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Vulnerability of Linux kernel: use after free via __blk_add_trace

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via __blk_add_trace() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Vulnerable systems: Linux, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this threat: 2/4.
Creation date: 13/12/2019.
Références of this weakness: 205711, CERTFR-2020-AVI-241, CERTFR-2020-AVI-242, CERTFR-2020-AVI-243, CERTFR-2020-AVI-252, CERTFR-2020-AVI-253, CERTFR-2020-AVI-256, CERTFR-2020-AVI-260, CERTFR-2020-AVI-281, CERTFR-2020-AVI-306, CERTFR-2020-AVI-311, CERTFR-2020-AVI-318, CERTFR-2020-AVI-320, CVE-2019-19768, openSUSE-SU-2020:0388-1, RHSA-2020:1567-01, RHSA-2020:1769-01, RHSA-2020:1966-01, RHSA-2020:2082-01, RHSA-2020:2085-01, RHSA-2020:2104-01, RHSA-2020:2199-01, RHSA-2020:2203-01, RHSA-2020:2214-01, RHSA-2020:2242-01, RHSA-2020:2277-01, RHSA-2020:2285-01, RHSA-2020:2289-01, RHSA-2020:2291-01, SUSE-SU-2020:0836-1, SUSE-SU-2020:1084-1, SUSE-SU-2020:1085-1, SUSE-SU-2020:1087-1, SUSE-SU-2020:1118-1, SUSE-SU-2020:1119-1, SUSE-SU-2020:1123-1, SUSE-SU-2020:1141-1, SUSE-SU-2020:1142-1, SUSE-SU-2020:1255-1, SUSE-SU-2020:14354-1, USN-4342-1, USN-4344-1, USN-4345-1, USN-4346-1, VIGILANCE-VUL-31148.

Description of the vulnerability 

An attacker can force the usage of a freed memory area via __blk_add_trace() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
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This cybersecurity weakness impacts software or systems such as Linux, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this security vulnerability is medium.

The trust level is of type confirmed by the editor, with an origin of user shell.

An attacker with a expert ability can exploit this vulnerability bulletin.

Solutions for this threat 

Linux kernel: version 5.5.8.
The version 5.5.8 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.24.
The version 5.4.24 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.119.
The version 4.19.119 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.19.119.tar.xz

Linux kernel: version 4.14.181.
The version 4.14.181 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.14.181.tar.xz

Linux kernel: version 4.9.224.
The version 4.9.224 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.9.224.tar.xz

Linux kernel: version 4.4.224.
The version 4.4.224 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.4.224.tar.xz

Linux kernel: version 3.16.83.
The version 3.16.83 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/linux-3.16.83.tar.xz

Linux kernel: patch for __blk_add_trace.
A patch is indicated in information sources.

openSUSE Leap 15.1: new kernel packages.
New packages are available:
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.44.1

RHEL 6: new kernel-rt packages.
New packages are available:
  RHEL 6.0-6.10: kernel-rt 3.10.0-693.67.1.rt56.665.el6rt

RHEL 7.6: new kernel packages.
New packages are available:
  RHEL 7.0-7.8: kernel 3.10.0-957.54.1.el7

RHEL 7, 8: new kpatch-patch packages (19/05/2020).
New packages are available:
  RHEL 7.0-7.8: kpatch-patch 3_10_0-957_48_1-1-3.el7
  RHEL 8.0-8.1: kpatch-patch 4_18_0-147-1-13.el8

RHEL 7: new kernel-alt packages.
New packages are available:
  RHEL 7.0-7.8: kernel-alt 4.14.0-115.21.2.el7a

RHEL 7: new kernel packages.
New packages are available:
  RHEL 7.0-7.8: kernel 3.10.0-1127.8.2.el7
  RHEL 7.2: kernel 3.10.0-327.88.1.el7
  RHEL 7.3: kernel 3.10.0-514.76.1.el7
  RHEL 7.4: kernel 3.10.0-693.67.1.el7

RHEL 7: new kernel-rt packages.
New packages are available:
  RHEL 7.0-7.8: kernel-rt 3.10.0-1127.8.2.rt56.1103.el7

RHEL 8.1: new kernel packages.
New packages are available:
  RHEL 8.1: kernel 4.18.0-147.13.2.el8_1

RHEL 8: new kernel packages.
New packages are available:
  RHEL 8.0-8.1: kernel 4.18.0-193.el8

RHEL 8: new kernel-rt packages.
New packages are available:
  RHEL 8.0-8.1: kernel-rt 4.18.0-193.rt13.51.el8

SUSE LE 11 SP4: new kernel packages.
New packages are available:
  SUSE LE 11 SP4: kernel 3.0.101-108.111.1

SUSE LE 12 SP2: new kernel packages.
New packages are available:
  SUSE LE 12 SP2: kernel-default 4.4.121-92.129.1

SUSE LE 12 SP4: new kernel-default-kgraft packages.
New packages are available:
  SUSE LE 12 SP4: kernel-default-kgraft 4.12.14-95.51.1

SUSE LE 12 SP4: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP4: kernel-rt 4.12.14-8.18.1

SUSE LE 12 SP4, SP5: new kernel-azure packages.
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.13.1
  SUSE LE 12 SP4: kernel-azure 4.12.14-6.40.1

SUSE LE 12 SP5: new kernel-default-kgraft packages.
New packages are available:
  SUSE LE 12 SP5: kernel-default-kgraft 4.12.14-122.20.1

SUSE LE 12 SP5: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.8.1

SUSE LE 15 SP1: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP1: kernel-azure 4.12.14-8.30.1

SUSE LE 15 SP1: new kernel packages (01/04/2020).
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.37.1

SUSE LE 15 SP1: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.23.1

Ubuntu 18.04 LTS: new linux-image-5.0.0 packages.
New packages are available, as indicated in information sources.

Ubuntu: new linux-image-4.15.0 packages (29/04/2020).
New packages are available, as indicated in information sources.

Ubuntu: new linux-image-4.4.0 packages.
New packages are available, as indicated in information sources.

Ubuntu: new linux-image-5.3.0 packages (29/04/2020).
New packages are available, as indicated in information sources.
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