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CVE-2022-49549: x86/MCE/AMD: Fix memory leak when threshold_create_bank() fails

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-02-26 · updated 2026-06-17
• Weakness: CWE-401

Description

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 products

• Linux kernel: from 5.8 before 5.10.121; from 5.11 before 5.15.46; from 5.16 before 5.17.14; from 5.18 before 5.18.3 — fixed in 5.10.121, 5.15.46, 5.17.14, 5.18.3

How to fix

Upgrade to a fixed version: Linux kernel 5.10.121, 5.15.46, 5.17.14, 5.18.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/396b8e7ab2a99ddac57d3522b3da5e58cb608d37
• https://git.kernel.org/stable/c/9708f1956eeb70c86943e0bc62fa3b0101b59616
• https://git.kernel.org/stable/c/b4acb8e7f1594607bc9017ef0aacb40b24a003d6
• https://git.kernel.org/stable/c/cc0dd4456f9573bf8af9b4d8754433918e809e1e
• https://git.kernel.org/stable/c/e5f28623ceb103e13fc3d7bd45edf9818b227fd0

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