{
  "schema_version": "1.4.0",
  "id": "GHSA-3f3w-qrjm-6m77",
  "modified": "2024-11-12T18:30:50Z",
  "published": "2024-05-17T15:31:09Z",
  "aliases": [
    "CVE-2024-35797"
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: cachestat: fix two shmem bugs\n\nWhen cachestat on shmem races with swapping and invalidation, there\nare two possible bugs:\n\n1) A swapin error can have resulted in a poisoned swap entry in the\n   shmem inode's xarray. Calling get_shadow_from_swap_cache() on it\n   will result in an out-of-bounds access to swapper_spaces[].\n\n   Validate the entry with non_swap_entry() before going further.\n\n2) When we find a valid swap entry in the shmem's inode, the shadow\n   entry in the swapcache might not exist yet: swap IO is still in\n   progress and we're before __remove_mapping; swapin, invalidation,\n   or swapoff have removed the shadow from swapcache after we saw the\n   shmem swap entry.\n\n   This will send a NULL to workingset_test_recent(). The latter\n   purely operates on pointer bits, so it won't crash - node 0, memcg\n   ID 0, eviction timestamp 0, etc. are all valid inputs - but it's a\n   bogus test. In theory that could result in a false \"recently\n   evicted\" count.\n\n   Such a false positive wouldn't be the end of the world. But for\n   code clarity and (future) robustness, be explicit about this case.\n\n   Bail on get_shadow_from_swap_cache() returning NULL.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
    }
  ],
  "affected": [],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-35797"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/24a0e73d544439bb9329fbbafac44299e548a677"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b79f9e1ff27c994a4c452235ba09e672ec698e23"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d5d39c707a4cf0bcc84680178677b97aa2cb2627"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d962f6c583458037dc7e529659b2b02b9dd3d94b"
    }
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-787"
    ],
    "severity": "MODERATE",
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-17T14:15:11Z"
  }
}