high
7
CWE
416
Advisory Published
CVE Published
Updated

CVE-2019-11811: Use After Free

First published: Tue May 07 2019(Updated: )

An issue was discovered in the Linux kernel before 5.0.4. There is a use-after-free upon attempted read access to /proc/ioports after the ipmi_si module is removed, related to drivers/char/ipmi/ipmi_si_intf.c, drivers/char/ipmi/ipmi_si_mem_io.c, and drivers/char/ipmi/ipmi_si_port_io.c.

Credit: cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Linux Linux kernel>=4.18<4.19.31
Linux Linux kernel>=4.20<5.0.4
openSUSE Leap=15.1
Redhat Enterprise Linux=7.0
Redhat Enterprise Linux Aus=7.6
Redhat Enterprise Linux Desktop=7.0
Redhat Enterprise Linux Server=7.0
Redhat Enterprise Linux Server Aus=7.4
Redhat Enterprise Linux Server Tus=7.4
Redhat Enterprise Linux Server Tus=7.6
Redhat Enterprise Linux Workstation=7.0
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<0:3.10.0-693.61.1.el7
0:3.10.0-693.61.1.el7
redhat/kernel<0:3.10.0-862.46.1.el7
0:3.10.0-862.46.1.el7
redhat/kernel-rt<0:4.18.0-80.7.1.rt9.153.el8_0
0:4.18.0-80.7.1.rt9.153.el8_0
redhat/kernel<0:4.18.0-80.7.1.el8_0
0:4.18.0-80.7.1.el8_0
redhat/kernel-rt<1:3.10.0-693.61.1.rt56.656.el6
1:3.10.0-693.61.1.rt56.656.el6

Remedy

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=401e7e88d4ef80188ffa07095ac00456f901b8c4

Remedy

https://github.com/torvalds/linux/commit/401e7e88d4ef80188ffa07095ac00456f901b8c4

Remedy

A mitigation to this flaw would be to no longer use IPMI on affected hardware until the kernel has been updated. Existing systems that have IPMI kernel modules loaded will need to unload the "ipmi_si" kernel module and blacklist ( See https://access.redhat.com/solutions/41278 for a guide on how to blacklist modules). Take careful consideration that if unloading and blacklisting the module, this creates a one-time attack vector window for a local attacker.

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2019-11811?

    CVE-2019-11811 is a vulnerability in the Linux kernel that allows a use-after-free attack when attempting to read /proc/ioports after the ipmi_si module is removed.

  • What is the severity of CVE-2019-11811?

    CVE-2019-11811 has a severity level of high.

  • Which software versions are affected by CVE-2019-11811?

    The affected software versions include kernel-rt 3.10.0-957.27.2.rt56.940.el7, kernel 3.10.0-957.27.2.el7, kernel-alt 4.14.0-115.26.1.el7a, and more.

  • How can I fix CVE-2019-11811?

    To fix CVE-2019-11811, users should update their Linux kernel to a version that includes the necessary patch.

  • Where can I find more information about CVE-2019-11811?

    More information about CVE-2019-11811 can be found on the CVE and NVD websites, as well as Red Hat's Bugzilla and Errata pages.

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