QID 239524

Date Published: 2021-07-29

QID 239524: Red Hat Update for kernel (RHSA-2021:2725)

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es): kernel: size_t-to-int conversion vulnerability in the filesystem layer (CVE-2021-33909) kernel: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan (CVE-2021-33034) kernel: use-after-free in show_numa_stats function (CVE-2019-20934) kernel: mishandles invalid descriptors in drivers/media/usb/gspca/xirlink_cit.c (CVE-2020-11668) kernel: use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c (CVE-2021-33033)

Affected Products:

Red Hat Enterprise Linux Server 7 x86_64
Red Hat Enterprise Linux Workstation 7 x86_64
Red Hat Enterprise Linux Desktop 7 x86_64
Red Hat Enterprise Linux for IBM z Systems 7 s390x
Red Hat Enterprise Linux for Power, big endian 7 ppc64
Red Hat Enterprise Linux for Scientific Computing 7 x86_64
Red Hat Enterprise Linux for Power, little endian 7 ppc64le
Red Hat Virtualization Host 4 for RHEL 7 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 High - 7.2 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-2021:2725 to address this issue and obtain more information.

    Vendor References

    CVEs related to QID 239524

    CVE-2019-20934 | CVE-2020-11668 | CVE-2021-33033 | CVE-2021-33034 | CVE-2021-33909 |
    Software Advisories
    Advisory ID Software Component Link
    RHSA-2021:2725 Red Hat Enterprise Linux URL Logo access.redhat.com/errata/RHSA-2021:2725?language=en
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