CVE-2021-47624

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux5b7eb78486cd9ac58bfbd6d84ea0fe2d9fead03b < 4b22aa42bd4d2d630ef1854c139275c3532937cbaffected
LinuxLinux5b7eb78486cd9ac58bfbd6d84ea0fe2d9fead03b < 5f6024c05a2c0fdd180b29395aaf686d25af3a0faffected
LinuxLinux5b7eb78486cd9ac58bfbd6d84ea0fe2d9fead03b < 776d794f28c95051bc70405a7b1fa40115658a18affected
LinuxLinux5.14affected
LinuxLinux0 < 5.14unaffected
LinuxLinux5.15.24 <= 5.15.*unaffected
LinuxLinux5.16.10 <= 5.16.*unaffected
LinuxLinux5.17 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References