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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
4ce5dc9316de50e0da84beafe55d1344f829cece to < f91e472821e32f58b03eb631e20a67157e2b928baffected4ce5dc9316de50e0da84beafe55d1344f829cece to < 21cba134c30c17ae55f468b5809336437df5d7e6affected4ce5dc9316de50e0da84beafe55d1344f829cece to < b9a30bb7b831e8c5a47fadbdf1760918aaf009ccaffected4ce5dc9316de50e0da84beafe55d1344f829cece to < 4f4afc07dcb2edd4f9afa36595373f8cdb9b58c2affected
Linux Linux
Default version status: affected
6.9affected0 to < 6.9unaffected6.12.113 to ≤ 6.12.*unaffected6.18.57 to ≤ 6.18.*unaffected7.2.11 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected