QID 239543

Date Published: 2021-08-16

QID 239543: Red Hat Update for kernel-rt (RHSA-2021:3088)

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es): kernel: race condition in net/can/bcm.c leads to local privilege escalation (CVE-2021-3609) kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks (CVE-2021-22543) kernel: out-of-bounds write in xt_compat_target_from_user()
in net/netfilter/x_tables.c (CVE-2021-22555)

Affected Products:

Red Hat Enterprise Linux for Real Time 8 x86_64
Red Hat Enterprise Linux for Real Time for NFV 8 x86_64
Red Hat Enterprise Linux for Real Time - Telecommunications Update Service 8.4 x86_64
Red Hat Enterprise Linux for Real Time for NFV - Telecommunications Update Service 8.4 x86_64

Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

On successful exploitation, it could allow an attacker to execute code.

  • CVSS V3 rated as High - 7.8 severity.
  • CVSS V2 rated as Medium - 4.6 severity.
    • Solution
    Upgrade to the latest packages which contain a patch. Refer to Applying Package Updates to RHEL system for details.

    Refer to Red Hat security advisory RHSA-2021:3088 to address this issue and obtain more information.

    Vendor References

    CVEs related to QID 239543

    CVE-2021-3609 | CVE-2021-22543 | CVE-2021-22555 |
    Software Advisories
    Advisory ID Software Component Link
    RHSA-2021:3088 Red Hat Enterprise Linux URL Logo access.redhat.com/errata/RHSA-2021:3088?language=en
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