7.8

CVE-2025-38499: clone_private_mnt(): make sure that caller has CAP_SYS_ADMIN in the right userns

Modified
AliasesRHSA-2025:23730UBUNTU-CVE-2025-38499DEBIAN-CVE-2025-38499
Published 11-08-2025Last modified 15-10-2026

Vulnerability summary

CVE-2025-38499 is a high (CVSS 7.8) vulnerability in debian debian_linux. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7.9% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.18%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 137 · Related 131
DLA-4328-1DSA-5973-1DSA-5975-1OPENSUSE-SU-2025:20081-1RHSA-2025:23241RHSA-2025:23250

Showing 100 of 137.

Timeline

  1. 11-08-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

6 scores · 5 sources · 2 versions

EPSS trend

Probability

0.18%

Chance of exploitation in the next 30 days

Percentile

8%

Versus all other CVEs

30-day change

Increase +0.03 pp

From 0.16% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu145 products
  • linuxAll versions (No fix recorded) | < 5.15.0-163.173 | < 6.8.0-100.100
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1097.104 | < 6.8.0-1046.49
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Redhat3 products
  • kpatch-patch-5_14_0-611_9_1< 0:1-1.el9_7
  • kpatch-patch-5_14_0-611_9_1-debuginfo< 0:1-1.el9_7
  • kpatch-patch-5_14_0-611_9_1-debugsource< 0:1-1.el9_7
Debian2 products
  • linux< 6.1.147-1 | < 6.12.41-1 | < 6.16.3-1
  • debian_linuxEOL11.0
Linux2 products
  • linux≥ 427215d85e8d1476da1a86b8d67aceb485eb3631, < 36fecd740de2d542d2091d65d36554ee2bcf9c65 | ≥ 427215d85e8d1476da1a86b8d67aceb485eb3631, < d717325b5ecf2a40daca85c61923e17f32306179 | ≥ 427215d85e8d1476da1a86b8d67aceb485eb3631, < dc6a664089f10eab0fb36b6e4f705022210191d2 | ≥ 427215d85e8d1476da1a86b8d67aceb485eb3631, < e77078e52fbf018ab986efb3c79065ab35025607 | ≥ 427215d85e8d1476da1a86b8d67aceb485eb3631, < 38628ae06e2a37770cd794802a3f1310cf9846e3 | ≥ 427215d85e8d1476da1a86b8d67aceb485eb3631, < c28f922c9dcee0e4876a2c095939d77fe7e15116 | c6e8810d25295acb40a7b69ed3962ff181919571 | e3eee87c846dc47f6d8eb6d85e7271f24122a279 | 517b875dfbf58f0c6c9e32dc90f5cf42d71a42ce | 963d85d630dabe75a3cfde44a006fec3304d07b8 | 812f39ed5b0b7f34868736de3055c92c7c4cf459 | 6a002d48a66076524f67098132538bef17e8445e | 41812f4b84484530057513478c6770590347dc30 | ≥ 4.4.281, < 4.5 | ≥ 4.9.280, < 4.10 | ≥ 4.14.244, < 4.15 | ≥ 4.19.204, < 4.20 | ≥ 5.4.141, < 5.5 | ≥ 5.10.59, < 5.11 | ≥ 5.13.11, < 5.14 | 5.14
  • linux_kernelEOL≥ 4.4.281, < 4.5 | ≥ 4.9.280, < 4.10 | ≥ 4.14.244, < 4.15 | ≥ 4.19.204, < 4.20 | ≥ 5.4.141, < 5.5 | ≥ 5.10.59, < 5.11 | ≥ 5.13.11, < 5.14 | ≥ 5.14.1, < 5.15.190 | ≥ 5.16, < 6.1.147 | ≥ 6.2, < 6.6.100 | ≥ 6.7, < 6.12.40 | ≥ 6.13, < 6.15.3 | 5.14 | 5.14:rc6 | 5.14:rc7

4 vendors · 152 products

References

51 links
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