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CVE-2023-52598 is a race condition in the Linux kernel s390 ptrace implementation when a tracer uses ptrace to modify a traced process's floating-point control (FPC) register. During validation, the kernel temporarily loads the requested FPC value through test_fp_ctl(). If an interrupt occurs during that interval and interrupt-context code uses floating-point or vector registers, save_fpu_regs() can save the temporary value as the tracer's user-space FPU state. Although test_fp_ctl() restores the original FPC value, that restoration can be discarded on return to user space, causing the tracing process to resume with the FPC value intended for the traced process. The fix saves the FPU register contents with save_fpu_regs() before invoking test_fp_ctl().
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Linux kernel s390 ptrace flaw involving incorrect handling when setting the floating-point-control (FPC) register.
Linux kernel s390 ptrace floating-point-control register handling flaw.
Linux kernel s390 ptrace floating-point-control register handling vulnerability.
Linux kernel s390 ptrace vulnerability in floating-point control-register setting.
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YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
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