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Review reviewHigh

CVE-2025-21887

Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP

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_st...

CVSS
7.8
EPSS
0.19%
9.45% percentile
CISA KEV
Not listed
Published
2025.03.28
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.19%
Technical severityCVSS 7.8

Vulnerability overview

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_st...

Affected product and versions

Product
Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
Affected versions
>= 714ba10a6dd19752a349e59aa875f3288ccb59b9 < f77618291836168eca99e89cd175256f928f5e64, >= 62f29ca45f832e281fc14966ac25f6ff3bd121ca < 4b49d939b5a79117f939b77cc67efae2694d9799, >= e4f2a1feebb3f209a0fca82aa53507a5b8be4d53 < a7c41830ffcd17b2177a95a9b99b270302090c35, >= b07d5cc93e1b28df47a72c519d09d0a836043613 < 64455c8051c3aedc71abb7ec8d47c80301f99f00, >= b07d5cc93e1b28df47a72c519d09d0a836043613 < 3594aad97e7be2557ca9fa9c931b206b604028c8, >= b07d5cc93e1b28df47a72c519d09d0a836043613 < 60b4b5c1277fc491da9e1e7abab307bfa39c2db7, >= b07d5cc93e1b28df47a72c519d09d0a836043613 < c84e125fff2615b4d9c259e762596134eddd2f27, >= 33ab4dd6202f359558a0a2678b94d1b9994c17e5, >= 1ecdc55e5cd9f70f8d7513802971d4cffb9f77af, >= 5.10.188 < 5.10.247, >= 5.15.121 < 5.15.179, >= 6.1.39 < 6.1.130, >= 6.3.13 < 6.4, >= 6.4.4 < 6.5, >= 6.5, >= V3.1.6, >= 5.10.188 < 5.11, >= 6.4.4 < 6.6.81, >= 6.7 < 6.12.18, >= 6.13 < 6.13.6
Fixed versions
5.11, 5.15.179, 6.1.130, 6.4, 6.6.81, 6.12.18, 6.13.6

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416