Linux Kernel up to 6.18.52/7.3-rc1 pagemap drm_pagemap.c drm_pagemap_migrate_unmap_pages use after free

Summaryinfo

A vulnerability, which was classified as very critical, was found in Linux Kernel up to 6.18.52/7.3-rc1. This affects the function drm_pagemap_migrate_unmap_pages of the file drivers/gpu/drm/drm_pagemap.c of the component pagemap. The manipulation results in use after free. This vulnerability was named CVE-2026-93284. The attack may be performed from remote. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.18.52/7.3-rc1. It has been classified as very critical. Affected is the function drm_pagemap_migrate_unmap_pages of the file drivers/gpu/drm/drm_pagemap.c of the component pagemap. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: drm/pagemap: dma-unmap pages before handling migration errors drm_pagemap_migrate_unmap_pages() relies on the pages array to determine which pages require DMA unmapping. However, drm_pagemap_migration_unlock_put_pages() clears the array as part of its cleanup, leaving drm_pagemap_migrate_unmap_pages() with no valid page information if it is called afterward. Call drm_pagemap_migrate_unmap_pages() before drm_pagemap_migration_unlock_put_pages() so the pages array remains valid during DMA unmapping.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2026-93284 since 09/17/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 09/24/2026).

Upgrading to version 6.18.53 or 7.3-rc2 eliminates this vulnerability. Applying the patch e4331c6644db85bc6ceb470bd84bcf371b6dbfa6/9e6372ec2a3990662ae0a67f56ac0aee19848d5b is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.18.0
• 6.18.1
• 6.18.2
• 6.18.3
• 6.18.4
• 6.18.5
• 6.18.6
• 6.18.7
• 6.18.8
• 6.18.9
• 6.18.10
• 6.18.11
• 6.18.12
• 6.18.13
• 6.18.14
• 6.18.15
• 6.18.16
• 6.18.17
• 6.18.18
• 6.18.19
• 6.18.20
• 6.18.21
• 6.18.22
• 6.18.23
• 6.18.24
• 6.18.25
• 6.18.26
• 6.18.27
• 6.18.28
• 6.18.29
• 6.18.30
• 6.18.31
• 6.18.32
• 6.18.33
• 6.18.34
• 6.18.35
• 6.18.36
• 6.18.37
• 6.18.38
• 6.18.39
• 6.18.40
• 6.18.41
• 6.18.42
• 6.18.43
• 6.18.44
• 6.18.45
• 6.18.46
• 6.18.47
• 6.18.48
• 6.18.49
• 6.18.50
• 6.18.51
• 6.18.52
• 7.3-rc1

License

• open-source

Website

• Vendor: https://www.kernel.org/

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