CVE-2022-48780: net/smc: Avoid overwriting the copies of clcsock callback functions

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: 2024-07-16 · updated 2026-06-17
Weakness: CWE-835

Description

In the Linux kernel, the following vulnerability has been resolved: net/smc: Avoid overwriting the copies of clcsock callback functions The callback functions of clcsock will be saved and replaced during the fallback. But if the fallback happens more than once, then the copies of these callback functions will be overwritten incorrectly, resulting in a loop call issue: clcsk->sk_error_report |- smc_fback_error_report() <------------------------------| |- smc_fback_forward_wakeup() | (loop) |- clcsock_callback() (incorrectly overwritten) | |- smc->clcsk_error_report() ------------------| So this patch fixes the issue by saving these function pointers only once in the fallback and avoiding overwriting.

Affected products

Linux kernel: from 5.15.22 before 5.15.25; from 5.16.8 before 5.16.11; 5.17-rc3, 5.17-rc4 — fixed in 5.15.25, 5.16.11

How to fix

Upgrade to a fixed version: Linux kernel 5.15.25, 5.16.11. Check the vendor advisory for mitigations.

References

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