What’s Vulnerable › Vulnerabilities

CVE-2021-47167: NFS: Fix an Oopsable condition in __nfs_pageio_add_request()

• 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: 2024-03-25 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: NFS: Fix an Oopsable condition in __nfs_pageio_add_request() Ensure that nfs_pageio_error_cleanup() resets the mirror array contents, so that the structure reflects the fact that it is now empty. Also change the test in nfs_pageio_do_add_request() to be more robust by checking whether or not the list is empty rather than relying on the value of pg_count.

Affected products

• Linux kernel: from 4.0 before 5.4.124; from 5.5 before 5.10.42; from 5.11 before 5.12.9; 5.13-rc1, 5.13-rc2, 5.13-rc3 — fixed in 5.10.42, 5.12.9, 5.4.124

How to fix

Upgrade to a fixed version: Linux kernel 5.10.42, 5.12.9, 5.4.124. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/15ac6f14787649e8ebd75c142e2c5d2a243c8490
• https://git.kernel.org/stable/c/1fc5f4eb9d31268ac3ce152d74ad5501ad24ca3e
• https://git.kernel.org/stable/c/56517ab958b7c11030e626250c00b9b1a24b41eb
• https://git.kernel.org/stable/c/ee21cd3aa8548e0cbc8c67a80b62113aedd2d101
• https://git.kernel.org/stable/c/15ac6f14787649e8ebd75c142e2c5d2a243c8490
• https://git.kernel.org/stable/c/1fc5f4eb9d31268ac3ce152d74ad5501ad24ca3e
• https://git.kernel.org/stable/c/56517ab958b7c11030e626250c00b9b1a24b41eb
• https://git.kernel.org/stable/c/ee21cd3aa8548e0cbc8c67a80b62113aedd2d101

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