Red Hat Security Advisory: kernel security and bug fix update

Fixed packages 72

Vulnerabilities 5

• Unscored —
  CVE-2019-20934

  An issue was discovered in the Linux kernel before 5.2.6. On NUMA systems, the Linux fair scheduler has a use-after-fre…

  linux-raspi2 linux-hwe linux-azure linux-riscv Debian Ubuntu
  Nov 28, 2020
• Unscored —
  CVE-2020-11668

  In the Linux kernel before 5.6.1, drivers/media/usb/gspca/xirlink_cit.c (aka the Xirlink camera USB driver) mishandles …

  linux-raspi2 linux-hwe linux-azure linux-riscv Debian Ubuntu
  Apr 9, 2020
• Unscored —
  CVE-2021-33033

  The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c because the CIPSO and …

  linux-raspi2 linux-hwe linux-azure linux-riscv Debian Ubuntu Azure Linux
  May 14, 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=1824792
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=1902788
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=1961300
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=1961305
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=1970273
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_2725.json
• report
  https://access.redhat.com/security/cve/CVE-2019-20934
• advisory
  https://www.cve.org/CVERecord?id=CVE-2019-20934
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2019-20934
• report
  https://access.redhat.com/security/cve/CVE-2020-11668
• advisory
  https://www.cve.org/CVERecord?id=CVE-2020-11668
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2020-11668
• report
  https://access.redhat.com/security/cve/CVE-2021-33033
• advisory
  https://www.cve.org/CVERecord?id=CVE-2021-33033
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2021-33033
• 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