{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "4bf97069239bcfca9840936313c7ac35a6e04488"
            },
            {
              "fixed": "fa465a7819ecbe5801b78c088d3cadaf2664b8ca"
            },
            {
              "fixed": "7fee577a2fa78b9a76da015beec1ccf978746ebb"
            },
            {
              "fixed": "298510bbc7c3017c0faf481c6ea66f1065b657b4"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.14.0"
            },
            {
              "fixed": "6.18.57"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99017.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: errata: select RISCV_ALTERNATIVE_EARLY for THEAD GHOSTWRITE\n\nerrata_probe_ghostwrite() only marks the CPU as vulnerable when it is\ncalled at the RISCV_ALTERNATIVES_EARLY_BOOT stage, and the mitigation\nin ghostwrite_enable_mitigation() only takes effect if the vulnerable\nstate was recorded before the boot alternatives are patched.\n\nThe early boot stage is only executed when CONFIG_RISCV_ALTERNATIVE_EARLY\nis enabled, which currently is only selected by ERRATA_THEAD_MAE. In a\nkernel built with ERRATA_THEAD_GHOSTWRITE=y but ERRATA_THEAD_MAE=n, the\nearly alternatives never run, so ghostwrite_state is never set to\nVULNERABLE: ghostwrite_enable_mitigation() returns false, xtheadvector\nremains enabled, and sysfs reports \"Not affected\" on a vulnerable\nT-Head C9xx CPU.\n\nSelect RISCV_ALTERNATIVE_EARLY from ERRATA_THEAD_GHOSTWRITE so that the\nvulnerability is detected in the early boot stage and the default\nmitigation is applied.",
  "id": "CVE-2026-99017",
  "modified": "2026-10-28T02:30:31.520682581Z",
  "published": "2026-10-23T12:20:53.518Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/298510bbc7c3017c0faf481c6ea66f1065b657b4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7fee577a2fa78b9a76da015beec1ccf978746ebb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fa465a7819ecbe5801b78c088d3cadaf2664b8ca"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99017.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99017"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.2",
  "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": "riscv: errata: select RISCV_ALTERNATIVE_EARLY for THEAD GHOSTWRITE"
}