UBUNTU-CVE-2023-34256

Advisory lineage Upstream: 1 Downstream: 6
Upstream
CVE-2023-34256
Published: 31 May 2023, 20:15
Last modified:03 Jun 2026, 13:36

Vulnerability Summary

Overall Risk (default)
low
22/100
CVSS Score
5.5 MEDIUM
3.1 (osv_ubuntu)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

31 May 2023, 20:15
Published
Vulnerability first disclosed
03 Jun 2026, 13:36
Last Modified
Vulnerability 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

  • v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Systems

  • ubuntu•linux

    all | < 4.4.0-252.286 | < 4.15.0-223.235 | < 5.4.0-162.179 | < 5.15.0-83.92

  • ubuntu•linux-allwinner-5.19

    all

  • ubuntu•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

  • ubuntu•linux-aws-5.0

    all

  • ubuntu•linux-aws-5.11

    all

  • ubuntu•linux-aws-5.13

    all

  • ubuntu•linux-aws-5.15

    < 5.15.0-1044.49~20.04.1

  • ubuntu•linux-aws-5.19

    all

  • ubuntu•linux-aws-5.3

    all

  • ubuntu•linux-aws-5.4

    < 5.4.0-1109.118~18.04.1

  • ubuntu•linux-aws-5.8

    all

  • ubuntu•linux-aws-6.2

    < 6.2.0-1011.11~22.04.1

  • ubuntu•linux-aws-fips

    < 4.15.0-2105.111 | all | < 5.4.0-1109.118+fips1

  • ubuntu•linux-aws-hwe

    < 4.15.0-1166.179~16.04.1

  • ubuntu•linux-azure

    < 4.15.0-1175.190~14.04.1 | < 4.15.0-1175.190~16.04.1 | all | all | < 5.15.0-1046.53

  • ubuntu•linux-azure-4.15

    < 4.15.0-1175.190

  • ubuntu•linux-azure-5.11

    all

  • ubuntu•linux-azure-5.13

    all

  • ubuntu•linux-azure-5.15

    < 5.15.0-1046.53~20.04.1

  • ubuntu•linux-azure-5.19

    all

  • ubuntu•linux-azure-5.3

    all

  • ubuntu•linux-azure-5.4

    all

  • ubuntu•linux-azure-5.8

    all

  • ubuntu•linux-azure-edge

    all

  • ubuntu•linux-azure-fde

    all | < 5.15.0-1046.53.1

  • ubuntu•linux-azure-fde-5.19

    all

  • ubuntu•linux-azure-fips

    < 4.15.0-2084.90 | all | < 5.4.0-1115.122+fips1

  • ubuntu•linux-bluefield

    < 5.15.0-1023.25 | < 5.4.0-1070.76 | < 5.15.0-1023.25 | all

  • ubuntu•linux-fips

    < 4.4.0-1099.106 | all | < 4.15.0-1121.132 | < 5.4.0-1084.93

  • ubuntu•linux-gcp

    < 4.15.0-1160.177~16.04.1 | all | < 5.4.0-1112.121 | < 5.15.0-1041.49

  • ubuntu•linux-gcp-4.15

    < 4.15.0-1160.177

  • ubuntu•linux-gcp-5.11

    all

  • ubuntu•linux-gcp-5.13

    all

  • ubuntu•linux-gcp-5.15

    < 5.15.0-1041.49~20.04.1

  • ubuntu•linux-gcp-5.19

    all

  • ubuntu•linux-gcp-5.3

    all

  • ubuntu•linux-gcp-5.4

    < 5.4.0-1112.121~18.04.1

  • ubuntu•linux-gcp-5.8

    all

  • ubuntu•linux-gcp-6.2

    < 6.2.0-1013.13~22.04.1

  • ubuntu•linux-gcp-fips

    < 4.15.0-2068.73 | all | < 5.4.0-1112.121+fips1

  • ubuntu•linux-gke

    all | < 5.15.0-1041.46

  • ubuntu•linux-gke-4.15

    all

  • ubuntu•linux-gke-5.15

    all

  • ubuntu•linux-gke-5.4

    all

  • ubuntu•linux-gkeop

    < 5.4.0-1076.80 | < 5.15.0-1027.32

  • ubuntu•linux-gkeop-5.15

    < 5.15.0-1027.32~20.04.1

  • ubuntu•linux-gkeop-5.4

    all

  • ubuntu•linux-hwe

    < 4.15.0-223.235~16.04.1 | all

  • ubuntu•linux-hwe-5.11

    all

  • ubuntu•linux-hwe-5.13

    all

Showing first 50 affected entries in server-rendered view.

References (12)