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Vulnerability of Linux kernel: use after free via napi_gro_frags

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via napi_gro_frags() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Vulnerable products: Linux, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES.
Severity of this weakness: 2/4.
Creation date: 10/06/2020.
Références of this bulletin: CERTFR-2020-AVI-318, CERTFR-2020-AVI-376, CERTFR-2020-AVI-415, CERTFR-2020-AVI-547, CVE-2020-10720, openSUSE-SU-2020:0801-1, RHSA-2020:2854-01, SUSE-SU-2020:1255-1, SUSE-SU-2020:1599-1, SUSE-SU-2020:1663-1, SUSE-SU-2020:2156-1, SUSE-SU-2020:2478-1, SUSE-SU-2020:2487-1, VIGILANCE-VUL-32514.

Description of the vulnerability 

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

Our Vigil@nce team determined that the severity of this computer vulnerability bulletin 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 weakness note.

Solutions for this threat 

Linux kernel: version 4.14.124.
The version 4.14.124 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: patch for napi_gro_frags.
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-lp151.28.52.1

RHEL 7: new kernel-alt packages.
New packages are available:
  RHEL 7.0-7.8: kernel-alt 4.14.0-115.26.1.el7a

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-rt packages.
New packages are available:
  SUSE LE 12 SP4: kernel-rt 4.12.14-8.23.1

SUSE LE 12 SP5: new kernel-rt packages (03/09/2020).
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.13.1

SUSE LE 15: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-150.52.1

SUSE LE 15 SP1: new kernel packages.
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.45.1

SUSE LE 15 SP1: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.28.1
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