drm/panthor: validate userspace queue count against initialized firmware slot count

{
  "id": "4ad68abde7277d4dc287ed74e57223ed3a6c8658eb571b5a466316de2a929e09",
  "url": "https://osv.dev/vulnerability/CVE-2026-99003",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm/panthor: validate userspace queue count against initialized firmware slot count",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: drm/panthor: validate userspace queue count against initialized firmware slot count In panthor_drv.c:panthor_ioctl_group_create(), the queue count is validated against the hardcoded maximum: if (!args->queues.count || args->queues.count > MAX_CS_PER_CSG) return -EINVAL; However, if the firmware reports fewer slots than MAX_CS_PER_CSG, panthor_fw_init_ifaces() will only initialize that smaller number of stream interfaces. If unprivileged userspace requests more queues than the firmware reported (but no more than MAX_CS_PER_CSG), cs_slot_prog_locked() fetches an uninitialized stream interface and may crash when dereferencing cs_iface->input->ringbuf_base.",
    "evidence": "osv:CVE-2026-99003",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.113",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.57",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.11",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-99003",
      "aliases": [
        "CVE-2026-99003"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "de85488138247d034eb3241840424a54d660926b"
                },
                {
                  "fixed": "4487cf79bf173f2b426a02d102076f8a20d23b96"
                },
                {
                  "fixed": "fdee3570b282a6c8699aea63fa5694355e010ec9"
                },
                {
                  "fixed": "9be126be5f78bc331a930295af97c9b1f9158f06"
                },
                {
                  "fixed": "ec86c43dcfff68eab4db9bdafcd3e2b16e342e18"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-99003.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.10.0"
                },
                {
                  "fixed": "6.12.113"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.57"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.11"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-99003.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.168531958Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/4487cf79bf173f2b426a02d102076f8a20d23b96",
        "https://git.kernel.org/stable/c/9be126be5f78bc331a930295af97c9b1f9158f06",
        "https://git.kernel.org/stable/c/ec86c43dcfff68eab4db9bdafcd3e2b16e342e18",
        "https://git.kernel.org/stable/c/fdee3570b282a6c8699aea63fa5694355e010ec9",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99003.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-99003",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99003.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-99003",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 492043,
  "published_at": "2026-10-23T12:20:24.476+00:00"
}