FKIE_CVE-2026-74442

Vulnerability from fkie_nvd - Published: 2026-08-15 13:17 - Updated: 2026-08-17 06:19
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/vmwgfx: avoid destroy_workqueue(NULL) on vkms init failure Two paths through vmw_vkms_init() can leave vmw->crc_workq NULL while still leaving the rest of the driver in a state that calls vmw_vkms_cleanup() at module unload: 1. vmw_host_get_guestinfo(GUESTINFO_VBLANK, ...) failing or returning an oversized buffer -- the common case on hosts without a VBLANK guestinfo entry -- early-returned before the workqueue allocation. 2. alloc_ordered_workqueue() returning NULL on memory pressure. vmw_vkms_cleanup() then calls destroy_workqueue(NULL), which dereferences wq->name and panics. Fix the first case by removing the early return: vmw->vkms_enabled is already false on the rpci-failure path so no work will ever be queued, and allocating the workqueue unconditionally keeps the control flow simple. Fix the second case by guarding the cleanup with a NULL check, since alloc_ordered_workqueue() can still fail under low memory.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/05eaa887e7b4f40fba425f8a1d7a5a8a043092a6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0ee0532f1d405d37f38c44cbba87342e63d3bbd4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7c701778c6a369769992614dac8dc00c8ac72afc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/96efee36453b697ccbaf75091b7a1807c11809dd
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/vmwgfx/vmwgfx_vkms.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7c701778c6a369769992614dac8dc00c8ac72afc",
              "status": "affected",
              "version": "7b0062036c3b71b4a69e244ecf0502c06c4cf5f0",
              "versionType": "git"
            },
            {
              "lessThan": "96efee36453b697ccbaf75091b7a1807c11809dd",
              "status": "affected",
              "version": "7b0062036c3b71b4a69e244ecf0502c06c4cf5f0",
              "versionType": "git"
            },
            {
              "lessThan": "0ee0532f1d405d37f38c44cbba87342e63d3bbd4",
              "status": "affected",
              "version": "7b0062036c3b71b4a69e244ecf0502c06c4cf5f0",
              "versionType": "git"
            },
            {
              "lessThan": "05eaa887e7b4f40fba425f8a1d7a5a8a043092a6",
              "status": "affected",
              "version": "7b0062036c3b71b4a69e244ecf0502c06c4cf5f0",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/vmwgfx/vmwgfx_vkms.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "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"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vmwgfx: avoid destroy_workqueue(NULL) on vkms init failure\n\nTwo paths through vmw_vkms_init() can leave vmw-\u003ecrc_workq NULL while\nstill leaving the rest of the driver in a state that calls\nvmw_vkms_cleanup() at module unload:\n\n  1. vmw_host_get_guestinfo(GUESTINFO_VBLANK, ...) failing or\n     returning an oversized buffer -- the common case on hosts\n     without a VBLANK guestinfo entry -- early-returned before the\n     workqueue allocation.\n  2. alloc_ordered_workqueue() returning NULL on memory pressure.\n\nvmw_vkms_cleanup() then calls destroy_workqueue(NULL), which\ndereferences wq-\u003ename and panics.\n\nFix the first case by removing the early return: vmw-\u003evkms_enabled\nis already false on the rpci-failure path so no work will ever be\nqueued, and allocating the workqueue unconditionally keeps the\ncontrol flow simple.  Fix the second case by guarding the cleanup\nwith a NULL check, since alloc_ordered_workqueue() can still fail\nunder low memory."
    }
  ],
  "id": "CVE-2026-74442",
  "lastModified": "2026-08-17T06:19:39.970",
  "metrics": {},
  "published": "2026-08-15T13:17:48.760",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/05eaa887e7b4f40fba425f8a1d7a5a8a043092a6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0ee0532f1d405d37f38c44cbba87342e63d3bbd4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7c701778c6a369769992614dac8dc00c8ac72afc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/96efee36453b697ccbaf75091b7a1807c11809dd"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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