CVE-2026-63879 (GCVE-0-2026-63879)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:54 – Updated: 2026-08-05 12:36
VLAI
Title
drm/amdgpu: fix amdgpu_hmm_range_get_pages
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: fix amdgpu_hmm_range_get_pages The notifier sequence must only be read once or otherwise we could work with invalid pages. While at it also fix the coding style, e.g. drop the pre-initialized return value and use the common define for 2G range. (cherry picked from commit c08972f555945cda57b0adb72272a37910153390)
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c1420a5dd4dd2a1ffc86965ad1c6f439afb130bc , < 2fd24407457a6b181ba827705678da70e528dcd0 (git)
Affected: c1420a5dd4dd2a1ffc86965ad1c6f439afb130bc , < 962d684b5dc0741dcd93485d41b450de402d5592 (git)
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Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 7.0.12 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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      "affected": [
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          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c"
          ],
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      ],
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                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: fix amdgpu_hmm_range_get_pages\n\nThe notifier sequence must only be read once or otherwise we could work\nwith invalid pages.\n\nWhile at it also fix the coding style, e.g. drop the pre-initialized\nreturn value and use the common define for 2G range.\n\n(cherry picked from commit c08972f555945cda57b0adb72272a37910153390)"
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      "metrics": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached only through local AMDGPU DRM ioctls (e.g., AMDGPU_GEM_USERPTR, AMDGPU_CS) and KFD ioctls on /dev/kfd that call amdgpu_hmm_range_get_pages(); there is no network-facing entry point.\nAC:L - Exploitation requires a \u003e2GB userptr/SVM mapping and a concurrent munmap/remap during the multi-chunk HMM walk, but the attacker controls both the ioctl thread and the address-space manipulation, so the race is attacker-driven rather than dependent on uncontrollable conditions.\nPR:L - Any unprivileged local user with access to the AMDGPU render node or /dev/kfd (typically render/video group membership) can create large userptr buffers and submit GPU work that triggers the vulnerable HMM path; root or init-namespace capabilities are not required.\nUI:N - Exploitation is fully attacker-driven through GPU memory registration and command submission ioctls and does not require any action from another user or administrator.\nS:U - The flaw corrupts or misuses kernel-tracked page metadata and enables standard local kernel memory safety impact and privilege escalation within the same kernel security domain, not a VM escape or IOMMU boundary bypass.\nC:H - Re-reading the MMU notifier sequence per 2GB chunk lets later validation pass while earlier PFNs may reference unmapped or freed pages, giving the GPU (and kernel DMA helpers) a stale-page/use-after-free primitive that can disclose arbitrary physical memory contents.\nI:H - Stale PFNs from invalidated mappings can be DMA-mapped and written by GPU operations, enabling arbitrary memory corruption and potential control-flow hijacking via repurposed physical pages rather than a bounded or crash-only effect.\nA:H - Operating on invalid struct page pointers during pinning/DMA mapping can trigger kernel oopses or panics, and the underlying use-after-free class of bug inherently threatens system availability even when full exploitation is not attempted."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:36:49.976Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/2fd24407457a6b181ba827705678da70e528dcd0"
        },
        {
          "url": "https://git.kernel.org/stable/c/962d684b5dc0741dcd93485d41b450de402d5592"
        }
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      "title": "drm/amdgpu: fix amdgpu_hmm_range_get_pages",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63879",
    "datePublished": "2026-07-19T14:54:51.698Z",
    "dateReserved": "2026-07-19T07:54:57.018Z",
    "dateUpdated": "2026-08-05T12:36:49.976Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-09-02",
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      "percentile": "0.06768"
    },
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      "cve": "CVE-2026-63879",
      "id": "msrc_CVE-2026-63879",
      "initial_release_date": "2026-07-21T01:03:54.000Z",
      "product_status:known_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "drm/amdgpu: fix amdgpu_hmm_range_get_pages",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-63879.json",
      "version": "2"
    },
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      "current_release_date": "2026-08-20T08:01:00+00:00",
      "cve": "CVE-2026-63879",
      "id": "CVE-2026-63879",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:fixed": "762",
      "product_status:known_affected": "50",
      "product_status:under_investigation": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/amdgpu: fix amdgpu_hmm_range_get_pages",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63879.json",
      "version": "3"
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    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-07-27T17:02:47Z",
      "cve": "CVE-2026-63879",
      "id": "CVE-2026-63879",
      "initial_release_date": "2026-07-21T13:04:22Z",
      "product_status:known_affected": "131",
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      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-63879",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63879.json",
      "version": "3"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.