CVE-2022-49905: net/smc: Fix possible leaked pernet namespace in smc_init()

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: 2025-05-01 · updated 2026-10-15
Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: net/smc: Fix possible leaked pernet namespace in smc_init() In smc_init(), register_pernet_subsys(&smc_net_stat_ops) is called without any error handling. If it fails, registering of &smc_net_ops won't be reverted. And if smc_nl_init() fails, &smc_net_stat_ops itself won't be reverted. This leaves wild ops in subsystem linkedlist and when another module tries to call register_pernet_operations() it triggers page fault: BUG: unable to handle page fault for address: fffffbfff81b964c RIP: 0010:register_pernet_operations+0x1b9/0x5f0 Call Trace: <TASK> register_pernet_subsys+0x29/0x40 ebtables_init+0x58/0x1000 [ebtables] ...

Affected products

Linux kernel: from 5.14 before 5.15.78; from 5.16 before 6.0.8; 6.1-rc1, 6.1-rc2, 6.1-rc3 — fixed in 5.15.78, 6.0.8

How to fix

Upgrade to a fixed version: Linux kernel 5.15.78, 6.0.8. Check the vendor advisory for mitigations.

References

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