CVE-2026-43169 (GCVE-0-2026-43169)
Vulnerability from cvelistv5
Published
2026-05-06 11:27
Modified
2026-05-11 22:19
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/buddy: Prevent BUG_ON by validating rounded allocation When DRM_BUDDY_CONTIGUOUS_ALLOCATION is set, the requested size is rounded up to the next power-of-two via roundup_pow_of_two(). Similarly, for non-contiguous allocations with large min_block_size, the size is aligned up via round_up(). Both operations can produce a rounded size that exceeds mm->size, which later triggers BUG_ON(order > mm->max_order). Example scenarios: - 9G CONTIGUOUS allocation on 10G VRAM memory: roundup_pow_of_two(9G) = 16G > 10G - 9G allocation with 8G min_block_size on 10G VRAM memory: round_up(9G, 8G) = 16G > 10G Fix this by checking the rounded size against mm->size. For non-contiguous or range allocations where size > mm->size is invalid, return -EINVAL immediately. For contiguous allocations without range restrictions, allow the request to fall through to the existing __alloc_contig_try_harder() fallback. This ensures invalid user input returns an error or uses the fallback path instead of hitting BUG_ON. v2: (Matt A) - Add Fixes, Cc stable, and Closes tags for context
References
Impacted products
Vendor Product Version
Linux Linux Version: 0a1844bf0b532d84324453374ad6845f64066c28
Version: 0a1844bf0b532d84324453374ad6845f64066c28
Version: 0a1844bf0b532d84324453374ad6845f64066c28
Version: 0a1844bf0b532d84324453374ad6845f64066c28
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/drm_buddy.c"
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/buddy: Prevent BUG_ON by validating rounded allocation\n\nWhen DRM_BUDDY_CONTIGUOUS_ALLOCATION is set, the requested size is\nrounded up to the next power-of-two via roundup_pow_of_two().\nSimilarly, for non-contiguous allocations with large min_block_size,\nthe size is aligned up via round_up(). Both operations can produce a\nrounded size that exceeds mm-\u003esize, which later triggers\nBUG_ON(order \u003e mm-\u003emax_order).\n\nExample scenarios:\n- 9G CONTIGUOUS allocation on 10G VRAM memory:\n  roundup_pow_of_two(9G) = 16G \u003e 10G\n- 9G allocation with 8G min_block_size on 10G VRAM memory:\n  round_up(9G, 8G) = 16G \u003e 10G\n\nFix this by checking the rounded size against mm-\u003esize. For\nnon-contiguous or range allocations where size \u003e mm-\u003esize is invalid,\nreturn -EINVAL immediately. For contiguous allocations without range\nrestrictions, allow the request to fall through to the existing\n__alloc_contig_try_harder() fallback.\n\nThis ensures invalid user input returns an error or uses the fallback\npath instead of hitting BUG_ON.\n\nv2: (Matt A)\n- Add Fixes, Cc stable, and Closes tags for context"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:19:07.323Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d764b8dd420098a4d253b8a5b27568c897edb2cf"
        },
        {
          "url": "https://git.kernel.org/stable/c/6236c1cd9fdf433d39ed28b2491ccdfe7ae95061"
        },
        {
          "url": "https://git.kernel.org/stable/c/ecb32c60d8cbed2ee9ce9f343b6aa2f32babc727"
        },
        {
          "url": "https://git.kernel.org/stable/c/5488a29596cdba93a60a79398dc9b69d5bdadf92"
        }
      ],
      "title": "drm/buddy: Prevent BUG_ON by validating rounded allocation",
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43169",
    "datePublished": "2026-05-06T11:27:45.356Z",
    "dateReserved": "2026-05-01T14:12:55.990Z",
    "dateUpdated": "2026-05-11T22:19:07.323Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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