CVE-2026-46276 (GCVE-0-2026-46276)

Vulnerability from cvelistv5 – Published: 2026-06-08 15:41 – Updated: 2026-06-14 18:05
VLAI
Title
drm/amdgpu: fix zero-size GDS range init on RDNA4
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: fix zero-size GDS range init on RDNA4 RDNA4 (GFX 12) hardware removes the GDS, GWS, and OA on-chip memory resources. The gfx_v12_0 initialisation code correctly leaves adev->gds.gds_size, adev->gds.gws_size, and adev->gds.oa_size at zero to reflect this. amdgpu_ttm_init() unconditionally calls amdgpu_ttm_init_on_chip() for each of these resources regardless of size. When the size is zero, amdgpu_ttm_init_on_chip() forwards the call to ttm_range_man_init(), which calls drm_mm_init(mm, 0, 0). drm_mm_init() immediately fires DRM_MM_BUG_ON(start + size <= start) -- trivially true when size is zero -- crashing the kernel during modprobe of amdgpu on an RX 9070 XT. Guard against this by returning 0 early from amdgpu_ttm_init_on_chip() when size_in_page is zero. This skips TTM resource manager registration for hardware resources that are absent, without affecting any other GPU type. DRM_MM_BUG_ON() only asserts if CONFIG_DRM_DEBUG_MM is enabled in the kernel config. This is apparently rarely enabled as these chips have been in the market for over a year and this issue was only reported now. Oops-Analysis: http://oops.fenrus.org/reports/bugzilla.korg/221376/report.html (cherry picked from commit 5719ce5865279cad4fd5f01011fe037168503f2d)
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c832c346cdf9022872655be621880e0f66f4135d , < 1f5d33e7b0a9a2a140f46e22fb52eede323c5946 (git)
Affected: c832c346cdf9022872655be621880e0f66f4135d , < 9bc925759c05feae7dfa9570e77131d54729c8ea (git)
Affected: c832c346cdf9022872655be621880e0f66f4135d , < 36f9602fb22ede69fcc8b422be0cf8105bf655ad (git)
Affected: c832c346cdf9022872655be621880e0f66f4135d , < be0376affcafa0bbb371bb501579a825eae32281 (git)
Affected: c832c346cdf9022872655be621880e0f66f4135d , < 0e21db1a77967bc15df662efdca8ea8a61d124ea (git)
Affected: c832c346cdf9022872655be621880e0f66f4135d , < 30c000a49094ec568c9b51b7421f7a4a3f0b0298 (git)
Affected: c832c346cdf9022872655be621880e0f66f4135d , < 3e26c76891ab99fa173e9c501119fbb5c9f4600f (git)
Affected: c832c346cdf9022872655be621880e0f66f4135d , < 095a8b0ad3c3b5cdc3850d961adb8a8f735220bb (git)
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Linux Linux Affected: 4.20
Unaffected: 0 , < 4.20 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.86 , ≤ 6.12.* (semver)
Unaffected: 6.18.27 , ≤ 6.18.* (semver)
Unaffected: 7.0.4 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c"
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      "descriptions": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: fix zero-size GDS range init on RDNA4\n\nRDNA4 (GFX 12) hardware removes the GDS, GWS, and OA on-chip memory\nresources. The gfx_v12_0 initialisation code correctly leaves\nadev-\u003egds.gds_size, adev-\u003egds.gws_size, and adev-\u003egds.oa_size at\nzero to reflect this.\n\namdgpu_ttm_init() unconditionally calls amdgpu_ttm_init_on_chip() for\neach of these resources regardless of size. When the size is zero,\namdgpu_ttm_init_on_chip() forwards the call to ttm_range_man_init(),\nwhich calls drm_mm_init(mm, 0, 0). drm_mm_init() immediately fires\nDRM_MM_BUG_ON(start + size \u003c= start) -- trivially true when size is\nzero -- crashing the kernel during modprobe of amdgpu on an RX 9070 XT.\n\nGuard against this by returning 0 early from\namdgpu_ttm_init_on_chip() when size_in_page is zero. This skips TTM\nresource manager registration for hardware resources that are absent,\nwithout affecting any other GPU type.\n\nDRM_MM_BUG_ON() only asserts if CONFIG_DRM_DEBUG_MM is enabled in\nthe kernel config.  This is apparently rarely enabled as these chips\nhave been in the market for over a year and this issue was only reported\nnow.\n\nOops-Analysis: http://oops.fenrus.org/reports/bugzilla.korg/221376/report.html\n(cherry picked from commit 5719ce5865279cad4fd5f01011fe037168503f2d)"
        }
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      "providerMetadata": {
        "dateUpdated": "2026-06-14T18:05:43.582Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/095a8b0ad3c3b5cdc3850d961adb8a8f735220bb"
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      "title": "drm/amdgpu: fix zero-size GDS range init on RDNA4",
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    "assignerShortName": "Linux",
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    "datePublished": "2026-06-08T15:41:18.672Z",
    "dateReserved": "2026-05-13T15:03:33.109Z",
    "dateUpdated": "2026-06-14T18:05:43.582Z",
    "state": "PUBLISHED"
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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.

Sightings

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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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