Review reviewHigh

CVE-2025-40203

Linux

In the Linux kernel, the following vulnerability has been resolved: listmount: don't call path_put() under namespace semaphore Massage listmount() and make sure we don't call path_put() under the namespace semaphore. If we put the last reference we're fscked.

CVSS
7.8
EPSS
0.14%
3.59% percentile
CISA KEV
Not listed
Published
2025.11.13
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.14%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: listmount: don't call path_put() under namespace semaphore Massage listmount() and make sure we don't call path_put() under the namespace semaphore. If we put the last reference we're fscked.

Affected product and versions

Product
Linux
Affected versions
>= b4c2bea8ceaa50cd42a8f73667389d801a3ecf2d < 659874b7ee4976ad9ce476e07fd36bc67b3537f1, >= b4c2bea8ceaa50cd42a8f73667389d801a3ecf2d < 9c80da26fda2fdcaac7f92b5908875b3108830ff, >= b4c2bea8ceaa50cd42a8f73667389d801a3ecf2d < c1f86d0ac322c7e77f6f8dbd216c65d39358ffc0, >= 6.8
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux 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
Not available
CVE-2025-40203 — Linux | SECUFOCUS NOW