SB20260508122 - Signed to Unsigned Conversion Error in Linux kernel ceph

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Main Vulnerability Database SB20260508122

SB20260508122 - Signed to Unsigned Conversion Error in Linux kernel ceph

Published: May 8, 2026

Security Bulletin ID SB20260508122
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Partial DoS

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Signed to Unsigned Conversion Error (CVE-ID: CVE-2026-43405)

CWE-ID: CWE-195 - Signed to Unsigned Conversion Error

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper handling of signedness conversion in ceph_monmap_decode() when parsing an incoming monitor map message. A remote attacker can send a specially crafted message with a very large num_mon value to cause a denial of service.

The issue can trigger an attempt to allocate an excessively large chunk of memory and results in -ENOMEM being returned instead of rejecting the input as invalid.


Remediation

Install update from vendor's website.

References