staging: media: atomisp: Fix stack buffer overflow in gmin_get_var_int()

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Summary

CVECVE-2025-38585
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-08-19 17:15:35 UTC
Updated2026-06-15 10:16:27 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

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

Problem Types: CWE-787

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a49d25364dfb9f8a64037488a39ab1f56c5fa419 51b8dc5163d2ff2bf04019f8bf7e3bd0e75bb654 git Not specified
CNA Linux Linux affected ad85094b293e40e7a2f831b0311a389d952ebd5e 3d672fe065aa00f4d66f42e3c9720f69a3ed43e7 git Not specified
CNA Linux Linux affected ad85094b293e40e7a2f831b0311a389d952ebd5e e6d3453a002e89537e6136f6c774659b297a549b git Not specified
CNA Linux Linux affected ad85094b293e40e7a2f831b0311a389d952ebd5e 1a7a2f59fb2eb0718a0cff1e5822500cefe50ed9 git Not specified
CNA Linux Linux affected ad85094b293e40e7a2f831b0311a389d952ebd5e ee4cf798202d285dcbe85e4467a094c44f5ed8e6 git Not specified
CNA Linux Linux affected 4.12 Not specified
CNA Linux Linux affected 5.8 Not specified
CNA Linux Linux unaffected 4.12 semver Not specified
CNA Linux Linux unaffected 4.18 5.8 semver Not specified
CNA Linux Linux unaffected 6.12.42 6.12.* semver Not specified
CNA Linux Linux unaffected 6.15.10 6.15.* semver Not specified
CNA Linux Linux unaffected 6.16.1 6.16.* semver Not specified
CNA Linux Linux unaffected 6.17 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1a7a2f59fb2eb0718a0cff1e5822500cefe50ed9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3d672fe065aa00f4d66f42e3c9720f69a3ed43e7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/51b8dc5163d2ff2bf04019f8bf7e3bd0e75bb654 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ee4cf798202d285dcbe85e4467a094c44f5ed8e6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e6d3453a002e89537e6136f6c774659b297a549b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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