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CVE-2022-48670: peci: cpu: Fix use-after-free in adev_release()

• Severity: high (CVSS 7.8 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: 2024-05-03 · updated 2026-08-13
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: peci: cpu: Fix use-after-free in adev_release() When auxiliary_device_add() returns an error, auxiliary_device_uninit() is called, which causes refcount for device to be decremented and .release callback will be triggered. Because adev_release() re-calls auxiliary_device_uninit(), it will cause use-after-free: [ 1269.455172] WARNING: CPU: 0 PID: 14267 at lib/refcount.c:28 refcount_warn_saturate+0x110/0x15 [ 1269.464007] refcount_t: underflow; use-after-free.

Affected products

• Linux kernel: from 5.18 before 5.19.10; 6.0-rc1, 6.0-rc2, 6.0-rc3 — fixed in 5.19.10

How to fix

Upgrade to a fixed version: Linux kernel 5.19.10. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1c11289b34ab67ed080bbe0f1855c4938362d9cf
• https://git.kernel.org/stable/c/c87f1f99e26ea4ae08cabe753ae98e5626bdba89
• https://git.kernel.org/stable/c/1c11289b34ab67ed080bbe0f1855c4938362d9cf
• https://git.kernel.org/stable/c/c87f1f99e26ea4ae08cabe753ae98e5626bdba89

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