CVE-2025-38737 cifs: Fix oops due to uninitialised variable
Critical 9.8
Published
Updated
Check this codebase for CVE-2025-38737 and fix it if it is affected.
What it is: CVE-2025-38737 is a critical vulnerability in Linux kernel, published on 5 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-38737 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-2025-38737/ (Markdown: https://insights.sbomify.com/CVE-2025-38737/index.md)
An uninitialized variable in the Linux kernel CIFS module can cause a system crash, requiring a kernel patch to prevent denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-38737?
CVE-2025-38737 is a critical vulnerability in Linux kernel, published on 5 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
cifs: Fix oops due to uninitialised variable
Fix smb3_init_transform_rq() to initialise buffer to NULL before calling netfs_alloc_folioq_buffer() as netfs assumes it can append to the buffer it is given. Setting it to NULL means it should start a fresh buffer, but the value is currently undefined.
Weakness: CWE-908
Which versions are affected by CVE-2025-38737?
It affects 1 product.
Linux distribution packages (40)
kernel Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-64k Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-64k-core Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-64k-debug Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-64k-debug-core Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-64k-debug-debuginfo Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-64k-debug-devel Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-64k-debug-devel-matched Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-64k-debug-modules Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-64k-debug-modules-core Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-64k-debug-modules-extra Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-64k-debuginfo Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-64k-devel Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-64k-devel-matched Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-64k-modules Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-64k-modules-core Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-64k-modules-extra Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-abi-stablelists Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-core Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-debug Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-debug-core Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-debug-debuginfo Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-debug-devel Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-debug-devel-matched Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-debug-modules Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-debug-modules-core Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-debug-modules-extra Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-debug-uki-virt Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-debuginfo Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-debuginfo-common-aarch64 Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-debuginfo-common-ppc64le Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-debuginfo-common-s390x Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-debuginfo-common-x86_64 Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-devel Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-devel-matched Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-doc Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-modules Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-modules-core Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-modules-extra Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
kernel-rt Red Hat:enterprise_linux_eus:10.0 | All versions | 0:6.12.0-55.48.1.el10_0 |
Products include Linux kernel.
How do I fix CVE-2025-38737?
Apply the vendor's patch.
Is CVE-2025-38737 being exploited?
There is no known exploitation of CVE-2025-38737 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-38737, DEBIAN-CVE-2025-38737, GHSA-86v2-3hvm-7hww, RHSA-2025:23009, ROOT-OS-DEBIAN-13-CVE-2025-38737, UBUNTU-CVE-2025-38737.