# RHSA-2021:4356: Security update for 23 packages RHSA-2021:4356, released November 9, 2021, fixes 58 CVEs across 23 products. None of them is reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/fix/linux/rhsa-2021-4356 - Platform: Linux - Released: Nov 9, 2021 - Priority: High (Closes CVE-2021-31440, high severity) - CVEs: 58, exploited: 0, on CISA KEV: 0 - Vendor advisory: https://access.redhat.com/errata/RHSA-2021:4356 ## Applies to | Product | Release | Fixed in | |---|---|---| | [bpftool](https://patchblox.com/security/data/product/linux/bpftool.md) | RHEL 8 | 0:4.18.0-348.el8 | | [kernel](https://patchblox.com/security/data/product/linux/kernel.md) | RHEL 8 | 0:4.18.0-348.el8 | | [kernel-abi-stablelists](https://patchblox.com/security/data/product/linux/kernel-abi-stablelists.md) | RHEL 8 | 0:4.18.0-348.el8 | | [kernel-core](https://patchblox.com/security/data/product/linux/kernel-core.md) | RHEL 8 | 0:4.18.0-348.el8 | | [kernel-debug](https://patchblox.com/security/data/product/linux/kernel-debug.md) | RHEL 8 | 0:4.18.0-348.el8 | | [kernel-debug-core](https://patchblox.com/security/data/product/linux/kernel-debug-core.md) | RHEL 8 | 0:4.18.0-348.el8 | | [kernel-debug-devel](https://patchblox.com/security/data/product/linux/kernel-debug-devel.md) | RHEL 8 | 0:4.18.0-348.el8 | | [kernel-debug-modules](https://patchblox.com/security/data/product/linux/kernel-debug-modules.md) | RHEL 8 | 0:4.18.0-348.el8 | | [kernel-debug-modules-extra](https://patchblox.com/security/data/product/linux/kernel-debug-modules-extra.md) | RHEL 8 | 0:4.18.0-348.el8 | | [kernel-devel](https://patchblox.com/security/data/product/linux/kernel-devel.md) | RHEL 8 | 0:4.18.0-348.el8 | | [kernel-doc](https://patchblox.com/security/data/product/linux/kernel-doc.md) | RHEL 8 | 0:4.18.0-348.el8 | | [kernel-modules](https://patchblox.com/security/data/product/linux/kernel-modules.md) | RHEL 8 | 0:4.18.0-348.el8 | | [kernel-modules-extra](https://patchblox.com/security/data/product/linux/kernel-modules-extra.md) | RHEL 8 | 0:4.18.0-348.el8 | | [kernel-tools](https://patchblox.com/security/data/product/linux/kernel-tools.md) | RHEL 8 | 0:4.18.0-348.el8 | | [kernel-tools-libs](https://patchblox.com/security/data/product/linux/kernel-tools-libs.md) | RHEL 8 | 0:4.18.0-348.el8 | | [kernel-tools-libs-devel](https://patchblox.com/security/data/product/linux/kernel-tools-libs-devel.md) | RHEL 8 | 0:4.18.0-348.el8 | | [kernel-zfcpdump](https://patchblox.com/security/data/product/linux/kernel-zfcpdump.md) | RHEL 8 | 0:4.18.0-348.el8 | | [kernel-zfcpdump-core](https://patchblox.com/security/data/product/linux/kernel-zfcpdump-core.md) | RHEL 8 | 0:4.18.0-348.el8 | | [kernel-zfcpdump-devel](https://patchblox.com/security/data/product/linux/kernel-zfcpdump-devel.md) | RHEL 8 | 0:4.18.0-348.el8 | | [kernel-zfcpdump-modules](https://patchblox.com/security/data/product/linux/kernel-zfcpdump-modules.md) | RHEL 8 | 0:4.18.0-348.el8 | | [kernel-zfcpdump-modules-extra](https://patchblox.com/security/data/product/linux/kernel-zfcpdump-modules-extra.md) | RHEL 8 | 0:4.18.0-348.el8 | | [perf](https://patchblox.com/security/data/product/linux/perf.md) | RHEL 8 | 0:4.18.0-348.el8 | | [python3-perf](https://patchblox.com/security/data/product/linux/python3-perf.md) | RHEL 8 | 0:4.18.0-348.el8 | ## CVEs this fix closes | CVE | Priority | Title | CVSS | EPSS | Exploitation | |---|---|---|---:|---:|---| | [CVE-2021-31440](https://patchblox.com/security/data/cve/CVE-2021-31440.md) | High | kernel-debug-devel: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 7.0 | 0.0175 | | | [CVE-2021-3444](https://patchblox.com/security/data/cve/CVE-2021-3444.md) | High | bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 7.8 | 0.0061 | | | [CVE-2021-33033](https://patchblox.com/security/data/cve/CVE-2021-33033.md) | High | kernel-rt-devel: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 7.8 | 0.0057 | | | [CVE-2021-3489](https://patchblox.com/security/data/cve/CVE-2021-3489.md) | High | kernel-rt-debug-modules-extra: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 7.8 | 0.0055 | | | [CVE-2020-36386](https://patchblox.com/security/data/cve/CVE-2020-36386.md) | High | kernel-zfcpdump: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 7.1 | 0.0055 | | | [CVE-2021-23133](https://patchblox.com/security/data/cve/CVE-2021-23133.md) | High | kernel-rt-debug-kvm: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 7.0 | 0.0048 | | | [CVE-2021-29657](https://patchblox.com/security/data/cve/CVE-2021-29657.md) | High | bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 7.8 | 0.0042 | | | [CVE-2021-20194](https://patchblox.com/security/data/cve/CVE-2021-20194.md) | High | kernel-tools-libs-devel: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 7.8 | 0.0040 | | | [CVE-2021-33200](https://patchblox.com/security/data/cve/CVE-2021-33200.md) | High | bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 7.8 | 0.0038 | | | [CVE-2020-29368](https://patchblox.com/security/data/cve/CVE-2020-29368.md) | High | kernel-abi-stablelists: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 7.0 | 0.0037 | | | [CVE-2021-3600](https://patchblox.com/security/data/cve/CVE-2021-3600.md) | High | kernel-rt-debug-devel: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 7.8 | 0.0028 | | | [CVE-2021-3348](https://patchblox.com/security/data/cve/CVE-2021-3348.md) | High | bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 7.0 | 0.0026 | | | [CVE-2021-47011](https://patchblox.com/security/data/cve/CVE-2021-47011.md) | High | kernel-zfcpdump-modules: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 7.1 | 0.0025 | | | [CVE-2021-47226](https://patchblox.com/security/data/cve/CVE-2021-47226.md) | High | bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 7.1 | 0.0022 | | | [CVE-2020-26147](https://patchblox.com/security/data/cve/CVE-2020-26147.md) | Routine | kernel-rt-modules: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 5.4 | 0.0760 | | | [CVE-2020-26139](https://patchblox.com/security/data/cve/CVE-2020-26139.md) | Routine | kernel-rt-kvm: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 5.3 | 0.0649 | | | [CVE-2020-24586](https://patchblox.com/security/data/cve/CVE-2020-24586.md) | Routine | kernel-rt-modules: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 4.3 | 0.0577 | | | [CVE-2020-26146](https://patchblox.com/security/data/cve/CVE-2020-26146.md) | Routine | bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 5.3 | 0.0562 | | | [CVE-2020-26144](https://patchblox.com/security/data/cve/CVE-2020-26144.md) | Routine | Windows Wireless Networking Spoofing Vulnerability | 6.5 | 0.0491 | | | [CVE-2020-26143](https://patchblox.com/security/data/cve/CVE-2020-26143.md) | Routine | kernel-rt-kvm: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 6.5 | 0.0417 | | | [CVE-2020-24588](https://patchblox.com/security/data/cve/CVE-2020-24588.md) | Routine | Windows Wireless Networking Spoofing Vulnerability | 6.5 | 0.0361 | | | [CVE-2020-26145](https://patchblox.com/security/data/cve/CVE-2020-26145.md) | Routine | kernel-modules: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 6.5 | 0.0352 | | | [CVE-2020-26141](https://patchblox.com/security/data/cve/CVE-2020-26141.md) | Routine | kernel-rt-kvm: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 6.5 | 0.0307 | | | [CVE-2020-26140](https://patchblox.com/security/data/cve/CVE-2020-26140.md) | Routine | kernel-rt-kvm: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 6.5 | 0.0292 | | | [CVE-2020-24587](https://patchblox.com/security/data/cve/CVE-2020-24587.md) | Routine | Windows Wireless Networking Information Disclosure Vulnerability | 6.5 | 0.0259 | | | [CVE-2020-36158](https://patchblox.com/security/data/cve/CVE-2020-36158.md) | Routine | kernel-devel: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 6.7 | 0.0231 | | | [CVE-2019-14615](https://patchblox.com/security/data/cve/CVE-2019-14615.md) | Routine | kernel-rt: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 5.5 | 0.0146 | | | [CVE-2019-15794](https://patchblox.com/security/data/cve/CVE-2019-15794.md) | Routine | kernel-abi-stablelists: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 6.7 | 0.0116 | | | [CVE-2021-29155](https://patchblox.com/security/data/cve/CVE-2021-29155.md) | Routine | kernel-debug-modules: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 5.5 | 0.0107 | | | [CVE-2021-0129](https://patchblox.com/security/data/cve/CVE-2021-0129.md) | Routine | kernel-modules: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 5.7 | 0.0083 | | | [CVE-2021-3679](https://patchblox.com/security/data/cve/CVE-2021-3679.md) | Routine | kernel-modules: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 5.5 | 0.0075 | | | [CVE-2021-31916](https://patchblox.com/security/data/cve/CVE-2021-31916.md) | Routine | kernel-doc: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 6.7 | 0.0070 | | | [CVE-2021-46983](https://patchblox.com/security/data/cve/CVE-2021-46983.md) | Routine | bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 5.5 | 0.0063 | | | [CVE-2020-0427](https://patchblox.com/security/data/cve/CVE-2020-0427.md) | Routine | kernel-rt: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 5.5 | 0.0049 | | | [CVE-2021-3564](https://patchblox.com/security/data/cve/CVE-2021-3564.md) | Routine | bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 6.3 | 0.0049 | | | [CVE-2020-27777](https://patchblox.com/security/data/cve/CVE-2020-27777.md) | Routine | bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 6.7 | 0.0048 | | | [CVE-2020-29660](https://patchblox.com/security/data/cve/CVE-2020-29660.md) | Routine | kernel-debug-modules-extra: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 4.4 | 0.0047 | | | [CVE-2021-29650](https://patchblox.com/security/data/cve/CVE-2021-29650.md) | Routine | bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 5.5 | 0.0041 | | | [CVE-2021-4442](https://patchblox.com/security/data/cve/CVE-2021-4442.md) | Routine | kernel-zfcpdump-modules: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 5.5 | 0.0039 | | | [CVE-2021-28971](https://patchblox.com/security/data/cve/CVE-2021-28971.md) | Routine | kernel-rt: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 5.5 | 0.0039 | | | [CVE-2021-3573](https://patchblox.com/security/data/cve/CVE-2021-3573.md) | Routine | bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 6.7 | 0.0037 | | | [CVE-2021-28950](https://patchblox.com/security/data/cve/CVE-2021-28950.md) | Routine | kernel-rt: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 5.5 | 0.0036 | | | [CVE-2021-3732](https://patchblox.com/security/data/cve/CVE-2021-3732.md) | Routine | kernel-tools-libs-devel: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 5.5 | 0.0035 | | | [CVE-2020-24503](https://patchblox.com/security/data/cve/CVE-2020-24503.md) | Routine | kernel-rt-modules: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 5.5 | 0.0035 | | | [CVE-2021-31829](https://patchblox.com/security/data/cve/CVE-2021-31829.md) | Routine | kernel-rt: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 6.2 | 0.0031 | | | [CVE-2020-36312](https://patchblox.com/security/data/cve/CVE-2020-36312.md) | Routine | kernel-devel: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 3.3 | 0.0031 | | | [CVE-2020-24502](https://patchblox.com/security/data/cve/CVE-2020-24502.md) | Routine | kernel-rt-modules: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 5.5 | 0.0031 | | | [CVE-2021-29646](https://patchblox.com/security/data/cve/CVE-2021-29646.md) | Routine | kernel-debug-modules: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 5.5 | 0.0031 | | | [CVE-2021-33098](https://patchblox.com/security/data/cve/CVE-2021-33098.md) | Routine | bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 5.5 | 0.0031 | | | [CVE-2020-24504](https://patchblox.com/security/data/cve/CVE-2020-24504.md) | Routine | kernel-rt-debug-modules: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 5.5 | 0.0030 | | | [CVE-2021-3659](https://patchblox.com/security/data/cve/CVE-2021-3659.md) | Routine | bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 5.5 | 0.0027 | | | [CVE-2021-46905](https://patchblox.com/security/data/cve/CVE-2021-46905.md) | Routine | kernel-modules: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 5.5 | 0.0026 | | | [CVE-2021-20239](https://patchblox.com/security/data/cve/CVE-2021-20239.md) | Routine | kernel-rt: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 3.8 | 0.0026 | | | [CVE-2022-50042](https://patchblox.com/security/data/cve/CVE-2022-50042.md) | Routine | kernel-modules: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 5.5 | 0.0025 | | | [CVE-2021-3635](https://patchblox.com/security/data/cve/CVE-2021-3635.md) | Routine | kernel-rt: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 4.4 | 0.0025 | | | [CVE-2021-47080](https://patchblox.com/security/data/cve/CVE-2021-47080.md) | Routine | kernel-modules: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: ou... | 5.5 | 0.0023 | | | [CVE-2022-50073](https://patchblox.com/security/data/cve/CVE-2022-50073.md) | Routine | net: tap: NULL pointer derefence in dev_parse_header_protocol when skb->dev is null | 6.5 | 0.0021 | | | [CVE-2022-20166](https://patchblox.com/security/data/cve/CVE-2022-20166.md) | Routine | kernel-rt-debug-devel: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 6.7 | 0.0016 | | --- Data as of 2026-11-07T12:40:37Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo