CVE - CVE-2025-21887

CVE-ID
CVE-2025-21887	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE 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: <TASK> __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 ... </TASK>
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/3594aad97e7be2557ca9fa9c931b206b604028c8 URL:https://git.kernel.org/stable/c/3594aad97e7be2557ca9fa9c931b206b604028c8 MISC:https://git.kernel.org/stable/c/4b49d939b5a79117f939b77cc67efae2694d9799 URL:https://git.kernel.org/stable/c/4b49d939b5a79117f939b77cc67efae2694d9799 MISC:https://git.kernel.org/stable/c/60b4b5c1277fc491da9e1e7abab307bfa39c2db7 URL:https://git.kernel.org/stable/c/60b4b5c1277fc491da9e1e7abab307bfa39c2db7 MISC:https://git.kernel.org/stable/c/64455c8051c3aedc71abb7ec8d47c80301f99f00 URL:https://git.kernel.org/stable/c/64455c8051c3aedc71abb7ec8d47c80301f99f00 MISC:https://git.kernel.org/stable/c/a7c41830ffcd17b2177a95a9b99b270302090c35 URL:https://git.kernel.org/stable/c/a7c41830ffcd17b2177a95a9b99b270302090c35 MISC:https://git.kernel.org/stable/c/c84e125fff2615b4d9c259e762596134eddd2f27 URL:https://git.kernel.org/stable/c/c84e125fff2615b4d9c259e762596134eddd2f27
Assigning CNA
kernel.org
Date Record Created
20241229	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20241229)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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