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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-21887
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-03-27 15:15:56 UTC
Updated2026-07-14 13:17:26 UTC
DescriptionIn 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>

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from ADP

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-416 | CWE-416 CWE-416 Use After Free

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 714ba10a6dd19752a349e59aa875f3288ccb59b9 f77618291836168eca99e89cd175256f928f5e64 git Not specified
CNA Linux Linux affected 62f29ca45f832e281fc14966ac25f6ff3bd121ca 4b49d939b5a79117f939b77cc67efae2694d9799 git Not specified
CNA Linux Linux affected e4f2a1feebb3f209a0fca82aa53507a5b8be4d53 a7c41830ffcd17b2177a95a9b99b270302090c35 git Not specified
CNA Linux Linux affected b07d5cc93e1b28df47a72c519d09d0a836043613 64455c8051c3aedc71abb7ec8d47c80301f99f00 git Not specified
CNA Linux Linux affected b07d5cc93e1b28df47a72c519d09d0a836043613 3594aad97e7be2557ca9fa9c931b206b604028c8 git Not specified
CNA Linux Linux affected b07d5cc93e1b28df47a72c519d09d0a836043613 60b4b5c1277fc491da9e1e7abab307bfa39c2db7 git Not specified
CNA Linux Linux affected b07d5cc93e1b28df47a72c519d09d0a836043613 c84e125fff2615b4d9c259e762596134eddd2f27 git Not specified
CNA Linux Linux affected 33ab4dd6202f359558a0a2678b94d1b9994c17e5 git Not specified
CNA Linux Linux affected 1ecdc55e5cd9f70f8d7513802971d4cffb9f77af git Not specified
CNA Linux Linux affected 5.10.188 5.10.247 semver Not specified
CNA Linux Linux affected 5.15.121 5.15.179 semver Not specified
CNA Linux Linux affected 6.1.39 6.1.130 semver Not specified
CNA Linux Linux affected 6.3.13 6.4 semver Not specified
CNA Linux Linux affected 6.4.4 6.5 semver Not specified
CNA Linux Linux affected 6.5 Not specified
CNA Linux Linux unaffected 6.5 semver Not specified
CNA Linux Linux unaffected 5.10.247 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.179 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.130 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.81 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.18 6.12.* semver Not specified
CNA Linux Linux unaffected 6.13.6 6.13.* semver Not specified
CNA Linux Linux unaffected 6.14 * original_commit_for_fix Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4b49d939b5a79117f939b77cc67efae2694d9799 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/60b4b5c1277fc491da9e1e7abab307bfa39c2db7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f77618291836168eca99e89cd175256f928f5e64 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c84e125fff2615b4d9c259e762596134eddd2f27 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-019113.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/64455c8051c3aedc71abb7ec8d47c80301f99f00 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a7c41830ffcd17b2177a95a9b99b270302090c35 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/05/msg00045.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/3594aad97e7be2557ca9fa9c931b206b604028c8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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