{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38333",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-38333"
  ],
  "published": "2025-07-10T08:18:24Z",
  "summary": "f2fs: fix to bail out in get_new_segment()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to bail out in get_new_segment()\n\n------------[ cut here ]------------\nWARNING: CPU: 3 PID: 579 at fs/f2fs/segment.c:2832 new_curseg+0x5e8/0x6dc\npc : new_curseg+0x5e8/0x6dc\nCall trace:\n new_curseg+0x5e8/0x6dc\n f2fs_allocate_data_block+0xa54/0xe28\n do_write_page+0x6c/0x194\n f2fs_do_write_node_page+0x38/0x78\n __write_node_page+0x248/0x6d4\n f2fs_sync_node_pages+0x524/0x72c\n f2fs_write_checkpoint+0x4bc/0x9b0\n __checkpoint_and_complete_reqs+0x80/0x244\n issue_checkpoint_thread+0x8c/0xec\n kthread+0x114/0x1bc\n ret_from_fork+0x10/0x20\n\nget_new_segment() detects inconsistent status in between free_segmap\nand free_secmap, let's record such error into super block, and bail\nout get_new_segment() instead of continue using the segment.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38333"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f0023d7a2a86999c8e1300e911d92f995a5310a8"
    },
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      "url": "https://git.kernel.org/stable/c/ca860f507a61c7c3d4dde47b830a5c0d555cf83c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bb5eb8a5b222fa5092f60d5555867a05ebc3bdf2"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - get_new_segment() is reached only through the f2fs allocator on a locally mounted volume \u2014 ordinary writes, fsync, GC, or the background checkpoint thread; there is no network-facing consumer of this code.\nAC:L - Once the free_segmap/free_secmap divergence exists \u2014 from attacker-supplied on-disk metadata on removable f2fs media or the in-kernel state divergence observed in the field \u2014 the condition is hit deterministically on the next allocation from that section, with no race window or memory layout the attacker must win.\nPR:L - On an already-mounted f2fs volume (Android /data, auto-mounted SD/USB), any unprivileged local user with write access drives segment allocation via normal file writes and fsync; no capability or CAP_SYS_ADMIN is needed for the trigger itself.\nUI:N - The reported failure fires on the background checkpoint kthread during ordinary operation on an already-mounted filesystem, and removable f2fs media are auto-mounted by vold/udisks2 without any action by another user.\nS:U - The corruption is confined to the kernel/f2fs security authority on the same host; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The already-in-use segment is handed out as a new current segment starting at block offset 0, so the same physical blocks become mapped by two different inodes and a reader of one file obtains blocks written for another user's file on a shared filesystem.\nI:H - Live data and node blocks belonging to other files are physically overwritten, SIT valid_blocks/cur_valid_map are corrupted, and the underflowed free_segments count is persisted into the on-disk checkpoint (ckpt->free_segment_count is never validated on read), so the damage survives reboot.\nA:H - With CONFIG_F2FS_CHECK_FS the f2fs_bug_on is a plain BUG_ON taken while holding free_i->segmap_lock on the checkpoint kthread \u2014 an immediate panic; otherwise the free_segments/free_sections underflow defeats GC accounting and the downstream f2fs_bug_on()s and -ENOSPC path end in f2fs_stop_checkpoint(), shutting the filesystem down."
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  }
}