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Fencer Vulns
high 7.8

CVE-2025-38499 json

clone_private_mnt(): make sure that caller has CAP_SYS_ADMIN in the right userns

published 2025-08-11 14 mo ago modified 2026-10-15 24 d ago also EUVD-2025-24155

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 8%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

clone_private_mnt(): make sure that caller has CAP_SYS_ADMIN in the right userns

What we want is to verify there is that clone won't expose something hidden by a mount we wouldn't be able to undo. "Wouldn't be able to undo" may be a result of MNT_LOCKED on a child, but it may also come from lacking admin rights in the userns of the namespace mount belongs to.

clone_private_mnt() checks the former, but not the latter.

There's a number of rather confusing CAP_SYS_ADMIN checks in various userns during the mount, especially with the new mount API; they serve different purposes and in case of clone_private_mnt() they usually, but not always end up covering the missing check mentioned above.

Patch / fix

  • Linux Linux 4.5, 4.10, 4.15, 4.20, 5.5, 5.11, 5.14, 5.15.190, 6.1.147, 6.6.100, 6.12.40, 6.15.3, 6.16
  • linux Debian 12 6.1.147-1
  • linux Debian 13 6.12.41-1
  • linux Debian 14 6.16.3-1

debian advisories DEBIAN-CVE-2025-38499

  • linux Ubuntu 22.04 LTS 5.15.0-163.173
  • linux Ubuntu 24.04 LTS 6.8.0-100.100
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1097.104
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1046.49
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1097.106
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1047.50
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1093.99
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1043.48

ubuntu advisories UBUNTU-CVE-2025-38499

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kpatch-patch-5_14_0-611_9_1 RHEL 9 1-1.el9_7
  • kernel RHEL 10.1 6.12.0-124.21.1.el10_1
  • rv RHEL 10.1 6.12.0-124.21.1.el10_1
  • perf RHEL 10.1 6.12.0-124.21.1.el10_1
  • rtla RHEL 10.1 6.12.0-124.21.1.el10_1
  • libperf RHEL 10.1 6.12.0-124.21.1.el10_1
  • kernel-rt RHEL 10.1 6.12.0-124.21.1.el10_1
  • kernel-64k RHEL 10.1 6.12.0-124.21.1.el10_1

red hat advisories RHSA-2025:23730RHSA-2025:23279RHSA-2025:23250RHSA-2025:23241

  • kernel-rt Linux Micro 6.2 6.12.0-160000.6.1
  • kernel-64kb SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1
  • kernel-source SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1
  • kernel-default SLES 16.0, SLE High Availability Extension 16.0, Linux Micro 6.2 +1 more 6.12.0-160000.6.1
  • kernel-default-base SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1.160000.2.4
  • kernel-syms SLES 16.0, Linux Micro Extras 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1
  • kernel-obs-qa SLES for SAP applications 16.0, SLES 16.0 6.12.0-160000.6.1
  • kernel-kvmsmall SLES for SAP applications 16.0, SLES 16.0 6.12.0-160000.6.1

suse advisories SUSE-SU-2025:21074-1SUSE-SU-2025:21139-1SUSE-SU-2026:20560-1SUSE-SU-2025:21179-1SUSE-SU-2025:4123-1SUSE-SU-2025:20891-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.6.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-kvmsmall openSUSE Leap 16.0 6.12.0-160000.6.1

opensuse advisories openSUSE-SU-2025:20081-1

  • kernel AlmaLinux 9 5.14.0-611.16.1.el9_7
  • rv AlmaLinux 9 5.14.0-611.16.1.el9_7
  • perf AlmaLinux 9 5.14.0-611.16.1.el9_7
  • rtla AlmaLinux 9 5.14.0-611.16.1.el9_7
  • libperf AlmaLinux 9 5.14.0-611.16.1.el9_7
  • kernel-rt AlmaLinux 9 5.14.0-611.16.1.el9_7
  • kernel-64k AlmaLinux 9 5.14.0-611.16.1.el9_7
  • kernel-core AlmaLinux 9 5.14.0-611.16.1.el9_7

almalinux advisories ALSA-2025:23241ALSA-2025:23279

  • kernel Rocky Linux 10 6.12.0-124.21.1.el10_1
  • kernel Rocky Linux 9 5.14.0-611.16.1.el9_7

rocky linux advisories RLSA-2025:23279RLSA-2025:23241

  • kernel Azure Linux 3.0 6.6.104.2-1
  • kernel CBL-Mariner 2.0 5.15.200.1-1

azure linux advisories AZL-66174AZL-73470

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-38499 updated cvss 7.8

kernel: clone_private_mnt(): make sure that caller has CAP_SYS_ADMIN in the right userns

  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-611.16.1.el9_7, perf 5.14.0-611.16.1.el9_7, rtla 5.14.0-611.16.1.el9_7, python3-perf 5.14.0-611.16.1.el9_7, kernel-devel-matched 5.14.0-611.16.1.el9_7, kernel-64k-devel-matched 5.14.0-611.16.1.el9_7, +7 more
    fixed: vendor fix RHSA-2025:23241
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-124.21.1.el10_1, perf 6.12.0-124.21.1.el10_1, rtla 6.12.0-124.21.1.el10_1, python3-perf 6.12.0-124.21.1.el10_1, kernel-devel-matched 6.12.0-124.21.1.el10_1, kernel-64k-devel-matched 6.12.0-124.21.1.el10_1, +7 more
    fixed: vendor fix RHSA-2025:23279
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.50.1.el10_0, perf 6.12.0-55.50.1.el10_0, rtla 6.12.0-55.50.1.el10_0, python3-perf 6.12.0-55.50.1.el10_0, kernel-devel-matched 6.12.0-55.50.1.el10_0, kernel-64k-devel-matched 6.12.0-55.50.1.el10_0, +7 more
    fixed: vendor fix RHSA-2025:23250
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-611.16.1.el9_7, kernel-64k 5.14.0-611.16.1.el9_7, kernel-core 5.14.0-611.16.1.el9_7, kernel-tools 5.14.0-611.16.1.el9_7, kernel-modules 5.14.0-611.16.1.el9_7, kernel-64k-core 5.14.0-611.16.1.el9_7, +28 more
    fixed: vendor fix RHSA-2025:23241
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-124.21.1.el10_1, kernel-64k 6.12.0-124.21.1.el10_1, kernel-core 6.12.0-124.21.1.el10_1, kernel-tools 6.12.0-124.21.1.el10_1, kernel-modules 6.12.0-124.21.1.el10_1, kernel-64k-core 6.12.0-124.21.1.el10_1, +28 more
    fixed: vendor fix RHSA-2025:23279
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.50.1.el10_0, kernel-64k 6.12.0-55.50.1.el10_0, kernel-core 6.12.0-55.50.1.el10_0, kernel-tools 6.12.0-55.50.1.el10_0, kernel-modules 6.12.0-55.50.1.el10_0, kernel-64k-core 6.12.0-55.50.1.el10_0, +27 more
    fixed: vendor fix RHSA-2025:23250
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-611.16.1.el9_7, kernel-debuginfo-common-s390x 5.14.0-611.16.1.el9_7, kernel-debuginfo-common-x86_64 5.14.0-611.16.1.el9_7, kernel-debuginfo-common-aarch64 5.14.0-611.16.1.el9_7, kernel-debuginfo-common-ppc64le 5.14.0-611.16.1.el9_7
    fixed: vendor fix RHSA-2025:23241
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-124.21.1.el10_1, kernel-debuginfo-common-s390x 6.12.0-124.21.1.el10_1, kernel-debuginfo-common-x86_64 6.12.0-124.21.1.el10_1, kernel-debuginfo-common-aarch64 6.12.0-124.21.1.el10_1, kernel-debuginfo-common-ppc64le 6.12.0-124.21.1.el10_1
    fixed: vendor fix RHSA-2025:23279
show 10 more
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.50.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.50.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.50.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.50.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.50.1.el10_0
    fixed: vendor fix RHSA-2025:23250
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-611.16.1.el9_7, kernel-rt-64k 5.14.0-611.16.1.el9_7, kernel-rt-core 5.14.0-611.16.1.el9_7, kernel-rt-modules 5.14.0-611.16.1.el9_7, kernel-rt-64k-core 5.14.0-611.16.1.el9_7, kernel-rt-debug-core 5.14.0-611.16.1.el9_7, +14 more
    fixed: vendor fix RHSA-2025:23241
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-124.21.1.el10_1, kernel-rt-64k 6.12.0-124.21.1.el10_1, kernel-rt-core 6.12.0-124.21.1.el10_1, kernel-rt-modules 6.12.0-124.21.1.el10_1, kernel-rt-64k-core 6.12.0-124.21.1.el10_1, kernel-rt-debug-core 6.12.0-124.21.1.el10_1, +14 more
    fixed: vendor fix RHSA-2025:23279
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.50.1.el10_0, kernel-rt-64k 6.12.0-55.50.1.el10_0, kernel-rt-core 6.12.0-55.50.1.el10_0, kernel-rt-modules 6.12.0-55.50.1.el10_0, kernel-rt-64k-core 6.12.0-55.50.1.el10_0, kernel-rt-debug-core 6.12.0-55.50.1.el10_0, +14 more
    fixed: vendor fix RHSA-2025:23250
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-611.16.1.el9_7, kernel-rt-core 5.14.0-611.16.1.el9_7, kernel-rt-modules 5.14.0-611.16.1.el9_7, kernel-rt-debug-core 5.14.0-611.16.1.el9_7, kernel-rt-modules-core 5.14.0-611.16.1.el9_7, kernel-rt-debug-modules 5.14.0-611.16.1.el9_7, +4 more
    fixed: vendor fix RHSA-2025:23241
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-124.21.1.el10_1, kernel-rt-core 6.12.0-124.21.1.el10_1, kernel-rt-modules 6.12.0-124.21.1.el10_1, kernel-rt-debug-core 6.12.0-124.21.1.el10_1, kernel-rt-modules-core 6.12.0-124.21.1.el10_1, kernel-rt-debug-modules 6.12.0-124.21.1.el10_1, +4 more
    fixed: vendor fix RHSA-2025:23279
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt 6.12.0-55.50.1.el10_0, kernel-rt-kvm 6.12.0-55.50.1.el10_0, kernel-rt-core 6.12.0-55.50.1.el10_0, kernel-rt-modules 6.12.0-55.50.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.50.1.el10_0, kernel-rt-debug-core 6.12.0-55.50.1.el10_0, +6 more
    fixed: vendor fix RHSA-2025:23250
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    not affected: vulnerable code not present
  • Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more
    not affected: component not present
  • Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-25-162-05 updated cvss 5.5

Siemens SIMATIC S7-1500 CPU family

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.5 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.5 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.5
    affected: mitigation, no fix available

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
24 d ago

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Linux Linux
  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

Classification

Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.