drm/i915: Fix potential UAF in TTM object purge

{
  "id": "00a94849813a4de7ca9bcde486c4a78ec9c04ed3509d6ea16548be3bcdb63879",
  "url": "https://osv.dev/vulnerability/CVE-2026-63884",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm/i915: Fix potential UAF in TTM object purge",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: drm/i915: Fix potential UAF in TTM object purge TLDR: The bo->ttm object might be changed by calling ttm_bo_validate(), move casting it to an i915_tt object later to actually get the right pointer. A user reported hitting the following bug under heavy use on DG2: [26620.095550] Oops: general protection fault, probably for non-canonical address 0xa56b6b6b6b6b6b8b: 0000 1 SMP NOPTI [26620.095556] CPU: 2 UID: 0 PID: 631 Comm: Xorg Not tainted 6.18.8 #1 PREEMPT(lazy) [26620.095558] Hardware name: ASRock B850M Steel Legend WiFi/B850M Steel Legend WiFi, BIOS 3.50 09/18/2025 [26620.095559] RIP: 0010:i915_ttm_purge+0x84/0x100 [i915] [26620.095604] Code: 00 00 00 48 8d 54 24 10 48 89 e6 48 89 fb e8 83 aa ae ff 85 c0 75 6f 48 83 bb a8 01 00 00 00 74 2c 48 8b 45 78 48 85 c0 74 23 <48> 8b 78 20 48 c7 c2 ff ff ff ff 31 f6 e8 7a 73 e3 e0 48 8b 7d 78 [26620.095605] RSP: 0018:ffffc90005fd7430 EFLAGS: 00010282 [26620.095607] RAX: a56b6b6b6b6b6b6b RBX: ffff8881f46c3dc0 RCX: 0000000000000000 [26620.095608] RDX: 0000000000000000 RSI: 0000000000000246 RDI: 00000000ffffffff [26620.095609] RBP: ffff888289610f00 R08: 0000000000000001 R09: ffff88823b022000 [26620.095609] R10: ffff888103029b28 R11: ffff8881fc7f3800 R12: ffff88810b6150d0 [26620.095609] R13: ffff888289610f00 R14: 0000000000000000 R15: ffff8881f46c3dc0 [26620.095610] FS: 00007f1004d86900(0000) GS:ffff88901c858000(0000) knlGS:0000000000000000 [26620.095611] CS: 0010 DS: 0",
    "evidence": "osv:CVE-2026-63884",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.176",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.143",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.93",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.35",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.12",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-63884",
      "aliases": [
        "CVE-2026-63884"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "7ae034590ceaefd4d37465e3434877acfbadf411"
                },
                {
                  "fixed": "df73f3bc731af1c39ac5405bc59c4e7c6f8e9117"
                },
                {
                  "fixed": "28b22dbaf407598cb3bb1d2c586a6f8018690ac2"
                },
                {
                  "fixed": "073bcbc95e9648c976da1654c7590a8d6ee12c2d"
                },
                {
                  "fixed": "c9ae7e7e3bc98615364313b08d7acea5239ded0b"
                },
                {
                  "fixed": "a29654d451bbffe63d584a4cf64ad0efce6bcf1c"
                },
                {
                  "fixed": "5c4063c87a619e4df954c179d24628636f5db15f"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63884.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.17.0"
                },
                {
                  "fixed": "6.1.176"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.143"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.93"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.35"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.12"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63884.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.644286259Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/073bcbc95e9648c976da1654c7590a8d6ee12c2d",
        "https://git.kernel.org/stable/c/28b22dbaf407598cb3bb1d2c586a6f8018690ac2",
        "https://git.kernel.org/stable/c/5c4063c87a619e4df954c179d24628636f5db15f",
        "https://git.kernel.org/stable/c/a29654d451bbffe63d584a4cf64ad0efce6bcf1c",
        "https://git.kernel.org/stable/c/c9ae7e7e3bc98615364313b08d7acea5239ded0b",
        "https://git.kernel.org/stable/c/df73f3bc731af1c39ac5405bc59c4e7c6f8e9117",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63884.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-63884",
        "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/2026/63xxx/CVE-2026-63884.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-63884",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521468,
  "published_at": "2026-07-19T14:54:57.52+00:00"
}