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.
References
Configurations
Configuration 1 (hide)
|
History
17 Sep 2025, 16:57
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://git.kernel.org/stable/c/7532bcec0797adfa08791301c3bcae14141db3bd - Patch | |
| References | () https://git.kernel.org/stable/c/a08492832cc4cacc24e0612f483c86ca899b9261 - Patch | |
| References | () https://git.kernel.org/stable/c/a16775828aaed1c54ff4e6fe83e8e4d5c6a50cb7 - Patch | |
| References | () https://git.kernel.org/stable/c/b504518a397059e1d55c521ba0ea2b545a6c4b52 - Patch | |
| References | () https://git.kernel.org/stable/c/d410017a7181cb55e4a5c810b32b75e4416c6808 - Patch | |
| References | () https://git.kernel.org/stable/c/ecf4ddc3aee8ade504c4d36b7b4053ce6093e200 - Patch | |
| References | () https://git.kernel.org/stable/c/f6a392266276730bea893b55d12940e32a25f56a - Patch | |
| References | () https://git.kernel.org/stable/c/faa4364bef2ec0060de381ff028d1d836600a381 - Patch | |
| CWE | CWE-787 | |
| First Time |
Linux
Linux linux Kernel |
|
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.1 |
Information
Published : 2024-06-21 11:15
Updated : 2025-09-17 16:57
NVD link : CVE-2024-38621
Mitre link : CVE-2024-38621
CVE.ORG link : CVE-2024-38621
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-787
Out-of-bounds Write