NULL pointer dereference in Linux kernel - CVE-2020-10711

Vulnerability identifier: #VU28180

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-10711

CWE-ID: CWE-476

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in the Linux kernel's SELinux subsystem when importing the Commercial IP Security Option (CIPSO) protocol's category bitmap into the SELinux extensible bitmap via the' ebitmap_netlbl_import' routine. While processing the CIPSO restricted bitmap tag in the 'cipso_v4_parsetag_rbm' routine, it sets the security attribute to indicate that the category bitmap is present, even if it has not been allocated.

A remote attacker can send specially crafted packets the affected system, trigger a NULL pointer dereference error and crash the Linux kernel.

Linux kernel
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Slackware Linux
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kpatch-patch-3_10_0-1062 (Red Hat package)
kpatch-patch-3_10_0-1062_1_2 (Red Hat package)
kpatch-patch-4_18_0-147 (Red Hat package)
kpatch-patch-3_10_0-1062_1_1 (Red Hat package)
kernel (Red Hat package)
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kpatch-patch-3_10_0-1062_21_1 (Red Hat package)
kpatch-patch-3_10_0-1062_18_1 (Red Hat package)
kpatch-patch-3_10_0-1062_12_1 (Red Hat package)
kpatch-patch-4_18_0-193 (Red Hat package)
kpatch-patch-4_18_0-147_8_1 (Red Hat package)
kpatch-patch-3_10_0-957_48_1 (Red Hat package)
kpatch-patch-3_10_0-957_46_1 (Red Hat package)
kpatch-patch-3_10_0-957_43_1 (Red Hat package)
kpatch-patch-3_10_0-957_41_1 (Red Hat package)
kpatch-patch-4_18_0-147_5_1 (Red Hat package)
kpatch-patch-3_10_0-957_38_2 (Red Hat package)
kpatch-patch-3_10_0-957_38_3 (Red Hat package)
kpatch-patch-3_10_0-957_38_1 (Red Hat package)
kpatch-patch-3_10_0-1062_7_1 (Red Hat package)
kpatch-patch-3_10_0-1062_9_1 (Red Hat package)
kpatch-patch-3_10_0-957_35_2 (Red Hat package)
kpatch-patch-3_10_0-957_35_1 (Red Hat package)
kpatch-patch-4_18_0-147_0_3 (Red Hat package)
kpatch-patch-4_18_0-147_0_2 (Red Hat package)
kpatch-patch-4_18_0-147_3_1 (Red Hat package)
kpatch-patch-3_10_0-1062_4_2 (Red Hat package)
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kpatch-patch-3_10_0-1062_4_1 (Red Hat package)
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linux-image-4.4.0-185-generic-lpae (Ubuntu package)
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linux-image-aws (Ubuntu package)
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linux-image-kvm (Ubuntu package)
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linux-4.4.227/kernel-modules
linux-4.4.227/kernel-huge
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linux-image-4.15.0-107-generic (Ubuntu package)
linux-image-4.15.0-107-generic-lpae (Ubuntu package)
linux-image-4.15.0-107-lowlatency (Ubuntu package)
linux-image-virtual-hwe-16.04 (Ubuntu package)
linux-image-oem (Ubuntu package)
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linux-image-lowlatency-hwe-16.04 (Ubuntu package)
linux-image-4.15.0-109-lowlatency (Ubuntu package)
linux-image-4.15.0-109-generic-lpae (Ubuntu package)
linux-image-4.15.0-109-generic (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-4.15.0-1046-oracle (Ubuntu package)
linux-image-4.15.0-1048-oracle (Ubuntu package)
linux-image-oracle-lts-18.04 (Ubuntu package)
linux-image-gke (Ubuntu package)
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linux-image-4.15.0-1065-raspi2 (Ubuntu package)
linux-image-4.15.0-1069-kvm (Ubuntu package)
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linux-image-4.15.0-1074-aws (Ubuntu package)
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linux-image-4.15.0-1077-aws (Ubuntu package)
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linux-image-4.15.0-1078-gcp (Ubuntu package)
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linux-image-5.4.0-40-lowlatency (Ubuntu package)
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linux-image-5.4.0-1019-oracle (Ubuntu package)
linux-image-5.4.0-1019-gcp (Ubuntu package)
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Install updates from vendor's website.

kpatch-patch-3_10_0-1062 (Red Hat package) - update to 1-18.el7
kpatch-patch-3_10_0-1062_1_2 (Red Hat package) - update to 1-16.el7
kpatch-patch-4_18_0-147 (Red Hat package) - update to 1-13.el8
kpatch-patch-3_10_0-1062_1_1 (Red Hat package) - update to 1-17.el7
kernel (Red Hat package) - addressed in versions 2.6.32-754.29.2.el6, 3.10.0-327.88.1.el7, 3.10.0-514.76.1.el7, 3.10.0-693.67.1.el7, 3.10.0-957.54.1.el7, 3.10.0-1127.8.2.el7, 4.18.0-80.23.2.el8_0, 4.18.0-147.13.2.el8_1, 4.18.0-193.1.2.el8_2
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kpatch-patch-3_10_0-1062_21_1 (Red Hat package) - update to 1-2.el7
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kpatch-patch-3_10_0-1062_12_1 (Red Hat package) - update to 1-2.el7
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kpatch-patch-4_18_0-147_8_1 (Red Hat package) - update to 1-2.el8_1
kpatch-patch-3_10_0-957_48_1 (Red Hat package) - update to 1-3.el7
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kpatch-patch-3_10_0-957_43_1 (Red Hat package) - update to 1-4.el7
kpatch-patch-3_10_0-957_41_1 (Red Hat package) - update to 1-4.el7
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kpatch-patch-3_10_0-1062_7_1 (Red Hat package) - update to 1-7.el7
kpatch-patch-3_10_0-1062_9_1 (Red Hat package) - update to 1-7.el7
kpatch-patch-3_10_0-957_35_2 (Red Hat package) - update to 1-8.el7
kpatch-patch-3_10_0-957_35_1 (Red Hat package) - update to 1-9.el7
kpatch-patch-4_18_0-147_0_3 (Red Hat package) - update to 1-9.el8
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kpatch-patch-4_18_0-147_3_1 (Red Hat package) - update to 1-9.el8_1
kpatch-patch-3_10_0-1062_4_2 (Red Hat package) - update to 1-10.el7
kpatch-patch-3_10_0-1062_4_3 (Red Hat package) - update to 1-10.el7
kpatch-patch-3_10_0-1062_4_1 (Red Hat package) - update to 1-13.el7
Data Computing Appliance (DCA) - update to 4.2.0.0
linux-image-generic-lpae-lts-xenial (Ubuntu package) - update to 4.4.0.185.162
linux-image-powerpc-e500mc-lts-xenial (Ubuntu package) - update to 4.4.0.185.162
linux-image-lowlatency-lts-xenial (Ubuntu package) - update to 4.4.0.185.162
linux-image-generic-lts-xenial (Ubuntu package) - update to 4.4.0.185.162
linux-image-powerpc-smp-lts-xenial (Ubuntu package) - update to 4.4.0.185.162
linux-image-powerpc64-emb-lts-xenial (Ubuntu package) - update to 4.4.0.185.162
linux-image-virtual-lts-xenial (Ubuntu package) - update to 4.4.0.185.162
linux-image-powerpc64-smp-lts-xenial (Ubuntu package) - update to 4.4.0.185.162
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linux-image-generic (Ubuntu package) - addressed in versions 4.4.0.185.191, 4.15.0.109.97, 5.4.0.40.43
linux-image-generic-lpae (Ubuntu package) - addressed in versions 4.4.0.185.191, 4.15.0.109.97, 5.4.0.40.43
linux-image-lowlatency (Ubuntu package) - addressed in versions 4.4.0.185.191, 4.15.0.109.97, 5.4.0.40.43
linux-image-powerpc-e500mc (Ubuntu package) - update to 4.4.0.185.191
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linux-image-powerpc64-emb (Ubuntu package) - update to 4.4.0.185.191
linux-image-virtual (Ubuntu package) - addressed in versions 4.4.0.185.191, 4.15.0.109.97, 5.4.0.40.43
linux-image-4.4.0-185-powerpc-e500mc (Ubuntu package) - addressed in versions 4.4.0-185.215, 4.4.0-185.215~14.04.1
linux-image-4.4.0-185-lowlatency (Ubuntu package) - addressed in versions 4.4.0-185.215, 4.4.0-185.215~14.04.1
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linux-image-4.4.0-185-powerpc64-emb (Ubuntu package) - addressed in versions 4.4.0-185.215, 4.4.0-185.215~14.04.1
linux-image-4.4.0-185-generic (Ubuntu package) - addressed in versions 4.4.0-185.215, 4.4.0-185.215~14.04.1
linux-image-4.4.0-185-powerpc64-smp (Ubuntu package) - addressed in versions 4.4.0-185.215, 4.4.0-185.215~14.04.1
linux-image-aws (Ubuntu package) - addressed in versions 4.4.0.1074.71, 4.4.0.1110.114, 5.3.0.1030.28, 5.4.0.1018.19
linux-image-4.4.0-1074-aws (Ubuntu package) - update to 4.4.0-1074.78
linux-image-kvm (Ubuntu package) - addressed in versions 4.4.0.1076.74, 4.15.0.1069.65, 5.4.0.1018.17
linux-image-4.4.0-1076-kvm (Ubuntu package) - update to 4.4.0-1076.83
linux-image-4.4.0-1110-aws (Ubuntu package) - update to 4.4.0-1110.121
linux-image-raspi2 (Ubuntu package) - addressed in versions 4.4.0.1135.135, 4.15.0.1065.63, 5.4.0.1013.13
linux-image-4.4.0-1135-raspi2 (Ubuntu package) - update to 4.4.0-1135.144
linux-image-snapdragon (Ubuntu package) - addressed in versions 4.4.0.1139.131, 4.15.0.1081.84
linux-image-4.4.0-1139-snapdragon (Ubuntu package) - update to 4.4.0-1139.147
linux-4.4.227/kernel-modules - update to 4.4.227
linux-4.4.227/kernel-huge - update to 4.4.227
linux-4.4.227/kernel-generic - update to 4.4.227
linux-4.4.227/kernel-headers - update to 4.4.227_smp
kernel-alt (Red Hat package) - update to 4.14.0-115.21.2.el7a
linux-image-4.15.0-107-generic (Ubuntu package) - update to 4.15.0-107.108~16.04.1
linux-image-4.15.0-107-generic-lpae (Ubuntu package) - update to 4.15.0-107.108~16.04.1
linux-image-4.15.0-107-lowlatency (Ubuntu package) - update to 4.15.0-107.108~16.04.1
linux-image-virtual-hwe-16.04 (Ubuntu package) - update to 4.15.0.107.112
linux-image-oem (Ubuntu package) - addressed in versions 4.15.0.107.112, 4.15.0.1091.94, 5.4.0.40.43
linux-image-generic-hwe-16.04 (Ubuntu package) - update to 4.15.0.107.112
linux-image-generic-lpae-hwe-16.04 (Ubuntu package) - update to 4.15.0.107.112
linux-image-lowlatency-hwe-16.04 (Ubuntu package) - update to 4.15.0.107.112
linux-image-4.15.0-109-lowlatency (Ubuntu package) - update to 4.15.0-109.110
linux-image-4.15.0-109-generic-lpae (Ubuntu package) - update to 4.15.0-109.110
linux-image-4.15.0-109-generic (Ubuntu package) - update to 4.15.0-109.110
linux-image-oracle (Ubuntu package) - addressed in versions 4.15.0.1046.39, 5.3.0.1028.25, 5.4.0.1019.17
linux-image-4.15.0-1046-oracle (Ubuntu package) - update to 4.15.0-1046.50~16.04.1
linux-image-4.15.0-1048-oracle (Ubuntu package) - update to 4.15.0-1048.52
linux-image-oracle-lts-18.04 (Ubuntu package) - update to 4.15.0.1048.57
linux-image-gke (Ubuntu package) - addressed in versions 4.15.0.1064.66, 4.15.0.1078.80, 5.4.0.1019.17
linux-image-gke-4.15 (Ubuntu package) - update to 4.15.0.1064.66
linux-image-4.15.0-1064-gke (Ubuntu package) - update to 4.15.0-1064.67
linux-image-4.15.0-1065-raspi2 (Ubuntu package) - update to 4.15.0-1065.69
linux-image-4.15.0-1069-kvm (Ubuntu package) - update to 4.15.0-1069.70
linux-image-aws-hwe (Ubuntu package) - update to 4.15.0.1074.74
linux-image-4.15.0-1074-aws (Ubuntu package) - update to 4.15.0-1074.78~16.04.1
linux-image-aws-lts-18.04 (Ubuntu package) - update to 4.15.0.1077.79
linux-image-4.15.0-1077-aws (Ubuntu package) - update to 4.15.0-1077.81
linux-image-gcp (Ubuntu package) - addressed in versions 4.15.0.1078.80, 5.3.0.1030.24, 5.4.0.1019.17
linux-image-4.15.0-1078-gcp (Ubuntu package) - addressed in versions 4.15.0-1078.88, 4.15.0-1078.88~16.04.1
linux-image-gcp-lts-18.04 (Ubuntu package) - update to 4.15.0.1078.94
linux-image-4.15.0-1081-snapdragon (Ubuntu package) - update to 4.15.0-1081.88
linux-image-azure-lts-18.04 (Ubuntu package) - update to 4.15.0.1091.62
linux-image-azure (Ubuntu package) - addressed in versions 4.15.0.1091.68, 4.15.0.1091.86, 5.3.0.1032.28, 5.4.0.1020.19
linux-image-4.15.0-1091-azure (Ubuntu package) - addressed in versions 4.15.0-1091.101, 4.15.0-1091.101~14.04.1, 4.15.0-1091.101~16.04.1
linux-image-4.15.0-1091-oem (Ubuntu package) - update to 4.15.0-1091.101
perf - update to 4.19.91-26
bpftool - update to 4.19.91-26
kernel - update to 4.19.91-26
kernel-debug - update to 4.19.91-26
kernel-debug-devel - update to 4.19.91-26
kernel-devel - update to 4.19.91-26
kernel-headers - update to 4.19.91-26
kernel-tools - update to 4.19.91-26
kernel-tools-libs - update to 4.19.91-26
kernel-tools-libs-devel - update to 4.19.91-26
python-perf - update to 4.19.91-26
linux-image-gke-5.0 (Ubuntu package) - update to 5.0.0.1043.28
linux-image-5.0.0-1043-gke (Ubuntu package) - update to 5.0.0-1043.44
linux-image-oem-osp1 (Ubuntu package) - addressed in versions 5.0.0.1063.61, 5.4.0.40.43
linux-image-5.0.0-1063-oem-osp1 (Ubuntu package) - update to 5.0.0-1063.68
linux-image-5.3.0-62-snapdragon (Ubuntu package) - update to 5.3.0-62.56
linux-image-5.3.0-62-lowlatency (Ubuntu package) - addressed in versions 5.3.0-62.56, 5.3.0-62.56~18.04.1
linux-image-5.3.0-62-generic (Ubuntu package) - addressed in versions 5.3.0-62.56, 5.3.0-62.56~18.04.1
linux-image-5.3.0-62-generic-lpae (Ubuntu package) - update to 5.3.0-62.56~18.04.1
linux-image-snapdragon-hwe-18.04 (Ubuntu package) - update to 5.3.0.62.115
linux-image-virtual-hwe-18.04 (Ubuntu package) - update to 5.3.0.62.115
linux-image-lowlatency-hwe-18.04 (Ubuntu package) - update to 5.3.0.62.115
linux-image-gkeop-5.3 (Ubuntu package) - update to 5.3.0.62.115
linux-image-generic-lpae-hwe-18.04 (Ubuntu package) - update to 5.3.0.62.115
linux-image-generic-hwe-18.04 (Ubuntu package) - update to 5.3.0.62.115
linux-image-5.3.0-1024-kvm (Ubuntu package) - update to 5.3.0-1024.26
linux-image-raspi2-hwe-18.04 (Ubuntu package) - update to 5.3.0.1028.17
linux-image-5.3.0-1028-oracle (Ubuntu package) - addressed in versions 5.3.0-1028.30, 5.3.0-1028.30~18.04.1
linux-image-5.3.0-1028-raspi2 (Ubuntu package) - update to 5.3.0-1028.30~18.04.2
linux-image-gke-5.3 (Ubuntu package) - update to 5.3.0.1030.15
linux-image-5.3.0-1030-gcp (Ubuntu package) - addressed in versions 5.3.0-1030.32, 5.3.0-1030.32~18.04.1
linux-image-5.3.0-1030-aws (Ubuntu package) - addressed in versions 5.3.0-1030.32, 5.3.0-1030.32~18.04.1
linux-image-5.3.0-1030-gke (Ubuntu package) - update to 5.3.0-1030.32~18.04.1
linux-image-5.3.0-1032-azure (Ubuntu package) - addressed in versions 5.3.0-1032.33, 5.3.0-1032.33~18.04.1
linux-image-5.4.0-28-generic (Ubuntu package) - update to 5.4.0-28.32
linux-image-5.4.0-40-lowlatency (Ubuntu package) - update to 5.4.0-40.44~18.04.1
linux-image-5.4.0-40-generic-lpae (Ubuntu package) - update to 5.4.0-40.44~18.04.1
linux-image-5.4.0-40-generic (Ubuntu package) - update to 5.4.0-40.44~18.04.1
linux-image-raspi (Ubuntu package) - update to 5.4.0.1013.13
linux-image-5.4.0-1013-raspi (Ubuntu package) - update to 5.4.0-1013.13~18.04.1
linux-image-5.4.0-1018-aws (Ubuntu package) - update to 5.4.0-1018.18~18.04.1
linux-image-5.4.0-1019-oracle (Ubuntu package) - update to 5.4.0-1019.19~18.04.1
linux-image-5.4.0-1019-gcp (Ubuntu package) - update to 5.4.0-1019.19~18.04.2
linux-image-5.4.0-1020-azure (Ubuntu package) - update to 5.4.0-1020.20~18.04.1
kernel - addressed in versions 5.6.13-100.fc30, 5.6.13-200.fc31, 5.6.13-300.fc32
Juniper Junos Space - update to 20.3R1

• https://www.openwall.com/lists/oss-security/2020/05/12/2
• https://access.redhat.com/security/cve/cve-2020-10711
• https://bugzilla.redhat.com/show_bug.cgi?id=1825116
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4b8feff251da3d7058b5779e21b33a85c686b974

• Remote denial of service in Linux kernel
• Red Hat Enterprise MRG 2 update for kernel-rt
• Red Hat Enterprise Linux 8 update for kpatch-patch
• Red Hat Enterprise Linux 7 update for kernel
• Red Hat Enterprise Linux 8 update for kernel-rt
• Red Hat Enterprise Linux 8 update for kpatch-patch
• CentOS 6 update for kernel
• Red Hat Enterprise Linux 7 update for kernel
• Red Hat Enterprise Linux 7 update for kernel
• Red Hat Enterprise Linux 8 update for kernel
• Red Hat Enterprise Linux 7 update for kpatch-patch
• Amazon Linux AMI update for kernel
• Amazon Linux AMI update for kernel
• Multiple vulnerabilities in Juniper Junos Space
• Multiple vulnerabilities in Dell EMC Data Computing Appliance (DCA)
• Red Hat Enterprise Linux 8 update for kernel
• Red Hat Enterprise Linux 6 update for kernel
• Red Hat Enterprise Linux 7 update for kernel-alt
• Red Hat Enterprise Linux 7 update for kernel
• Red Hat Enterprise Linux 7 update for kernel-rt
• Red Hat Enterprise Linux 8.1 Extended Update Support update for kernel
• Red Hat Enterprise Linux 7.6 Extended Update Support update for kpatch-patch
• Anolis OS update for kernel(ANCK)4.19
• Ubuntu update for linux-gke-5.0
• Ubuntu update for linux
• Ubuntu update for linux
• Ubuntu update for linux
• Ubuntu update for linux
• Slackware Linux update for kernel
• Red Hat Enterprise Linux 7 update for kernel
• Fedora 32 update for kernel
• Fedora 31 update for kernel
• Fedora 30 update for kernel