CVE-2025-21887 Information

Description

In the Linux kernel the following vulnerability has been resolved:

ovl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up

The issue was caused by dput(upper) being called before ovl_dentry_update_reval() while upper->d_flags was still accessed in ovl_dentry_remote().

Move dput(upper) after its last use to prevent use-after-free.

BUG: KASAN: slab-use-after-free in ovl_dentry_remote fs/overlayfs/util.c:162 [inline] BUG: KASAN: slab-use-after-free in ovl_dentry_update_reval+0xd2/0xf0 fs/overlayfs/util.c:167

Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 ovl_dentry_remote fs/overlayfs/util.c:162 [inline] ovl_dentry_update_reval+0xd2/0xf0 fs/overlayfs/util.c:167 ovl_link_up fs/overlayfs/copy_up.c:610 [inline] ovl_copy_up_one+0x2105/0x3490 fs/overlayfs/copy_up.c:1170 ovl_copy_up_flags+0x18d/0x200 fs/overlayfs/copy_up.c:1223 ovl_rename+0x39e/0x18c0 fs/overlayfs/dir.c:1136 vfs_rename+0xf84/0x20a0 fs/namei.c:4893 …

Reference

https://git.kernel.org/stable/c/3594aad97e7be2557ca9fa9c931b206b604028c8 https://git.kernel.org/stable/c/4b49d939b5a79117f939b77cc67efae2694d9799 https://git.kernel.org/stable/c/60b4b5c1277fc491da9e1e7abab307bfa39c2db7 https://git.kernel.org/stable/c/64455c8051c3aedc71abb7ec8d47c80301f99f00 https://git.kernel.org/stable/c/a7c41830ffcd17b2177a95a9b99b270302090c35 https://git.kernel.org/stable/c/c84e125fff2615b4d9c259e762596134eddd2f27