CVE-2019-13233: Use After Free

Published Jul 4, 2019
·
Updated

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

Reference: https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.1.9 https://bugs.chromium.org/p/project-zero/issues/detail?id=1879

Upstream commit: https://github.com/torvalds/linux/commit/de9f869616dd95e95c00bdd6b0fcd3421e8a4323 https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=de9f869616dd95e95c00bdd6b0fcd3421e8a4323

Other sources

A vulnerability was found in the arch/x86/lib/insn-eval.c function in the Linux kernel. An attacker could corrupt the memory due to a flaw in use-after-free access to an LDT entry caused by a race condition between modifyldt() and a #BR exception for an MPX bounds violation.

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 modifyldt() and a #BR exception for an MPX bounds violation.

Linux Kernel is vulnerable to a denial of service, caused by a use-after-free flaw when a race between modifyldt() and #BR Exception occurs. By sending a specially-crafted request, a local attacker could exploit this vulnerability to cause a denial of service condition.

— IBM

Affected Software

9 affected componentsFixes available
redhat/kernel-rt<0:3.10.0-1127.rt56.1093.el7
0:3.10.0-1127.rt56.1093.el7
redhat/kernel<0:3.10.0-1127.el7
0:3.10.0-1127.el7
redhat/kernel<0:3.10.0-957.56.1.el7
0:3.10.0-957.56.1.el7
redhat/kernel<0:3.10.0-1062.26.1.el7
0:3.10.0-1062.26.1.el7
redhat/kernel-rt<0:4.18.0-147.rt24.93.el8
0:4.18.0-147.rt24.93.el8
redhat/kernel<0:4.18.0-147.el8
0:4.18.0-147.el8
IBM Data Risk Manager<=2.0.6
Linux Linux kernel<5.1.9
debian/linux
5.10.223-15.10.259-16.1.176-16.1.177-16.12.94-16.12.96-17.1.3-17.1.4-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-1127.rt56.1093.el7
  2. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-1127.el7
  3. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-957.56.1.el7
  4. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-1062.26.1.el7
  5. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-147.rt24.93.el8
  6. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-147.el8
  7. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 5.10.223-1Fixed in 5.10.259-1Fixed in 6.1.176-1Fixed in 6.1.177-1Fixed in 6.12.94-1Fixed in 6.12.96-1Fixed in 7.1.3-1Fixed in 7.1.4-1
  8. Upgrade

    Upgrade linux/kernel to a version that resolves this vulnerability.

    Fixed in 5.1.9
  9. Upgrade

    Upgrade linux/kernel to a version that resolves this vulnerability.

    Patch de9f869616dd95e95c00bdd6b0fcd3421e8a4323

Event History

Jul 4, 2019
CVE Published
12:00 AM
CVE Published
via MITRE·12:27 PM
Data Sourced
via MITRE·12:27 PM
Description
Data Sourced
via NVD·01:15 PM
RemedyDescriptionSeverityWeaknessAffected Software
Jul 8, 2019
Data Sourced
via Red Hat·06:15 AM
DescriptionSeverityAffected Software
Apr 11, 2026
Data Sourced
via Launchpad·08:57 AM
Description
Jul 5, 2026
Data Sourced
via Ubuntu·10:37 AM
RemedyDescriptionSeverityAffected Software
Jul 25, 2026
Data Sourced
via Debian·10:59 AM
DescriptionAffected Software

Parent advisories

This vulnerability appears in the following advisories.

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Frequently Asked Questions

1

What is the severity of CVE-2019-13233?

CVE-2019-13233 has a severity rating of medium due to its potential for causing a use-after-free condition.

2

How do I fix CVE-2019-13233?

To fix CVE-2019-13233, update to the recommended kernel versions provided by your distribution, such as kernel-rt and kernel packages from Red Hat.

3

Which versions of the Linux kernel are affected by CVE-2019-13233?

CVE-2019-13233 affects Linux kernel versions prior to 5.1.9.

4

Is CVE-2019-13233 specific to Red Hat or does it affect other distributions?

While CVE-2019-13233 is prominently noted in Red Hat environments, other Linux distributions that use affected kernel versions could also be vulnerable.

5

What type of vulnerability is CVE-2019-13233?

CVE-2019-13233 is a use-after-free vulnerability caused by a race condition in the Linux kernel.

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