Riskcovery

CVE-2026-99073

ipv4: stop exception dump when nexthop group shrinks

State
Published
Severity
Not scored
Published
Oct 23, 2026
Updated
Oct 23, 2026
Reserved
Sep 25, 2026

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

ipv4: stop exception dump when nexthop group shrinks

Commit 4ce5dc9316de ("inet: switch inet_dump_fib() to RCU protection") allowed IPv4 FIB dumps to run concurrently with nexthop replacement.

fib_dump_info_fnhe() uses fib_info_num_path() as the loop bound, 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 the dump dereferences it through nhc_flags.

Stop the walk when the indexed path is absent. Nexthop groups are dense, so the current snapshot has no later path.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 4ce5dc9316de50e0da84beafe55d1344f829cece to before f91e472821e32f58b03eb631e20a67157e2b928bAffected
  • 4ce5dc9316de50e0da84beafe55d1344f829cece to before 21cba134c30c17ae55f468b5809336437df5d7e6Affected
  • 4ce5dc9316de50e0da84beafe55d1344f829cece to before b9a30bb7b831e8c5a47fadbdf1760918aaf009ccAffected
  • 4ce5dc9316de50e0da84beafe55d1344f829cece to before 4f4afc07dcb2edd4f9afa36595373f8cdb9b58c2Affected
LinuxLinux
  • 6.9Affected
  • before 6.9Not affected
  • 6.12.113 through 6.12.*Not affected
  • 6.18.57 through 6.18.*Not affected
  • 7.2.11 through 7.2.*Not affected
  • 7.3 and laterNot affected

References

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