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CVE-2022-49316: NFSv4: Don't hold the layoutget locks across multiple RPC calls

• Severity: medium (CVSS 5.5 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: 2025-02-26 · updated 2026-06-17
• Weakness: CWE-667

Description

In the Linux kernel, the following vulnerability has been resolved: NFSv4: Don't hold the layoutget locks across multiple RPC calls When doing layoutget as part of the open() compound, we have to be careful to release the layout locks before we can call any further RPC calls, such as setattr(). The reason is that those calls could trigger a recall, which could deadlock.

Affected products

• Linux kernel: before 4.19.247; from 4.20 before 5.4.198; from 5.5 before 5.10.122; from 5.11 before 5.15.47; from 5.16 before 5.17.15; from 5.18 before 5.18.4 — fixed in 4.19.247, 5.10.122, 5.15.47, 5.17.15, 5.18.4, 5.4.198

How to fix

Upgrade to a fixed version: Linux kernel 4.19.247, 5.10.122, 5.15.47, 5.17.15. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/08d7a26d115cc7892668baa9750f64bd8baca29b
• https://git.kernel.org/stable/c/0ee5b9644f06b4d3cdcd9544f43f63312e425a4c
• https://git.kernel.org/stable/c/6949493884fe88500de4af182588e071cf1544ee
• https://git.kernel.org/stable/c/6b3fc1496e7227cd6a39a80bbfb7588ef7c7a010
• https://git.kernel.org/stable/c/a2b3be930e79cc5d9d829f158e31172b2043f0cd
• https://git.kernel.org/stable/c/d4c2a041ed3ba114502d5ed6ace5b1a48d637a8e
• https://git.kernel.org/stable/c/ea759ae0a9ae5acee677d722129710ac89cc59c1

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