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Vulnerability of Linux kernel: use after free via af_alg_release

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via af_alg_release() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Impacted software: Fedora, Linux, openSUSE Leap, Palo Alto Firewall PA***, PAN-OS, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this computer vulnerability: 2/4.
Creation date: 19/02/2019.
Références of this announce: CERTFR-2019-AVI-131, CERTFR-2019-AVI-145, CERTFR-2019-AVI-335, CERTFR-2020-AVI-051, CVE-2019-8912, FEDORA-2019-16de0047d4, FEDORA-2019-7bdeed7fc5, openSUSE-SU-2019:1193-1, PAN-SA-2019-0017, RHSA-2020:0174-01, SUSE-SU-2019:0765-1, SUSE-SU-2019:0767-1, USN-3930-1, USN-3930-2, USN-3931-1, USN-3931-2, VIGILANCE-VUL-28540.

Description of the vulnerability 

An attacker can force the usage of a freed memory area via af_alg_release() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
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This weakness alert impacts software or systems such as Fedora, Linux, openSUSE Leap, Palo Alto Firewall PA***, PAN-OS, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

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

Solutions for this threat 

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

Fedora 29: new kernel packages.
New packages are available:
  Fedora 29: kernel 4.20.11-200.fc29

Fedora: new kernel-headers packages.
New packages are available:
  Fedora 29: kernel-headers 4.20.11-200.fc29

Fedora: new kernel-tools packages.
New packages are available:
  Fedora 28: kernel-tools 4.20.11-100.fc28
  Fedora 29: kernel-tools 4.20.11-200.fc29

openSUSE Leap 15.0: new kernel packages.
New packages are available:
  openSUSE Leap 15.0: kernel 4.12.14-lp150.12.58.1

Palo Alto PAN-OS: fixed versions for Linux af_alg_release.
Fixed versions are indicated in information sources.

RHEL 7: new kernel-alt packages.
New packages are available:
  RHEL 7.0-7.7: kernel-alt 4.14.0-115.17.1.el7a

SUSE LE 12 SP4: new kernel-azure packages.
New packages are available:
  SUSE LE 12 SP4: kernel-azure 4.12.14-6.9.1

SUSE LE 12 SP4: new kernel packages (27/03/2019).
New packages are available:
  SUSE LE 12 SP4: kernel 4.12.14-95.13.1

Ubuntu: new linux-image-4.15.0 packages.
New packages are available:
  Ubuntu 14.04 LTS: linux-image-azure 4.15.0.1041.28
  Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.47.68
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.47.49

Ubuntu: new linux-image-4.18.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 4.18.0.17.67
  Ubuntu 18.10: linux-image-generic 4.18.0.17.18

Wind River Linux: solution (21/05/2019).
The solution is indicated in information sources.
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