CVE-2026-72421Critical· 10.0▾ MidnightIn 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 o…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 55 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.6%
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:
192.168.0.1 dev lo table default uid 0 cache <local>
Once a random rule is added, the error route is respected:
RTNETLINK answers: No route to host
Let's fix the inconsistent behaviour.
Linux >= f4530fa574df4d833506c53697ed1daa0d390bf4 < a29e95fbc51e8a1b932773fd0e259b2080881443Linux >= f4530fa574df4d833506c53697ed1daa0d390bf4 < 5ae18d87a45698e8244d0fcba64c658c35a7dd3dLinux >= f4530fa574df4d833506c53697ed1daa0d390bf4 < 9127589aabdee588278e8d0d0bd3709a760a92c8Linux >= f4530fa574df4d833506c53697ed1daa0d390bf4 < 49eaf1403201357762d745a35882fb734107d763Linux >= f4530fa574df4d833506c53697ed1daa0d390bf4 < fd25996f57a95d56bc568c89b4921edcf334b7d8Linux >= f4530fa574df4d833506c53697ed1daa0d390bf4 < 828fad4fd418bcdb9f5d66fec0d184c52a85ec31Linux >= f4530fa574df4d833506c53697ed1daa0d390bf4 < a668fa160247d7bbe921548cb845f607b8b9305fLinux >= f4530fa574df4d833506c53697ed1daa0d390bf4 < b72f0db64205d9ce462038ba995d5d31eff32dc1Linux 3.6Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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