{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.0.12-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  erofs: fix managed cache race for unaligned extents  After unaligned compressed extents were introduced, the following race could occur:  [Thread 1]                                   [Thread 2] (z_erofs_fill_bio_vec) \u003chandle a Z_EROFS_PREALLOCATED_FOLIO folio\u003e ... filemap_add_folio (1)                                              (z_erofs_bind_cache)                                              \u003cthe same folio is found..\u003e                                              ..                                              .. folio_attach_private (2)                                              filemap_add_folio (3) again  Since (1) is executed but (2) hasn't been executed yet, it's possible that another thread finds the same managed folio in z_erofs_bind_cache() for a different pcluster and calls filemap_add_folio() again since folio-\u003eprivate is still Z_EROFS_PREALLOCATED_FOLIO.  Fix this by explicitly clearing folio-\u003eprivate before making the folio visible in the managed cache so that another pcluster can simply wait on the locked managed folio as what we did for other shared cases [1].  This only impacts unaligned data compression (`-E48bit` with zstd, for example).  [1] Commit 9e2f9d34dd12 (\"erofs: handle overlapped pclusters out of  crafted images properly\") was originally introduced to handle crafted  overlapped extents, but it addresses unaligned extents as well.",
  "id": "DEBIAN-CVE-2026-64031",
  "modified": "2026-09-15T08:47:33.161615211Z",
  "published": "2026-07-19T16:17:43.250Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-64031"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-64031"
  ]
}