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drm/virtio: fix NULL pointer dereference on fence allocation failure

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: drm/virtio: fix NULL pointer dereference on fence allocation failure virtio_gpu_fence_alloc() can fail due to memory pressure and return NULL, but its caller like virtio_gpu_init_submit() never checks it. Later, virtio_gpu_init_submit() passes the NULL fence to virtio_gpu_fence_event_create(), which unconditionally dereferences it. Found when fuzzing the virtio driver with Syzkaller: Oops: general protection fault, probably for non-canonical address 0xdffffc0000000012: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000090-0x0000000000000097] CPU: 1 UID: 0 PID: 9991 Comm: syz.0.121 Not tainted 7.2.0 #4 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014 RIP: 0010:virtio_gpu_fence_event_create drivers/gpu/drm/virtio/virtgpu_submit.c:295 [inline] RIP: 0010:virtio_gpu_init_submit drivers/gpu/drm/virtio/virtgpu_submit.c:398 [inline] RIP: 0010:virtio_gpu_execbuffer_ioctl+0xc78/0x1aa0 drivers/gpu/drm/virtio/virtgpu_submit.c:505 Code: 85 ed 0f 85 21 09 00 00 e8 05 5a c9 fb 48 8b 44 24 10 48 8d b8 90 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 9a 0d 00 00 48 8b 44 24 10 4c 89 b0 90 00 00 00 RSP: 0018:ffffc900039dfad0 EFLAGS: 00010216 RAX: dffffc0000000000 RBX: ffffc900039dfdd8 RCX: ffffffff85f6fd3d RDX: 0000000000000012 RSI: ffffffff85f6fd4b RDI: 0000000000000090 RBP: 0000000000000000 R

Announced Source revision 1
Original source ↗

CVE-2026-98508

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98508

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "70d1ace56db6c79d39dbe9c0d5244452b67e2fde",
        "lessThan": "9571ab7493561afb4624d69572a7ebb67d76d10f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "70d1ace56db6c79d39dbe9c0d5244452b67e2fde",
        "lessThan": "a8b83ed4a4b1d04c756f53e375e86d3881f66e72",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "70d1ace56db6c79d39dbe9c0d5244452b67e2fde",
        "lessThan": "f2f1683955b95c9b958069da3050f7e8e129ff88",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "70d1ace56db6c79d39dbe9c0d5244452b67e2fde",
        "lessThan": "ecced0076b700b5896e52af10d0776be8be36b0d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "70d1ace56db6c79d39dbe9c0d5244452b67e2fde",
        "lessThan": "846b3c64fe3e77d9db20a7e3e62dbbb637c773e1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "98d3e7c5f757577394f036e0301db9e570342566",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4037dcd70c3335600a2a95ec6229d70859bd37a1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6.1.54",
        "lessThan": "6.2",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.5.4",
        "lessThan": "6.6",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "drivers/gpu/drm/virtio/virtgpu_submit.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.6"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.6",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.112",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.55",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.9",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/gpu/drm/virtio/virtgpu_submit.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98508

Source reference: /cveMetadata/cveId

Publisher severity

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Event
#38540 · Revision 1
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