CVE-2025-22005
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk8th percentile - higher than 8% of all known CVEs
Summary
A memory leak was found in the Linux kernel's fib_check_nh_v6_gw() function for IPv6. The issue occurred after moving fib_nh_common_init() before pcpu memory allocation, leaving nhc_pcpu_rth_output uncleaned on allocation failure.
Risk Assessment
The memory leak can gradually exhaust system resources, potentially leading to performance degradation or system crash over time.
Recommendation
Immediately update the Linux kernel to a version containing the fix (commit with the solution). Monitor memory usage on systems with IPv6 enabled.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ipv6: Fix memleak of nhc_pcpu_rth_output in fib_check_nh_v6_gw(). fib_check_nh_v6_gw() expects that fib6_nh_init() cleans up everything when it fails. Commit 7dd73168e273 ("ipv6: Always allocate pcpu memory in a fib6_nh") moved fib_nh_common_init() before alloc_percpu_gfp() within fib6_nh_init() but forgot to add cleanup for fib6_nh->nh_common.nhc_pcpu_rth_output in case it fails to allocate fib6_nh->rt6i_pcpu, resulting in memleak. Let's call fib_nh_common_release() and clear nhc_pcpu_rth_output in the error path. Note that we can remove the fib6_nh_release() call in nh_create_ipv6() later in net-next.git.