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Vulnerability of Linux kernel: use after free via BlueTooth

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via BlueTooth of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Vulnerable products: Fedora, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES.
Severity of this weakness: 1/4.
Creation date: 11/05/2021.
Références of this bulletin: CERTFR-2021-AVI-452, CVE-2021-32399, FEDORA-2021-0722515c0a, openSUSE-SU-2021:0843-1, SUSE-SU-2021:1887-1, SUSE-SU-2021:1888-1, SUSE-SU-2021:1889-1, SUSE-SU-2021:1890-1, SUSE-SU-2021:1891-1, SUSE-SU-2021:1899-1, SUSE-SU-2021:1912-1, SUSE-SU-2021:1913-1, SUSE-SU-2021:1975-1, SUSE-SU-2021:1977-1, VIGILANCE-VUL-35316.

Description of the vulnerability 

An attacker can force the usage of a freed memory area via BlueTooth 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, SUSE Linux Enterprise Desktop, SLES.

Our Vigil@nce team determined that the severity of this computer vulnerability note is low.

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: version 5.12.4.
The version 5.12.4 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Fedora 32: new kernel packages.
New packages are available:
  Fedora 32: kernel 5.11.22-100.fc32

Linux kernel: version 5.11.21.
The version 5.11.21 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.10.37.
The version 5.10.37 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.119.
The version 5.4.119 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.191.
The version 4.19.191 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.233.
The version 4.14.233 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.271.
The version 4.4.271 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

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

openSUSE Leap 15.2: new kernel packages.
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.78.1

SUSE LE 12 SP4: new kernel packages.
New packages are available:
  SUSE LE 12 SP4: kernel 4.12.14-95.77.1

SUSE LE 12 SP5: new kernel-azure packages.
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.59.1

SUSE LE 12 SP5: new kernel packages.
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.74.1

SUSE LE 12 SP5: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.46.1

SUSE LE 15 SP1: new kernel packages.
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.92.1

SUSE LE 15 SP2: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP2: kernel-azure 5.3.18-18.50.2

SUSE LE 15 SP2: new kernel packages.
New packages are available:
  SUSE LE 15 SP2: kernel 5.3.18-24.67.3

SUSE LE 15 SP2: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP2: kernel-rt 5.3.18-39.1

SUSE LE 15 SP3: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP3: kernel-azure 5.3.18-38.3.1

SUSE LE 15 SP3: new kernel packages.
New packages are available:
  SUSE LE 15 SP3: kernel 5.3.18-59.5.2
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