Null pointer dereference in Linux kernel - CVE-2021-38200

Vulnerability identifier: #VU92757

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-38200

CWE-ID: CWE-476

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to perform a denial of service (DoS) attack.

arch/powerpc/perf/core-book3s.c in the Linux kernel before 5.12.13, on systems with perf_event_paranoid=-1 and no specific PMU driver support registered, allows local users to cause a denial of service (perf_instruction_pointer NULL pointer dereference and OOPS) via a 'perf record' command.

Linux kernel
Ubuntu
linux-image-virtual (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-generic-64k (Ubuntu package)
linux-image-generic-lpae (Ubuntu package)
linux-image-oem-20.04 (Ubuntu package)
linux-image-5.11.0-34-lowlatency (Ubuntu package)
linux-image-5.11.0-34-generic (Ubuntu package)
linux-image-5.11.0-34-generic-lpae (Ubuntu package)
linux-image-5.11.0-34-generic-64k (Ubuntu package)
linux-image-virtual-hwe-20.04 (Ubuntu package)
linux-image-generic-64k-hwe-20.04 (Ubuntu package)
linux-image-generic-lpae-hwe-20.04 (Ubuntu package)
linux-image-generic-hwe-20.04 (Ubuntu package)
linux-image-lowlatency-hwe-20.04 (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-azure (Ubuntu package)
linux-image-5.11.0-1015-kvm (Ubuntu package)
linux-image-5.11.0-1015-azure (Ubuntu package)
linux-image-raspi (Ubuntu package)
linux-image-raspi-nolpae (Ubuntu package)
linux-image-5.11.0-1017-raspi-nolpae (Ubuntu package)
linux-image-5.11.0-1017-raspi (Ubuntu package)
linux-image-5.11.0-1017-oracle (Ubuntu package)
linux-image-5.11.0-1017-aws (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-gcp (Ubuntu package)
linux-image-gke (Ubuntu package)
linux-image-5.11.0-1018-gcp (Ubuntu package)

Install update from vendor's repository.

linux-image-virtual (Ubuntu package) - update to 5.11.0.34.36
linux-image-generic (Ubuntu package) - update to 5.11.0.34.36
linux-image-lowlatency (Ubuntu package) - update to 5.11.0.34.36
linux-image-generic-64k (Ubuntu package) - update to 5.11.0.34.36
linux-image-generic-lpae (Ubuntu package) - update to 5.11.0.34.36
linux-image-oem-20.04 (Ubuntu package) - update to 5.11.0.34.36
linux-image-5.11.0-34-lowlatency (Ubuntu package) - update to 5.11.0-34.36~20.04.1
linux-image-5.11.0-34-generic (Ubuntu package) - update to 5.11.0-34.36~20.04.1
linux-image-5.11.0-34-generic-lpae (Ubuntu package) - update to 5.11.0-34.36~20.04.1
linux-image-5.11.0-34-generic-64k (Ubuntu package) - update to 5.11.0-34.36~20.04.1
linux-image-virtual-hwe-20.04 (Ubuntu package) - update to 5.11.0.34.36~20.04.13
linux-image-generic-64k-hwe-20.04 (Ubuntu package) - update to 5.11.0.34.36~20.04.13
linux-image-generic-lpae-hwe-20.04 (Ubuntu package) - update to 5.11.0.34.36~20.04.13
linux-image-generic-hwe-20.04 (Ubuntu package) - update to 5.11.0.34.36~20.04.13
linux-image-lowlatency-hwe-20.04 (Ubuntu package) - update to 5.11.0.34.36~20.04.13
linux-image-kvm (Ubuntu package) - update to 5.11.0.1015.16
linux-image-azure (Ubuntu package) - update to 5.11.0.1015.16
linux-image-5.11.0-1015-kvm (Ubuntu package) - update to 5.11.0-1015.16
linux-image-5.11.0-1015-azure (Ubuntu package) - update to 5.11.0-1015.16~20.04.1
linux-image-raspi (Ubuntu package) - update to 5.11.0.1017.15
linux-image-raspi-nolpae (Ubuntu package) - update to 5.11.0.1017.15
linux-image-5.11.0-1017-raspi-nolpae (Ubuntu package) - update to 5.11.0-1017.18
linux-image-5.11.0-1017-raspi (Ubuntu package) - update to 5.11.0-1017.18
linux-image-5.11.0-1017-oracle (Ubuntu package) - update to 5.11.0-1017.18~20.04.1
linux-image-5.11.0-1017-aws (Ubuntu package) - update to 5.11.0-1017.18~20.04.1
linux-image-oracle (Ubuntu package) - update to 5.11.0.1017.18~20.04.10
linux-image-aws (Ubuntu package) - update to 5.11.0.1017.18~20.04.16
linux-image-gcp (Ubuntu package) - update to 5.11.0.1018.18
linux-image-gke (Ubuntu package) - update to 5.11.0.1018.18
linux-image-5.11.0-1018-gcp (Ubuntu package) - update to 5.11.0-1018.20

• https://github.com/torvalds/linux/commit/60b7ed54a41b550d50caf7f2418db4a7e75b5bdc
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.13

• Null pointer dereference in Linux kernel
• Ubuntu update for linux