mm/vmalloc: take vmap_purge_lock in shrinker

{
  "id": "29a8183b30715e47ad6c9a439ef4beca0ef909cfb48adf224c8f16e543e5b66b",
  "url": "https://osv.dev/vulnerability/CVE-2026-46093",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "mm/vmalloc: take vmap_purge_lock in shrinker",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: mm/vmalloc: take vmap_purge_lock in shrinker decay_va_pool_node() can be invoked concurrently from two paths: __purge_vmap_area_lazy() when pools are being purged, and the shrinker via vmap_node_shrink_scan(). However, decay_va_pool_node() is not safe to run concurrently, and the shrinker path currently lacks serialization, leading to races and possible leaks. Protect decay_va_pool_node() by taking vmap_purge_lock in the shrinker path to ensure serialization with purge users.",
    "evidence": "osv:CVE-2026-46093",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.96",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.27",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-46093",
      "aliases": [
        "CVE-2026-46093"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "7679ba6b36dbb300b757b672d6a32a606499e14b"
                },
                {
                  "fixed": "c15ff206ba78820bf2873d0c668a882e99f4b631"
                },
                {
                  "fixed": "687ccdf582169cd680aeaf24cc953807c4cd4345"
                },
                {
                  "fixed": "12f2341b4c235d5593a433abac201c1c6725787f"
                },
                {
                  "fixed": "ec05f51f1e65bce95528543eb73fda56fd201d94"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46093.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.9.0"
                },
                {
                  "fixed": "6.12.96"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.27"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46093.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.104070122Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/12f2341b4c235d5593a433abac201c1c6725787f",
        "https://git.kernel.org/stable/c/687ccdf582169cd680aeaf24cc953807c4cd4345",
        "https://git.kernel.org/stable/c/c15ff206ba78820bf2873d0c668a882e99f4b631",
        "https://git.kernel.org/stable/c/ec05f51f1e65bce95528543eb73fda56fd201d94",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46093.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-46093",
        "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/2026/46xxx/CVE-2026-46093.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-46093",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517260,
  "published_at": "2026-05-27T12:58:43.458+00:00"
}