CVE-2026-99073
ipv4: stop exception dump when nexthop group shrinks
Description
In the Linux kernel, the following vulnerability has been resolved: ipv4: stop exception dump when nexthop group shrinks Commit 4ce5dc9316de ("inet: switch inet_dump_fib() to RCU protection") allowed IPv4 FIB dumps to run concurrently with nexthop replacement. fib_dump_info_fnhe() uses fib_info_num_path() as the loop bound, 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 the dump dereferences it through nhc_flags. Stop the walk 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 to the resolved version.
- Reboot the system after applying updates.
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