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A vulnerability in the Linux kernel's s390 architecture ptrace implementation allowed corruption of the floating point control (fpc) register in the tracing process. When the fpc register of a traced process is modified via ptrace, the new value is validated by temporarily loading it into the fpc register. If an interrupt occurs during this window and floating point or vector registers are used in the interrupt context, the current fp/vx registers are saved as if they belong to user space. Although test_fp_ctl() attempts to restore the original fpc value, this restoration is discarded, resulting in the tracer process running with the incorrect fpc value intended for the tracee.
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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.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.