Out-of-bounds read in Linux kernel - CVE-2023-38431

Vulnerability identifier: #VU81659

CSH Severity: Medium

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

CVE-ID: CVE-2023-38431

CWE-ID: CWE-125

Exploitation vector: Adjecent network

Exploit availability: No public exploit available

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

The vulnerability exists due to a boundary condition in fs/smb/server/connection.c within ksmbd. A remote attacker can send a specially crafted data to the system, trigger an out-of-bounds read error and read contents of memory or perform a denial of service (DoS) attack.

Linux kernel
Ubuntu
linux-image-lowlatency-64k (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-generic-lpae (Ubuntu package)
linux-image-virtual (Ubuntu package)
linux-image-generic-64k (Ubuntu package)
linux-image-oem-20.04c (Ubuntu package)
linux-image-5.15.0-102-lowlatency (Ubuntu package)
linux-image-5.15.0-102-lowlatency-64k (Ubuntu package)
linux-image-5.15.0-102-generic (Ubuntu package)
linux-image-virtual-hwe-20.04 (Ubuntu package)
linux-image-5.15.0-102-generic-lpae (Ubuntu package)
linux-image-generic-64k-hwe-20.04 (Ubuntu package)
linux-image-generic-hwe-20.04 (Ubuntu package)
linux-image-generic-lpae-hwe-20.04 (Ubuntu package)
linux-image-5.15.0-102-generic-64k (Ubuntu package)
linux-image-lowlatency-64k-hwe-20.04 (Ubuntu package)
linux-image-lowlatency-hwe-20.04 (Ubuntu package)
linux-image-oem-20.04 (Ubuntu package)
linux-image-oem-20.04b (Ubuntu package)
linux-image-oem-20.04d (Ubuntu package)
linux-image-gkeop (Ubuntu package)
linux-image-gkeop-5.15 (Ubuntu package)
linux-image-5.15.0-1040-gkeop (Ubuntu package)
linux-image-nvidia (Ubuntu package)
linux-image-nvidia-lowlatency (Ubuntu package)
linux-image-5.15.0-1048-nvidia (Ubuntu package)
linux-image-5.15.0-1048-nvidia-lowlatency (Ubuntu package)
linux-image-ibm (Ubuntu package)
linux-image-raspi (Ubuntu package)
linux-image-raspi-nolpae (Ubuntu package)
linux-image-5.15.0-1050-raspi (Ubuntu package)
linux-image-5.15.0-1050-ibm (Ubuntu package)
linux-image-5.15.0-1052-intel-iotg (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-gke (Ubuntu package)
linux-image-gke-5.15 (Ubuntu package)
linux-image-5.15.0-1054-kvm (Ubuntu package)
linux-image-5.15.0-1054-gke (Ubuntu package)
linux-image-gcp-lts-22.04 (Ubuntu package)
linux-image-oracle-lts-22.04 (Ubuntu package)
linux-image-5.15.0-1055-oracle (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-5.15.0-1055-gcp (Ubuntu package)
linux-image-gcp (Ubuntu package)
linux-image-aws-lts-22.04 (Ubuntu package)
linux-image-5.15.0-1057-aws (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-azure-lts-22.04 (Ubuntu package)
linux-image-5.15.0-1060-azure-fde (Ubuntu package)
linux-image-5.15.0-1060-azure (Ubuntu package)
linux-image-azure (Ubuntu package)
linux-image-azure-cvm (Ubuntu package)
linux-image-azure-fde (Ubuntu package)
linux-image-azure-fde-lts-22.04 (Ubuntu package)
linux-image-6.2.0-34-generic-lpae (Ubuntu package)
linux-image-6.2.0-34-generic-64k (Ubuntu package)
linux-image-6.2.0-34-generic (Ubuntu package)
linux-image-generic-lpae-hwe-22.04 (Ubuntu package)
linux-image-generic-hwe-22.04 (Ubuntu package)
linux-image-generic-64k-hwe-22.04 (Ubuntu package)
linux-image-virtual-hwe-22.04 (Ubuntu package)
linux-image-6.2.0-1006-starfive (Ubuntu package)
linux-image-starfive (Ubuntu package)
linux-image-6.2.0-1011-nvidia (Ubuntu package)
linux-image-6.2.0-1011-nvidia-64k (Ubuntu package)
linux-image-nvidia-64k-hwe-22.04 (Ubuntu package)
linux-image-nvidia-hwe-22.04 (Ubuntu package)
linux-image-nvidia-64k-6.2 (Ubuntu package)
linux-image-nvidia-6.2 (Ubuntu package)
linux-image-6.2.0-1013-oracle (Ubuntu package)
linux-image-6.2.0-1013-aws (Ubuntu package)
linux-image-6.2.0-1014-kvm (Ubuntu package)
linux-image-6.2.0-1014-azure (Ubuntu package)
linux-image-6.2.0-1014-lowlatency (Ubuntu package)
linux-image-6.2.0-1014-lowlatency-64k (Ubuntu package)
linux-image-6.2.0-1014-azure-fde (Ubuntu package)
linux-image-lowlatency-64k-hwe-22.04 (Ubuntu package)
linux-image-lowlatency-hwe-22.04 (Ubuntu package)
linux-image-6.2.0-1014-raspi (Ubuntu package)
linux-image-6.2.0-1016-gcp (Ubuntu package)
linux-image-intel-iotg (Ubuntu package)
linux-image-intel (Ubuntu package)

Install updates from vendor's website.

Linux kernel - update to 6.3.8
linux-image-lowlatency-64k (Ubuntu package) - addressed in versions 5.15.0.102.98, 6.2.0.1014.14
linux-image-lowlatency (Ubuntu package) - addressed in versions 5.15.0.102.98, 6.2.0.1014.14
linux-image-generic (Ubuntu package) - addressed in versions 5.15.0.102.99, 6.2.0.34.34
linux-image-generic-lpae (Ubuntu package) - addressed in versions 5.15.0.102.99, 6.2.0.34.34
linux-image-virtual (Ubuntu package) - addressed in versions 5.15.0.102.99, 6.2.0.34.34
linux-image-generic-64k (Ubuntu package) - addressed in versions 5.15.0.102.99, 6.2.0.34.34
linux-image-oem-20.04c (Ubuntu package) - update to 5.15.0.102.112~20.04.1
linux-image-5.15.0-102-lowlatency (Ubuntu package) - update to 5.15.0-102.112~20.04.1
linux-image-5.15.0-102-lowlatency-64k (Ubuntu package) - update to 5.15.0-102.112~20.04.1
linux-image-5.15.0-102-generic (Ubuntu package) - update to 5.15.0-102.112~20.04.1
linux-image-virtual-hwe-20.04 (Ubuntu package) - update to 5.15.0.102.112~20.04.1
linux-image-5.15.0-102-generic-lpae (Ubuntu package) - update to 5.15.0-102.112~20.04.1
linux-image-generic-64k-hwe-20.04 (Ubuntu package) - update to 5.15.0.102.112~20.04.1
linux-image-generic-hwe-20.04 (Ubuntu package) - update to 5.15.0.102.112~20.04.1
linux-image-generic-lpae-hwe-20.04 (Ubuntu package) - update to 5.15.0.102.112~20.04.1
linux-image-5.15.0-102-generic-64k (Ubuntu package) - update to 5.15.0-102.112~20.04.1
linux-image-lowlatency-64k-hwe-20.04 (Ubuntu package) - update to 5.15.0.102.112~20.04.1
linux-image-lowlatency-hwe-20.04 (Ubuntu package) - update to 5.15.0.102.112~20.04.1
linux-image-oem-20.04 (Ubuntu package) - update to 5.15.0.102.112~20.04.1
linux-image-oem-20.04b (Ubuntu package) - update to 5.15.0.102.112~20.04.1
linux-image-oem-20.04d (Ubuntu package) - update to 5.15.0.102.112~20.04.1
linux-image-gkeop (Ubuntu package) - update to 5.15.0.1040.39
linux-image-gkeop-5.15 (Ubuntu package) - addressed in versions 5.15.0.1040.39, 5.15.0.1040.46~20.04.36
linux-image-5.15.0-1040-gkeop (Ubuntu package) - update to 5.15.0-1040.46~20.04.1
linux-image-nvidia (Ubuntu package) - update to 5.15.0.1048.48
linux-image-nvidia-lowlatency (Ubuntu package) - update to 5.15.0.1048.48
linux-image-5.15.0-1048-nvidia (Ubuntu package) - update to 5.15.0-1048.48
linux-image-5.15.0-1048-nvidia-lowlatency (Ubuntu package) - update to 5.15.0-1048.48
linux-image-ibm (Ubuntu package) - addressed in versions 5.15.0.1050.46, 5.15.0.1050.53~20.04.1
linux-image-raspi (Ubuntu package) - addressed in versions 5.15.0.1050.48, 6.2.0.1014.17
linux-image-raspi-nolpae (Ubuntu package) - addressed in versions 5.15.0.1050.48, 6.2.0.1014.17
linux-image-5.15.0-1050-raspi (Ubuntu package) - update to 5.15.0-1050.53
linux-image-5.15.0-1050-ibm (Ubuntu package) - update to 5.15.0-1050.53~20.04.1
linux-image-intel-iotg (Ubuntu package) - addressed in versions 5.15.0.1052.52, 5.15.0.1052.58~20.04.1
linux-image-5.15.0-1052-intel-iotg (Ubuntu package) - update to 5.15.0-1052.58~20.04.1
linux-image-intel (Ubuntu package) - update to 5.15.0.1052.58~20.04.1
linux-image-kvm (Ubuntu package) - addressed in versions 5.15.0.1054.50, 6.2.0.1014.14
linux-image-gke (Ubuntu package) - update to 5.15.0.1054.53
linux-image-gke-5.15 (Ubuntu package) - update to 5.15.0.1054.53
linux-image-5.15.0-1054-kvm (Ubuntu package) - update to 5.15.0-1054.59
linux-image-5.15.0-1054-gke (Ubuntu package) - update to 5.15.0-1054.59
linux-image-gcp-lts-22.04 (Ubuntu package) - update to 5.15.0.1055.51
linux-image-oracle-lts-22.04 (Ubuntu package) - update to 5.15.0.1055.51
linux-image-5.15.0-1055-oracle (Ubuntu package) - update to 5.15.0-1055.61~20.04.1
linux-image-oracle (Ubuntu package) - addressed in versions 5.15.0.1055.61~20.04.1, 6.2.0.1013.13
linux-image-5.15.0-1055-gcp (Ubuntu package) - update to 5.15.0-1055.63~20.04.1
linux-image-gcp (Ubuntu package) - addressed in versions 5.15.0.1055.63~20.04.1, 6.2.0.1016.16, 6.2.0.1016.18~22.04.1
linux-image-aws-lts-22.04 (Ubuntu package) - update to 5.15.0.1057.58
linux-image-5.15.0-1057-aws (Ubuntu package) - update to 5.15.0-1057.63~20.04.1
linux-image-aws (Ubuntu package) - addressed in versions 5.15.0.1057.63~20.04.1, 6.2.0.1013.13~22.04.1, 6.2.0.1013.14
linux-image-azure-lts-22.04 (Ubuntu package) - update to 5.15.0.1060.58
linux-image-5.15.0-1060-azure-fde (Ubuntu package) - addressed in versions 5.15.0-1060.69.1, 5.15.0-1060.69~20.04.1.1
linux-image-5.15.0-1060-azure (Ubuntu package) - update to 5.15.0-1060.69~20.04.1
linux-image-azure (Ubuntu package) - addressed in versions 5.15.0.1060.69~20.04.1, 6.2.0.1014.14~22.04.1
linux-image-azure-cvm (Ubuntu package) - update to 5.15.0.1060.69~20.04.1
linux-image-azure-fde (Ubuntu package) - addressed in versions 5.15.0.1060.69~20.04.1.39, 6.2.0.1014.14~22.04.1.11
linux-image-azure-fde-lts-22.04 (Ubuntu package) - update to 5.15.0.1060.69.38
linux-image-6.2.0-34-generic-lpae (Ubuntu package) - update to 6.2.0-34.34~22.04.1
linux-image-6.2.0-34-generic-64k (Ubuntu package) - update to 6.2.0-34.34~22.04.1
linux-image-6.2.0-34-generic (Ubuntu package) - update to 6.2.0-34.34~22.04.1
linux-image-generic-lpae-hwe-22.04 (Ubuntu package) - update to 6.2.0.34.34~22.04.11
linux-image-generic-hwe-22.04 (Ubuntu package) - update to 6.2.0.34.34~22.04.11
linux-image-generic-64k-hwe-22.04 (Ubuntu package) - update to 6.2.0.34.34~22.04.11
linux-image-virtual-hwe-22.04 (Ubuntu package) - update to 6.2.0.34.34~22.04.11
linux-image-6.2.0-1006-starfive (Ubuntu package) - update to 6.2.0-1006.7
linux-image-starfive (Ubuntu package) - update to 6.2.0.1006.9
linux-image-6.2.0-1011-nvidia (Ubuntu package) - update to 6.2.0-1011.11
linux-image-6.2.0-1011-nvidia-64k (Ubuntu package) - update to 6.2.0-1011.11
linux-image-nvidia-64k-hwe-22.04 (Ubuntu package) - update to 6.2.0.1011.13
linux-image-nvidia-hwe-22.04 (Ubuntu package) - update to 6.2.0.1011.13
linux-image-nvidia-64k-6.2 (Ubuntu package) - update to 6.2.0.1011.13
linux-image-nvidia-6.2 (Ubuntu package) - update to 6.2.0.1011.13
linux-image-6.2.0-1013-oracle (Ubuntu package) - update to 6.2.0-1013.13
linux-image-6.2.0-1013-aws (Ubuntu package) - update to 6.2.0-1013.13~22.04.1
linux-image-6.2.0-1014-kvm (Ubuntu package) - update to 6.2.0-1014.14
linux-image-6.2.0-1014-azure (Ubuntu package) - update to 6.2.0-1014.14~22.04.1
linux-image-6.2.0-1014-lowlatency (Ubuntu package) - update to 6.2.0-1014.14~22.04.1
linux-image-6.2.0-1014-lowlatency-64k (Ubuntu package) - update to 6.2.0-1014.14~22.04.1
linux-image-6.2.0-1014-azure-fde (Ubuntu package) - update to 6.2.0-1014.14~22.04.1.1
linux-image-lowlatency-64k-hwe-22.04 (Ubuntu package) - update to 6.2.0.1014.14~22.04.11
linux-image-lowlatency-hwe-22.04 (Ubuntu package) - update to 6.2.0.1014.14~22.04.11
linux-image-6.2.0-1014-raspi (Ubuntu package) - update to 6.2.0-1014.16
linux-image-6.2.0-1016-gcp (Ubuntu package) - update to 6.2.0-1016.18~22.04.1

• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/fs/smb/server?id=368ba06881c395f1c9a7ba22203cf8d78b4addc0
• https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.3.8
• https://security.netapp.com/advisory/ntap-20230824-0011/

• Multiple vulnerabilities in Linux kernel ksmbd
• Ubuntu update for linux
• Ubuntu update for linux-nvidia-6.2
• Ubuntu update for linux
• Ubuntu update for linux-aws