CVE-2026-99073
UnknownSummary
In the Linux kernel IPv4 subsystem, a null-ptr-deref occurs during FIB exception dump when a nexthop group shrinks. 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 the group with fewer paths, fib_info_nhc() returns NULL and the dump dereferences it. The fix stops the walk when the indexed path is absent.
Risk Assessment
This can lead to a kernel oops during FIB dump operations, causing network service unavailability. It requires privileges to modify nexthops, so risk is limited to privileged users or environments with unprivileged namespaces.
Recommendation
Update the Linux kernel to a version containing the fix. Monitor systems for unexpected crashes related to FIB operations.
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- CVE-2026-99241Unknown
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS