CVE-2026-99070: Linux kernel · ipv6: do not warn on route notification size race
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 28 Oct 2026, 01:42 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Exploitation evidence
Disclosed: evidence found.
CVE published 23 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
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.10linuxpkg:deb/ubuntu/linux?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-oraclepkg:deb/ubuntu/linux-oracle?arch=source&distro=stonkingOther 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
The issue has been resolved by removing the incorrect warning in the Linux kernel source. Users should apply the updated kernel versions containing this fix. No additional action is required as the existing error handling continues to function correctly.
Description
A Linux kernel vulnerability related to IPv6 route notification size warnings has been addressed. The issue involves a race condition in fib6_info_hw_flags_set() where skb sizing and filling operations can mismatch due to concurrent changes, causing incorrect warnings. The fix removes the misleading warning while preserving error handling.
References
- ubuntu.com/security/CVE-2026-99070 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-99070 (opens in a new tab)
- git.kernel.org/stable/c/291fe0bafee78c95f9f2e7f579f17793fd5a1e5a (opens in a new tab)
- git.kernel.org/stable/c/4ac7d92a4698e34e614c254359665b9de1f65283 (opens in a new tab)
- git.kernel.org/stable/c/7b112bd43f1172fb152e848570a957467008a5ae (opens in a new tab)
- git.kernel.org/stable/c/8a3b935b6b6037eefb36bd27a60793a008358e8d (opens in a new tab)
- git.kernel.org/stable/c/c97426ec649d99596d8969e1a052c16b14b7b485 (opens in a new tab)