jbd2: fix data-race and null-ptr-deref in jbd2_journal_dirty_metadata()

{
  "id": "2bab5a60b944ceb097a604d54aa50471ad9bf0ade551ef27b522b928e47bd6b2",
  "url": "https://osv.dev/vulnerability/CVE-2025-38337",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "jbd2: fix data-race and null-ptr-deref in jbd2_journal_dirty_metadata()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: jbd2: fix data-race and null-ptr-deref in jbd2_journal_dirty_metadata() Since handle->h_transaction may be a NULL pointer, so we should change it to call is_handle_aborted(handle) first before dereferencing it. And the following data-race was reported in my fuzzer: ================================================================== BUG: KCSAN: data-race in jbd2_journal_dirty_metadata / jbd2_journal_dirty_metadata write to 0xffff888011024104 of 4 bytes by task 10881 on cpu 1: jbd2_journal_dirty_metadata+0x2a5/0x770 fs/jbd2/transaction.c:1556 __ext4_handle_dirty_metadata+0xe7/0x4b0 fs/ext4/ext4_jbd2.c:358 ext4_do_update_inode fs/ext4/inode.c:5220 [inline] ext4_mark_iloc_dirty+0x32c/0xd50 fs/ext4/inode.c:5869 __ext4_mark_inode_dirty+0xe1/0x450 fs/ext4/inode.c:6074 ext4_dirty_inode+0x98/0xc0 fs/ext4/inode.c:6103 .... read to 0xffff888011024104 of 4 bytes by task 10880 on cpu 0: jbd2_journal_dirty_metadata+0xf2/0x770 fs/jbd2/transaction.c:1512 __ext4_handle_dirty_metadata+0xe7/0x4b0 fs/ext4/ext4_jbd2.c:358 ext4_do_update_inode fs/ext4/inode.c:5220 [inline] ext4_mark_iloc_dirty+0x32c/0xd50 fs/ext4/inode.c:5869 __ext4_mark_inode_dirty+0xe1/0x450 fs/ext4/inode.c:6074 ext4_dirty_inode+0x98/0xc0 fs/ext4/inode.c:6103 .... value changed: 0x00000000 -> 0x00000001 ================================================================== This issue is caused by missing data-race annotation for jh->b_modified. Therefore, the missing",
    "evidence": "osv:CVE-2025-38337",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "5.4.295",
            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-38337",
      "aliases": [
        "CVE-2025-38337"
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            "ecosystem": "Linux"
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      "modified": "2026-10-28T02:30:25.323827094Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/23361b479f2700c00960d3ae9cdc8ededa762d47",
        "https://git.kernel.org/stable/c/2e7c64d7a92c031d016f11c8e8cb05131ab7b75a",
        "https://git.kernel.org/stable/c/43d5e3bb5f1dcd91e30238ea0b59a5f77063f84e",
        "https://git.kernel.org/stable/c/5c1a34ff5b0bfdfd2f9343aa9b08d25df618bac5",
        "https://git.kernel.org/stable/c/a377996d714afb8d4d5f4906336f78510039da29",
        "https://git.kernel.org/stable/c/af98b0157adf6504fade79b3e6cb260c4ff68e37",
        "https://git.kernel.org/stable/c/ec669e5bf409f16e464bfad75f0ba039a45de29a",
        "https://git.kernel.org/stable/c/f78b38af3540b4875147b7b884ee11a27b3dbf4c",
        "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html",
        "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38337.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-38337",
        "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/2025/38xxx/CVE-2025-38337.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-38337",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 491733,
  "published_at": "2025-07-10T08:15:08.396+00:00"
}