd3f94ed858f2d072627546b4cdf712b0f8ea88 (opens in a new tab)
- git.kernel.org/stable/c/dffbfb3117138e8e0e09d05f507bd36ca1f696e5 (opens in a new tab)
- git.kernel.org/stable/c/eda56ee17713f9dd834b922f7dbfa2e25fa6358c (opens in a new tab)
- msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-93226.json (opens in a new tab)
- support.microsoft.com/lifecycle (opens in a new tab)
- first.org/cvss (opens in a new tab)