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

Vulnerability from cvelistv5 – Published: 2026-08-15 12:26 – Updated: 2026-08-19 16:36
VLAI
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
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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          "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."
        }
      ],
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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 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."
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    "datePublished": "2026-08-15T12:26:51.443Z",
    "dateReserved": "2026-08-15T05:44:03.898Z",
    "dateUpdated": "2026-08-19T16:36:38.535Z",
    "state": "PUBLISHED"
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      "date": "2026-09-11",
      "epss": "0.00129",
      "percentile": "0.02889"
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      "cve": "CVE-2026-74444",
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      "status": "final",
      "title": "drm/vmwgfx: validate DRAW_PRIMITIVES header size before division",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74444.json",
      "version": "2"
    },
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7a73ba7469cbea631050094fd14f73acebb97cf9\",\"lessThan\":\"b89ca4bba820f79dde52af15ee139fe6e8bbc314\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7a73ba7469cbea631050094fd14f73acebb97cf9\",\"lessThan\":\"bef30317fcb4c838a37bceb2fc76256eb6b975c1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7a73ba7469cbea631050094fd14f73acebb97cf9\",\"lessThan\":\"112c6ff29a56f3a22db4d5af869697aa07035ad6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7a73ba7469cbea631050094fd14f73acebb97cf9\",\"lessThan\":\"2666cddf0dd218aa9bd1f99db688d1b532eac21a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7a73ba7469cbea631050094fd14f73acebb97cf9\",\"lessThan\":\"fc0c02f510e41650df3479f96e257acf87d8a20a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7a73ba7469cbea631050094fd14f73acebb97cf9\",\"lessThan\":\"dc0be7662b7b0ce28cb5eea864737793ed7b9e70\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7a73ba7469cbea631050094fd14f73acebb97cf9\",\"lessThan\":\"c77cf8edae2bd3a1599115301cc7c98d0c78e731\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7a73ba7469cbea631050094fd14f73acebb97cf9\",\"lessThan\":\"85891d174707d8bddcec7a888fb4e1d17def34f3\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.33\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.33\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.151\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.103\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/112c6ff29a56f3a22db4d5af869697aa07035ad6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2666cddf0dd218aa9bd1f99db688d1b532eac21a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/85891d174707d8bddcec7a888fb4e1d17def34f3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b89ca4bba820f79dde52af15ee139fe6e8bbc314\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bef30317fcb4c838a37bceb2fc76256eb6b975c1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c77cf8edae2bd3a1599115301cc7c98d0c78e731\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dc0be7662b7b0ce28cb5eea864737793ed7b9e70\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fc0c02f510e41650df3479f96e257acf87d8a20a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-21T12:01:03+00:00",
      "cve": "CVE-2026-74444",
      "id": "CVE-2026-74444",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/vmwgfx: validate DRAW_PRIMITIVES header size before division",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74444.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-03T00:06:19Z",
      "cve": "CVE-2026-74444",
      "id": "CVE-2026-74444",
      "initial_release_date": "2026-08-15T23:52:56Z",
      "product_status:known_affected": "274",
      "product_status:known_not_affected": "88",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74444",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74444.json",
      "version": "4"
    }
  }
}



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  • 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.