CVE-2025-38585 staging: media: atomisp: Fix stack buffer overflow in gmin_get_var_int()
A stack buffer overflow in the Linux kernel atomisp driver allows potential code execution when processing large EFI variables during camera initialization.
- 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-2025-38585?
CVE-2025-38585 is a high-severity memory corruption vulnerability in Linux kernel, published on 19 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:
staging: media: atomisp: Fix stack buffer overflow in gmin_get_var_int()
When gmin_get_config_var() calls efi.get_variable() and the EFI variable is larger than the expected buffer size, two behaviors combine to create a stack buffer overflow:
1. gmin_get_config_var() does not return the proper error code when efi.get_variable() fails. It returns the stale 'ret' value from earlier operations instead of indicating the EFI failure.
2. When efi.get_variable() returns EFI_BUFFER_TOO_SMALL, it updates *out_len to the required buffer size but writes no data to the output buffer. However, due to bug #1, gmin_get_var_int() believes the call succeeded.
The caller gmin_get_var_int() then performs: - Allocates val[CFG_VAR_NAME_MAX + 1] (65 bytes) on stack - Calls gmin_get_config_var(dev, is_gmin, var, val, &len) with len=64 - If EFI variable is >64 bytes, efi.get_variable() sets len=required_size - Due to bug #1, thinks call succeeded with len=required_size - Executes val[len] = 0, writing past end of 65-byte stack buffer
This creates a stack buffer overflow when EFI variables are larger than 64 bytes. Since EFI variables can be controlled by firmware or system configuration, this could potentially be exploited for code execution.
Fix the bug by returning proper error codes from gmin_get_config_var() based on EFI status instead of stale 'ret' value.
The gmin_get_var_int() function is called during device initialization for camera sensor configuration on Intel Bay Trail and Cherry Trail platforms using the atomisp camera stack.
Weakness: CWE-787
Which versions are affected by CVE-2025-38585?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-38585?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-38585 being exploited?
There is no known exploitation of CVE-2025-38585 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-66464, BELL-CVE-2025-38585, DEBIAN-CVE-2025-38585, GHSA-44rm-frxc-c6v7, ROOT-OS-DEBIAN-12-CVE-2025-38585, ROOT-OS-DEBIAN-13-CVE-2025-38585 and 2 more.