ext4: fix use-after-free in ext4_rename_dir_prepare

{
  "id": "fcdaf2e78de29c8eebf9918adf48814c4f4617038a46fba4644624bf306a8b53",
  "url": "https://osv.dev/vulnerability/CVE-2022-49349",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ext4: fix use-after-free in ext4_rename_dir_prepare",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ext4: fix use-after-free in ext4_rename_dir_prepare We got issue as follows: EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue ext4_get_first_dir_block: bh->b_data=0xffff88810bee6000 len=34478 ext4_get_first_dir_block: *parent_de=0xffff88810beee6ae bh->b_data=0xffff88810bee6000 ext4_rename_dir_prepare: [1] parent_de=0xffff88810beee6ae ================================================================== BUG: KASAN: use-after-free in ext4_rename_dir_prepare+0x152/0x220 Read of size 4 at addr ffff88810beee6ae by task rep/1895 CPU: 13 PID: 1895 Comm: rep Not tainted 5.10.0+ #241 Call Trace: dump_stack+0xbe/0xf9 print_address_description.constprop.0+0x1e/0x220 kasan_report.cold+0x37/0x7f ext4_rename_dir_prepare+0x152/0x220 ext4_rename+0xf44/0x1ad0 ext4_rename2+0x11c/0x170 vfs_rename+0xa84/0x1440 do_renameat2+0x683/0x8f0 __x64_sys_renameat+0x53/0x60 do_syscall_64+0x33/0x40 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f45a6fc41c9 RSP: 002b:00007ffc5a470218 EFLAGS: 00000246 ORIG_RAX: 0000000000000108 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f45a6fc41c9 RDX: 0000000000000005 RSI: 0000000020000180 RDI: 0000000000000005 RBP: 00007ffc5a470240 R08: 00007ffc5a470160 R09: 0000000020000080 R10: 00000000200001c0 R11: 0000000000000246 R12: 0000000000400bb0 R13: 00007ffc5a470320 R14: 0000000000000000 R15: 0000000000000000 The buggy address belongs to the page: page:00000000440015ce ",
    "evidence": "osv:CVE-2022-49349",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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          {
            "value": "5.17.14",
            "evidence": "/affected/1/ranges"
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          {
            "value": "5.18.3",
            "evidence": "/affected/1/ranges"
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        "affected_versions": []
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    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2022-49349",
      "aliases": [
        "CVE-2022-49349"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
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              "type": "GIT",
              "events": [
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:28.751719846Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0be698ecbe4471fcad80e81ec6a05001421041b3",
        "https://git.kernel.org/stable/c/0ff38b99fa075ddd246487a28cb9af049f4ceef1",
        "https://git.kernel.org/stable/c/10801095224de0d0ab06ae60698680c1f883a3ae",
        "https://git.kernel.org/stable/c/1a3a15bf6f9963d755270cbdb282863b84839195",
        "https://git.kernel.org/stable/c/364380c00912bed9b5d99eb485018360b0ecf64f",
        "https://git.kernel.org/stable/c/4a2bea60cf7ff957b3eda0b17750d483876a02fa",
        "https://git.kernel.org/stable/c/97f802a652a749422dede32071d29a53cf4bd034",
        "https://git.kernel.org/stable/c/dd887f83ea54aea5b780a84527e23ab95f777fed",
        "https://git.kernel.org/stable/c/eaecf7ebfd5dd09038a80b14be46b844f54cfc5c",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49349.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-49349",
        "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/2022/49xxx/CVE-2022-49349.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-49349",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 495042,
  "published_at": "2025-02-26T02:11:02.993+00:00"
}