SB2026021135 - Ubuntu update for linux-aws-5.15

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2026021135

SB2026021135 - Ubuntu update for linux-aws-5.15

Published: February 11, 2026

Security Bulletin ID SB2026021135
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Medium 50% Low 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) Input validation error (CVE-ID: CVE-2025-40019)

CWE-ID: CWE-20 - Improper input validation

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


The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper input validation within the essiv_aead_crypt() function in crypto/essiv.c. A local user can perform a denial of service (DoS) attack.


2) Race condition (CVE-ID: CVE-2025-38561)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

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


The vulnerability allows a remote user to execute arbitrary code.

The vulnerability exists due to a race condition within the smb2_sess_setup() function in fs/smb/server/smb2pdu.c when handling the Preauth_HashValue field. A remote user can execute arbitrary code in the context of the kernel.


Remediation

Install update from vendor's website.

References