CVE-2025-38550 ipv6: mcast: Delay put pmc->idev in mld_del_delrec()
High 7.8
Published
Updated
Check this codebase for CVE-2025-38550 and fix it if it is affected.
What it is: CVE-2025-38550 is a high-severity use after free vulnerability in Debian Debian Linux, published on 16 Aug 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-38550 in the wild and no public exploit code.
Affected product: Debian Debian Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2025-38550/ (Markdown: https://insights.sbomify.com/CVE-2025-38550/index.md)
A use-after-free vulnerability in the Linux kernel IPv6 multicast code allows attackers to cause denial of service or potentially execute code.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-38550?
CVE-2025-38550 is a high-severity use after free vulnerability in Debian Debian Linux, published on 16 Aug 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
ipv6: mcast: Delay put pmc->idev in mld_del_delrec()
pmc->idev is still used in ip6_mc_clear_src(), so as mld_clear_delrec() does, the reference should be put after ip6_mc_clear_src() return.
Which versions are affected by CVE-2025-38550?
It affects 2 products.
Linux distribution packages (40)
kernel AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-64k AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-64k-core AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-64k-debug AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-64k-debug-core AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-64k-debug-devel AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-64k-debug-devel-matched AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-64k-debug-modules AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-64k-debug-modules-core AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-64k-debug-modules-extra AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-64k-devel AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-64k-devel-matched AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-64k-modules AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-64k-modules-core AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-64k-modules-extra AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-abi-stablelists AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-core AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-cross-headers AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-debug AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-debug-core AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-debug-devel AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-debug-devel-matched AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-debug-modules AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-debug-modules-core AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-debug-modules-extra AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-debug-uki-virt AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-devel AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-devel-matched AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-doc AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-headers AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-modules AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-modules-core AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-modules-extra AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-rt AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-rt-64k AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-rt-64k-core AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-rt-64k-debug AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-rt-64k-debug-core AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-rt-64k-debug-devel AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
kernel-rt-64k-debug-modules AlmaLinux:9 | All versions | 5.14.0-570.44.1.el9_6 |
Products include Debian Debian Linux, Linux kernel.
How do I fix CVE-2025-38550?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2025-38550 being exploited?
There is no known exploitation of CVE-2025-38550 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as ALSA-2025:15740, AZL-66335, AZL-73584, BELL-CVE-2025-38550, DEBIAN-CVE-2025-38550, GHSA-j928-v9rj-pq95 and 6 more.