CVE-2026-72421
CVE CVE-2026-72421EUVD EUVD-2026-59320Published 2026-08-15T05:56:40.000ZLast changed 2026-08-17T05:44:01.000ZCVSS 10.0
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 6.6.145; patch: 7.2; patch: 0; patch: 5.10.261; patch: 6.18.40; f4530fa574df4d833506c53697ed1daa0d390bf4 <5ae18d87a45698e8244d0fcba64c658c35a7dd3d; f4530fa574df4d833506c53697ed1daa0d390bf4 <9127589aabdee588278e8d0d0bd3709a760a92c8; patch: 6.1.178; f4530fa574df4d833506c53697ed1daa0d390bf4 <b72f0db64205d9ce462038ba995d5d31eff32dc1; f4530fa574df4d833506c53697ed1daa0d390bf4 <a668fa160247d7bbe921548cb845f607b8b9305f; 3.6; f4530fa574df4d833506c53697ed1daa0d390bf4 <828fad4fd418bcdb9f5d66fec0d184c52a85ec31; patch: 5.15.212; f4530fa574df4d833506c53697ed1daa0d390bf4 <fd25996f57a95d56bc568c89b4921edcf334b7d8; f4530fa574df4d833506c53697ed1daa0d390bf4 <a29e95fbc51e8a1b932773fd0e259b2080881443; patch: 7.1.5; f4530fa574df4d833506c53697ed1daa0d390bf4 <49eaf1403201357762d745a35882fb734107d763; patch: 6.12.97
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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