Out-of-bounds read in Linux kernel - CVE-2022-47940

Vulnerability identifier: #VU70485

CSH Severity: Medium

CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2022-47940

CWE-ID: CWE-125

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote user to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in smb2_write in fs/ksmbd/smb2pdu.c. A remote user can trigger an out-of-bounds read error and read contents of memory on the system.

Linux kernel
Ubuntu
openEuler
kernel
kernel-debuginfo
kernel-headers
python3-perf-debuginfo
kernel-source
bpftool-debuginfo
perf-debuginfo
kernel-tools-devel
bpftool
kernel-tools
python3-perf
perf
kernel-debugsource
kernel-devel
kernel-tools-debuginfo
linux-image-lowlatency-64k-hwe-22.04 (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-lowlatency-hwe-22.04 (Ubuntu package)
linux-image-lowlatency-64k (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-virtual (Ubuntu package)
linux-image-virtual-hwe-22.04 (Ubuntu package)
linux-image-generic-64k (Ubuntu package)
linux-image-generic-hwe-22.04 (Ubuntu package)
linux-image-generic-lpae-hwe-22.04 (Ubuntu package)
linux-image-generic-lpae (Ubuntu package)
linux-image-generic-64k-hwe-22.04 (Ubuntu package)
linux-image-5.15.0-60-lowlatency-64k (Ubuntu package)
linux-image-5.15.0-60-lowlatency (Ubuntu package)
linux-image-5.15.0-60-generic-64k (Ubuntu package)
linux-image-5.15.0-60-generic (Ubuntu package)
linux-image-5.15.0-60-generic-lpae (Ubuntu package)
linux-image-lowlatency-64k-hwe-20.04 (Ubuntu package)
linux-image-lowlatency-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-virtual-hwe-20.04 (Ubuntu package)
linux-image-gkeop (Ubuntu package)
linux-image-gkeop-5.15 (Ubuntu package)
linux-image-5.15.0-1015-gkeop (Ubuntu package)
linux-image-raspi (Ubuntu package)
linux-image-raspi-nolpae (Ubuntu package)
linux-image-5.15.0-1024-raspi-nolpae (Ubuntu package)
linux-image-5.15.0-1024-raspi (Ubuntu package)
linux-image-ibm (Ubuntu package)
linux-image-5.15.0-1025-ibm (Ubuntu package)
linux-image-5.15.0-1025-intel-iotg (Ubuntu package)
linux-image-gke-5.15 (Ubuntu package)
linux-image-gke (Ubuntu package)
linux-image-5.15.0-1027-gke (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-5.15.0-1028-kvm (Ubuntu package)
linux-image-gcp (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-5.15.0-1029-oracle (Ubuntu package)
linux-image-5.15.0-1029-gcp (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-aws-lts-22.04 (Ubuntu package)
linux-image-5.15.0-1030-aws (Ubuntu package)
linux-image-azure (Ubuntu package)
linux-image-azure-lts-22.04 (Ubuntu package)
linux-image-5.15.0-1033-azure-fde (Ubuntu package)
linux-image-azure-fde (Ubuntu package)
linux-image-5.15.0-1033-azure (Ubuntu package)
linux-image-intel-iotg (Ubuntu package)

Install updates from vendor's website.

Linux kernel - update to 5.18.18
kernel - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
kernel-debuginfo - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
kernel-headers - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
python3-perf-debuginfo - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
kernel-source - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
bpftool-debuginfo - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
perf-debuginfo - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
kernel-tools-devel - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
bpftool - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
kernel-tools - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
python3-perf - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
perf - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
kernel-debugsource - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
kernel-devel - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
kernel-tools-debuginfo - addressed in versions 5.10.0-60.77.0.101, 5.10.0-136.14.2.90
linux-image-lowlatency-64k-hwe-22.04 (Ubuntu package) - update to 5.15.0.60.53
linux-image-lowlatency (Ubuntu package) - update to 5.15.0.60.53
linux-image-lowlatency-hwe-22.04 (Ubuntu package) - update to 5.15.0.60.53
linux-image-lowlatency-64k (Ubuntu package) - update to 5.15.0.60.53
linux-image-generic (Ubuntu package) - update to 5.15.0.60.58
linux-image-virtual (Ubuntu package) - update to 5.15.0.60.58
linux-image-virtual-hwe-22.04 (Ubuntu package) - update to 5.15.0.60.58
linux-image-generic-64k (Ubuntu package) - update to 5.15.0.60.58
linux-image-generic-hwe-22.04 (Ubuntu package) - update to 5.15.0.60.58
linux-image-generic-lpae-hwe-22.04 (Ubuntu package) - update to 5.15.0.60.58
linux-image-generic-lpae (Ubuntu package) - update to 5.15.0.60.58
linux-image-generic-64k-hwe-22.04 (Ubuntu package) - update to 5.15.0.60.58
linux-image-5.15.0-60-lowlatency-64k (Ubuntu package) - update to 5.15.0-60.66~20.04.1
linux-image-5.15.0-60-lowlatency (Ubuntu package) - update to 5.15.0-60.66~20.04.1
linux-image-5.15.0-60-generic-64k (Ubuntu package) - update to 5.15.0-60.66~20.04.1
linux-image-5.15.0-60-generic (Ubuntu package) - update to 5.15.0-60.66~20.04.1
linux-image-5.15.0-60-generic-lpae (Ubuntu package) - update to 5.15.0-60.66~20.04.1
linux-image-lowlatency-64k-hwe-20.04 (Ubuntu package) - update to 5.15.0.60.66~20.04.23
linux-image-lowlatency-hwe-20.04 (Ubuntu package) - update to 5.15.0.60.66~20.04.23
linux-image-generic-64k-hwe-20.04 (Ubuntu package) - update to 5.15.0.60.66~20.04.26
linux-image-generic-lpae-hwe-20.04 (Ubuntu package) - update to 5.15.0.60.66~20.04.26
linux-image-generic-hwe-20.04 (Ubuntu package) - update to 5.15.0.60.66~20.04.26
linux-image-virtual-hwe-20.04 (Ubuntu package) - update to 5.15.0.60.66~20.04.26
linux-image-gkeop (Ubuntu package) - update to 5.15.0.1015.14
linux-image-gkeop-5.15 (Ubuntu package) - update to 5.15.0.1015.14
linux-image-5.15.0-1015-gkeop (Ubuntu package) - update to 5.15.0-1015.19
linux-image-raspi (Ubuntu package) - update to 5.15.0.1024.21
linux-image-raspi-nolpae (Ubuntu package) - update to 5.15.0.1024.21
linux-image-5.15.0-1024-raspi-nolpae (Ubuntu package) - update to 5.15.0-1024.26
linux-image-5.15.0-1024-raspi (Ubuntu package) - update to 5.15.0-1024.26
linux-image-ibm (Ubuntu package) - update to 5.15.0.1025.21
linux-image-intel-iotg (Ubuntu package) - update to 5.15.0.1025.24
linux-image-5.15.0-1025-ibm (Ubuntu package) - update to 5.15.0-1025.28
linux-image-5.15.0-1025-intel-iotg (Ubuntu package) - update to 5.15.0-1025.30
linux-image-gke-5.15 (Ubuntu package) - addressed in versions 5.15.0.1027.26, 5.15.0.1027.32~20.04.1
linux-image-gke (Ubuntu package) - update to 5.15.0.1027.26
linux-image-5.15.0-1027-gke (Ubuntu package) - addressed in versions 5.15.0-1027.32, 5.15.0-1027.32~20.04.1
linux-image-kvm (Ubuntu package) - update to 5.15.0.1028.24
linux-image-5.15.0-1028-kvm (Ubuntu package) - update to 5.15.0-1028.33
linux-image-gcp (Ubuntu package) - addressed in versions 5.15.0.1029.24, 5.15.0.1029.36~20.04.1
linux-image-oracle (Ubuntu package) - addressed in versions 5.15.0.1029.24, 5.15.0.1029.35~20.04.1
linux-image-5.15.0-1029-oracle (Ubuntu package) - update to 5.15.0-1029.35~20.04.1
linux-image-5.15.0-1029-gcp (Ubuntu package) - addressed in versions 5.15.0-1029.36, 5.15.0-1029.36~20.04.1
linux-image-aws (Ubuntu package) - addressed in versions 5.15.0.1030.28, 5.15.0.1030.34~20.04.19
linux-image-aws-lts-22.04 (Ubuntu package) - update to 5.15.0.1030.28
linux-image-5.15.0-1030-aws (Ubuntu package) - addressed in versions 5.15.0-1030.34, 5.15.0-1030.34~20.04.1
linux-image-azure (Ubuntu package) - addressed in versions 5.15.0.1033.29, 5.15.0.1033.40~20.04.23
linux-image-azure-lts-22.04 (Ubuntu package) - update to 5.15.0.1033.29
linux-image-5.15.0-1033-azure-fde (Ubuntu package) - update to 5.15.0-1033.40.1
linux-image-azure-fde (Ubuntu package) - update to 5.15.0.1033.40.10
linux-image-5.15.0-1033-azure (Ubuntu package) - update to 5.15.0-1033.40~20.04.1

• https://github.com/torvalds/linux/commit/158a66b245739e15858de42c0ba60fcf3de9b8e6
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=158a66b245739e15858de42c0ba60fcf3de9b8e6
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.18.18
• http://www.openwall.com/lists/oss-security/2022/12/23/10
• https://www.zerodayinitiative.com/advisories/ZDI-22-1691/

• Information disclosure in Linux kernel ksmbd
• Ubuntu update for linux
• Ubuntu update for linux-gke
• Ubuntu update for linux-gke-5.15
• Ubuntu update for linux-aws
• openEuler 22.03 LTS update for kernel
• openEuler 22.03 LTS SP1 update for kernel