drm/i915/sseu: fix max_subslices array-index-out-of-bounds access

{
  "id": "d0d3c13ef0e317f1072e3c3fbcf3285f19c5fc41c7ca2166d980c0174455d674",
  "url": "https://osv.dev/vulnerability/CVE-2023-53112",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm/i915/sseu: fix max_subslices array-index-out-of-bounds access",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: drm/i915/sseu: fix max_subslices array-index-out-of-bounds access It seems that commit bc3c5e0809ae (\"drm/i915/sseu: Don't try to store EU mask internally in UAPI format\") exposed a potential out-of-bounds access, reported by UBSAN as following on a laptop with a gen 11 i915 card: UBSAN: array-index-out-of-bounds in drivers/gpu/drm/i915/gt/intel_sseu.c:65:27 index 6 is out of range for type 'u16 [6]' CPU: 2 PID: 165 Comm: systemd-udevd Not tainted 6.2.0-9-generic #9-Ubuntu Hardware name: Dell Inc. XPS 13 9300/077Y9N, BIOS 1.11.0 03/22/2022 Call Trace: show_stack+0x4e/0x61 dump_stack_lvl+0x4a/0x6f dump_stack+0x10/0x18 ubsan_epilogue+0x9/0x3a __ubsan_handle_out_of_bounds.cold+0x42/0x47 gen11_compute_sseu_info+0x121/0x130 [i915] intel_sseu_info_init+0x15d/0x2b0 [i915] intel_gt_init_mmio+0x23/0x40 [i915] i915_driver_mmio_probe+0x129/0x400 [i915] ? intel_gt_probe_all+0x91/0x2e0 [i915] i915_driver_probe+0xe1/0x3f0 [i915] ? drm_privacy_screen_get+0x16d/0x190 [drm] ? acpi_dev_found+0x64/0x80 i915_pci_probe+0xac/0x1b0 [i915] ... According to the definition of sseu_dev_info, eu_mask->hsw is limited to a maximum of GEN_MAX_SS_PER_HSW_SLICE (6) sub-slices, but gen11_sseu_info_init() can potentially set 8 sub-slices, in the !IS_JSL_EHL(gt->i915) case. Fix this by reserving up to 8 slots for max_subslices in the eu_mask struct. (cherry picked from commit 3cba09a6ac86ea1d456909626eb2685596c07822)",
    "evidence": "osv:CVE-2023-53112",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.21",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.2.8",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2023-53112",
      "aliases": [
        "CVE-2023-53112"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "bc3c5e0809ae9faa039baf75547e8ee46ec124ef"
                },
                {
                  "fixed": "1a1682abf7399318ac074b1f2ac6a8c992b5b3da"
                },
                {
                  "fixed": "36b076ab6247cf0d2135b2ad6bb337617c3b5a1b"
                },
                {
                  "fixed": "193c41926d152761764894f46e23b53c00186a82"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53112.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.0.0"
                },
                {
                  "fixed": "6.1.21"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.2.8"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53112.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.857458825Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/193c41926d152761764894f46e23b53c00186a82",
        "https://git.kernel.org/stable/c/1a1682abf7399318ac074b1f2ac6a8c992b5b3da",
        "https://git.kernel.org/stable/c/36b076ab6247cf0d2135b2ad6bb337617c3b5a1b",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53112.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-53112",
        "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/2023/53xxx/CVE-2023-53112.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-53112",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 521532,
  "published_at": "2025-05-02T15:55:51.733+00:00"
}