What’s Vulnerable › Vulnerabilities

CVE-2021-47624: net/sunrpc: fix reference count leaks in rpc_sysfs_xprt_state_change

• Severity: high (CVSS 7.1 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: 2024-07-16 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: net/sunrpc: fix reference count leaks in rpc_sysfs_xprt_state_change The refcount leak issues take place in an error handling path. When the 3rd argument buf doesn't match with "offline", "online" or "remove", the function simply returns -EINVAL and forgets to decrease the reference count of a rpc_xprt object and a rpc_xprt_switch object increased by rpc_sysfs_xprt_kobj_get_xprt() and rpc_sysfs_xprt_kobj_get_xprt_switch(), causing reference count leaks of both unused objects. Fix this issue by jumping to the error handling path labelled with out_put when buf matches none of "offline", "online" or "remove".

Affected products

• Linux kernel: before 5.15.24; from 5.16 before 5.16.10 — fixed in 5.15.24, 5.16.10

How to fix

Upgrade to a fixed version: Linux kernel 5.15.24, 5.16.10. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/4b22aa42bd4d2d630ef1854c139275c3532937cb
• https://git.kernel.org/stable/c/5f6024c05a2c0fdd180b29395aaf686d25af3a0f
• https://git.kernel.org/stable/c/776d794f28c95051bc70405a7b1fa40115658a18
• https://git.kernel.org/stable/c/4b22aa42bd4d2d630ef1854c139275c3532937cb
• https://git.kernel.org/stable/c/5f6024c05a2c0fdd180b29395aaf686d25af3a0f
• https://git.kernel.org/stable/c/776d794f28c95051bc70405a7b1fa40115658a18

Get alerted when CVE-2021-47624 or the next vulnerability affects your stack