CVE-2026-74442 (GCVE-0-2026-74442)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:26 – Updated: 2026-08-17 05:19
VLAI
Title
drm/vmwgfx: avoid destroy_workqueue(NULL) on vkms init failure
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7b0062036c3b71b4a69e244ecf0502c06c4cf5f0 , < 7c701778c6a369769992614dac8dc00c8ac72afc (git)
Affected: 7b0062036c3b71b4a69e244ecf0502c06c4cf5f0 , < 96efee36453b697ccbaf75091b7a1807c11809dd (git)
Affected: 7b0062036c3b71b4a69e244ecf0502c06c4cf5f0 , < 0ee0532f1d405d37f38c44cbba87342e63d3bbd4 (git)
Affected: 7b0062036c3b71b4a69e244ecf0502c06c4cf5f0 , < 05eaa887e7b4f40fba425f8a1d7a5a8a043092a6 (git)
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Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (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)
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{
  "containers": {
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      "affected": [
        {
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          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/vmwgfx/vmwgfx_vkms.c"
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          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:19:29.387Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74442",
    "datePublished": "2026-08-15T12:26:50.102Z",
    "dateReserved": "2026-08-15T05:44:03.897Z",
    "dateUpdated": "2026-08-17T05:19:29.387Z",
    "state": "PUBLISHED"
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        "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",
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      "cve": "CVE-2026-74442",
      "id": "CVE-2026-74442",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/vmwgfx: avoid destroy_workqueue(NULL) on vkms init failure",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74442.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-18T16:54:23Z",
      "cve": "CVE-2026-74442",
      "id": "CVE-2026-74442",
      "initial_release_date": "2026-08-15T23:52:58Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74442",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74442.json",
      "version": "3"
    }
  }
}



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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.
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