CVE-2019-13233

Severity: high (CVSS 7.0 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2019-07-04 · updated 2026-06-17
Weakness: CWE-362

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.

Affected products

Linux kernel: before 5.1.9 — fixed in 5.1.9

How to fix

Upgrade to a fixed version: Linux kernel 5.1.9. Check the vendor advisory for mitigations.

References

http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00025.html
http://packetstormsecurity.com/files/154408/Kernel-Live-Patch-Security-Notice-LSN-0055-1.html
https://access.redhat.com/errata/RHSA-2019:3309
https://access.redhat.com/errata/RHSA-2019:3517
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://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=de9f869616dd95e95c00bdd6b0fcd3421e8a4323
https://github.com/torvalds/linux/commit/de9f869616dd95e95c00bdd6b0fcd3421e8a4323
https://seclists.org/bugtraq/2019/Aug/13
https://security.netapp.com/advisory/ntap-20190806-0001/
https://support.f5.com/csp/article/K13331647?utm_source=f5support&amp%3Butm_medium=RSS
https://usn.ubuntu.com/4093-1/

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