Vulnerability of Linux kernel: denial of service via sg_write

Synthesis of the vulnerability

An attacker can trigger a fatal error via sg_write() of the Linux kernel, in order to trigger a denial of service.

Impacted software: Debian, Fedora, Tivoli Storage Manager, Linux, RHEL, Slackware, Ubuntu.

Severity of this computer vulnerability: 1/4.

Creation date: 11/05/2020.

Références of this announce: 6410876, CERTFR-2020-AVI-368, CERTFR-2020-AVI-421, CERTFR-2020-AVI-612, CERTFR-2020-AVI-710, CERTFR-2020-AVI-770, CERTFR-2020-AVI-823, CERTFR-2020-AVI-841, CVE-2020-12770, DLA-2241-1, DLA-2241-2, DLA-2242-1, DSA-4698-1, DSA-4699-1, FEDORA-2020-4c69987c40, FEDORA-2020-5a69decc0c, FEDORA-2020-c6b9fff7f8, RHSA-2020:4060-01, RHSA-2020:4062-01, RHSA-2020:4431-01, RHSA-2020:4609-01, RHSA-2020:5206-01, RHSA-2020:5430-01, RHSA-2020:5656-01, SSA:2020-163-01, USN-4411-1, USN-4412-1, USN-4413-1, USN-4414-1, USN-4419-1, VIGILANCE-VUL-32224.

Description of the vulnerability

An attacker can trigger a fatal error via sg_write() of the Linux kernel, in order to trigger a denial of service.
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This weakness impacts software or systems such as Debian, Fedora, Tivoli Storage Manager, Linux, RHEL, Slackware, Ubuntu.

Our Vigil@nce team determined that the severity of this vulnerability announce 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 threat bulletin.

Solutions for this threat

Linux kernel: version 5.6.12.
The version 5.6.12 is fixed:
https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.42.
The version 5.4.42 is fixed:
https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.4.42.tar.xz

Linux kernel: version 4.19.124.
The version 4.19.124 is fixed:
https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.19.124.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 3.16.85.
The version 3.16.85 is fixed:
https://cdn.kernel.org/pub/linux/kernel/v3.x/

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

Debian 10: new linux packages.
New packages are available:
Debian 10: linux 4.19.118-2+deb10u1

Debian 8: new linux-4.9 packages.
New packages are available:
Debian 8: linux-4.9 4.9.210-1+deb9u1~deb8u1

Debian 8: new linux packages.
New packages are available:
Debian 8: linux 3.16.84-1

Debian 9: new linux packages.
New packages are available:
Debian 9: linux 4.9.210-1+deb9u1

Fedora 30-31: new kernel packages.
New packages are available:
Fedora 30: kernel 5.6.13-100.fc30
Fedora 31: kernel 5.6.13-200.fc31

Fedora 32: new kernel packages.
New packages are available:
Fedora 32: kernel 5.6.12-300.fc32

IBM Spectrum Protect Plus: fixed versions for Linux/Java.
Fixed versions are indicated in information sources.

RHEL 7.4: new kernel packages.
New packages are available:
RHEL 7.0-7.9: kernel 3.10.0-693.81.1.el7

RHEL 7.6: new kernel packages.
New packages are available:
RHEL 7.6: kernel 3.10.0-957.65.1.el7

RHEL 7.7: new kernel packages.
New packages are available:
RHEL 7.0-7.9: kernel 3.10.0-1062.40.1.el7

RHEL 7.8: new kernel packages.
New packages are available:
RHEL 7.0-7.8: kernel 3.10.0-1160.el7

RHEL 7.8: new kernel-rt packages.
New packages are available:
RHEL 7.0-7.8: kernel-rt 3.10.0-1160.rt56.1131.el7

RHEL 8: new kernel packages (04/11/2020).
New packages are available:
RHEL 8.0-8.2: kernel 4.18.0-240.el8

RHEL 8: new kernel-rt packages (04/11/2020).
New packages are available:
RHEL 8.0-8.2: kernel-rt 4.18.0-240.rt7.54.el8

Slackware 14.2: new kernel packages.
New packages are available:
Slackware 14.2: kernel 4.4.227-i586-1

Ubuntu 18.04: new linux-image-5.0.0 packages.
New packages are available:
Ubuntu 18.04 LTS: linux-image-gke-5.0 5.0.0.1043.28

Ubuntu 20.04: new linux-image-5.4.0 packages.
New packages are available:
Ubuntu 20.04 LTS: linux-image-generic 5.4.0.28.35

Ubuntu: new linux-image-4.15.0 packages.
New packages are available:
Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.107.112
Ubuntu 18.04 LTS: linux-image-generic 4.15.0.109.97

Ubuntu: new linux-image-4.4.0 packages.
New packages are available:
Ubuntu 14.04 ESM: linux-image-generic-lts-xenial 4.4.0.185.162
Ubuntu 16.04 LTS: linux-image-generic 4.4.0.185.191

Ubuntu: new linux-image-5.3.0 packages.
New packages are available:
Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 5.3.0.62.115
Ubuntu 19.10: linux-image-generic 5.3.0.62.52

Wind River Linux: version 10.18.44.17.
The version 10.18.44.17 is fixed:
https://support2.windriver.com/

Wind River Linux: version 10.19.45.8.
The version 10.19.45.8 is fixed.
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