{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-21887",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-21887"
  ],
  "published": "2025-03-27T15:01:31Z",
  "summary": "ovl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\novl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up\n\nThe issue was caused by dput(upper) being called before\novl_dentry_update_reval(), while upper->d_flags was still\naccessed in ovl_dentry_remote().\n\nMove dput(upper) after its last use to prevent use-after-free.\n\nBUG: KASAN: slab-use-after-free in ovl_dentry_remote fs/overlayfs/util.c:162 [inline]\nBUG: KASAN: slab-use-after-free in ovl_dentry_update_reval+0xd2/0xf0 fs/overlayfs/util.c:167\n\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0xc3/0x620 mm/kasan/report.c:488\n kasan_report+0xd9/0x110 mm/kasan/report.c:601\n ovl_dentry_remote fs/overlayfs/util.c:162 [inline]\n ovl_dentry_update_reval+0xd2/0xf0 fs/overlayfs/util.c:167\n ovl_link_up fs/overlayfs/copy_up.c:610 [inline]\n ovl_copy_up_one+0x2105/0x3490 fs/overlayfs/copy_up.c:1170\n ovl_copy_up_flags+0x18d/0x200 fs/overlayfs/copy_up.c:1223\n ovl_rename+0x39e/0x18c0 fs/overlayfs/dir.c:1136\n vfs_rename+0xf84/0x20a0 fs/namei.c:4893\n...\n </TASK>",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-21887"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f77618291836168eca99e89cd175256f928f5e64"
    },
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4b49d939b5a79117f939b77cc67efae2694d9799"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a7c41830ffcd17b2177a95a9b99b270302090c35"
    },
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      "url": "https://git.kernel.org/stable/c/64455c8051c3aedc71abb7ec8d47c80301f99f00"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3594aad97e7be2557ca9fa9c931b206b604028c8"
    },
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/60b4b5c1277fc491da9e1e7abab307bfa39c2db7"
    },
    {
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      "url": "https://git.kernel.org/stable/c/c84e125fff2615b4d9c259e762596134eddd2f27"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z"
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}