RHSA-2023:0951HighCVSS 7.8

Red Hat Security Advisory: kernel security and bug fix update

Published
February 28, 2023
Last Modified
November 6, 2026

🔗 CVE IDs covered (7)

CVE-2022-2873 →CVE-2022-3564 →CVE-2022-4378 →CVE-2022-4379 →CVE-2022-49910 →CVE-2022-49944 →CVE-2023-0179 →

📋 Description

CVE-2022-2873 — kernel: an out-of-bounds vulnerability in i2c-ismt driver CVE-2022-3564 — kernel: use-after-free caused by l2cap_reassemble_sdu() in net/bluetooth/l2cap_core.c CVE-2022-4378 — kernel: stack overflow in do_proc_dointvec and proc_skip_spaces CVE-2022-4379 — kernel: use-after-free in __nfs42_ssc_open() in fs/nfs/nfs4file.c leading to remote Denial of Service attack CVE-2022-49910 — kernel: Bluetooth: L2CAP: Fix use-after-free caused by l2cap_reassemble_sdu CVE-2022-49944 — kernel: Revert "usb: typec: ucsi: add a common function ucsi_unregister_connectors()" CVE-2023-0179 — kernel: Netfilter integer overflow vulnerability in nft_payload_copy_vlan

🎯 Affected products169

  • Red Hat CodeReady Linux Builder (v. 9)
  • Red Hat Enterprise Linux AppStream (v. 9)
  • Red Hat Enterprise Linux BaseOS (v. 9)
  • bpftool-0:5.14.0-162.18.1.el9_1.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • bpftool-0:5.14.0-162.18.1.el9_1.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • bpftool-0:5.14.0-162.18.1.el9_1.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • bpftool-0:5.14.0-162.18.1.el9_1.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • bpftool-debuginfo-0:5.14.0-162.18.1.el9_1.aarch64 as a component of Red Hat CodeReady Linux Builder (v. 9)
  • bpftool-debuginfo-0:5.14.0-162.18.1.el9_1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • bpftool-debuginfo-0:5.14.0-162.18.1.el9_1.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • bpftool-debuginfo-0:5.14.0-162.18.1.el9_1.ppc64le as a component of Red Hat CodeReady Linux Builder (v. 9)
  • bpftool-debuginfo-0:5.14.0-162.18.1.el9_1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • bpftool-debuginfo-0:5.14.0-162.18.1.el9_1.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • bpftool-debuginfo-0:5.14.0-162.18.1.el9_1.s390x as a component of Red Hat CodeReady Linux Builder (v. 9)
  • bpftool-debuginfo-0:5.14.0-162.18.1.el9_1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • bpftool-debuginfo-0:5.14.0-162.18.1.el9_1.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • bpftool-debuginfo-0:5.14.0-162.18.1.el9_1.x86_64 as a component of Red Hat CodeReady Linux Builder (v. 9)
  • bpftool-debuginfo-0:5.14.0-162.18.1.el9_1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • bpftool-debuginfo-0:5.14.0-162.18.1.el9_1.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • kernel-0:5.14.0-162.18.1.el9_1.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • kernel-0:5.14.0-162.18.1.el9_1.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • kernel-0:5.14.0-162.18.1.el9_1.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • kernel-0:5.14.0-162.18.1.el9_1.src as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • kernel-0:5.14.0-162.18.1.el9_1.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • kernel-abi-stablelists-0:5.14.0-162.18.1.el9_1.noarch as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • kernel-core-0:5.14.0-162.18.1.el9_1.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • kernel-core-0:5.14.0-162.18.1.el9_1.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • kernel-core-0:5.14.0-162.18.1.el9_1.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • kernel-core-0:5.14.0-162.18.1.el9_1.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • kernel-debug-0:5.14.0-162.18.1.el9_1.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • +139 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Workaround: To mitigate this issue, prevent module i2c-ismt from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to blacklist a kernel module to prevent it from loading automatically. Workaround: To mitigate these vulnerabilities on the operating system level, disable the Bluetooth functionality via blocklisting kernel modules in the Linux kernel. The kernel modules can be prevented from being loaded by using system-wide modprobe rules. Instructions on how to disable Bluetooth modules are available on the Customer Portal at https://access.redhat.com/solutions/2682931. Alternatively, Bluetooth can be disabled within the hardware or at BIOS level which will also provide an effective mitigation as the kernel will not be able to detect that Bluetooth hardware is present on the system. Workaround: A possible workaround is preventing regular users from accessing sysctl files (such as /proc/sys/net/ipv4/tcp_rmem and similar). Also, preventing a user from increasing privileges with commands such as "unshare -rn" (that allows obtaining net namespace privileges required to access /proc/sys/net/ipv4/tcp_rmem). Workaround: Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. Workaround: The only way to mitigate these vulnerabilities on the operating system level is to disable the Bluetooth functionality via blacklisting kernel modules in the Linux kernel. The kernel modules can be prevented from being loaded by using system-wide modprobe rules. How to disable Bluetooth modules instructions are available on the Customer Portal at https://access.redhat.com/solutions/2682931. Alternatively, Bluetooth can be disabled within the hardware or at BIOS level, which will also provide an effective mitigation as the kernel will not be able to detect that Bluetooth hardware is present on the system. Workaround: This flaw can be mitigated by disabling unprivileged user namespaces will prevent exploitation: ~~~ sysctl -w kernel.unprivileged_userns_clone = 0 ~~~

🔗 References (8)