CVE-2024-38621

HIGH
Published Jun 21, 2024 Modified Nov 4, 2025 CWE-787

Description

In the Linux kernel, the following vulnerability has been resolved: media: stk1160: fix bounds checking in stk1160_copy_video() The subtract in this condition is reversed. The ->length is the length of the buffer. The ->bytesused is how many bytes we have copied thus far. When the condition is reversed that means the result of the subtraction is always negative but since it's unsigned then the result is a very high positive value. That means the overflow check is never true. Additionally, the ->bytesused doesn't actually work for this purpose because we're not writing to "buf->mem + buf->bytesused". Instead, the math to calculate the destination where we are writing is a bit involved. You calculate the number of full lines already written, multiply by two, skip a line if necessary so that we start on an odd numbered line, and add the offset into the line. To fix this buffer overflow, just take the actual destination where we are writing, if the offset is already out of bounds print an error and return. Otherwise, write up to buf->length bytes.

Is your site exposed to CVE-2024-38621?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

7.1
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Weakness Type (CWE)

CWE-787 Out-of-bounds Write

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel

References

Advisories & Patches

https://git.kernel.org/stable/c/7532bcec0797adfa08791301c3bcae14141db3bd https://git.kernel.org/stable/c/a08492832cc4cacc24e0612f483c86ca899b9261 https://git.kernel.org/stable/c/a16775828aaed1c54ff4e6fe83e8e4d5c6a50cb7 https://git.kernel.org/stable/c/b504518a397059e1d55c521ba0ea2b545a6c4b52 https://git.kernel.org/stable/c/d410017a7181cb55e4a5c810b32b75e4416c6808 https://git.kernel.org/stable/c/ecf4ddc3aee8ade504c4d36b7b4053ce6093e200 https://git.kernel.org/stable/c/f6a392266276730bea893b55d12940e32a25f56a https://git.kernel.org/stable/c/faa4364bef2ec0060de381ff028d1d836600a381 https://git.kernel.org/stable/c/7532bcec0797adfa08791301c3bcae14141db3bd https://git.kernel.org/stable/c/a08492832cc4cacc24e0612f483c86ca899b9261 https://git.kernel.org/stable/c/a16775828aaed1c54ff4e6fe83e8e4d5c6a50cb7 https://git.kernel.org/stable/c/b504518a397059e1d55c521ba0ea2b545a6c4b52 https://git.kernel.org/stable/c/d410017a7181cb55e4a5c810b32b75e4416c6808 https://git.kernel.org/stable/c/ecf4ddc3aee8ade504c4d36b7b4053ce6093e200 https://git.kernel.org/stable/c/f6a392266276730bea893b55d12940e32a25f56a https://git.kernel.org/stable/c/faa4364bef2ec0060de381ff028d1d836600a381

Frequently Asked Questions

What is CVE-2024-38621? +
In the Linux kernel, the following vulnerability has been resolved: media: stk1160: fix bounds checking in stk1160_copy_video() The subtract in this condition is reversed. The ->length is the length of the buffer. The ->bytesused is how many bytes we have copied thus far. When the condition is reversed that means the result of the subtraction is always negative but since it's unsigned then the result is a very high positive value. That means the overflow check is never true. Additionally, the ->bytesused doesn't actually work for this purpose because we're not writing to "buf->mem + buf->bytesused". Instead, the math to calculate the destination where we are writing is a bit involved. You calculate the number of full lines already written, multiply by two, skip a line if necessary so that we start on an odd numbered line, and add the offset into the line. To fix this buffer overflow, just take the actual destination where we are writing, if the offset is already out of bounds print an error and return. Otherwise, write up to buf->length bytes. It has a CVSS v3.1 base score of 7.1 (HIGH).
How severe is CVE-2024-38621? +
CVE-2024-38621 has a CVSS v3.1 score of 7.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.
What products are affected by CVE-2024-38621? +
CVE-2024-38621 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-2024-38621? +
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.

Related Vulnerabilities

CVE-2026-8358

LibreOffice Calc can import tracked changes from a spreadsheet document. A heap buffer overflow existed when a document reused the …
CVE-2026-8356

LibreOffice can import presentations in the legacy binary PPT format. A stack buffer overflow existed when importing a colour-replacement record. …
CVE-2026-6040

A heap use-after-free existed when importing the blank-width characters of an ODF number format. A position value read from the …
CVE-2026-6039

LibreOffice can import drawings in the DXF format used by CAD software. A heap buffer overflow existed when importing a …
CVE-2026-3298

The method "sock_recvfrom_into()" of "asyncio.ProacterEventLoop" (Windows only) was missing a boundary check for the data buffer when using nbytes parameter. …
CVE-2026-40489

editorconfig-core-c is an EditorConfig core library for use by plugins supporting EditorConfig parsing. Versions up to and including 0.12.10 have …

Don't wait for an exploit

Scan your website for vulnerabilities like CVE-2024-38621 — free, no signup required.