mm/list_lru: drain before clearing xarray entry on reparent

{
  "id": "93e7b9dcb516daf3939f32d95a1347c319a6303073647950b19b7ea38c702c79",
  "url": "https://osv.dev/vulnerability/CVE-2026-53153",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "mm/list_lru: drain before clearing xarray entry on reparent",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: mm/list_lru: drain before clearing xarray entry on reparent memcg_reparent_list_lrus() clears the dying memcg's xarray entry with xas_store(&xas, NULL) before reparenting its per-node lists into the parent. This opens a window where a concurrent list_lru_del() arriving for the dying memcg sees xa_load() == NULL, walks to the parent in lock_list_lru_of_memcg(), takes the parent's per-node lock, and calls list_del_init() on an item still physically linked on the dying memcg's list. If another in-flight thread holds the dying memcg's per-node lock at the same moment (another list_lru_del, or a list_lru_walk_one running an isolate callback), both threads modify ->next/->prev pointers on the same physical list under different locks. Adjacent items can corrupt each other's links. Fix it by reversing the order: reparent each per-node list and mark the child's list lru dead and then clear the xarray entry. Any concurrent list_lru op that finds the still-set xarray entry either takes the dying memcg's per-node lock (synchronizing with the drain) or sees LONG_MIN and walks to the parent, where the items now live.",
    "evidence": "osv:CVE-2026-53153",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.36",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.13",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-53153",
      "aliases": [
        "CVE-2026-53153"
      ],
      "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": "fb56fdf8b9a2f7397f8a83dce50189f3f0cf71af"
                },
                {
                  "fixed": "c19ff4351214f059349788e13e70e74325831ff6"
                },
                {
                  "fixed": "2b66496d794e98f7aeec7688573051f22ec40bac"
                },
                {
                  "fixed": "98733f3f0becb1ae0701d021c1748e974e5fa55c"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53153.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.36"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.13"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53153.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.811118689Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2b66496d794e98f7aeec7688573051f22ec40bac",
        "https://git.kernel.org/stable/c/98733f3f0becb1ae0701d021c1748e974e5fa55c",
        "https://git.kernel.org/stable/c/c19ff4351214f059349788e13e70e74325831ff6",
        "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53153.json",
        "https://access.redhat.com/errata/RHSA-2026:61887",
        "https://access.redhat.com/security/cve/CVE-2026-53153",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53153.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53153",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2492790",
        "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/2026/53xxx/CVE-2026-53153.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53153",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 495588,
  "published_at": "2026-06-25T08:38:37.521+00:00"
}