CVE-2025-21964 cifs: Fix integer overflow while processing acregmax mount option
Medium 5.5
Published
Updated
Check this codebase for CVE-2025-21964 and fix it if it is affected.
What it is: CVE-2025-21964 is a medium-severity vulnerability in Linux kernel, published on 1 Apr 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-2025-21964 in the wild and no public exploit code.
Affected product: Linux kernel. 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-2025-21964/ (Markdown: https://insights.sbomify.com/CVE-2025-21964/index.md)
An integer overflow in the Linux kernel CIFS module during mount option processing can lead to a denial of service.
- 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-2025-21964?
CVE-2025-21964 is a medium-severity vulnerability in Linux kernel, published on 1 Apr 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:
cifs: Fix integer overflow while processing acregmax mount option
User-provided mount parameter acregmax of type u32 is intended to have an upper limit, but before it is validated, the value is converted from seconds to jiffies which can lead to an integer overflow.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Weakness: CWE-190
Which versions are affected by CVE-2025-21964?
It affects 1 product.
Linux distribution packages (40)
kernel AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-64k AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-64k-core AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-64k-debug AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-64k-debug-core AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-64k-debug-devel AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-64k-debug-devel-matched AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-64k-debug-modules AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-64k-debug-modules-core AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-64k-debug-modules-extra AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-64k-devel AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-64k-devel-matched AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-64k-modules AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-64k-modules-core AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-64k-modules-extra AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-abi-stablelists AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-core AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-cross-headers AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-debug AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-debug-core AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-debug-devel AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-debug-devel-matched AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-debug-modules AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-debug-modules-core AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-debug-modules-extra AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-debug-uki-virt AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-devel AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-devel-matched AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-doc AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-headers AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-modules AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-modules-core AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-modules-extra AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-rt AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-rt-64k AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-rt-64k-core AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-rt-64k-debug AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-rt-64k-debug-core AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-rt-64k-debug-devel AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
kernel-rt-64k-debug-modules AlmaLinux:9 | All versions | 5.14.0-570.18.1.el9_6 |
Products include Linux kernel.
How do I fix CVE-2025-21964?
Apply the vendor's patch.
Is CVE-2025-21964 being exploited?
There is no known exploitation of CVE-2025-21964 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as ALSA-2025:8142, AZL-60278, AZL-60324, BELL-CVE-2025-21964, DEBIAN-CVE-2025-21964, GHSA-mp83-3fxr-m45v and 4 more.