SB2026092413 - Red Hat Enterprise Linux 9 update for kernel

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2026092413

SB2026092413 - Red Hat Enterprise Linux 9 update for kernel

Published: September 24, 2026 Updated: September 30, 2026

Security Bulletin ID SB2026092413
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) Race condition (CVE-ID: CVE-2025-39964) Exploited

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

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a race condition within the include/crypto/if_alg.h. A local user can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.


2) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-53266) Exploited

CWE-ID: CWE-664 - Improper control of a resource through its lifetime

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper memory handling in the ebtables SNAT target ARP sender hardware address rewrite in net/bridge/netfilter/ebt_snat.c when processing ARP packets in bridge netfilter hooks. A local user can trigger ARP sender hardware address rewriting on a crafted nonlinear skb to cause a denial of service.

Exploitation requires the ARP sender hardware address rewrite path to be reached with a nonlinear skb fragment backed by a splice-imported file page.


Remediation

Install update from vendor's website.

References