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Vulnerability · Published May 31, 2023 · Assigned by mitre

CVE-2023-34256

Medium 5.5

In plain English

A medium-severity out-of-bounds read in the linux package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.2%top 84.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

An issue was discovered in the Linux kernel before 6.3.3. There is an out-of-bounds read in crc16 in lib/crc16.c when called from fs/ext4/super.c because ext4_group_desc_csum does not properly check an offset. NOTE: this is disputed by third parties because the kernel is not intended to defend against attackers with the stated "When modifying the block device while it is mounted by the filesystem" access.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.37-1DEBIAN-CVE-2023-34256
Debian:13linux6.3.7-1DEBIAN-CVE-2023-34256
Debian:14linux6.3.7-1DEBIAN-CVE-2023-34256
Ubuntu:22.04:LTSlinux5.15.0-83.92UBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-aws5.15.0-1044.49UBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-aws-6.26.2.0-1011.11~22.04.1UBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-azure5.15.0-1046.53UBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1046.53.1UBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-gcp5.15.0-1041.49UBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-gcp-6.26.2.0-1013.13~22.04.1UBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-gke5.15.0-1041.46UBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1027.32UBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-hwe-6.26.2.0-32.32~22.04.1UBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-ibm5.15.0-1037.40UBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1039.45UBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-kvm5.15.0-1041.46UBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-83.92UBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.26.2.0-1012.12~22.04.1UBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1032.32UBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-nvidia-6.26.2.0-1010.10UBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1017.17UBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1004.4UBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-oem-6.16.1.0-1014.14UBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-oracle5.15.0-1042.48UBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-raspi5.15.0-1037.40UBUNTU-CVE-2023-34256
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2023-34256
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1025.29UBUNTU-CVE-2023-34256

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

Weakness: CWE-125 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References