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CVE-2024-42096 is an unsafe stack-reading vulnerability in the Linux kernel's x86 profile_pc() function, used for timer-based profiling. To attribute time spent in spinlocks to their callers, the function reads one or two words directly from the stack pointer and attempts to distinguish EFLAGS values from return program counters. This logic assumes that lock functions have no stack frame or only an EFLAGS copy produced by PUSHF. Lock debugging and other instrumentation can invalidate that assumption, causing invalid stack accesses and Kernel Address Sanitizer (KASAN) warnings. The fix removes the stack-layout-dependent profiling logic.
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A Linux kernel x86 timer-based profiling flaw in profile_pc() relies on invalid stack-layout assumptions when attributing time spent in spinlocks to their callers. The fix removes the problematic stack-inspection code. The advisory rates the vulnerability Medium, with a CVSS v3 score of 5.5 reflecting local access, low privileges, and high availability impact.
Linux kernel vulnerability covered by the security update.
A Linux kernel x86 vulnerability involving profile_pc() stack handling.
A Linux kernel x86 flaw in timer-based profiling's profile_pc() routine. The routine made unsafe assumptions about spinlock-related stack layout and read words directly from the stack, producing KASAN warnings when debugging or other stack frames invalidated those assumptions. The vulnerable logic was removed.
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