Red Hat Security Advisory: kernel-rt security and bug fix update

Fixed packages 28

Vulnerabilities 5

• 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-2020-25704

  A flaw memory leak in the Linux kernel performance monitoring subsystem was found in the way if using PERF_EVENT_IOC_SE…

  linux-raspi2 linux-hwe linux-azure linux-riscv Debian Ubuntu
  Dec 2, 2020
• Unscored —
  CVE-2020-35508

  A flaw possibility of race condition and incorrect initialization of the process id was found in the Linux kernel child…

  linux-raspi2 linux-hwe linux-azure linux-riscv Debian Ubuntu Azure Linux
  Mar 26, 2021
• 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
• Unscored —
  CVE-2021-33909 Public exploit

  fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations, …

  linux-raspi2 linux-hwe linux-azure linux-riscv Debian Ubuntu Azure Linux
  Jul 20, 2021

References

• article
  https://access.redhat.com/security/updates/classification/#important
• article
  https://access.redhat.com/security/vulnerabilities/RHSB-2021-006
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=1886285
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=1895961
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=1902724
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=1961305
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=1968022
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=1970273
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_2719.json
• report
  https://access.redhat.com/security/cve/CVE-2020-25704
• advisory
  https://www.cve.org/CVERecord?id=CVE-2020-25704
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2020-25704
• article
  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7bdb157cdebbf95a1cd94ed2e01b338714075d00
• article
  https://www.openwall.com/lists/oss-security/2020/11/09/1
• 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-2020-35508
• advisory
  https://www.cve.org/CVERecord?id=CVE-2020-35508
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2020-35508
• 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
• report
  https://access.redhat.com/security/cve/CVE-2021-33909
• advisory
  https://www.cve.org/CVERecord?id=CVE-2021-33909
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2021-33909
• article
  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8cae8cd89f05f6de223d63e6d15e31c8ba9cf53b
• article
  https://www.openwall.com/lists/oss-security/2021/07/20/1
• article
  https://www.qualys.com/2021/07/20/cve-2021-33909/sequoia-local-privilege-escalation-linux.txt