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TI-2023-17090 Aliases CVE-2023-34256GHSA-rj85-7vr5-qv74

An issue was discovered in the Linux kernel before 6.3.3.

Priority LOW 24CWE-125Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-125 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00247 16th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 5

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*before 6.3.3VulnerableLinux
cpe:2.3:o:suse:linux_enterprise:12.0:sp5:*:*:*:*:*:*12.0 sp5VulnerableSUSE
cpe:2.3:o:suse:linux_enterprise:15.0:sp4:*:*:*:*:*:*15.0 sp4VulnerableSUSE
cpe:2.3:o:suse:linux_enterprise:15.0:sp5:*:*:*:*:*:*15.0 sp5VulnerableSUSE
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*10.0VulnerableDebian
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions before 6.3.3 Vulnerable ·Linux
  • cpe:2.3:o:suse:linux_enterprise:12.0:sp5:*:*:*:*:*:* Versions 12.0 sp5 Vulnerable ·SUSE
  • cpe:2.3:o:suse:linux_enterprise:15.0:sp4:*:*:*:*:*:* Versions 15.0 sp4 Vulnerable ·SUSE
  • cpe:2.3:o:suse:linux_enterprise:15.0:sp5:*:*:*:*:*:* Versions 15.0 sp5 Vulnerable ·SUSE
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-34256
  2. 2026-10-03 Alias added: GHSA-rj85-7vr5-qv74

References

Patch 4

Advisory 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences