Red Hat Security Advisory: RHV-H security update (redhat-virtualization-host) 4.3.18

Fixed packages 2

Vulnerabilities 5

• High 8.3
  CVE-2021-22555 Exploited Public exploit EPSS 79%

  Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE

  A heap out-of-bounds write affecting Linux since v2.6.19-rc1 was discovered in net/netfilter/x_tables.c. This allows an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name space

  linux-raspi2 linux-hwe linux-azure linux-riscv Linux Debian Ubuntu
  Jul 7, 2021

  KEV Oct 6, 2025
• Unscored —
  CVE-2021-31535 EPSS 10%

  LookupCol.c in X.Org X through X11R7.7 and libX11 before 1.7.1 might allow remote attackers to execute arbitrary code. …

  libx11 libx11 libx11 Debian Ubuntu Alpine
  May 27, 2021
• Unscored —
  CVE-2021-32399 Public exploit

  net/bluetooth/hci_request.c in the Linux kernel through 5.12.2 has a race condition for removal of the HCI controller.

  linux-raspi2 linux-hwe linux-azure linux-riscv Debian Ubuntu Azure Linux
  May 10, 2021
• Unscored —
  CVE-2021-3621

  A flaw was found in SSSD, where the sssctl command was vulnerable to shell command injection via the logs-fetch and cac…

  sssd sssd Debian Ubuntu
  Dec 23, 2021
• Unscored —
  CVE-2021-3715

  A flaw was found in the "Routing decision" classifier in the Linux kernel's Traffic Control networking subsystem in the…

  linux-raspi2 linux-hwe linux-azure linux-riscv Debian Ubuntu
  Mar 2, 2022

References

• article
  https://access.redhat.com/security/updates/classification/#important
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=1961822
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=1970807
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=1975142
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=1980101
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=1993988
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_3477.json
• report
  https://access.redhat.com/security/cve/CVE-2021-3621
• advisory
  https://www.cve.org/CVERecord?id=CVE-2021-3621
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2021-3621
• report
  https://access.redhat.com/security/cve/CVE-2021-3715
• advisory
  https://www.cve.org/CVERecord?id=CVE-2021-3715
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2021-3715
• article
  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ef299cc3fa1a9e1288665a9fdc8bff55629fd359
• report
  https://access.redhat.com/security/cve/CVE-2021-22555
• advisory
  https://www.cve.org/CVERecord?id=CVE-2021-22555
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2021-22555
• article
  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=b29c457a6511435960115c0f548c4360d5f4801d
• article
  https://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528
• article
  https://www.cisa.gov/known-exploited-vulnerabilities-catalog
• report
  https://access.redhat.com/security/cve/CVE-2021-31535
• advisory
  https://www.cve.org/CVERecord?id=CVE-2021-31535
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2021-31535
• article
  https://unparalleled.eu/blog/2021/20210518-using-xterm-to-navigate-the-huge-color-space/
• article
  https://unparalleled.eu/publications/2021/advisory-unpar-2021-1.txt
• report
  https://access.redhat.com/security/cve/CVE-2021-32399
• advisory
  https://www.cve.org/CVERecord?id=CVE-2021-32399
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2021-32399