Out-of-bounds read in Linux kernel - CVE-2020-36791

Vulnerability identifier: #VU108795

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-36791

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to an out-of-bounds read error within the tcindex_set_parms() function in net/sched/cls_tcindex.c. A local user can perform a denial of service (DoS) attack.

Linux kernel
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 15 SP3
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Enterprise Server 15 SP3 Business Critical
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Manager Proxy
SUSE Manager Retail Branch Server
SUSE Manager Server
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
SUSE Enterprise Storage
SUSE Linux Enterprise Live Patching
openSUSE Leap
kgraft-patch-4_12_14-122_261-default
kernel-livepatch-SLE15-SP3_Update_58-debugsource
kernel-livepatch-5_3_18-150300_59_207-preempt
kernel-livepatch-5_3_18-150300_59_207-preempt-debuginfo
kernel-livepatch-5_3_18-150300_59_207-default
kernel-livepatch-5_3_18-150300_59_207-default-debuginfo
ocfs2-kmp-default-debuginfo
kernel-default-devel-debuginfo
kernel-default-man
kernel-default-kgraft
kernel-default-kgraft-devel
kernel-devel
dlm-kmp-default-debuginfo
dlm-kmp-default
kernel-default-debuginfo
kernel-default-debugsource
cluster-md-kmp-default
ocfs2-kmp-default
kernel-macros
kernel-source
kernel-default
cluster-md-kmp-default-debuginfo
kernel-default-base-debuginfo
kernel-default-base
kernel-default-devel
gfs2-kmp-default-debuginfo
gfs2-kmp-default
kernel-syms
cluster-md-kmp-64kb
dtb-xilinx
dtb-zte
kernel-64kb-extra-debuginfo
dtb-amd
dtb-exynos
dtb-nvidia
gfs2-kmp-64kb
dtb-broadcom
dlm-kmp-64kb-debuginfo
dtb-allwinner
reiserfs-kmp-64kb
kernel-64kb-optional-debuginfo
kernel-64kb-extra
kernel-64kb-devel-debuginfo
kernel-64kb-optional
dtb-mediatek
kselftests-kmp-64kb
dtb-renesas
ocfs2-kmp-64kb-debuginfo
ocfs2-kmp-64kb
kernel-64kb
dtb-al
kselftests-kmp-64kb-debuginfo
kernel-64kb-debuginfo
dtb-sprd
dtb-marvell
dtb-lg
dtb-hisilicon
kernel-64kb-debugsource
kernel-64kb-devel
cluster-md-kmp-64kb-debuginfo
reiserfs-kmp-64kb-debuginfo
dtb-socionext
dlm-kmp-64kb
gfs2-kmp-64kb-debuginfo
dtb-rockchip
dtb-qcom
dtb-apm
dtb-altera
dtb-cavium
dtb-arm
kernel-default-livepatch
kernel-default-optional-debuginfo
kernel-obs-qa
kernel-default-extra-debuginfo
kernel-default-optional
kselftests-kmp-default-debuginfo
reiserfs-kmp-default
dtb-amlogic
kernel-obs-build
reiserfs-kmp-default-debuginfo
kernel-obs-build-debugsource
kselftests-kmp-default
kernel-default-extra
kernel-docs-html
kernel-source-vanilla
kernel-docs
ocfs2-kmp-preempt-debuginfo
kernel-preempt-devel-debuginfo
reiserfs-kmp-preempt
kernel-preempt-debuginfo
kernel-preempt-extra
gfs2-kmp-preempt
gfs2-kmp-preempt-debuginfo
cluster-md-kmp-preempt
cluster-md-kmp-preempt-debuginfo
kernel-kvmsmall
kernel-preempt-debugsource
kernel-preempt
kernel-zfcpdump
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
dtb-aarch64
dtb-freescale
kernel-preempt-optional-debuginfo
kernel-default-livepatch-devel
kernel-kvmsmall-devel
kernel-kvmsmall-debugsource
kernel-kvmsmall-debuginfo
kernel-kvmsmall-devel-debuginfo
kselftests-kmp-preempt-debuginfo
kernel-preempt-optional
reiserfs-kmp-preempt-debuginfo
ocfs2-kmp-preempt
kselftests-kmp-preempt
dlm-kmp-preempt-debuginfo
kernel-preempt-devel
kernel-preempt-extra-debuginfo
dlm-kmp-preempt
kernel-default-base-rebuild
kernel-rt
kernel-rt-debugsource
kernel-rt-debuginfo
kernel-source-rt

Install update from vendor's website.

Linux kernel - update to 4.4.218
kgraft-patch-4_12_14-122_261-default - update to 1-8.3.1
kernel-livepatch-SLE15-SP3_Update_58-debugsource - update to 1-150300.7.3.1
kernel-livepatch-5_3_18-150300_59_207-preempt - update to 1-150300.7.3.1
kernel-livepatch-5_3_18-150300_59_207-preempt-debuginfo - update to 1-150300.7.3.1
kernel-livepatch-5_3_18-150300_59_207-default - update to 1-150300.7.3.1
kernel-livepatch-5_3_18-150300_59_207-default-debuginfo - update to 1-150300.7.3.1
ocfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.261.1, 5.3.18-150300.59.207.1
kernel-default-devel-debuginfo - addressed in versions 4.12.14-122.261.1, 5.3.18-150300.59.207.1
kernel-default-man - update to 4.12.14-122.261.1
kernel-default-kgraft - update to 4.12.14-122.261.1
kernel-default-kgraft-devel - update to 4.12.14-122.261.1
kernel-devel - addressed in versions 4.12.14-122.261.1, 5.3.18-150300.59.207.1
dlm-kmp-default-debuginfo - addressed in versions 4.12.14-122.261.1, 5.3.18-150300.59.207.1
dlm-kmp-default - addressed in versions 4.12.14-122.261.1, 5.3.18-150300.59.207.1
kernel-default-debuginfo - addressed in versions 4.12.14-122.261.1, 5.3.18-150300.59.207.1
kernel-default-debugsource - addressed in versions 4.12.14-122.261.1, 5.3.18-150300.59.207.1
cluster-md-kmp-default - addressed in versions 4.12.14-122.261.1, 5.3.18-150300.59.207.1
ocfs2-kmp-default - addressed in versions 4.12.14-122.261.1, 5.3.18-150300.59.207.1
kernel-macros - addressed in versions 4.12.14-122.261.1, 5.3.18-150300.59.207.1
kernel-source - addressed in versions 4.12.14-122.261.1, 5.3.18-150300.59.207.1
kernel-default - addressed in versions 4.12.14-122.261.1, 5.3.18-150300.59.207.1
cluster-md-kmp-default-debuginfo - addressed in versions 4.12.14-122.261.1, 5.3.18-150300.59.207.1
kernel-default-base-debuginfo - update to 4.12.14-122.261.1
kernel-default-base - addressed in versions 4.12.14-122.261.1, 5.3.18-150300.59.207.1.150300.18.124.1
kernel-default-devel - addressed in versions 4.12.14-122.261.1, 5.3.18-150300.59.207.1
gfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.261.1, 5.3.18-150300.59.207.1
gfs2-kmp-default - addressed in versions 4.12.14-122.261.1, 5.3.18-150300.59.207.1
kernel-syms - addressed in versions 4.12.14-122.261.1, 5.3.18-150300.59.207.1
cluster-md-kmp-64kb - update to 5.3.18-150300.59.207.1
dtb-xilinx - update to 5.3.18-150300.59.207.1
dtb-zte - update to 5.3.18-150300.59.207.1
kernel-64kb-extra-debuginfo - update to 5.3.18-150300.59.207.1
dtb-amd - update to 5.3.18-150300.59.207.1
dtb-exynos - update to 5.3.18-150300.59.207.1
dtb-nvidia - update to 5.3.18-150300.59.207.1
gfs2-kmp-64kb - update to 5.3.18-150300.59.207.1
dtb-broadcom - update to 5.3.18-150300.59.207.1
dlm-kmp-64kb-debuginfo - update to 5.3.18-150300.59.207.1
dtb-allwinner - update to 5.3.18-150300.59.207.1
reiserfs-kmp-64kb - update to 5.3.18-150300.59.207.1
kernel-64kb-optional-debuginfo - update to 5.3.18-150300.59.207.1
kernel-64kb-extra - update to 5.3.18-150300.59.207.1
kernel-64kb-devel-debuginfo - update to 5.3.18-150300.59.207.1
kernel-64kb-optional - update to 5.3.18-150300.59.207.1
dtb-mediatek - update to 5.3.18-150300.59.207.1
kselftests-kmp-64kb - update to 5.3.18-150300.59.207.1
dtb-renesas - update to 5.3.18-150300.59.207.1
ocfs2-kmp-64kb-debuginfo - update to 5.3.18-150300.59.207.1
ocfs2-kmp-64kb - update to 5.3.18-150300.59.207.1
kernel-64kb - update to 5.3.18-150300.59.207.1
dtb-al - update to 5.3.18-150300.59.207.1
kselftests-kmp-64kb-debuginfo - update to 5.3.18-150300.59.207.1
kernel-64kb-debuginfo - update to 5.3.18-150300.59.207.1
dtb-sprd - update to 5.3.18-150300.59.207.1
dtb-marvell - update to 5.3.18-150300.59.207.1
dtb-lg - update to 5.3.18-150300.59.207.1
dtb-hisilicon - update to 5.3.18-150300.59.207.1
kernel-64kb-debugsource - update to 5.3.18-150300.59.207.1
kernel-64kb-devel - update to 5.3.18-150300.59.207.1
cluster-md-kmp-64kb-debuginfo - update to 5.3.18-150300.59.207.1
reiserfs-kmp-64kb-debuginfo - update to 5.3.18-150300.59.207.1
dtb-socionext - update to 5.3.18-150300.59.207.1
dlm-kmp-64kb - update to 5.3.18-150300.59.207.1
gfs2-kmp-64kb-debuginfo - update to 5.3.18-150300.59.207.1
dtb-rockchip - update to 5.3.18-150300.59.207.1
dtb-qcom - update to 5.3.18-150300.59.207.1
dtb-apm - update to 5.3.18-150300.59.207.1
dtb-altera - update to 5.3.18-150300.59.207.1
dtb-cavium - update to 5.3.18-150300.59.207.1
dtb-arm - update to 5.3.18-150300.59.207.1
kernel-default-livepatch - update to 5.3.18-150300.59.207.1
kernel-default-optional-debuginfo - update to 5.3.18-150300.59.207.1
kernel-obs-qa - update to 5.3.18-150300.59.207.1
kernel-default-extra-debuginfo - update to 5.3.18-150300.59.207.1
kernel-default-optional - update to 5.3.18-150300.59.207.1
kselftests-kmp-default-debuginfo - update to 5.3.18-150300.59.207.1
reiserfs-kmp-default - update to 5.3.18-150300.59.207.1
dtb-amlogic - update to 5.3.18-150300.59.207.1
kernel-obs-build - update to 5.3.18-150300.59.207.1
reiserfs-kmp-default-debuginfo - update to 5.3.18-150300.59.207.1
kernel-obs-build-debugsource - update to 5.3.18-150300.59.207.1
kselftests-kmp-default - update to 5.3.18-150300.59.207.1
kernel-default-extra - update to 5.3.18-150300.59.207.1
kernel-docs-html - update to 5.3.18-150300.59.207.1
kernel-source-vanilla - update to 5.3.18-150300.59.207.1
kernel-docs - update to 5.3.18-150300.59.207.1
ocfs2-kmp-preempt-debuginfo - update to 5.3.18-150300.59.207.1
kernel-preempt-devel-debuginfo - update to 5.3.18-150300.59.207.1
reiserfs-kmp-preempt - update to 5.3.18-150300.59.207.1
kernel-preempt-debuginfo - update to 5.3.18-150300.59.207.1
kernel-preempt-extra - update to 5.3.18-150300.59.207.1
gfs2-kmp-preempt - update to 5.3.18-150300.59.207.1
gfs2-kmp-preempt-debuginfo - update to 5.3.18-150300.59.207.1
cluster-md-kmp-preempt - update to 5.3.18-150300.59.207.1
cluster-md-kmp-preempt-debuginfo - update to 5.3.18-150300.59.207.1
kernel-kvmsmall - update to 5.3.18-150300.59.207.1
kernel-preempt-debugsource - update to 5.3.18-150300.59.207.1
kernel-preempt - update to 5.3.18-150300.59.207.1
kernel-zfcpdump - update to 5.3.18-150300.59.207.1
kernel-zfcpdump-debuginfo - update to 5.3.18-150300.59.207.1
kernel-zfcpdump-debugsource - update to 5.3.18-150300.59.207.1
dtb-aarch64 - update to 5.3.18-150300.59.207.1
dtb-freescale - update to 5.3.18-150300.59.207.1
kernel-preempt-optional-debuginfo - update to 5.3.18-150300.59.207.1
kernel-default-livepatch-devel - update to 5.3.18-150300.59.207.1
kernel-kvmsmall-devel - update to 5.3.18-150300.59.207.1
kernel-kvmsmall-debugsource - update to 5.3.18-150300.59.207.1
kernel-kvmsmall-debuginfo - update to 5.3.18-150300.59.207.1
kernel-kvmsmall-devel-debuginfo - update to 5.3.18-150300.59.207.1
kselftests-kmp-preempt-debuginfo - update to 5.3.18-150300.59.207.1
kernel-preempt-optional - update to 5.3.18-150300.59.207.1
reiserfs-kmp-preempt-debuginfo - update to 5.3.18-150300.59.207.1
ocfs2-kmp-preempt - update to 5.3.18-150300.59.207.1
kselftests-kmp-preempt - update to 5.3.18-150300.59.207.1
dlm-kmp-preempt-debuginfo - update to 5.3.18-150300.59.207.1
kernel-preempt-devel - update to 5.3.18-150300.59.207.1
kernel-preempt-extra-debuginfo - update to 5.3.18-150300.59.207.1
dlm-kmp-preempt - update to 5.3.18-150300.59.207.1
kernel-default-base-rebuild - update to 5.3.18-150300.59.207.1.150300.18.124.1
kernel-rt - update to 5.3.18-150300.211.1
kernel-rt-debugsource - update to 5.3.18-150300.211.1
kernel-rt-debuginfo - update to 5.3.18-150300.211.1
kernel-source-rt - update to 5.3.18-150300.211.1

• https://blog.cdthoughts.ch/2021/03/16/syzbot-bug.html
• https://git.kernel.org/stable/c/0d1c3530e1bd38382edef72591b78e877e0edcd3
• https://git.kernel.org/stable/c/557d015ffb27b672e24e6ad141fd887783871dc2
• https://git.kernel.org/stable/c/9f8b6c44be178c2498a00b270872a6e30e7c8266
• https://git.kernel.org/stable/c/bd3ee8fb6371b45c71c9345cc359b94da2ddefa9
• https://git.kernel.org/stable/c/c4453d2833671e3a9f6bd52f0f581056c3736386
• https://git.kernel.org/stable/c/d23faf32e577922b6da20bf3740625c1105381bf
• https://git.kernel.org/stable/c/d6cdc5bb19b595486fb2e6661e5138d73a57f454
• https://syzkaller.appspot.com/bug?id=ea260693da894e7b078d18fca2c9c0a19b457534
• https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.218

• Out-of-bounds read in Linux kernel sched
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel