CVE-2025-38585

/// Technical 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

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References