What’s Vulnerable › Vulnerabilities

CVE-2025-40203: listmount: don't call path_put() under namespace semaphore

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-11-12 · updated 2026-10-19

Description

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 products

• Linux kernel: 6.8 — fixed in 6.18

How to fix

Upgrade to a fixed version: Linux kernel 6.18. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/659874b7ee4976ad9ce476e07fd36bc67b3537f1
• https://git.kernel.org/stable/c/9c80da26fda2fdcaac7f92b5908875b3108830ff
• https://git.kernel.org/stable/c/c1f86d0ac322c7e77f6f8dbd216c65d39358ffc0

Get alerted when CVE-2025-40203 or the next vulnerability affects your stack