This is a CVE-2020-12351 regression that only affects Red Hat Enterprise Linux 8.3 GA kernel version kernel-4.18.0-240.el8 (and any kernel derived from this release such as kernel rt-4.18.0-240.rt7.54.el8). CVE-2020-12351 description follows: A flaw was found in the way the Linux kernel Bluetooth implementation handled L2CAP packets with A2MP CID. A remote attacker in adjacent range could use this flaw to crash the system causing denial of service or potentially execute arbitrary code on the system by sending a specially crafted L2CAP packet.
Statement: This issue only affects the Linux kernel version as shipped with the Red Hat Enterprise Linux 8.3 GA release, kernel-4.18.0-240.el8 (and any kernel derived from this release such as kernel rt-4.18.0-240.rt7.54.el8). Red Hat was unable to include the fix for the original CVE-2020-12351 issue in the GA release, as the Red Hat Enterprise Linux 8.3 GA release was in its final stages of release preparation when CVE-2020-12351 was made public. All of the subsequent Red Hat Enterprise Linux 8 kernel versions, including the version included in the so-called 0day (released on the same day or very close to that day) erratum, contain the fix, thus immune to the original CVE-2020-12351 issue.
External References: https://access.redhat.com/security/cve/CVE-2020-12351 https://access.redhat.com/security/vulnerabilities/BleedingTooth
Mitigation: 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.
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2020-25661
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2020:4686 https://access.redhat.com/errata/RHSA-2020:4686
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2020:4685 https://access.redhat.com/errata/RHSA-2020:4685