Red Hat Security Advisory: kernel security and bug fix update

Fixed packages 43

Vulnerabilities 2

• Medium 6.5
  CVE-2020-26541

  The Linux kernel through 5.8.13 does not properly enforce the Secure Boot Forbidden Signature Database (aka dbx) protec…

  linux-raspi2 linux-hwe linux-azure linux-riscv Debian Ubuntu
  Oct 2, 2020
• Unscored —
  CVE-2021-33034 Public exploit

  In the Linux kernel before 5.12.4, net/bluetooth/hci_event.c has a use-after-free when destroying an hci_chan, aka CID-…

  linux-raspi2 linux-hwe linux-azure linux-riscv Debian Ubuntu Azure Linux
  May 14, 2021

References

• article
  https://access.redhat.com/security/updates/classification/#important
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=1886285
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=1961305
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_2666.json
• report
  https://access.redhat.com/security/cve/CVE-2020-26541
• advisory
  https://www.cve.org/CVERecord?id=CVE-2020-26541
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2020-26541
• report
  https://access.redhat.com/security/cve/CVE-2021-33034
• advisory
  https://www.cve.org/CVERecord?id=CVE-2021-33034
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2021-33034
• article
  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5c4c8c9544099bb9043a10a5318130a943e32fc3
• article
  https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-hci_send_acl
• article
  https://syzkaller.appspot.com/bug?id=2e1943a94647f7732dd6fc60368642d6e8dc91b1