CVE-2026-99090 (GCVE-0-2026-99090)

Vulnerability from cvelistv5 – Published: 2026-10-26 14:51 – Updated: 2026-10-27 15:53
VLAI
Title
drm/amdgpu: serialize vblank counter reads against GPU reset
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: serialize vblank counter reads against GPU reset The vblank counter callback reads display registers and scanout position without holding reset_domain->sem. During GPU recovery, display commit work can call the callback while reset owns the semaphore for writing. The hardware access then triggers the lockdep_assert_held() in amdgpu_device_skip_hw_access() and sets TAINT_WARN when lockdep is enabled. Try to acquire the reset semaphore for reading before accessing the hardware, and hold it across the counter and scanout-position reads. If reset is already in progress, return DRM's cached software vblank count instead. This avoids blocking behind reset and avoids accessing display hardware while it is being reset. The cached count is less accurate than the hardware count, but is used only when reset prevents a safe hardware read. This addresses the reset-time warning from this vblank path; it does not suppress or fix unrelated lockdep warnings. (cherry picked from commit 51a4359f7431a4be5e42803c8bdaf7e0e5be2934)
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6649 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d38ceaf99ed015f2a0b9af3499791bd3a3daae21 , < 037796d9ca1da97978deaefd88ca5649f6cb69f5 (git)
Affected: d38ceaf99ed015f2a0b9af3499791bd3a3daae21 , < 11b6193c8841a052b7907006ffb1e02468b1448e (git)
Affected: d38ceaf99ed015f2a0b9af3499791bd3a3daae21 , < 8d6f773d7479034a574ecc3b585bcd07d46b4824 (git)
Affected: d38ceaf99ed015f2a0b9af3499791bd3a3daae21 , < f4a0a1ce147d1a6e428d7cb5e3b99fd695139fc7 (git)
Affected: d38ceaf99ed015f2a0b9af3499791bd3a3daae21 , < 1a6023edfbb5673f55fab6348f135fb3b1428ea5 (git)
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Linux Linux Affected: 4.2
Unaffected: 0 , < 4.2 (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.113 , ≤ 6.12.* (semver)
Unaffected: 6.18.57 , ≤ 6.18.* (semver)
Unaffected: 7.2.11 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: serialize vblank counter reads against GPU reset\n\nThe vblank counter callback reads display registers and scanout\nposition without holding reset_domain-\u003esem. During GPU recovery,\ndisplay commit work can call the callback while reset owns the\nsemaphore for writing. The hardware access then triggers the\nlockdep_assert_held() in amdgpu_device_skip_hw_access() and sets\nTAINT_WARN when lockdep is enabled.\n\nTry to acquire the reset semaphore for reading before accessing the\nhardware, and hold it across the counter and scanout-position reads.\nIf reset is already in progress, return DRM\u0027s cached software vblank\ncount instead. This avoids blocking behind reset and avoids accessing\ndisplay hardware while it is being reset.\n\nThe cached count is less accurate than the hardware count, but is\nused only when reset prevents a safe hardware read. This addresses\nthe reset-time warning from this vblank path; it does not suppress or\nfix unrelated lockdep warnings.\n\n(cherry picked from commit 51a4359f7431a4be5e42803c8bdaf7e0e5be2934)"
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    "datePublished": "2026-10-26T14:51:59.654Z",
    "dateReserved": "2026-09-25T10:25:14.390Z",
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      "cve": "CVE-2026-99090",
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}



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