CVE-2026-43318 (GCVE-0-2026-43318)

Vulnerability from cvelistv5 – Published: 2026-05-08 13:26 – Updated: 2026-05-11 22:22
VLAI
Title
drm/amdgpu: fix sync handling in amdgpu_dma_buf_move_notify
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: fix sync handling in amdgpu_dma_buf_move_notify Invalidating a dmabuf will impact other users of the shared BO. In the scenario where process A moves the BO, it needs to inform process B about the move and process B will need to update its page table. The commit fixes a synchronisation bug caused by the use of the ticket: it made amdgpu_vm_handle_moved behave as if updating the page table immediately was correct but in this case it's not. An example is the following scenario, with 2 GPUs and glxgears running on GPU0 and Xorg running on GPU1, on a system where P2P PCI isn't supported: glxgears: export linear buffer from GPU0 and import using GPU1 submit frame rendering to GPU0 submit tiled->linear blit Xorg: copy of linear buffer The sequence of jobs would be: drm_sched_job_run # GPU0, frame rendering drm_sched_job_queue # GPU0, blit drm_sched_job_done # GPU0, frame rendering drm_sched_job_run # GPU0, blit move linear buffer for GPU1 access # amdgpu_dma_buf_move_notify -> update pt # GPU0 It this point the blit job on GPU0 is still running and would likely produce a page fault.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a448cb003edcb4b63d0a9c95f3faab724e6150fb , < 82a7ea35a1526bef8ae170c33ff80e5db7728961 (git)
Affected: a448cb003edcb4b63d0a9c95f3faab724e6150fb , < 89a9389ad70d3c69538e59d87df67d407aef4c26 (git)
Affected: a448cb003edcb4b63d0a9c95f3faab724e6150fb , < 3307459eb3583115264421e859858d1f90f3694a (git)
Affected: a448cb003edcb4b63d0a9c95f3faab724e6150fb , < b18fc0ab837381c1a6ef28386602cd888f2d9edf (git)
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Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.16 , ≤ 6.18.* (semver)
Unaffected: 6.19.6 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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