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.
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
680aea08e78c003292415518ad270bc20f9c80b1 to < 72d9d17092bb37b0717f12042a0817d01a1f9e78affected680aea08e78c003292415518ad270bc20f9c80b1 to < ad1c9f1b98c92609e9bb2ae8f05916defc3b0a54affected680aea08e78c003292415518ad270bc20f9c80b1 to < c1f48d1c2d5e9efd904dbbc2f2b3d41543e55c49affected680aea08e78c003292415518ad270bc20f9c80b1 to < ad2b3a68b8a7d5d27de88e05674e4adb1ce46d88affected680aea08e78c003292415518ad270bc20f9c80b1 to < d3daa33c7af92e38f2274bbd2576f58bfbaf89e6affected
Linux Linux
Default version status: affected
5.12affected0 to < 5.12unaffected6.6.160 to ≤ 6.6.*unaffected6.12.113 to ≤ 6.12.*unaffected6.18.57 to ≤ 6.18.*unaffected7.2.11 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/72d9d17092bb37b0717f12042a0817d01a1f9e78 ↗
- https://git.kernel.org/stable/c/ad1c9f1b98c92609e9bb2ae8f05916defc3b0a54 ↗
- https://git.kernel.org/stable/c/c1f48d1c2d5e9efd904dbbc2f2b3d41543e55c49 ↗
- https://git.kernel.org/stable/c/ad2b3a68b8a7d5d27de88e05674e4adb1ce46d88 ↗
- https://git.kernel.org/stable/c/d3daa33c7af92e38f2274bbd2576f58bfbaf89e6 ↗