Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 4ce5dc9316de50e0da84beafe55d1344f829cece before f91e472821e32f58b03eb631e20a67157e2b928b; affected 4ce5dc9316de50e0da84beafe55d1344f829cece before 21cba134c30c17ae55f468b5809336437df5d7e6; affected 4ce5dc9316de50e0da84beafe55d1344f829cece before b9a30bb7b831e8c5a47fadbdf1760918aaf009cc; affected 4ce5dc9316de50e0da84beafe55d1344f829cece before 4f4afc07dcb2edd4f9afa36595373f8cdb9b58c2 |
| Linux / Linux | affected 6.9; unaffected 0 before 6.9; unaffected 6.12.113 through 6.12.*; unaffected 6.18.57 through 6.18.*; unaffected 7.2.11 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.