{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-22121",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-22121"
  ],
  "published": "2025-04-16T14:14:59Z",
  "summary": "ext4: fix out-of-bound read in ext4_xattr_inode_dec_ref_all()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix out-of-bound read in ext4_xattr_inode_dec_ref_all()\n\nThere's issue as follows:\nBUG: KASAN: use-after-free in ext4_xattr_inode_dec_ref_all+0x6ff/0x790\nRead of size 4 at addr ffff88807b003000 by task syz-executor.0/15172\n\nCPU: 3 PID: 15172 Comm: syz-executor.0\nCall Trace:\n __dump_stack lib/dump_stack.c:82 [inline]\n dump_stack+0xbe/0xfd lib/dump_stack.c:123\n print_address_description.constprop.0+0x1e/0x280 mm/kasan/report.c:400\n __kasan_report.cold+0x6c/0x84 mm/kasan/report.c:560\n kasan_report+0x3a/0x50 mm/kasan/report.c:585\n ext4_xattr_inode_dec_ref_all+0x6ff/0x790 fs/ext4/xattr.c:1137\n ext4_xattr_delete_inode+0x4c7/0xda0 fs/ext4/xattr.c:2896\n ext4_evict_inode+0xb3b/0x1670 fs/ext4/inode.c:323\n evict+0x39f/0x880 fs/inode.c:622\n iput_final fs/inode.c:1746 [inline]\n iput fs/inode.c:1772 [inline]\n iput+0x525/0x6c0 fs/inode.c:1758\n ext4_orphan_cleanup fs/ext4/super.c:3298 [inline]\n ext4_fill_super+0x8c57/0xba40 fs/ext4/super.c:5300\n mount_bdev+0x355/0x410 fs/super.c:1446\n legacy_get_tree+0xfe/0x220 fs/fs_context.c:611\n vfs_get_tree+0x8d/0x2f0 fs/super.c:1576\n do_new_mount fs/namespace.c:2983 [inline]\n path_mount+0x119a/0x1ad0 fs/namespace.c:3316\n do_mount+0xfc/0x110 fs/namespace.c:3329\n __do_sys_mount fs/namespace.c:3540 [inline]\n __se_sys_mount+0x219/0x2e0 fs/namespace.c:3514\n do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46\n entry_SYSCALL_64_after_hwframe+0x67/0xd1\n\nMemory state around the buggy address:\n ffff88807b002f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n ffff88807b002f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n>ffff88807b003000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n                   ^\n ffff88807b003080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n ffff88807b003100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n\nAbove issue happens as ext4_xattr_delete_inode() isn't check xattr\nis valid if xattr is in inode.\nTo solve above issue call xattr_check_inode() check if xattr if valid\nin inode. In fact, we can directly verify in ext4_iget_extra_inode(),\nso that there is no divergent verification.",
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