Vulnerability-Lookup

GHSA-M498-64HG-9W93

Vulnerability from github – Published: 2026-08-15 15:30 – Updated: 2026-08-19 18:32

Details

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

drm/vmwgfx: validate DRAW_PRIMITIVES header size before division

vmw_cmd_draw() computes

maxnum = (header->size - sizeof(cmd->body)) / sizeof(*decl);

where header->size is u32 and is taken straight from the user-supplied command stream. When header->size is less than sizeof(cmd->body) the unsigned subtraction wraps to nearly 4 GiB, producing a huge maxnum. Any user-controlled cmd->body.numVertexDecls then passes the bound and the loop dereferences decl[i] far past the end of the kernel command bounce buffer, producing an out-of-bounds read of kernel memory.

Reject undersized headers up front.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74444"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T13:17:48Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vmwgfx: validate DRAW_PRIMITIVES header size before division\n\nvmw_cmd_draw() computes\n\n\tmaxnum = (header-\u003esize - sizeof(cmd-\u003ebody)) / sizeof(*decl);\n\nwhere header-\u003esize is u32 and is taken straight from the user-supplied\ncommand stream.  When header-\u003esize is less than sizeof(cmd-\u003ebody) the\nunsigned subtraction wraps to nearly 4 GiB, producing a huge maxnum.\nAny user-controlled cmd-\u003ebody.numVertexDecls then passes the bound and\nthe loop dereferences decl[i] far past the end of the kernel command\nbounce buffer, producing an out-of-bounds read of kernel memory.\n\nReject undersized headers up front.",
  "id": "GHSA-m498-64hg-9w93",
  "modified": "2026-08-19T18:32:27Z",
  "published": "2026-08-15T15:30:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74444"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/112c6ff29a56f3a22db4d5af869697aa07035ad6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2666cddf0dd218aa9bd1f99db688d1b532eac21a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/85891d174707d8bddcec7a888fb4e1d17def34f3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b89ca4bba820f79dde52af15ee139fe6e8bbc314"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bef30317fcb4c838a37bceb2fc76256eb6b975c1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c77cf8edae2bd3a1599115301cc7c98d0c78e731"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dc0be7662b7b0ce28cb5eea864737793ed7b9e70"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fc0c02f510e41650df3479f96e257acf87d8a20a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74444 (GCVE-0-2026-74444)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:26 – Updated: 2026-08-19 16:36

Title

drm/vmwgfx: validate DRAW_PRIMITIVES header size before division

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/vmwgfx: validate DRAW_PRIMITIVES header size before division vmw_cmd_draw() computes maxnum = (header->size - sizeof(cmd->body)) / sizeof(*decl); where header->size is u32 and is taken straight from the user-supplied command stream. When header->size is less than sizeof(cmd->body) the unsigned subtraction wraps to nearly 4 GiB, producing a huge maxnum. Any user-controlled cmd->body.numVertexDecls then passes the bound and the loop dereferences decl[i] far past the end of the kernel command bounce buffer, producing an out-of-bounds read of kernel memory. Reject undersized headers up front.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/b89ca4bba820f79dd…
https://git.kernel.org/stable/c/bef30317fcb4c838a…
https://git.kernel.org/stable/c/112c6ff29a56f3a22…
https://git.kernel.org/stable/c/2666cddf0dd218aa9…
https://git.kernel.org/stable/c/fc0c02f510e41650d…
https://git.kernel.org/stable/c/dc0be7662b7b0ce28…
https://git.kernel.org/stable/c/c77cf8edae2bd3a15…
https://git.kernel.org/stable/c/85891d174707d8bdd…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 7a73ba7469cbea631050094fd14f73acebb97cf9 , < b89ca4bba820f79dde52af15ee139fe6e8bbc314 (git) Affected: 7a73ba7469cbea631050094fd14f73acebb97cf9 , < bef30317fcb4c838a37bceb2fc76256eb6b975c1 (git) Affected: 7a73ba7469cbea631050094fd14f73acebb97cf9 , < 112c6ff29a56f3a22db4d5af869697aa07035ad6 (git) Affected: 7a73ba7469cbea631050094fd14f73acebb97cf9 , < 2666cddf0dd218aa9bd1f99db688d1b532eac21a (git) Affected: 7a73ba7469cbea631050094fd14f73acebb97cf9 , < fc0c02f510e41650df3479f96e257acf87d8a20a (git) Affected: 7a73ba7469cbea631050094fd14f73acebb97cf9 , < dc0be7662b7b0ce28cb5eea864737793ed7b9e70 (git) Affected: 7a73ba7469cbea631050094fd14f73acebb97cf9 , < c77cf8edae2bd3a1599115301cc7c98d0c78e731 (git) Affected: 7a73ba7469cbea631050094fd14f73acebb97cf9 , < 85891d174707d8bddcec7a888fb4e1d17def34f3 (git)
Linux	Linux	Affected: 2.6.33 Unaffected: 0 , < 2.6.33 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.151 , ≤ 6.6.* (semver) Unaffected: 6.12.103 , ≤ 6.12.* (semver) Unaffected: 6.18.44 , ≤ 6.18.* (semver) Unaffected: 7.1.8 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b89ca4bba820f79dde52af15ee139fe6e8bbc314",
              "status": "affected",
              "version": "7a73ba7469cbea631050094fd14f73acebb97cf9",
              "versionType": "git"
            },
            {
              "lessThan": "bef30317fcb4c838a37bceb2fc76256eb6b975c1",
              "status": "affected",
              "version": "7a73ba7469cbea631050094fd14f73acebb97cf9",
              "versionType": "git"
            },
            {
              "lessThan": "112c6ff29a56f3a22db4d5af869697aa07035ad6",
              "status": "affected",
              "version": "7a73ba7469cbea631050094fd14f73acebb97cf9",
              "versionType": "git"
            },
            {
              "lessThan": "2666cddf0dd218aa9bd1f99db688d1b532eac21a",
              "status": "affected",
              "version": "7a73ba7469cbea631050094fd14f73acebb97cf9",
              "versionType": "git"
            },
            {
              "lessThan": "fc0c02f510e41650df3479f96e257acf87d8a20a",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "dc0be7662b7b0ce28cb5eea864737793ed7b9e70",
              "status": "affected",
              "version": "7a73ba7469cbea631050094fd14f73acebb97cf9",
              "versionType": "git"
            },
            {
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              "versionType": "git"
            },
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.33"
            },
            {
              "lessThan": "2.6.33",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.151",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
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                  "vulnerable": true
                },
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
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                {
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                  "versionStartIncluding": "2.6.33",
                  "vulnerable": true
                }
              ],
              "negate": false,
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vmwgfx: validate DRAW_PRIMITIVES header size before division\n\nvmw_cmd_draw() computes\n\n\tmaxnum = (header-\u003esize - sizeof(cmd-\u003ebody)) / sizeof(*decl);\n\nwhere header-\u003esize is u32 and is taken straight from the user-supplied\ncommand stream.  When header-\u003esize is less than sizeof(cmd-\u003ebody) the\nunsigned subtraction wraps to nearly 4 GiB, producing a huge maxnum.\nAny user-controlled cmd-\u003ebody.numVertexDecls then passes the bound and\nthe loop dereferences decl[i] far past the end of the kernel command\nbounce buffer, producing an out-of-bounds read of kernel memory.\n\nReject undersized headers up front."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "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 the local DRM_IOCTL_VMW_EXECBUF ioctl (vmw_execbuf_ioctl -\u003e vmw_execbuf_process -\u003e vmw_cmd_check_all -\u003e vmw_cmd_draw); it is not reachable from network, adjacent wireless, or physical buses.\nAC:L - An attacker fully controls the user command stream and can set header-\u003esize below sizeof(cmd-\u003ebody) to underflow maxnum and bypass numVertexDecls bounds; no races or victim-dependent timing are required.\nPR:L - VMW_EXECBUF is registered with DRM_RENDER_ALLOW, so any local process with access to the vmwgfx render node (/dev/dri/renderD*) and a user-created 3D context can submit the malicious DRAW_PRIMITIVES command without real root.\nUI:N - Exploitation requires only the attacker opening the render device and issuing crafted execbuf ioctls; no additional actions by another user or administrator are needed.\nS:U - Impact is confined to the guest kernel address space running vmwgfx (VMware SVGA virtual GPU); successful exploitation yields guest-kernel memory disclosure/corruption and privilege escalation, not a direct hypervisor/host escape.\nC:H - Unsigned underflow makes maxnum enormous, so the vertex-declaration loop dereferences decl[i] far beyond the vmalloc command bounce buffer and reads adjacent kernel heap memory (e.g., decl-\u003earray.surfaceId) into validation paths.\nI:H - Beyond disclosure, leaked/adjacent surfaceId values can satisfy vmw_user_resource_lookup_handle and vmw_resource_relocations_apply then writes resource IDs to offsets past the bounce buffer, giving an out-of-bounds kernel write primitive.\nA:H - Setting a large numVertexDecls after the bound bypass can walk far past the vmalloc allocation and fault on unmapped pages, and extensive heap corruption from relocation writes can also trigger kernel oops/panic."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:36:38.535Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b89ca4bba820f79dde52af15ee139fe6e8bbc314"
        },
        {
          "url": "https://git.kernel.org/stable/c/bef30317fcb4c838a37bceb2fc76256eb6b975c1"
        },
        {
          "url": "https://git.kernel.org/stable/c/112c6ff29a56f3a22db4d5af869697aa07035ad6"
        },
        {
          "url": "https://git.kernel.org/stable/c/2666cddf0dd218aa9bd1f99db688d1b532eac21a"
        },
        {
          "url": "https://git.kernel.org/stable/c/fc0c02f510e41650df3479f96e257acf87d8a20a"
        },
        {
          "url": "https://git.kernel.org/stable/c/dc0be7662b7b0ce28cb5eea864737793ed7b9e70"
        },
        {
          "url": "https://git.kernel.org/stable/c/c77cf8edae2bd3a1599115301cc7c98d0c78e731"
        },
        {
          "url": "https://git.kernel.org/stable/c/85891d174707d8bddcec7a888fb4e1d17def34f3"
        }
      ],
      "title": "drm/vmwgfx: validate DRAW_PRIMITIVES header size before division",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74444",
    "datePublished": "2026-08-15T12:26:51.443Z",
    "dateReserved": "2026-08-15T05:44:03.898Z",
    "dateUpdated": "2026-08-19T16:36:38.535Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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