CVE-2025-22005: linux kernel — Fix

Description

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.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-401 CWE-401

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.3 — 5.4.292
linux	linux_kernel	5.5 — 5.10.236
linux	linux_kernel	5.16 — 6.1.132
linux	linux_kernel	6.2 — 6.6.85
linux	linux_kernel	6.7 — 6.12.21
linux	linux_kernel	6.13 — 6.13.9
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/119dcafe36795a15ae53351cbbd6177aaf94ffef https://git.kernel.org/stable/c/16267a5036173d0173377545b4b6021b081d0933 https://git.kernel.org/stable/c/1bd12dfc058e1e68759d313d7727d68dbc1b8964 https://git.kernel.org/stable/c/29d91820184d5cbc70f3246d4911d96eaeb930d6 https://git.kernel.org/stable/c/596a883c4ce2d2e9c175f25b98fed3a1f33fea38 https://git.kernel.org/stable/c/77c41cdbe6bce476e08d3251c0d501feaf10a9f3 https://git.kernel.org/stable/c/9740890ee20e01f99ff1dde84c63dcf089fabb98 https://git.kernel.org/stable/c/d3d5b4b5ae263c3225db363ba08b937e2e2b0380

Other References

https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html

Frequently Asked Questions

What is CVE-2025-22005? +

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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-22005? +

CVE-2025-22005 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-22005? +

CVE-2025-22005 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-22005? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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