🛡️ AZL-59405 — kernel

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

CVE-2025-21887 affecting package kernel for versions less than 5.15.180.1-1

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>

Affected software

AZL-59405 is recorded against 1 package.

  • kernel (fixed in 5.15.180.1-1)

Timeline and source

Published on 27 March 2025 and last revised on 21 April 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Web)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2025-03-27
Updated 2026-08-12
Modified 2026-04-21
Fix URL N/A

Affected Packages

Software From version Fixed in
kernel — 5.15.180.1-1

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