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CVE-2026-99070

Linux: ipv6: do not warn on route notification size race

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)No scoreNo FIRST EPSS score in this snapshot yet
Fixed in8a3b935b6b6037eefb36bd27a60793a008358e8dAlso 7b112bd43f1172fb152e848570a957467008a5ae, 4ac7d92a4698e34e614c254359665b9de1f65283 and 1 moreCVE List
Published23 Oct 2026Updated 23 Oct 2026CVE List

What fixes it

  • 8a3b935b6b6037eefb36bd27a60793a008358e8dLinuxCVE List
  • 7b112bd43f1172fb152e848570a957467008a5aeLinuxCVE List
  • 4ac7d92a4698e34e614c254359665b9de1f65283LinuxCVE List
  • 291fe0bafee78c95f9f2e7f579f17793fd5a1e5aLinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

In the Linux kernel, the following vulnerability has been resolved:

ipv6: do not warn on route notification size race

fib6_info_hw_flags_set() sizes the skb with rt6_nlmsg_size() and later fills it with rt6_fill_node(). With nexthop compatibility mode enabled, a concurrent replacement can grow the group between these independent snapshots. rt6_fill_node() can then legitimately return -EMSGSIZE, so the warning does not prove a sizing bug.

Remove the warning. The existing error path still frees the skb and reports the error to listeners.

Text from CVE List

Affected versions 12

  • Linuxaffected: 907eea486888cfe118c19759bbc4b8fca2e004df before 8a3b935b6b6037eefb36bd27a60793a008358e8dCVE List
  • Linuxaffected: 907eea486888cfe118c19759bbc4b8fca2e004df before 7b112bd43f1172fb152e848570a957467008a5aeCVE List
  • Linuxaffected: 907eea486888cfe118c19759bbc4b8fca2e004df before 4ac7d92a4698e34e614c254359665b9de1f65283CVE List
  • Linuxaffected: 907eea486888cfe118c19759bbc4b8fca2e004df before 291fe0bafee78c95f9f2e7f579f17793fd5a1e5aCVE List
  • Linuxaffected: 907eea486888cfe118c19759bbc4b8fca2e004df before c97426ec649d99596d8969e1a052c16b14b7b485CVE List
  • Linuxaffected: 5.12CVE List
  • Linuxunaffected: all versions before 5.12CVE List
  • Linuxunaffected: 6.6.160 through 6.6.*CVE List
  • Linuxunaffected: 6.12.113 through 6.12.*CVE List
  • Linuxunaffected: 6.18.57 through 6.18.*CVE List
  • Linuxunaffected: 7.2.11 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 5