What’s Vulnerable › Vulnerabilities

CVE-2023-53381: NFSD: fix leaked reference count of nfsd4_ssc_umount_item

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-18 · updated 2026-08-04

Description

In the Linux kernel, the following vulnerability has been resolved: NFSD: fix leaked reference count of nfsd4_ssc_umount_item The reference count of nfsd4_ssc_umount_item is not decremented on error conditions. This prevents the laundromat from unmounting the vfsmount of the source file. This patch decrements the reference count of nfsd4_ssc_umount_item on error.

Affected products

• Linux kernel: from 5.14 before 5.15.154; from 5.16 before 6.1.16; from 6.2 before 6.2.3 — fixed in 5.15.154, 6.1.16, 6.2.3

How to fix

Upgrade to a fixed version: Linux kernel 5.15.154, 6.1.16, 6.2.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2da50149981d05955e51c28e982e9ac29bd73417
• https://git.kernel.org/stable/c/34e8f9ec4c9ac235f917747b23a200a5e0ec857b
• https://git.kernel.org/stable/c/6c3c05402547aaca3edb23327b50f01a881831b9
• https://git.kernel.org/stable/c/80a15dc4a0214b55ca42675bb0bb2a8d857eb1d0
• https://git.kernel.org/stable/c/9f0df37520a27ad99eaacf38418b3d2bb5023105

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