CVE-2023-34256: debian debian_linux Out-of-bounds Read

Modified

AliasesUBUNTU-CVE-2023-34256DEBIAN-CVE-2023-34256

Published 31-05-2023Last modified 11-03-2025

Vulnerability summary

CVE-2023-34256 is a medium (CVSS 5.5) Out-of-bounds Read vulnerability in debian debian_linux. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 16% of scored vulnerabilities.

Priority

Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?

CVSS score

5.5/10

010

Medium · v3.1 (CVE.org)

EPSS score

0.25%

0%100%

Low · 0.00 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 10 · Related 6

DLA-3508-1 DLA-3623-1 MGASA-2023-0201 MGASA-2023-0202 USN-6700-1 USN-6700-2+4 more

Timeline

31-05-2023
PublishedVulnerability first disclosed.
11-03-2025
Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

v3.15.5

EPSS trend

Probability

0.25%

Chance of exploitation in the next 30 days

Percentile

16%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.25% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs

CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

CWE-125Out-of-bounds ReadThe product reads data past the end, or before the beginning, of the intended buffer.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu103 products

linuxAll versions (No fix recorded) | < 4.4.0-252.286 | < 4.15.0-223.235 | < 5.4.0-162.179 | < 5.15.0-83.92
linux-allwinner-5.19All versions (No fix recorded)
linux-aws< 4.4.0-1129.135 | < 4.4.0-1167.182 | < 4.15.0-1166.179 | < 5.4.0-1109.118 | < 5.15.0-1044.49
linux-aws-5.0All versions (No fix recorded)
linux-aws-5.11All versions (No fix recorded)

linux-aws-5.13All versions (No fix recorded)
linux-aws-5.15< 5.15.0-1044.49~20.04.1
linux-aws-5.19All versions (No fix recorded)
linux-aws-5.3All versions (No fix recorded)
linux-aws-5.4< 5.4.0-1109.118~18.04.1
linux-aws-5.8All versions (No fix recorded)
linux-aws-6.2< 6.2.0-1011.11~22.04.1
linux-aws-fips< 4.15.0-2105.111 | All versions (No fix recorded) | < 5.4.0-1109.118+fips1
linux-aws-hwe< 4.15.0-1166.179~16.04.1
linux-azure< 4.15.0-1175.190~14.04.1 | < 4.15.0-1175.190~16.04.1 | All versions (No fix recorded) | < 5.15.0-1046.53
linux-azure-4.15< 4.15.0-1175.190
linux-azure-5.11All versions (No fix recorded)
linux-azure-5.13All versions (No fix recorded)
linux-azure-5.15< 5.15.0-1046.53~20.04.1
linux-azure-5.19All versions (No fix recorded)
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.4All versions (No fix recorded)
linux-azure-5.8All versions (No fix recorded)
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fdeAll versions (No fix recorded) | < 5.15.0-1046.53.1
linux-azure-fde-5.19All versions (No fix recorded)
linux-azure-fips< 4.15.0-2084.90 | All versions (No fix recorded) | < 5.4.0-1115.122+fips1
linux-bluefield< 5.4.0-1070.76 | < 5.15.0-1023.25
linux-fips< 4.4.0-1099.106 | All versions (No fix recorded) | < 4.15.0-1121.132 | < 5.4.0-1084.93
linux-gcp< 4.15.0-1160.177~16.04.1 | All versions (No fix recorded) | < 5.4.0-1112.121 | < 5.15.0-1041.49
linux-gcp-4.15< 4.15.0-1160.177
linux-gcp-5.11All versions (No fix recorded)
linux-gcp-5.13All versions (No fix recorded)
linux-gcp-5.15< 5.15.0-1041.49~20.04.1
linux-gcp-5.19All versions (No fix recorded)
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.4< 5.4.0-1112.121~18.04.1
linux-gcp-5.8All versions (No fix recorded)
linux-gcp-6.2< 6.2.0-1013.13~22.04.1
linux-gcp-fips< 4.15.0-2068.73 | All versions (No fix recorded) | < 5.4.0-1112.121+fips1
linux-gkeAll versions (No fix recorded) | < 5.15.0-1041.46
linux-gke-4.15All versions (No fix recorded)
linux-gke-5.15All versions (No fix recorded)
linux-gke-5.4All versions (No fix recorded)
linux-gkeop< 5.4.0-1076.80 | < 5.15.0-1027.32
linux-gkeop-5.15< 5.15.0-1027.32~20.04.1
linux-gkeop-5.4All versions (No fix recorded)
linux-hwe< 4.15.0-223.235~16.04.1 | All versions (No fix recorded)
linux-hwe-5.11All versions (No fix recorded)
linux-hwe-5.13All versions (No fix recorded)
linux-hwe-5.15< 5.15.0-83.92~20.04.1
linux-hwe-5.19All versions (No fix recorded)
linux-hwe-5.4< 5.4.0-162.179~18.04.1
linux-hwe-5.8All versions (No fix recorded)
linux-hwe-6.2< 6.2.0-32.32~22.04.1
linux-hwe-edgeAll versions (No fix recorded)
linux-ibm< 5.4.0-1056.61 | < 5.15.0-1037.40
linux-ibm-5.15< 5.15.0-1037.40~20.04.1
linux-ibm-5.4< 5.4.0-1056.61~18.04.1
linux-intel-5.13All versions (No fix recorded)
linux-intel-iot-realtime< 5.15.0-1038.40
linux-intel-iotg< 5.15.0-1039.45
linux-intel-iotg-5.15< 5.15.0-1040.46~20.04.1
linux-iot< 5.4.0-1021.22
linux-kvm< 4.4.0-1130.140 | < 4.15.0-1150.155 | < 5.4.0-1098.104 | < 5.15.0-1041.46
linux-lowlatency< 5.15.0-83.92
linux-lowlatency-hwe-5.15< 5.15.0-83.92~20.04.1
linux-lowlatency-hwe-5.19All versions (No fix recorded)
linux-lowlatency-hwe-6.2< 6.2.0-1012.12~22.04.1
linux-lts-xenial< 4.4.0-252.286~14.04.1
linux-nvidia< 5.15.0-1032.32
linux-nvidia-6.2< 6.2.0-1010.10
linux-nvidia-tegra< 5.15.0-1017.17
linux-nvidia-tegra-5.15< 5.15.0-1017.17~20.04.1
linux-nvidia-tegra-igx< 5.15.0-1004.4
linux-oemAll versions (No fix recorded)
linux-oem-5.10All versions (No fix recorded)
linux-oem-5.13All versions (No fix recorded)
linux-oem-5.14All versions (No fix recorded)
linux-oem-5.17All versions (No fix recorded)
linux-oem-5.6All versions (No fix recorded)
linux-oem-6.0All versions (No fix recorded)
linux-oem-6.1< 6.1.0-1014.14
linux-oracle< 4.15.0-1129.140~16.04.1 | < 4.15.0-1129.140 | < 5.4.0-1108.117 | < 5.15.0-1042.48
linux-oracle-5.0All versions (No fix recorded)
linux-oracle-5.11All versions (No fix recorded)
linux-oracle-5.13All versions (No fix recorded)
linux-oracle-5.15< 5.15.0-1042.48~20.04.1
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.4< 5.4.0-1108.117~18.04.1
linux-oracle-5.8All versions (No fix recorded)
linux-raspi< 5.4.0-1093.104 | < 5.15.0-1037.40
linux-raspi-5.4< 5.4.0-1093.104~18.04.1
linux-raspi-realtimeAll versions (No fix recorded)
linux-raspi2All versions (No fix recorded)
linux-realtimeAll versions (No fix recorded) | < 5.15.0-1045.50
linux-riscvAll versions (No fix recorded)
linux-riscv-5.11All versions (No fix recorded)
linux-riscv-5.15< 5.15.0-1040.44~20.04.3
linux-riscv-5.19All versions (No fix recorded)
linux-riscv-5.8All versions (No fix recorded)
linux-starfive-5.19All versions (No fix recorded)
linux-xilinx-zynqmp< 5.4.0-1029.33 | < 5.15.0-1025.29