TTM Memory Management Infinite LRU Walk in Linux Kernel

Publication date: 2026-06-24

Last updated on: 2026-07-14

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: drm/ttm: Fix ttm_bo_shrink() infinite LRU walk on backup failure Apply the same fix as b2ed01e7ad ("drm/ttm: Fix ttm_bo_swapout() infinite LRU walk on swapout failure") to the ttm_bo_shrink() path. Move del_bulk_move from before the backup to after success only, using ttm_resource_del_bulk_move_unevictable() since the resource is now unevictable once fully backed up.

CVSS Scores

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Meta Information

Published

2026-06-24

Last Modified

2026-07-14

Generated

2026-07-15

AI Q&A

2026-06-24

EPSS Evaluated

2026-07-13

NVD

CVE-2026-52949

EUVD

EUVD-2026-38817

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	From 6.15 (inc) to 7.0.10 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability is related to the Linux kernel's Direct Rendering Manager (DRM) subsystem, specifically the ttm (Translation Table Maps) memory management component. The issue involves the function ttm_bo_shrink(), which could enter an infinite Least Recently Used (LRU) walk when a backup operation fails. The fix applies changes similar to a previous patch that addressed a similar infinite LRU walk problem in the ttm_bo_swapout() function. The fix ensures that certain resource management steps occur only after a successful backup, preventing the resource from becoming unevictable prematurely and avoiding the infinite loop.

Impact Analysis

If exploited or triggered, this vulnerability could cause the Linux kernel's memory management subsystem to enter an infinite loop during resource cleanup or memory shrinking operations. This could lead to system performance degradation, resource exhaustion, or potentially a denial of service due to the kernel being stuck in the infinite LRU walk.

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