RHSA-2021:2726: Red Hat Security Advisory: kernel-rt security and bug fix update

An update for kernel-rt is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix(es):

• kernel: size_t-to-int conversion vulnerability in the filesystem layer (CVE-2021-33909)
• kernel: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan (CVE-2021-33034)
• kernel: use-after-free in show_numa_stats function (CVE-2019-20934)
• kernel: mishandles invalid descriptors in drivers/media/usb/gspca/xirlink_cit.c (CVE-2020-11668)
• kernel: use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c (CVE-2021-33033) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Bug Fix(es):
• kernel-rt: update to the latest RHEL7.9.z7 source tree (BZ#1967333) Related CVEs:
• CVE-2019-20934: kernel: use-after-free in show_numa_stats function
• CVE-2020-11668: kernel: mishandles invalid descriptors in drivers/media/usb/gspca/xirlink_cit.c
• CVE-2021-33033: kernel: use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c
• CVE-2021-33034: kernel: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan
• CVE-2021-33909: kernel: size_t-to-int conversion vulnerability in the filesystem layer