Description
In the Linux kernel, the following vulnerability has been resolved: ipv4: fib: Don't ignore error route in local/main tables. When CONFIG_IP_MULTIPLE_TABLES is enabled but no rule is added, fib_lookup() performs route lookup directly on two tables. Since the first lookup does not properly bail out, the result of an error route in the merged local/main table could be overwritten by another route in the default table: # unshare -n # ip link set lo up # ip route add 192.168.0.0/24 dev lo table 253 # ip route add unreachable 192.168.0.0/24 # ip route get 192.168.0.1 192.168.0.1 dev lo table default uid 0 cache <local> Once a random rule is added, the error route is respected: # ip rule add table 0 # ip rule del table 0 # ip route get 192.168.0.1 RTNETLINK answers: No route to host Let's fix the inconsistent behaviour.
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
f4530fa574df4d833506c53697ed1daa0d390bf4 to < a29e95fbc51e8a1b932773fd0e259b2080881443affectedf4530fa574df4d833506c53697ed1daa0d390bf4 to < 5ae18d87a45698e8244d0fcba64c658c35a7dd3daffectedf4530fa574df4d833506c53697ed1daa0d390bf4 to < 9127589aabdee588278e8d0d0bd3709a760a92c8affectedf4530fa574df4d833506c53697ed1daa0d390bf4 to < 49eaf1403201357762d745a35882fb734107d763affectedf4530fa574df4d833506c53697ed1daa0d390bf4 to < fd25996f57a95d56bc568c89b4921edcf334b7d8affectedf4530fa574df4d833506c53697ed1daa0d390bf4 to < 828fad4fd418bcdb9f5d66fec0d184c52a85ec31affectedf4530fa574df4d833506c53697ed1daa0d390bf4 to < a668fa160247d7bbe921548cb845f607b8b9305faffectedf4530fa574df4d833506c53697ed1daa0d390bf4 to < b72f0db64205d9ce462038ba995d5d31eff32dc1affected
Linux Linux
Default version status: affected
3.6affected0 to < 3.6unaffected5.10.261 to ≤ 5.10.*unaffected5.15.212 to ≤ 5.15.*unaffected6.1.178 to ≤ 6.1.*unaffected6.6.145 to ≤ 6.6.*unaffected6.12.97 to ≤ 6.12.*unaffected6.18.40 to ≤ 6.18.*unaffected7.1.5 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/a29e95fbc51e8a1b932773fd0e259b2080881443 ↗
- https://git.kernel.org/stable/c/5ae18d87a45698e8244d0fcba64c658c35a7dd3d ↗
- https://git.kernel.org/stable/c/9127589aabdee588278e8d0d0bd3709a760a92c8 ↗
- https://git.kernel.org/stable/c/49eaf1403201357762d745a35882fb734107d763 ↗
- https://git.kernel.org/stable/c/fd25996f57a95d56bc568c89b4921edcf334b7d8 ↗
- https://git.kernel.org/stable/c/828fad4fd418bcdb9f5d66fec0d184c52a85ec31 ↗
- https://git.kernel.org/stable/c/a668fa160247d7bbe921548cb845f607b8b9305f ↗
- https://git.kernel.org/stable/c/b72f0db64205d9ce462038ba995d5d31eff32dc1 ↗