Security readout for executives and security teams
A flaw in older Cyrix CPUs running Linux lets a logged-in user freeze the machine. It requires local access and only affects systems built around Cyrix processors, a chip family that has been out of mainstream use for well over two decades. Effectively negligible in modern estates. Cyrix ceased as an independent x86 vendor in the late 1990s, and no current enterprise Linux distribution targets Cyrix silicon. Only legacy hardware still in service could be exposed. Very low. This is a 1999-era hardware defect on a discontinued CPU line. Absent legacy Cyrix systems in the environment, no action is warranted beyond inventory confirmation and record-keeping. Mitigation focus: Inventory for any surviving Cyrix-based Linux hosts; retire or isolate them.; Restrict local shell access on legacy systems to trusted administrators only.; Consult current vendor and Linux distribution guidance before applying any workaround..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CVE-1999-0403 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
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CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
Products and packages named in the record
CWE details
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