{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "ada7486c5668db542a7d361268df931aca5b726a"
            },
            {
              "fixed": "87f9b1528e1ffc1da3615d552c9a06aba5e20b00"
            },
            {
              "fixed": "fea04cf6f2345bc50f15b6638906c35962b89424"
            },
            {
              "fixed": "4e5591c2fc1b30f4ea5e2eab4c3a695acc404e39"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.18.0"
            },
            {
              "fixed": "6.18.32"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46309.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe/uapi: Reject coh_none PAT index for CPU cached memory in madvise\n\nAdd validation in xe_vm_madvise_ioctl() to reject PAT indices with\nXE_COH_NONE coherency mode when applied to CPU cached memory.\n\nUsing coh_none with CPU cached buffers is a security issue. When the\nkernel clears pages before reallocation, the clear operation stays in\nCPU cache (dirty). GPU with coh_none can bypass CPU caches and read\nstale sensitive data directly from DRAM, potentially leaking data from\npreviously freed pages of other processes.\n\nThis aligns with the existing validation in vm_bind path\n(xe_vm_bind_ioctl_validate_bo).\n\nv2(Matthew brost)\n- Add fixes\n- Move one debug print to better place\n\nv3(Matthew Auld)\n- Should be drm/xe/uapi\n- More Cc\n\nv4(Shuicheng Lin)\n- Fix kmem leak issues by the way\n\nv5\n- Remove kmem leak because it has been merged by another patch\n\nv6\n- Remove the fix which is not related to current fix\n\nv7\n- No change\n\nv8\n- Rebase\n\nv9\n- Limit the restrictions to iGPU\n\nv10\n- No change\n\n(cherry picked from commit 016ccdb674b8c899940b3944952c96a6a490d10a)",
  "id": "CVE-2026-46309",
  "modified": "2026-07-10T03:54:20.437583345Z",
  "published": "2026-06-08T15:50:39.689Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4e5591c2fc1b30f4ea5e2eab4c3a695acc404e39"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/87f9b1528e1ffc1da3615d552c9a06aba5e20b00"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fea04cf6f2345bc50f15b6638906c35962b89424"
    },
    {
      "type": "WEB",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46309.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/security/cve/CVE-2026-46309"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46309.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46309"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2486468"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "drm/xe/uapi: Reject coh_none PAT index for CPU cached memory in madvise"
}