Red Hat Security Advisory: kernel security and bug fix update

Fixed packages 59

Vulnerabilities 4

• 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
• High 7.8
  CVE-2021-3347 Public exploit

  An issue was discovered in the Linux kernel through 5.10.11. PI futexes have a kernel stack use-after-free during fault…

  linux-raspi2 linux-hwe linux-azure linux-riscv Debian Ubuntu
  Jan 29, 2021
• Unscored —
  CVE-2020-8648

  There is a use-after-free vulnerability in the Linux kernel through 5.5.2 in the n_tty_receive_buf_common function in d…

  linux-raspi2 linux-hwe linux-azure linux-riscv Debian Ubuntu
  Feb 6, 2020
• 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

References

• article
  https://access.redhat.com/security/updates/classification/#important
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=1802559
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=1922249
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=1970807
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=1980101
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_3522.json
• report
  https://access.redhat.com/security/cve/CVE-2020-8648
• advisory
  https://www.cve.org/CVERecord?id=CVE-2020-8648
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2020-8648
• report
  https://access.redhat.com/security/cve/CVE-2021-3347
• advisory
  https://www.cve.org/CVERecord?id=CVE-2021-3347
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2021-3347
• 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-2021-32399
• advisory
  https://www.cve.org/CVERecord?id=CVE-2021-32399
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2021-32399