arm64: process: Fix context switching MTE store-only tag check

{
  "id": "a65e9e6a2d8c42aa1f2a7b7b948d942b5f5d59368a8bf964c834edbfb2cdd3dd",
  "url": "https://osv.dev/vulnerability/CVE-2026-90094",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "arm64: process: Fix context switching MTE store-only tag check",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: arm64: process: Fix context switching MTE store-only tag check SCTLR_EL1.TCSO0 is set when user opt-in for MTE store-only tag check mode. However, it is not part of SCTLR_USER_MASK which imply that on context switch we never clear SCTLR_EL1.TCSO0, so we are leaking that setting into another task. Fix that by including SCTLR_EL1_TCSO0_MASK into SCTLR_USER_MASK",
    "evidence": "osv:CVE-2026-90094",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.52",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-90094",
      "aliases": [
        "CVE-2026-90094"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "4d51ff5bba00a13ca9b0b24883fa7adb07a167fc"
                },
                {
                  "fixed": "00a73ce437e27fdc636a5ede445a4a491e01788d"
                },
                {
                  "fixed": "2f10bc3ff24c91657887901c3235b803e5055f2b"
                },
                {
                  "fixed": "b8f070ac3167595069feb1f794c127b805115645"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90094.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.17.0"
                },
                {
                  "fixed": "6.18.52"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90094.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.659678469Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/00a73ce437e27fdc636a5ede445a4a491e01788d",
        "https://git.kernel.org/stable/c/2f10bc3ff24c91657887901c3235b803e5055f2b",
        "https://git.kernel.org/stable/c/b8f070ac3167595069feb1f794c127b805115645",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90094.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-90094",
        "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/2026/90xxx/CVE-2026-90094.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-90094",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 521477,
  "published_at": "2026-09-17T16:06:07.494+00:00"
}