CVE-2022-49905

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux194730a9beb52d2b030ea45e12d94868d4a0e6fd < 61defd6450a9ef4a1487090449999b0fd83518efaffected
LinuxLinux194730a9beb52d2b030ea45e12d94868d4a0e6fd < c97daf836f7caf81d3144b8cd2b2a51f9bc3bd09affected
LinuxLinux194730a9beb52d2b030ea45e12d94868d4a0e6fd < 62ff373da2534534c55debe6c724c7fe14adb97faffected
LinuxLinux5.14affected
LinuxLinux0 < 5.14unaffected
LinuxLinux5.15.78 <= 5.15.*unaffected
LinuxLinux6.0.8 <= 6.0.*unaffected
LinuxLinux6.1 <= *unaffected

Weaknesses

References