RHSA-2021:2168HighCVSS 7.8

Red Hat Security Advisory: kernel security and bug fix update

Published
June 1, 2021
Last Modified
August 5, 2026

🔗 CVE IDs covered (2)

CVE-2021-3501 →CVE-2021-3543 →

📋 Description

CVE-2021-3501 — kernel: userspace applications can misuse the KVM API to cause a write of 16 bytes at an offset up to 32 GB from vcpu->run CVE-2021-3543 — kernel: nitro_enclaves stale file descriptors on failed usercopy

🎯 Affected products122

  • Red Hat CodeReady Linux Builder (v. 8)
  • Red Hat Enterprise Linux BaseOS (v. 8)
  • bpftool-0:4.18.0-305.3.1.el8_4.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • bpftool-0:4.18.0-305.3.1.el8_4.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • bpftool-0:4.18.0-305.3.1.el8_4.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • bpftool-0:4.18.0-305.3.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • bpftool-debuginfo-0:4.18.0-305.3.1.el8_4.aarch64 as a component of Red Hat CodeReady Linux Builder (v. 8)
  • bpftool-debuginfo-0:4.18.0-305.3.1.el8_4.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • bpftool-debuginfo-0:4.18.0-305.3.1.el8_4.ppc64le as a component of Red Hat CodeReady Linux Builder (v. 8)
  • bpftool-debuginfo-0:4.18.0-305.3.1.el8_4.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • bpftool-debuginfo-0:4.18.0-305.3.1.el8_4.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • bpftool-debuginfo-0:4.18.0-305.3.1.el8_4.x86_64 as a component of Red Hat CodeReady Linux Builder (v. 8)
  • bpftool-debuginfo-0:4.18.0-305.3.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-0:4.18.0-305.3.1.el8_4.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-0:4.18.0-305.3.1.el8_4.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-0:4.18.0-305.3.1.el8_4.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-0:4.18.0-305.3.1.el8_4.src as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-0:4.18.0-305.3.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-abi-stablelists-0:4.18.0-305.3.1.el8_4.noarch as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-core-0:4.18.0-305.3.1.el8_4.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-core-0:4.18.0-305.3.1.el8_4.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-core-0:4.18.0-305.3.1.el8_4.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-core-0:4.18.0-305.3.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-debug-0:4.18.0-305.3.1.el8_4.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-debug-0:4.18.0-305.3.1.el8_4.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-debug-0:4.18.0-305.3.1.el8_4.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-debug-0:4.18.0-305.3.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-debug-core-0:4.18.0-305.3.1.el8_4.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-debug-core-0:4.18.0-305.3.1.el8_4.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-debug-core-0:4.18.0-305.3.1.el8_4.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • +92 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Workaround: Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.

🔗 References (5)