CVE-2022-49549

Summary

In the Linux kernel, the following vulnerability has been resolved:

x86/MCE/AMD: Fix memory leak when threshold_create_bank() fails

In mce_threshold_create_device(), if threshold_create_bank() fails, the previously allocated threshold banks array @bp will be leaked because the call to mce_threshold_remove_device() will not free it.

This happens because mce_threshold_remove_device() fetches the pointer through the threshold_banks per-CPU variable but bp is written there only after the bank creation is successful, and not before, when threshold_create_bank() fails.

Add a helper which unwinds all the bank creation work previously done and pass into it the previously allocated threshold banks array for freeing.

[ bp: Massage. ]

Affected Software

VendorProductVersion RangeStatus
LinuxLinux6458de97fc15530b54477c4e2b70af653e8ac3d9 < b4acb8e7f1594607bc9017ef0aacb40b24a003d6affected
LinuxLinux6458de97fc15530b54477c4e2b70af653e8ac3d9 < cc0dd4456f9573bf8af9b4d8754433918e809e1eaffected
LinuxLinux6458de97fc15530b54477c4e2b70af653e8ac3d9 < 9708f1956eeb70c86943e0bc62fa3b0101b59616affected
LinuxLinux6458de97fc15530b54477c4e2b70af653e8ac3d9 < 396b8e7ab2a99ddac57d3522b3da5e58cb608d37affected
LinuxLinux6458de97fc15530b54477c4e2b70af653e8ac3d9 < e5f28623ceb103e13fc3d7bd45edf9818b227fd0affected
LinuxLinux5.8affected
LinuxLinux0 < 5.8unaffected
LinuxLinux5.10.121 <= 5.10.*unaffected
LinuxLinux5.15.46 <= 5.15.*unaffected
LinuxLinux5.17.14 <= 5.17.*unaffected
LinuxLinux5.18.3 <= 5.18.*unaffected
LinuxLinux5.19 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

References