{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "f04d275d94e164d24516c32437c988a323018f63"
            },
            {
              "fixed": "daa0437fe5e451856aaf8fda602a9fc2105bbd54"
            },
            {
              "fixed": "217f64f348c90cba62164e7ff38e0ccf78a5ca09"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.0.0"
            },
            {
              "fixed": "7.2.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98786.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: guard dc_sink dereferences in MST mode validation\n\ndm_dp_mst_is_port_support_mode() reads\naconnector-\u003edc_sink-\u003edsc_caps... for the DSC branch-throughput check,\nand get_conv_frl_bw()'s HDMI-PCON FRL-bandwidth path reads\naconnector-\u003edc_sink-\u003eedid_caps.max_frl_rate, both without a NULL\ncheck. dc_sink is cleared asynchronously on MST unplug, and both\nfunctions run from paths that the driver's own comments document as\nracing that teardown: the connector probe worker's -\u003emode_valid\ncallback and a compositor's atomic check, neither of which holds the\nMST manager lock that the teardown path uses. The former does have an\nexisting dsc_aux NULL check, but dsc_aux isn't reliably cleared in\nevery path that clears dc_sink, so it doesn't cover this.\n\nFail the port-support check and skip the FRL conversion path when the\nsink is already gone.\n\n(cherry picked from commit 7c3db8da4e039698ae198c870712428644e965c7)",
  "id": "CVE-2026-98786",
  "modified": "2026-10-20T02:30:29.408464853Z",
  "published": "2026-10-18T15:48:22.989Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/217f64f348c90cba62164e7ff38e0ccf78a5ca09"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/daa0437fe5e451856aaf8fda602a9fc2105bbd54"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98786.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98786"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "drm/amd/display: guard dc_sink dereferences in MST mode validation"
}