CVE-2026-99073
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.
How to fix
- Linux Linuxf91e472821e32f58b03eb631e20a67157e2b928b, 21cba134c30c17ae55f468b5809336437df5d7e6, b9a30bb7b831e8c5a47fadbdf1760918aaf009cc, 4f4afc07dcb2edd4f9afa36595373f8cdb9b58c2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 4ce5dc9316de50e0da84beafe55d1344f829cece ≤ v < f91e472821e32f58b03eb631e20a67157e2b928b, 4ce5dc9316de50e0da84beafe55d1344f829cece ≤ v < 21cba134c30c17ae55f468b5809336437df5d7e6, 4ce5dc9316de50e0da84beafe55d1344f829cece ≤ v < b9a30bb7b831e8c5a47fadbdf1760918aaf009cc, 4ce5dc9316de50e0da84beafe55d1344f829cece ≤ v < 4f4afc07dcb2edd4f9afa36595373f8cdb9b58c2, 6.9 | f91e472821e32f58b03eb631e20a67157e2b928b, 21cba134c30c17ae55f468b5809336437df5d7e6, b9a30bb7b831e8c5a47fadbdf1760918aaf009cc, 4f4afc07dcb2edd4f9afa36595373f8cdb9b58c2 |
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