CVE-2026-99072
ipv4: stop route notification sizing when nexthop group shrinks
Description
In the Linux kernel, the following vulnerability has been resolved: ipv4: stop route notification sizing when nexthop group shrinks Commit 680aea08e78c ("net: ipv4: Emit notification when fib hardware flags are changed") added an RCU-only fib_nlmsg_size() call for asynchronous hardware flag notifications. fib_nlmsg_size() checks fib_info_num_path() before each iteration, then fib_info_nhc() independently reloads nh->nh_grp. If RTM_NEWNEXTHOP replaces a group with fewer paths between those loads, fib_info_nhc() returns NULL and fib_nexthop_nlmsg_size() dereferences it. Stop sizing when the indexed path is absent. Nexthop groups are dense, so the current snapshot has no later path.
INFO
Published Date :
Oct. 23, 2026, 12:23 p.m.
Last Modified :
Oct. 23, 2026, 12:23 p.m.
Remotely Exploit :
No
Source :
Linux
Solution
- Update the Linux kernel.
- Apply commit 680aea08e78c.
- Rebuild the kernel.
- Reboot the system.
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