What’s Vulnerable › Vulnerabilities

CVE-2022-49704: 9p: fix fid refcount leak in v9fs_vfs_get_link

• 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: 2025-02-26 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: 9p: fix fid refcount leak in v9fs_vfs_get_link we check for protocol version later than required, after a fid has been obtained. Just move the version check earlier.

Affected products

• Linux kernel: from 5.11 before 5.15.51; from 5.16 before 5.18.8; 5.19-rc1, 5.19-rc2, 5.19-rc3 — fixed in 5.15.51, 5.18.8

How to fix

Upgrade to a fixed version: Linux kernel 5.15.51, 5.18.8. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/e5690f263208c5abce7451370b7786eb25b405eb
• https://git.kernel.org/stable/c/e7b6d622bd812013eb39c8f4cd65b7ee8ede1e02
• https://git.kernel.org/stable/c/f0126bcaee81dabc1926012126aa74caa03a4c6e

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