PT-2025-54096 · Linux · Linux Kernel
Published
2025-12-30
·
Updated
2026-03-24
·
CVE-2023-54267
None
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Name of the Vulnerable Software and Affected Versions
Linux kernel versions prior to 6.5.0-rc3
Description
The Linux kernel contains an issue in the powerpc/pseries subsystem related to the
lppaca shared proc() function. When DEBUG PREEMPT is enabled, accessing the lppaca pointer within this function can trigger a bug, specifically a preemption check in preemptible code. This occurs because the function takes a pointer to the lppaca, which is typically accessed through get lppaca(). The issue manifests as an error when accessing /proc/powerpc/lparcfg with DEBUG PREEMPT enabled. The fix involves reworking lppaca shared proc() to directly access the lppaca, bypassing the preemption checks.Recommendations
Update to Linux kernel version 6.5.0-rc3 or later.
Exploit
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Related Identifiers
Affected Products
Linux Kernel