CVE-2026-98508 (GCVE-0-2026-98508)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:17 – Updated: 2026-10-19 09:20
VLAI
Title
drm/virtio: fix NULL pointer dereference on fence allocation failure
Summary
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 R0virtio_gpu_virgl_process_cmd: ctrl 0x102, error 0x1203 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880132c4000 R13: 0000000000000000 R14: ffff888073b6c700 R15: 000000000000003b FS: 00007fab480b96c0(0000) GS:ffff8880eb6e9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007effbf5e55a8 CR3: 0000000048d19000 CR4: 0000000000350ef0 Call Trace: <TASK> drm_ioctl_kernel+0x1f4/0x3e0 drivers/gpu/drm/drm_ioctl.c:817 drm_ioctl+0x5f4/0xc70 drivers/gpu/drm/drm_ioctl.c:914 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x116/0x800 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fab471a82bd Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fab480b9018 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fab47435fa0 RCX: 00007fab471a82bd RDX: 00002000000000c0 RSI: 00000000c0406442 RDI: 0000000000000003 RBP: 00007fab480b9080 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fab47436038 R14: 00007fab47435fa0 R15: 00007ffe85ab0740 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- 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 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880132c4000 R13: 0000000000000000 R14: ffff888073b6c700 R15: 000000000000003b FS: 00007fab480b96c0(0000) GS:ffff888098ae9000(0000) knlGS:00000000 ---truncated---
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6856 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 70d1ace56db6c79d39dbe9c0d5244452b67e2fde , < 9571ab7493561afb4624d69572a7ebb67d76d10f (git)
Affected: 70d1ace56db6c79d39dbe9c0d5244452b67e2fde , < a8b83ed4a4b1d04c756f53e375e86d3881f66e72 (git)
Affected: 70d1ace56db6c79d39dbe9c0d5244452b67e2fde , < f2f1683955b95c9b958069da3050f7e8e129ff88 (git)
Affected: 70d1ace56db6c79d39dbe9c0d5244452b67e2fde , < ecced0076b700b5896e52af10d0776be8be36b0d (git)
Affected: 70d1ace56db6c79d39dbe9c0d5244452b67e2fde , < 846b3c64fe3e77d9db20a7e3e62dbbb637c773e1 (git)
Affected: 98d3e7c5f757577394f036e0301db9e570342566 (git)
Affected: 4037dcd70c3335600a2a95ec6229d70859bd37a1 (git)
Affected: 6.1.54 , < 6.2 (semver)
Affected: 6.5.4 , < 6.6 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.55 , ≤ 6.18.* (semver)
Unaffected: 7.2.9 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/virtio/virtgpu_submit.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "9571ab7493561afb4624d69572a7ebb67d76d10f",
              "status": "affected",
              "version": "70d1ace56db6c79d39dbe9c0d5244452b67e2fde",
              "versionType": "git"
            },
            {
              "lessThan": "a8b83ed4a4b1d04c756f53e375e86d3881f66e72",
              "status": "affected",
              "version": "70d1ace56db6c79d39dbe9c0d5244452b67e2fde",
              "versionType": "git"
            },
            {
              "lessThan": "f2f1683955b95c9b958069da3050f7e8e129ff88",
              "status": "affected",
              "version": "70d1ace56db6c79d39dbe9c0d5244452b67e2fde",
              "versionType": "git"
            },
            {
              "lessThan": "ecced0076b700b5896e52af10d0776be8be36b0d",
              "status": "affected",
              "version": "70d1ace56db6c79d39dbe9c0d5244452b67e2fde",
              "versionType": "git"
            },
            {
              "lessThan": "846b3c64fe3e77d9db20a7e3e62dbbb637c773e1",
              "status": "affected",
              "version": "70d1ace56db6c79d39dbe9c0d5244452b67e2fde",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "98d3e7c5f757577394f036e0301db9e570342566",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4037dcd70c3335600a2a95ec6229d70859bd37a1",
              "versionType": "git"
            },
            {
              "lessThan": "6.2",
              "status": "affected",
              "version": "6.1.54",
              "versionType": "semver"
            },
            {
              "lessThan": "6.6",
              "status": "affected",
              "version": "6.5.4",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/virtio/virtgpu_submit.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.6"
            },
            {
              "lessThan": "6.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.55",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.158",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.112",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.55",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.9",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.1.54",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.5.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/virtio: fix NULL pointer dereference on fence allocation failure\n\nvirtio_gpu_fence_alloc() can fail due to memory pressure and return NULL,\nbut its caller like virtio_gpu_init_submit() never checks it. Later,\nvirtio_gpu_init_submit() passes the NULL fence to\nvirtio_gpu_fence_event_create(), which unconditionally dereferences it.\n\nFound when fuzzing the virtio driver with Syzkaller:\n\n\tOops: general protection fault, probably for non-canonical address 0xdffffc0000000012: 0000 [#1] SMP KASAN NOPTI\n\tKASAN: null-ptr-deref in range [0x0000000000000090-0x0000000000000097]\n\tCPU: 1 UID: 0 PID: 9991 Comm: syz.0.121 Not tainted 7.2.0 #4 PREEMPT(full)\n\tHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014\n\tRIP: 0010:virtio_gpu_fence_event_create drivers/gpu/drm/virtio/virtgpu_submit.c:295 [inline]\n\tRIP: 0010:virtio_gpu_init_submit drivers/gpu/drm/virtio/virtgpu_submit.c:398 [inline]\n\tRIP: 0010:virtio_gpu_execbuffer_ioctl+0xc78/0x1aa0 drivers/gpu/drm/virtio/virtgpu_submit.c:505\n\tCode: 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 \u003c80\u003e 3c 02 00 0f 85 9a 0d 00 00 48 8b 44 24 10 4c 89 b0 90 00 00 00\n\tRSP: 0018:ffffc900039dfad0 EFLAGS: 00010216\n\tRAX: dffffc0000000000 RBX: ffffc900039dfdd8 RCX: ffffffff85f6fd3d\n\tRDX: 0000000000000012 RSI: ffffffff85f6fd4b RDI: 0000000000000090\n\tRBP: 0000000000000000 R0virtio_gpu_virgl_process_cmd: ctrl 0x102, error 0x1203\n\tR10: 0000000000000000 R11: 0000000000000000 R12: ffff8880132c4000\n\tR13: 0000000000000000 R14: ffff888073b6c700 R15: 000000000000003b\n\tFS:  00007fab480b96c0(0000) GS:ffff8880eb6e9000(0000) knlGS:0000000000000000\n\tCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n\tCR2: 00007effbf5e55a8 CR3: 0000000048d19000 CR4: 0000000000350ef0\n\tCall Trace:\n\t\u003cTASK\u003e\n\tdrm_ioctl_kernel+0x1f4/0x3e0 drivers/gpu/drm/drm_ioctl.c:817\n\tdrm_ioctl+0x5f4/0xc70 drivers/gpu/drm/drm_ioctl.c:914\n\tvfs_ioctl fs/ioctl.c:51 [inline]\n\t__do_sys_ioctl fs/ioctl.c:597 [inline]\n\t__se_sys_ioctl fs/ioctl.c:583 [inline]\n\t__x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583\n\tdo_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n\tdo_syscall_64+0x116/0x800 arch/x86/entry/syscall_64.c:94\n\tentry_SYSCALL_64_after_hwframe+0x77/0x7f\n\tRIP: 0033:0x7fab471a82bd\n\tCode: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48\n\tRSP: 002b:00007fab480b9018 EFLAGS: 00000246 ORIG_RAX: 0000000000000010\n\tRAX: ffffffffffffffda RBX: 00007fab47435fa0 RCX: 00007fab471a82bd\n\tRDX: 00002000000000c0 RSI: 00000000c0406442 RDI: 0000000000000003\n\tRBP: 00007fab480b9080 R08: 0000000000000000 R09: 0000000000000000\n\tR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001\n\tR13: 00007fab47436038 R14: 00007fab47435fa0 R15: 00007ffe85ab0740\n\t\u003c/TASK\u003e\n\tModules linked in:\n\t---[ end trace 0000000000000000 ]---\n\tRIP: 0010:virtio_gpu_fence_event_create drivers/gpu/drm/virtio/virtgpu_submit.c:295 [inline]\n\tRIP: 0010:virtio_gpu_init_submit drivers/gpu/drm/virtio/virtgpu_submit.c:398 [inline]\n\tRIP: 0010:virtio_gpu_execbuffer_ioctl+0xc78/0x1aa0 drivers/gpu/drm/virtio/virtgpu_submit.c:505\n\tCode: 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 \u003c80\u003e 3c 02 00 0f 85 9a 0d 00 00 48 8b 44 24 10 4c 89 b0 90 00 00 00\n\tRSP: 0018:ffffc900039dfad0 EFLAGS: 00010216\n\tRAX: dffffc0000000000 RBX: ffffc900039dfdd8 RCX: ffffffff85f6fd3d\n\tRDX: 0000000000000012 RSI: ffffffff85f6fd4b RDI: 0000000000000090\n\tRBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000\n\tR10: 0000000000000000 R11: 0000000000000000 R12: ffff8880132c4000\n\tR13: 0000000000000000 R14: ffff888073b6c700 R15: 000000000000003b\n\tFS:  00007fab480b96c0(0000) GS:ffff888098ae9000(0000) knlGS:00000000\n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:20:47.221Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9571ab7493561afb4624d69572a7ebb67d76d10f"
        },
        {
          "url": "https://git.kernel.org/stable/c/a8b83ed4a4b1d04c756f53e375e86d3881f66e72"
        },
        {
          "url": "https://git.kernel.org/stable/c/f2f1683955b95c9b958069da3050f7e8e129ff88"
        },
        {
          "url": "https://git.kernel.org/stable/c/ecced0076b700b5896e52af10d0776be8be36b0d"
        },
        {
          "url": "https://git.kernel.org/stable/c/846b3c64fe3e77d9db20a7e3e62dbbb637c773e1"
        }
      ],
      "title": "drm/virtio: fix NULL pointer dereference on fence allocation failure",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98508",
    "datePublished": "2026-10-18T15:17:15.082Z",
    "dateReserved": "2026-09-25T10:25:14.354Z",
    "dateUpdated": "2026-10-19T09:20:47.221Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-98508",
      "date": "2026-10-21",
      "epss": "0.002",
      "percentile": "0.09301"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-21T18:36:59.000Z",
      "cve": "CVE-2026-98508",
      "id": "msrc_CVE-2026-98508",
      "initial_release_date": "2026-10-20T01:11:07.000Z",
      "product_status:known_affected": "1",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "drm/virtio: fix NULL pointer dereference on fence allocation failure",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98508.json",
      "version": "3"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/gpu/drm/virtio/virtgpu_submit.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "9571ab7493561afb4624d69572a7ebb67d76d10f",
                    "status": "affected",
                    "version": "70d1ace56db6c79d39dbe9c0d5244452b67e2fde",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "a8b83ed4a4b1d04c756f53e375e86d3881f66e72",
                    "status": "affected",
                    "version": "70d1ace56db6c79d39dbe9c0d5244452b67e2fde",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "f2f1683955b95c9b958069da3050f7e8e129ff88",
                    "status": "affected",
                    "version": "70d1ace56db6c79d39dbe9c0d5244452b67e2fde",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "ecced0076b700b5896e52af10d0776be8be36b0d",
                    "status": "affected",
                    "version": "70d1ace56db6c79d39dbe9c0d5244452b67e2fde",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "846b3c64fe3e77d9db20a7e3e62dbbb637c773e1",
                    "status": "affected",
                    "version": "70d1ace56db6c79d39dbe9c0d5244452b67e2fde",
                    "versionType": "git"
                  },
                  {
                    "status": "affected",
                    "version": "98d3e7c5f757577394f036e0301db9e570342566",
                    "versionType": "git"
                  },
                  {
                    "status": "affected",
                    "version": "4037dcd70c3335600a2a95ec6229d70859bd37a1",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "6.2",
                    "status": "affected",
                    "version": "6.1.54",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "6.6",
                    "status": "affected",
                    "version": "6.5.4",
                    "versionType": "semver"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "drivers/gpu/drm/virtio/virtgpu_submit.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "6.6"
                  },
                  {
                    "lessThan": "6.6",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.158",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.112",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.55",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.2.*",
                    "status": "unaffected",
                    "version": "7.2.9",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.3",
                    "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/virtio: fix NULL pointer dereference on fence allocation failure\n\nvirtio_gpu_fence_alloc() can fail due to memory pressure and return NULL,\nbut its caller like virtio_gpu_init_submit() never checks it. Later,\nvirtio_gpu_init_submit() passes the NULL fence to\nvirtio_gpu_fence_event_create(), which unconditionally dereferences it.\n\nFound when fuzzing the virtio driver with Syzkaller:\n\n\tOops: general protection fault, probably for non-canonical address 0xdffffc0000000012: 0000 [#1] SMP KASAN NOPTI\n\tKASAN: null-ptr-deref in range [0x0000000000000090-0x0000000000000097]\n\tCPU: 1 UID: 0 PID: 9991 Comm: syz.0.121 Not tainted 7.2.0 #4 PREEMPT(full)\n\tHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014\n\tRIP: 0010:virtio_gpu_fence_event_create drivers/gpu/drm/virtio/virtgpu_submit.c:295 [inline]\n\tRIP: 0010:virtio_gpu_init_submit drivers/gpu/drm/virtio/virtgpu_submit.c:398 [inline]\n\tRIP: 0010:virtio_gpu_execbuffer_ioctl+0xc78/0x1aa0 drivers/gpu/drm/virtio/virtgpu_submit.c:505\n\tCode: 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 \u003c80\u003e 3c 02 00 0f 85 9a 0d 00 00 48 8b 44 24 10 4c 89 b0 90 00 00 00\n\tRSP: 0018:ffffc900039dfad0 EFLAGS: 00010216\n\tRAX: dffffc0000000000 RBX: ffffc900039dfdd8 RCX: ffffffff85f6fd3d\n\tRDX: 0000000000000012 RSI: ffffffff85f6fd4b RDI: 0000000000000090\n\tRBP: 0000000000000000 R0virtio_gpu_virgl_process_cmd: ctrl 0x102, error 0x1203\n\tR10: 0000000000000000 R11: 0000000000000000 R12: ffff8880132c4000\n\tR13: 0000000000000000 R14: ffff888073b6c700 R15: 000000000000003b\n\tFS:  00007fab480b96c0(0000) GS:ffff8880eb6e9000(0000) knlGS:0000000000000000\n\tCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n\tCR2: 00007effbf5e55a8 CR3: 0000000048d19000 CR4: 0000000000350ef0\n\tCall Trace:\n\t\u003cTASK\u003e\n\tdrm_ioctl_kernel+0x1f4/0x3e0 drivers/gpu/drm/drm_ioctl.c:817\n\tdrm_ioctl+0x5f4/0xc70 drivers/gpu/drm/drm_ioctl.c:914\n\tvfs_ioctl fs/ioctl.c:51 [inline]\n\t__do_sys_ioctl fs/ioctl.c:597 [inline]\n\t__se_sys_ioctl fs/ioctl.c:583 [inline]\n\t__x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583\n\tdo_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n\tdo_syscall_64+0x116/0x800 arch/x86/entry/syscall_64.c:94\n\tentry_SYSCALL_64_after_hwframe+0x77/0x7f\n\tRIP: 0033:0x7fab471a82bd\n\tCode: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48\n\tRSP: 002b:00007fab480b9018 EFLAGS: 00000246 ORIG_RAX: 0000000000000010\n\tRAX: ffffffffffffffda RBX: 00007fab47435fa0 RCX: 00007fab471a82bd\n\tRDX: 00002000000000c0 RSI: 00000000c0406442 RDI: 0000000000000003\n\tRBP: 00007fab480b9080 R08: 0000000000000000 R09: 0000000000000000\n\tR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001\n\tR13: 00007fab47436038 R14: 00007fab47435fa0 R15: 00007ffe85ab0740\n\t\u003c/TASK\u003e\n\tModules linked in:\n\t---[ end trace 0000000000000000 ]---\n\tRIP: 0010:virtio_gpu_fence_event_create drivers/gpu/drm/virtio/virtgpu_submit.c:295 [inline]\n\tRIP: 0010:virtio_gpu_init_submit drivers/gpu/drm/virtio/virtgpu_submit.c:398 [inline]\n\tRIP: 0010:virtio_gpu_execbuffer_ioctl+0xc78/0x1aa0 drivers/gpu/drm/virtio/virtgpu_submit.c:505\n\tCode: 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 \u003c80\u003e 3c 02 00 0f 85 9a 0d 00 00 48 8b 44 24 10 4c 89 b0 90 00 00 00\n\tRSP: 0018:ffffc900039dfad0 EFLAGS: 00010216\n\tRAX: dffffc0000000000 RBX: ffffc900039dfdd8 RCX: ffffffff85f6fd3d\n\tRDX: 0000000000000012 RSI: ffffffff85f6fd4b RDI: 0000000000000090\n\tRBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000\n\tR10: 0000000000000000 R11: 0000000000000000 R12: ffff8880132c4000\n\tR13: 0000000000000000 R14: ffff888073b6c700 R15: 000000000000003b\n\tFS:  00007fab480b96c0(0000) GS:ffff888098ae9000(0000) knlGS:00000000\n---truncated---"
          }
        ],
        "id": "CVE-2026-98508",
        "lastModified": "2026-10-19T10:19:04.167",
        "metrics": {},
        "published": "2026-10-18T16:17:01.947",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/846b3c64fe3e77d9db20a7e3e62dbbb637c773e1"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9571ab7493561afb4624d69572a7ebb67d76d10f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a8b83ed4a4b1d04c756f53e375e86d3881f66e72"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ecced0076b700b5896e52af10d0776be8be36b0d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f2f1683955b95c9b958069da3050f7e8e129ff88"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-19T12:15:00+00:00",
      "cve": "CVE-2026-98508",
      "id": "CVE-2026-98508",
      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "93",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/virtio: fix NULL pointer dereference on fence allocation failure",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98508.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-19T23:49:56Z",
      "cve": "CVE-2026-98508",
      "id": "CVE-2026-98508",
      "initial_release_date": "2026-10-19T23:49:56Z",
      "product_status:known_affected": "30",
      "product_status:known_not_affected": "318",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98508",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-98508.json",
      "version": "2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.