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Echo: linux: security update to 6.1.159-1

medium Tenable Cloud Security Plugin ID 457363

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: Fix NULL pointer
 dereference in VRAM logic for APU devices Previously, APU platforms (and other scenarios with
 uninitialized VRAM managers) triggered a NULL pointer dereference in `ttm_resource_manager_usage()`. The
 root cause is not that the `struct ttm_resource_manager *man` pointer itself is NULL, but that `man->bdev`
 (the backing device pointer within the manager) remains uninitialized (NULL) on APUs—since APUs lack
 dedicated VRAM and do not fully set up VRAM manager structures. When `ttm_resource_manager_usage()`
 attempts to acquire `man->bdev->lru_lock`, it dereferences the NULL `man->bdev`, leading to a kernel OOPS.
 1. **amdgpu_cs.c**: Extend the existing bandwidth control check in `amdgpu_cs_get_threshold_for_moves()`
 to include a check for `ttm_resource_manager_used()`. If the manager is not used (uninitialized `bdev`),
 return 0 for migration thresholds immediately—skipping VRAM-specific logic that would trigger the NULL
 dereference. 2. **amdgpu_kms.c**: Update the `AMDGPU_INFO_VRAM_USAGE` ioctl and memory info reporting to
 use a conditional: if the manager is used, return the real VRAM usage; otherwise, return 0. This avoids
 accessing `man->bdev` when it is NULL. 3. **amdgpu_virt.c**: Modify the vf2pf (virtual function to
 physical function) data write path. Use `ttm_resource_manager_used()` to check validity: if the manager is
 usable, calculate `fb_usage` from VRAM usage; otherwise, set `fb_usage` to 0 (APUs have no discrete
 framebuffer to report). This approach is more robust than APU-specific checks because it: - Works for all
 scenarios where the VRAM manager is uninitialized (not just APUs), - Aligns with TTM's design by using its
 native helper function, - Preserves correct behavior for discrete GPUs (which have fully initialized
 `man->bdev` and pass the `ttm_resource_manager_used()` check). v4: use
 ttm_resource_manager_used(&adev->mman.vram_mgr.manager) instead of checking the adev->gmc.is_app_apu flag
 (Christian) (CVE-2025-40288)

Solution

Update the linux library and its related packages to version 6.1.159-1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2025-40288

Plugin Details

Severity: Medium

ID: 457363

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.42

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

Vector: CVSS2#AV:L/AC:L/Au:S/C:N/I:N/A:C

CVSS Score Source: CVE-2025-40288

CVSS v3

Risk Factor: Medium

Base Score: 4.7

Temporal Score: 4.1

Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 12/7/2025

Vulnerability Publication Date: 12/6/2025

Reference Information

CVE: CVE-2025-40288