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GHSA-54R4-5MX4-49PG

Vulnerability from github – Published: 2026-10-28 12:31 – Updated: 2026-10-28 12:31

Details

In the Linux kernel, the following vulnerability has been resolved:

drm/amdgpu: free the userptr ranges when a CS fails after parser_bos

amdgpu_cs_parser_bos() allocates an HMM range for every userptr entry of the BO list and looks up the user pages. Those ranges are only freed when amdgpu_cs_parser_bos() itself fails or when amdgpu_cs_submit() checks them under the notifier lock. If amdgpu_cs_patch_jobs(), amdgpu_cs_vm_handling(), amdgpu_cs_sync_rings() or the early part of amdgpu_cs_submit() fails, nothing frees them: neither amdgpu_cs_parser_fini() nor amdgpu_bo_list_free() touch e->range.

Each such CS then leaks the range, its hmm_pfns array (8 bytes per page of the userptr BO) and the BO reference the range holds. An IB on a ring that patches the CS in place (e.g. VCN) with an unmapped va_start fails in amdgpu_cs_patch_ibs() and takes this path.

Free the ranges on those error paths. Ranges amdgpu_cs_submit() already dropped are NULL, so freeing them again is a no-op.

(cherry picked from commit c52a9542ed7cfd527feb938bd0accada2ac8d267)

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{
  "affected": [],
  "aliases": [
    "CVE-2026-99106"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-28T11:17:29Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: free the userptr ranges when a CS fails after parser_bos\n\namdgpu_cs_parser_bos() allocates an HMM range for every userptr entry of\nthe BO list and looks up the user pages. Those ranges are only freed when\namdgpu_cs_parser_bos() itself fails or when amdgpu_cs_submit() checks\nthem under the notifier lock. If amdgpu_cs_patch_jobs(),\namdgpu_cs_vm_handling(), amdgpu_cs_sync_rings() or the early part of\namdgpu_cs_submit() fails, nothing frees them: neither\namdgpu_cs_parser_fini() nor amdgpu_bo_list_free() touch e-\u003erange.\n\nEach such CS then leaks the range, its hmm_pfns array (8 bytes per page\nof the userptr BO) and the BO reference the range holds. An IB on a ring\nthat patches the CS in place (e.g. VCN) with an unmapped va_start fails\nin amdgpu_cs_patch_ibs() and takes this path.\n\nFree the ranges on those error paths. Ranges amdgpu_cs_submit() already\ndropped are NULL, so freeing them again is a no-op.\n\n(cherry picked from commit c52a9542ed7cfd527feb938bd0accada2ac8d267)",
  "id": "GHSA-54r4-5mx4-49pg",
  "modified": "2026-10-28T12:31:02Z",
  "published": "2026-10-28T12:31:02Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99106"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1b4da805a0ba354a549ce07459c871c17dd94fe0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2d9d24385201f476a2f754495b71bbac5ba6ea7b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6ac46ae5ac561d4fc7d4246ad83d71bed0d9af9a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-99106 (GCVE-0-2026-99106)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:34 – Updated: 2026-10-28 10:34

Title

drm/amdgpu: free the userptr ranges when a CS fails after parser_bos

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: free the userptr ranges when a CS fails after parser_bos amdgpu_cs_parser_bos() allocates an HMM range for every userptr entry of the BO list and looks up the user pages. Those ranges are only freed when amdgpu_cs_parser_bos() itself fails or when amdgpu_cs_submit() checks them under the notifier lock. If amdgpu_cs_patch_jobs(), amdgpu_cs_vm_handling(), amdgpu_cs_sync_rings() or the early part of amdgpu_cs_submit() fails, nothing frees them: neither amdgpu_cs_parser_fini() nor amdgpu_bo_list_free() touch e->range. Each such CS then leaks the range, its hmm_pfns array (8 bytes per page of the userptr BO) and the BO reference the range holds. An IB on a ring that patches the CS in place (e.g. VCN) with an unmapped va_start fails in amdgpu_cs_patch_ibs() and takes this path. Free the ranges on those error paths. Ranges amdgpu_cs_submit() already dropped are NULL, so freeing them again is a no-op. (cherry picked from commit c52a9542ed7cfd527feb938bd0accada2ac8d267)

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7033 records in the last 180 days details

References

3 references

URL	Tags
https://git.kernel.org/stable/c/6ac46ae5ac561d4fc…
https://git.kernel.org/stable/c/2d9d24385201f476a…
https://git.kernel.org/stable/c/1b4da805a0ba354a5…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: fec8fdb54e8f74d88951c9f998f47bf4f2031fe0 , < 6ac46ae5ac561d4fc7d4246ad83d71bed0d9af9a (git) Affected: fec8fdb54e8f74d88951c9f998f47bf4f2031fe0 , < 2d9d24385201f476a2f754495b71bbac5ba6ea7b (git) Affected: fec8fdb54e8f74d88951c9f998f47bf4f2031fe0 , < 1b4da805a0ba354a549ce07459c871c17dd94fe0 (git)
Linux	Linux	Affected: 6.2 Unaffected: 0 , < 6.2 (semver) Unaffected: 6.18.59 , ≤ 6.18.* (semver) Unaffected: 7.2.13 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

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{
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          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c"
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          "vendor": "Linux",
          "versions": [
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            {
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              "version": "6.18.59",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: free the userptr ranges when a CS fails after parser_bos\n\namdgpu_cs_parser_bos() allocates an HMM range for every userptr entry of\nthe BO list and looks up the user pages. Those ranges are only freed when\namdgpu_cs_parser_bos() itself fails or when amdgpu_cs_submit() checks\nthem under the notifier lock. If amdgpu_cs_patch_jobs(),\namdgpu_cs_vm_handling(), amdgpu_cs_sync_rings() or the early part of\namdgpu_cs_submit() fails, nothing frees them: neither\namdgpu_cs_parser_fini() nor amdgpu_bo_list_free() touch e-\u003erange.\n\nEach such CS then leaks the range, its hmm_pfns array (8 bytes per page\nof the userptr BO) and the BO reference the range holds. An IB on a ring\nthat patches the CS in place (e.g. VCN) with an unmapped va_start fails\nin amdgpu_cs_patch_ibs() and takes this path.\n\nFree the ranges on those error paths. Ranges amdgpu_cs_submit() already\ndropped are NULL, so freeing them again is a no-op.\n\n(cherry picked from commit c52a9542ed7cfd527feb938bd0accada2ac8d267)"
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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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