{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-39276",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-39276"
  ],
  "published": "2024-06-25T14:22:58Z",
  "summary": "ext4: fix mb_cache_entry's e_refcnt leak in ext4_xattr_block_cache_find()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix mb_cache_entry's e_refcnt leak in ext4_xattr_block_cache_find()\n\nSyzbot reports a warning as follows:\n\n============================================\nWARNING: CPU: 0 PID: 5075 at fs/mbcache.c:419 mb_cache_destroy+0x224/0x290\nModules linked in:\nCPU: 0 PID: 5075 Comm: syz-executor199 Not tainted 6.9.0-rc6-gb947cc5bf6d7\nRIP: 0010:mb_cache_destroy+0x224/0x290 fs/mbcache.c:419\nCall Trace:\n <TASK>\n ext4_put_super+0x6d4/0xcd0 fs/ext4/super.c:1375\n generic_shutdown_super+0x136/0x2d0 fs/super.c:641\n kill_block_super+0x44/0x90 fs/super.c:1675\n ext4_kill_sb+0x68/0xa0 fs/ext4/super.c:7327\n[...]\n============================================\n\nThis is because when finding an entry in ext4_xattr_block_cache_find(), if\next4_sb_bread() returns -ENOMEM, the ce's e_refcnt, which has already grown\nin the __entry_find(), won't be put away, and eventually trigger the above\nissue in mb_cache_destroy() due to reference count leakage.\n\nSo call mb_cache_entry_put() on the -ENOMEM error branch as a quick fix.",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-39276"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9ad75e78747b5a50dc5a52f0f8e92e920a653f16"
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      "url": "https://git.kernel.org/stable/c/896a7e7d0d555ad8b2b46af0c2fa7de7467f9483"
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      "url": "https://git.kernel.org/stable/c/681ff9a09accd8a4379f8bd30b7a1641ee19bb3e"
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      "url": "https://git.kernel.org/stable/c/a95df6f04f2c37291adf26a74205cde0314d4577"
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    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-24T06:48:58Z"
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}