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Vulnerability of Linux kernel: buffer overflow via MAX_RW_COUNT

Synthesis of the vulnerability 

An attacker can trigger a buffer overflow via MAX_RW_COUNT of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Vulnerable systems: Fedora, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this threat: 1/4.
Creation date: 12/05/2021.
Références of this weakness: CERTFR-2021-AVI-372, CERTFR-2021-AVI-452, CVE-2021-3491, FEDORA-2021-05152dbcf5, FEDORA-2021-0722515c0a, FEDORA-2021-286375de1e, 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, USN-4948-1, USN-4949-1, USN-4950-1, VIGILANCE-VUL-35396, ZDI-21-589.

Description of the vulnerability 

An attacker can trigger a buffer overflow via MAX_RW_COUNT of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
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This cybersecurity vulnerability impacts software or systems such as Fedora, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this vulnerability 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 weakness alert.

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: patch for io_add_buffers.
A patch is indicated in information sources.

Fedora 33-34: new kernel-headers packages.
New packages are available:
  Fedora 33: kernel-headers 5.11.20-200.fc33
  Fedora 34: kernel-headers 5.11.20-300.fc34

Fedora 33-34: new kernel packages.
New packages are available:
  Fedora 33: kernel 5.11.20-200.fc33
  Fedora 34: kernel 5.11.20-300.fc34

Fedora 33-34: new kernel-tools packages.
New packages are available:
  Fedora 33: kernel-tools 5.11.20-200.fc33
  Fedora 34: kernel-tools 5.11.20-300.fc34

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

Ubuntu: new linux-image-5.10.0 packages.
New packages are available:
  Ubuntu 20.04 LTS: linux-image-5.10.0-1026-oem 5.10.0-1026.27, linux-image-oem-20.04b 5.10.0.1026.27

Ubuntu: new linux-image-5.11.0 packages.
New packages are available, as indicated in information sources.

Ubuntu: new linux-image-5.8.0 packages.
New packages are available, as indicated in information sources.
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