arm_mpam: guard MBWU state before adding it to garbage

{
  "id": "e15548f418d5d4839073efe02110982899fac9d63081440b43af1b06b123d3f2",
  "url": "https://osv.dev/vulnerability/CVE-2026-68345",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "arm_mpam: guard MBWU state before adding it to garbage",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: arm_mpam: guard MBWU state before adding it to garbage __destroy_component_cfg() adds each RIS mbwu_state object to the MPAM garbage list when destroying component configuration. However, mbwu_state is allocated per RIS and only for RISes with MBWU monitors. A component can therefore have comp->cfg allocated while some RISes still have ris->mbwu_state set to NULL. Passing a NULL mbwu_state to add_to_garbage() dereferences the NULL pointer inside the macro. Skip RISes that do not have an mbwu_state object before adding them to the garbage list.",
    "evidence": "osv:CVE-2026-68345",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.1.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-68345",
      "aliases": [
        "CVE-2026-68345"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "41e8a14950e1732af51cfec8fa09f8ded02a5ca9"
                },
                {
                  "fixed": "ca1f96334267ab8d47b2c9d535cdc9920fdde269"
                },
                {
                  "fixed": "977f52909c624210178a1247fab0b02b110c1106"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68345.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.1.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68345.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.542832356Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/977f52909c624210178a1247fab0b02b110c1106",
        "https://git.kernel.org/stable/c/ca1f96334267ab8d47b2c9d535cdc9920fdde269",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68345.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-68345",
        "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/2026/68xxx/CVE-2026-68345.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-68345",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 496429,
  "published_at": "2026-08-10T12:03:22.098+00:00"
}