CVE-2026-72421 (GCVE-0-2026-72421)
Vulnerability from cvelistv5
Published
2026-08-15 05:56
Modified
2026-10-16 18:55
Severity ?
10.0 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: f4530fa574df4d833506c53697ed1daa0d390bf4
Version: f4530fa574df4d833506c53697ed1daa0d390bf4
Version: f4530fa574df4d833506c53697ed1daa0d390bf4
Version: f4530fa574df4d833506c53697ed1daa0d390bf4
Version: f4530fa574df4d833506c53697ed1daa0d390bf4
Version: f4530fa574df4d833506c53697ed1daa0d390bf4
Version: f4530fa574df4d833506c53697ed1daa0d390bf4
Version: f4530fa574df4d833506c53697ed1daa0d390bf4
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  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.