CWE
416
Advisory Published
CVE Published
Updated

CVE-2018-16884: Use After Free

First published: Tue Nov 27 2018(Updated: )

A flaw was found in the Linux kernel in the NFS41+ subsystem. NFS41+ shares mounted in different network namespaces at the same time can make bc_svc_process() use wrong back-channel id and cause a use-after-free. Thus a malicious container user can cause a host kernel memory corruption and a system panic. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely. References: <a href="https://seclists.org/oss-sec/2018/q4/267">https://seclists.org/oss-sec/2018/q4/267</a> A proposed patchset: <a href="https://patchwork.kernel.org/cover/10733767/">https://patchwork.kernel.org/cover/10733767/</a> <a href="https://patchwork.kernel.org/patch/10733769/">https://patchwork.kernel.org/patch/10733769/</a>

Credit: secalert@redhat.com secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/kernel-rt<0:3.10.0-957.27.2.rt56.940.el7
0:3.10.0-957.27.2.rt56.940.el7
redhat/kernel<0:3.10.0-957.27.2.el7
0:3.10.0-957.27.2.el7
redhat/kernel-alt<0:4.14.0-115.26.1.el7a
0:4.14.0-115.26.1.el7a
redhat/kernel<0:3.10.0-693.58.1.el7
0:3.10.0-693.58.1.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
redhat/kernel<0:4.18.0-80.15.1.el8_0
0:4.18.0-80.15.1.el8_0
redhat/kernel-rt<1:3.10.0-693.58.1.rt56.652.el6
1:3.10.0-693.58.1.rt56.652.el6
Linux Kernel>=3.7<3.16.65
Linux Kernel>=3.17<3.18.133
Linux Kernel>=3.19<4.4.171
Linux Kernel>=4.5<4.9.151
Linux Kernel>=4.10<4.14.94
Linux Kernel>=4.15<4.19.16
Linux Kernel>=4.20<4.20.3
Red Hat Enterprise Linux=7.0
Red Hat Enterprise MRG=2.0
Debian GNU/Linux=8.0
Ubuntu Linux=14.04
Ubuntu Linux=16.04
debian/linux
5.10.223-1
5.10.226-1
6.1.123-1
6.1.128-1
6.12.12-1
6.12.13-1

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2018-16884?

    CVE-2018-16884 is considered a critical vulnerability due to its potential to cause kernel memory corruption.

  • How do I fix CVE-2018-16884?

    To fix CVE-2018-16884, update the kernel to one of the patched versions specified by your distribution, such as kernel-rt or kernel for Red Hat and Debian.

  • What systems are affected by CVE-2018-16884?

    CVE-2018-16884 affects various Linux kernel versions, particularly those in Red Hat and Debian distributions.

  • What kind of exploit is associated with CVE-2018-16884?

    CVE-2018-16884 can be exploited by a malicious container user to cause a use-after-free condition and potential kernel memory corruption.

  • Is my kernel version safe from CVE-2018-16884?

    To determine if your kernel version is safe from CVE-2018-16884, compare it with the known vulnerable versions listed in security advisories.

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