Out-of-bounds write in Linux kernel - CVE-2021-3491

Vulnerability identifier: #VU68301

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-3491

CWE-ID: CWE-787

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to the io_uring subsystem in the Linux kernel allowed the MAX_RW_COUNT limit to be bypassed in the PROVIDE_BUFFERS operation, which led to negative values being used in mem_rw when reading /proc/<PID>/mem. A local user can trigger a heap overflow and execute arbitrary code with elevated privileges.

Linux kernel
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Ubuntu
Fedora
kernel-livepatch-4_12_14-197_92-default
kernel-livepatch-5_3_18-24_67-default
kernel-livepatch-5_3_18-24_67-default-debuginfo
kernel-livepatch-SLE15-SP2_Update_14-debugsource
kgraft-patch-4_12_14-95_77-default
kernel-livepatch-SLE15-SP3_Update_1-debugsource
kernel-livepatch-5_3_18-59_5-default-debuginfo
kernel-livepatch-5_3_18-59_5-default
kgraft-patch-4_12_14-122_74-default
dlm-kmp-rt
ocfs2-kmp-rt-debuginfo
ocfs2-kmp-rt
kernel-syms-rt
kernel-rt_debug-devel-debuginfo
kernel-rt_debug-devel
kernel-rt_debug-debugsource
kernel-rt_debug-debuginfo
kernel-rt_debug
kernel-devel-rt
kernel-source-rt
cluster-md-kmp-rt
kernel-rt-devel-debuginfo
kernel-rt-devel
kernel-rt-debugsource
kernel-rt-debuginfo
kernel-rt-base-debuginfo
kernel-rt-base
kernel-rt
gfs2-kmp-rt-debuginfo
gfs2-kmp-rt
dlm-kmp-rt-debuginfo
cluster-md-kmp-rt-debuginfo
kernel-azure-base
kernel-azure-devel
kernel-syms-azure
kernel-devel-azure
kernel-source-azure
kernel-azure-debugsource
kernel-azure
kernel-azure-debuginfo
kernel-azure-base-debuginfo
cluster-md-kmp-default
ocfs2-kmp-default-debuginfo
ocfs2-kmp-default
gfs2-kmp-default-debuginfo
gfs2-kmp-default
dlm-kmp-default-debuginfo
dlm-kmp-default
cluster-md-kmp-default-debuginfo
kernel-default-kgraft-devel
kernel-default
kernel-default-base
kernel-default-base-debuginfo
kernel-default-debuginfo
kernel-default-debugsource
kernel-default-devel
kernel-default-devel-debuginfo
kernel-syms
kernel-devel
kernel-macros
kernel-source
kernel-default-man
kernel-default-kgraft
kernel-obs-build-debugsource
kernel-obs-build
kernel-default-extra-debuginfo
kernel-default-extra
kernel-docs
kernel-default-livepatch-devel
kernel-default-livepatch
kernel-zfcpdump-debugsource
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
kernel-zfcpdump-debuginfo
kernel-azure-devel-debuginfo
kernel-preempt-extra-debuginfo
kernel-preempt-extra
kernel-preempt-devel-debuginfo
kernel-preempt-devel
kernel-preempt-debugsource
kernel-preempt-debuginfo
kernel-preempt
kernel-64kb
kernel-64kb-debuginfo
kernel-64kb-debugsource
kernel-64kb-devel
kernel-64kb-devel-debuginfo
kernel-zfcpdump
linux-image-generic-lpae (Ubuntu package)
linux-image-virtual (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-oem-20.04 (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-generic-64k (Ubuntu package)
linux-image-5.8.0-53-generic (Ubuntu package)
linux-image-5.8.0-53-generic-64k (Ubuntu package)
linux-image-5.8.0-53-lowlatency (Ubuntu package)
linux-image-5.8.0-53-generic-lpae (Ubuntu package)
linux-image-virtual-hwe-20.04 (Ubuntu package)
linux-image-generic-64k-hwe-20.04 (Ubuntu package)
linux-image-generic-hwe-20.04 (Ubuntu package)
linux-image-generic-lpae-hwe-20.04 (Ubuntu package)
linux-image-lowlatency-hwe-20.04 (Ubuntu package)
linux-image-raspi-nolpae (Ubuntu package)
linux-image-raspi (Ubuntu package)
linux-image-5.8.0-1024-raspi-nolpae (Ubuntu package)
linux-image-5.8.0-1024-raspi (Ubuntu package)
linux-image-5.8.0-1027-kvm (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-5.8.0-1029-oracle (Ubuntu package)
linux-image-gcp (Ubuntu package)
linux-image-gke (Ubuntu package)
linux-image-5.8.0-1031-gcp (Ubuntu package)
linux-image-azure (Ubuntu package)
linux-image-5.8.0-1032-azure (Ubuntu package)
linux-image-5.8.0-1033-aws (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-oem-20.04b (Ubuntu package)
linux-image-5.10.0-1026-oem (Ubuntu package)
linux-image-5.11.0-17-generic (Ubuntu package)
linux-image-5.11.0-17-generic-64k (Ubuntu package)
linux-image-5.11.0-17-generic-lpae (Ubuntu package)
linux-image-5.11.0-17-lowlatency (Ubuntu package)
linux-image-5.11.0-1005-azure (Ubuntu package)
linux-image-5.11.0-1006-oracle (Ubuntu package)
linux-image-5.11.0-1007-aws (Ubuntu package)
linux-image-5.11.0-1007-kvm (Ubuntu package)
linux-image-5.11.0-1007-gcp (Ubuntu package)
linux-image-5.11.0-1008-raspi (Ubuntu package)
linux-image-5.11.0-1008-raspi-nolpae (Ubuntu package)
kernel
kernel-headers
kernel-tools

Install updates from vendor's website.

kernel-livepatch-4_12_14-197_92-default - update to 1-3.3.1
kernel-livepatch-5_3_18-24_67-default - update to 1-5.3.2
kernel-livepatch-5_3_18-24_67-default-debuginfo - update to 1-5.3.2
kernel-livepatch-SLE15-SP2_Update_14-debugsource - update to 1-5.3.2
kgraft-patch-4_12_14-95_77-default - update to 1-6.3.1
kernel-livepatch-SLE15-SP3_Update_1-debugsource - update to 1-7.5.1
kernel-livepatch-5_3_18-59_5-default-debuginfo - update to 1-7.5.1
kernel-livepatch-5_3_18-59_5-default - update to 1-7.5.1
kgraft-patch-4_12_14-122_74-default - update to 1-8.3.1
dlm-kmp-rt - addressed in versions 4.12.14-10.46.1, 5.3.18-8.13.1, 5.3.18-39.1
ocfs2-kmp-rt-debuginfo - addressed in versions 4.12.14-10.46.1, 5.3.18-8.13.1, 5.3.18-39.1
ocfs2-kmp-rt - addressed in versions 4.12.14-10.46.1, 5.3.18-8.13.1, 5.3.18-39.1
kernel-syms-rt - addressed in versions 4.12.14-10.46.1, 5.3.18-8.13.1, 5.3.18-39.1
kernel-rt_debug-devel-debuginfo - addressed in versions 4.12.14-10.46.1, 5.3.18-8.13.1, 5.3.18-39.1
kernel-rt_debug-devel - addressed in versions 4.12.14-10.46.1, 5.3.18-8.13.1, 5.3.18-39.1
kernel-rt_debug-debugsource - addressed in versions 4.12.14-10.46.1, 5.3.18-8.13.1, 5.3.18-39.1
kernel-rt_debug-debuginfo - addressed in versions 4.12.14-10.46.1, 5.3.18-8.13.1, 5.3.18-39.1
kernel-rt_debug - addressed in versions 4.12.14-10.46.1, 5.3.18-39.1
kernel-devel-rt - addressed in versions 4.12.14-10.46.1, 5.3.18-8.13.1, 5.3.18-39.1
kernel-source-rt - addressed in versions 4.12.14-10.46.1, 5.3.18-8.13.1, 5.3.18-39.1
cluster-md-kmp-rt - addressed in versions 4.12.14-10.46.1, 5.3.18-8.13.1, 5.3.18-39.1
kernel-rt-devel-debuginfo - addressed in versions 4.12.14-10.46.1, 5.3.18-8.13.1, 5.3.18-39.1
kernel-rt-devel - addressed in versions 4.12.14-10.46.1, 5.3.18-8.13.1, 5.3.18-39.1
kernel-rt-debugsource - addressed in versions 4.12.14-10.46.1, 5.3.18-8.13.1, 5.3.18-39.1
kernel-rt-debuginfo - addressed in versions 4.12.14-10.46.1, 5.3.18-8.13.1, 5.3.18-39.1
kernel-rt-base-debuginfo - update to 4.12.14-10.46.1
kernel-rt-base - update to 4.12.14-10.46.1
kernel-rt - addressed in versions 4.12.14-10.46.1, 5.3.18-8.13.1, 5.3.18-39.1
gfs2-kmp-rt-debuginfo - addressed in versions 4.12.14-10.46.1, 5.3.18-8.13.1, 5.3.18-39.1
gfs2-kmp-rt - addressed in versions 4.12.14-10.46.1, 5.3.18-8.13.1, 5.3.18-39.1
dlm-kmp-rt-debuginfo - addressed in versions 4.12.14-10.46.1, 5.3.18-8.13.1, 5.3.18-39.1
cluster-md-kmp-rt-debuginfo - addressed in versions 4.12.14-10.46.1, 5.3.18-8.13.1, 5.3.18-39.1
kernel-azure-base - update to 4.12.14-16.59.1
kernel-azure-devel - addressed in versions 4.12.14-16.59.1, 5.3.18-18.50.2, 5.3.18-38.3.1
kernel-syms-azure - addressed in versions 4.12.14-16.59.1, 5.3.18-18.50.1, 5.3.18-38.3.1
kernel-devel-azure - addressed in versions 4.12.14-16.59.1, 5.3.18-18.50.2, 5.3.18-38.3.1
kernel-source-azure - addressed in versions 4.12.14-16.59.1, 5.3.18-18.50.2, 5.3.18-38.3.1
kernel-azure-debugsource - addressed in versions 4.12.14-16.59.1, 5.3.18-18.50.2, 5.3.18-38.3.1
kernel-azure - addressed in versions 4.12.14-16.59.1, 5.3.18-18.50.2, 5.3.18-38.3.1
kernel-azure-debuginfo - addressed in versions 4.12.14-16.59.1, 5.3.18-18.50.2, 5.3.18-38.3.1
kernel-azure-base-debuginfo - update to 4.12.14-16.59.1
cluster-md-kmp-default - addressed in versions 4.12.14-95.77.1, 4.12.14-122.74.1, 4.12.14-197.92.1, 5.3.18-24.67.3, 5.3.18-59.5.2
ocfs2-kmp-default-debuginfo - addressed in versions 4.12.14-95.77.1, 4.12.14-122.74.1, 4.12.14-197.92.1, 5.3.18-24.67.3, 5.3.18-59.5.2
ocfs2-kmp-default - addressed in versions 4.12.14-95.77.1, 4.12.14-122.74.1, 4.12.14-197.92.1, 5.3.18-24.67.3, 5.3.18-59.5.2
gfs2-kmp-default-debuginfo - addressed in versions 4.12.14-95.77.1, 4.12.14-122.74.1, 4.12.14-197.92.1, 5.3.18-24.67.3, 5.3.18-59.5.2
gfs2-kmp-default - addressed in versions 4.12.14-95.77.1, 4.12.14-122.74.1, 4.12.14-197.92.1, 5.3.18-24.67.3, 5.3.18-59.5.2
dlm-kmp-default-debuginfo - addressed in versions 4.12.14-95.77.1, 4.12.14-122.74.1, 4.12.14-197.92.1, 5.3.18-24.67.3, 5.3.18-59.5.2
dlm-kmp-default - addressed in versions 4.12.14-95.77.1, 4.12.14-122.74.1, 4.12.14-197.92.1, 5.3.18-24.67.3, 5.3.18-59.5.2
cluster-md-kmp-default-debuginfo - addressed in versions 4.12.14-95.77.1, 4.12.14-122.74.1, 4.12.14-197.92.1, 5.3.18-24.67.3, 5.3.18-59.5.2
kernel-default-kgraft-devel - addressed in versions 4.12.14-95.77.1, 4.12.14-122.74.1
kernel-default - addressed in versions 4.12.14-95.77.1, 4.12.14-122.74.1, 4.12.14-197.92.1, 5.3.18-24.67.3, 5.3.18-59.5.2
kernel-default-base - addressed in versions 4.12.14-95.77.1, 4.12.14-122.74.1, 4.12.14-197.92.1, 5.3.18-24.67.3.9.30.2, 5.3.18-59.5.2.18.2.2
kernel-default-base-debuginfo - addressed in versions 4.12.14-95.77.1, 4.12.14-122.74.1, 4.12.14-197.92.1
kernel-default-debuginfo - addressed in versions 4.12.14-95.77.1, 4.12.14-122.74.1, 4.12.14-197.92.1, 5.3.18-24.67.3, 5.3.18-59.5.2
kernel-default-debugsource - addressed in versions 4.12.14-95.77.1, 4.12.14-122.74.1, 4.12.14-197.92.1, 5.3.18-24.67.3, 5.3.18-59.5.2
kernel-default-devel - addressed in versions 4.12.14-95.77.1, 4.12.14-122.74.1, 4.12.14-197.92.1, 5.3.18-24.67.3, 5.3.18-59.5.2
kernel-default-devel-debuginfo - addressed in versions 4.12.14-95.77.1, 4.12.14-122.74.1, 4.12.14-197.92.1, 5.3.18-24.67.3, 5.3.18-59.5.2
kernel-syms - addressed in versions 4.12.14-95.77.1, 4.12.14-122.74.1, 4.12.14-197.92.1, 5.3.18-24.67.1, 5.3.18-59.5.1
kernel-devel - addressed in versions 4.12.14-95.77.1, 4.12.14-122.74.1, 4.12.14-197.92.1, 5.3.18-24.67.2, 5.3.18-59.5.2
kernel-macros - addressed in versions 4.12.14-95.77.1, 4.12.14-122.74.1, 4.12.14-197.92.1, 5.3.18-24.67.2, 5.3.18-59.5.2
kernel-source - addressed in versions 4.12.14-95.77.1, 4.12.14-122.74.1, 4.12.14-197.92.1, 5.3.18-24.67.2, 5.3.18-59.5.2
kernel-default-man - addressed in versions 4.12.14-95.77.1, 4.12.14-122.74.1, 4.12.14-197.92.1
kernel-default-kgraft - addressed in versions 4.12.14-95.77.1, 4.12.14-122.74.1
kernel-obs-build-debugsource - addressed in versions 4.12.14-122.74.1, 4.12.14-197.92.1, 5.3.18-24.67.2, 5.3.18-59.5.1
kernel-obs-build - addressed in versions 4.12.14-122.74.1, 4.12.14-197.92.1, 5.3.18-24.67.2, 5.3.18-59.5.1
kernel-default-extra-debuginfo - addressed in versions 4.12.14-122.74.1, 5.3.18-24.67.3, 5.3.18-59.5.2
kernel-default-extra - addressed in versions 4.12.14-122.74.1, 5.3.18-24.67.3, 5.3.18-59.5.2
kernel-docs - addressed in versions 4.12.14-122.74.2, 4.12.14-197.92.1, 5.3.18-24.67.3, 5.3.18-59.5.2
kernel-default-livepatch-devel - addressed in versions 4.12.14-197.92.1, 5.3.18-24.67.3, 5.3.18-59.5.2
kernel-default-livepatch - addressed in versions 4.12.14-197.92.1, 5.3.18-24.67.3, 5.3.18-59.5.2
kernel-zfcpdump-debugsource - addressed in versions 4.12.14-197.92.1, 5.3.18-59.5.2
reiserfs-kmp-default - addressed in versions 4.12.14-197.92.1, 5.3.18-24.67.3, 5.3.18-59.5.2
reiserfs-kmp-default-debuginfo - addressed in versions 4.12.14-197.92.1, 5.3.18-24.67.3, 5.3.18-59.5.2
kernel-zfcpdump-debuginfo - addressed in versions 4.12.14-197.92.1, 5.3.18-59.5.2
kernel-azure-devel-debuginfo - addressed in versions 5.3.18-18.50.2, 5.3.18-38.3.1
kernel-preempt-extra-debuginfo - addressed in versions 5.3.18-24.67.4, 5.3.18-59.5.2
kernel-preempt-extra - addressed in versions 5.3.18-24.67.4, 5.3.18-59.5.2
kernel-preempt-devel-debuginfo - addressed in versions 5.3.18-24.67.4, 5.3.18-59.5.2
kernel-preempt-devel - addressed in versions 5.3.18-24.67.4, 5.3.18-59.5.2
kernel-preempt-debugsource - addressed in versions 5.3.18-24.67.4, 5.3.18-59.5.2
kernel-preempt-debuginfo - addressed in versions 5.3.18-24.67.4, 5.3.18-59.5.2
kernel-preempt - addressed in versions 5.3.18-24.67.4, 5.3.18-59.5.2
kernel-64kb - update to 5.3.18-59.5.2
kernel-64kb-debuginfo - update to 5.3.18-59.5.2
kernel-64kb-debugsource - update to 5.3.18-59.5.2
kernel-64kb-devel - update to 5.3.18-59.5.2
kernel-64kb-devel-debuginfo - update to 5.3.18-59.5.2
kernel-zfcpdump - update to 5.3.18-59.5.2
linux-image-generic-lpae (Ubuntu package) - addressed in versions 5.8.0.53.58, 5.11.0.17.18
linux-image-virtual (Ubuntu package) - addressed in versions 5.8.0.53.58, 5.11.0.17.18
linux-image-generic (Ubuntu package) - addressed in versions 5.8.0.53.58, 5.11.0.17.18
linux-image-oem-20.04 (Ubuntu package) - update to 5.8.0.53.58
linux-image-lowlatency (Ubuntu package) - addressed in versions 5.8.0.53.58, 5.11.0.17.18
linux-image-generic-64k (Ubuntu package) - addressed in versions 5.8.0.53.58, 5.11.0.17.18
linux-image-5.8.0-53-generic (Ubuntu package) - update to 5.8.0-53.60~20.04.1
linux-image-5.8.0-53-generic-64k (Ubuntu package) - update to 5.8.0-53.60~20.04.1
linux-image-5.8.0-53-lowlatency (Ubuntu package) - update to 5.8.0-53.60~20.04.1
linux-image-5.8.0-53-generic-lpae (Ubuntu package) - update to 5.8.0-53.60~20.04.1
linux-image-virtual-hwe-20.04 (Ubuntu package) - update to 5.8.0.53.60~20.04.37
linux-image-generic-64k-hwe-20.04 (Ubuntu package) - update to 5.8.0.53.60~20.04.37
linux-image-generic-hwe-20.04 (Ubuntu package) - update to 5.8.0.53.60~20.04.37
linux-image-generic-lpae-hwe-20.04 (Ubuntu package) - update to 5.8.0.53.60~20.04.37
linux-image-lowlatency-hwe-20.04 (Ubuntu package) - update to 5.8.0.53.60~20.04.37
linux-image-raspi-nolpae (Ubuntu package) - addressed in versions 5.8.0.1024.27, 5.11.0.1008.6
linux-image-raspi (Ubuntu package) - addressed in versions 5.8.0.1024.27, 5.11.0.1008.6
linux-image-5.8.0-1024-raspi-nolpae (Ubuntu package) - update to 5.8.0-1024.27
linux-image-5.8.0-1024-raspi (Ubuntu package) - update to 5.8.0-1024.27
linux-image-5.8.0-1027-kvm (Ubuntu package) - update to 5.8.0-1027.29
linux-image-kvm (Ubuntu package) - addressed in versions 5.8.0.1027.29, 5.11.0.1007.7
linux-image-oracle (Ubuntu package) - addressed in versions 5.8.0.1029.28, 5.11.0.1006.6
linux-image-5.8.0-1029-oracle (Ubuntu package) - update to 5.8.0-1029.30
linux-image-gcp (Ubuntu package) - addressed in versions 5.8.0.1031.31, 5.11.0.1007.7
linux-image-gke (Ubuntu package) - addressed in versions 5.8.0.1031.31, 5.11.0.1007.7
linux-image-5.8.0-1031-gcp (Ubuntu package) - update to 5.8.0-1031.32
linux-image-azure (Ubuntu package) - addressed in versions 5.8.0.1032.32, 5.11.0.1005.5
linux-image-5.8.0-1032-azure (Ubuntu package) - update to 5.8.0-1032.34
linux-image-5.8.0-1033-aws (Ubuntu package) - update to 5.8.0-1033.35
linux-image-aws (Ubuntu package) - addressed in versions 5.8.0.1033.35, 5.11.0.1007.7
linux-image-oem-20.04b (Ubuntu package) - update to 5.10.0.1026.27
linux-image-5.10.0-1026-oem (Ubuntu package) - update to 5.10.0-1026.27
linux-image-5.11.0-17-generic (Ubuntu package) - update to 5.11.0-17.18
linux-image-5.11.0-17-generic-64k (Ubuntu package) - update to 5.11.0-17.18
linux-image-5.11.0-17-generic-lpae (Ubuntu package) - update to 5.11.0-17.18
linux-image-5.11.0-17-lowlatency (Ubuntu package) - update to 5.11.0-17.18
linux-image-5.11.0-1005-azure (Ubuntu package) - update to 5.11.0-1005.5
linux-image-5.11.0-1006-oracle (Ubuntu package) - update to 5.11.0-1006.6
linux-image-5.11.0-1007-aws (Ubuntu package) - update to 5.11.0-1007.7
linux-image-5.11.0-1007-kvm (Ubuntu package) - update to 5.11.0-1007.7
linux-image-5.11.0-1007-gcp (Ubuntu package) - update to 5.11.0-1007.7
linux-image-5.11.0-1008-raspi (Ubuntu package) - update to 5.11.0-1008.8
linux-image-5.11.0-1008-raspi-nolpae (Ubuntu package) - update to 5.11.0-1008.8
kernel - addressed in versions 5.11.20-100.fc32, 5.11.20-200.fc33, 5.11.20-300.fc34
kernel-headers - addressed in versions 5.11.20-100.fc32, 5.11.20-200.fc33, 5.11.20-300.fc34
kernel-tools - addressed in versions 5.11.20-100.fc32, 5.11.20-200.fc33, 5.11.20-300.fc34

• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d1f82808877bb10d3deee7cf3374a4eb3fb582db
• https://www.zerodayinitiative.com/advisories/ZDI-21-589/
• https://www.openwall.com/lists/oss-security/2021/05/11/13
• https://security.netapp.com/advisory/ntap-20210716-0004/

• Privilege escalation in Linux kernel io_uring
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• Ubuntu update for linux
• Ubuntu update for linux
• Ubuntu update for linux-oem-5.10
• Fedora 34 update for kernel, kernel-headers, kernel-tools
• Fedora 32 update for kernel, kernel-headers, kernel-tools
• Fedora 33 update for kernel, kernel-headers, kernel-tools