CVE-2025-38306

Kernel hang or crash via unlocked mount traversal

Published Jul 10, 2025 · Updated Aug 5, 2026

Race condition in Linux 6.11 through 6.15.2 allows local users to crash or hang the kernel through concurrent mount operations. The may_decode_fh() path calls has_locked_children() without mount_lock while another thread can mutate the mount list, permitting stale mount traversal, an oops, or an in-kernel infinite loop. An unprivileged local user can reach the race through a private user and mount namespace, while a process running as root inside an ordinary container also satisfies the required namespace capability.

CVSS severity7.8
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux 6.11 through 6.15.2 allows local users to crash or hang the kernel through concurrent mount operations. The may_decode_fh() path calls has_locked_children() without mount_lock while another thread can mutate the mount list, permitting stale mount traversal, an oops, or an in-kernel infinite loop. An unprivileged local user can reach the race through a private user and mount namespace, while a process running as root inside an ordinary container also satisfies the required namespace capability.

The record

CVE
CVE-2025-38306
Published
Jul 10, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.11
  2. Affected versionversion=620c266f394932e5decc4b34683a75dfc59dc2f4 <1f282cdc1d219c4a557f7009e81bc792820d9d9a
  3. Affected versionversion=620c266f394932e5decc4b34683a75dfc59dc2f4 <287c7d34eedd37af1272dfb3b6e8656f4f026424
  4. Affected versionversion=620c266f394932e5decc4b34683a75dfc59dc2f4 <6482c3dccbfb8d20e2856ce67c75856859930b3f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.11; version=620c266f394932e5decc4b34683a75dfc59dc2f4 <1f282cdc1d219c4a557f7009e81bc792820d9d9a; version=620c266f394932e5decc4b34683a75dfc59dc2f4 <287c7d34eedd37af1272dfb3b6e8656f4f026424; version=620c266f394932e5decc4b34683a75dfc59dc2f4 <6482c3dccbfb8d20e2856ce67c75856859930b3f

Published CVSS scores

7.8Linux kernel CVE teamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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