ipv4: stop exception dump when nexthop group shrinks

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-99073
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-23 13:17:31 UTC
Updated2026-10-23 13:17:31 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4ce5dc9316de50e0da84beafe55d1344f829cece f91e472821e32f58b03eb631e20a67157e2b928b git Not specified
CNA Linux Linux affected 4ce5dc9316de50e0da84beafe55d1344f829cece 21cba134c30c17ae55f468b5809336437df5d7e6 git Not specified
CNA Linux Linux affected 4ce5dc9316de50e0da84beafe55d1344f829cece b9a30bb7b831e8c5a47fadbdf1760918aaf009cc git Not specified
CNA Linux Linux affected 4ce5dc9316de50e0da84beafe55d1344f829cece 4f4afc07dcb2edd4f9afa36595373f8cdb9b58c2 git Not specified
CNA Linux Linux affected 6.9 Not specified
CNA Linux Linux unaffected 6.9 semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.57 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.11 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4f4afc07dcb2edd4f9afa36595373f8cdb9b58c2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f91e472821e32f58b03eb631e20a67157e2b928b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/21cba134c30c17ae55f468b5809336437df5d7e6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b9a30bb7b831e8c5a47fadbdf1760918aaf009cc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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