Linux Kernel up to 6.1.41/6.4.6 ttm_lru_bulk_move_del null pointer dereference

Summaryinfo

A vulnerability has been found in Linux Kernel up to 6.1.41/6.4.6 and classified as critical. This vulnerability affects the function ttm_lru_bulk_move_del. This manipulation causes null pointer dereference. This vulnerability appears as CVE-2023-53444. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.1.41/6.4.6. It has been declared as critical. Affected by this vulnerability is the function ttm_lru_bulk_move_del. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: drm/ttm: fix bulk_move corruption when adding a entry When the resource is the first in the bulk_move range, adding it again (thus moving it to the tail) will corrupt the list since the first pointer is not moved. This eventually lead to null pointer deref in ttm_lru_bulk_move_del()

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2023-53444 since 09/17/2025. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 265497 (Linux Distros Unpatched Vulnerability : CVE-2023-53444), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.42 or 6.4.7 eliminates this vulnerability. Applying the patch 70a3015683b007a0db4a1e858791b69afd45fc83/e7cf50e41bdc2d574056ebbfeaafc5f0e2562d5b/4481913607e58196c48a4fef5e6f45350684ec3c is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (265497) and CERT Bund (WID-SEC-2025-2092). Be aware that VulDB is the high quality source for vulnerability data.

Affected

• Amazon Linux 2
• Red Hat Enterprise Linux
• SUSE Linux
• Oracle Linux
• SUSE openSUSE
• RESF Rocky Linux
• Open Source Linux Kernel
• Dell Secure Connect Gateway
• IBM QRadar SIEM

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.1.0
• 6.1.1
• 6.1.2
• 6.1.3
• 6.1.4
• 6.1.5
• 6.1.6
• 6.1.7
• 6.1.8
• 6.1.9
• 6.1.10
• 6.1.11
• 6.1.12
• 6.1.13
• 6.1.14
• 6.1.15
• 6.1.16
• 6.1.17
• 6.1.18
• 6.1.19
• 6.1.20
• 6.1.21
• 6.1.22
• 6.1.23
• 6.1.24
• 6.1.25
• 6.1.26
• 6.1.27
• 6.1.28
• 6.1.29
• 6.1.30
• 6.1.31
• 6.1.32
• 6.1.33
• 6.1.34
• 6.1.35
• 6.1.36
• 6.1.37
• 6.1.38
• 6.1.39
• 6.1.40
• 6.1.41
• 6.4.0
• 6.4.1
• 6.4.2
• 6.4.3
• 6.4.4
• 6.4.5
• 6.4.6

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

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