SB2026080316 - Red Hat Enterprise Linux 10 update for kernel

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Main Vulnerability Database SB2026080316

SB2026080316 - Red Hat Enterprise Linux 10 update for kernel

Published: August 3, 2026

Security Bulletin ID SB2026080316
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 3
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 33% Low 67%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 3 vulnerabilities.


1) Improper locking (CVE-ID: CVE-2025-68211)

CWE-ID: CWE-667 - Improper Locking

CVSSv4: 6.8 [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]


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

The vulnerability exists due to improper locking within the should_skip_rmap_item() and scan_get_next_rmap_item() functions in mm/ksm.c. A local user can perform a denial of service (DoS) attack.


2) Out-of-bounds read (CVE-ID: CVE-2026-46303)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 1.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in rock_continue() in the isofs Rock Ridge continuation entry parser when parsing a crafted ISO image during mount. A remote attacker can supply a crafted ISO image with a malformed CE continuation extent to disclose sensitive information.

User interaction may be required through desktop optical auto-mount, or exploitation may require mounting the crafted ISO with administrative mount capability.


3) Use-after-free (CVE-ID: CVE-2026-64530)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 6 [CVSS:4.0/AV:N/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 a use-after-free in tcf_qevent_handle in net/sched/cls_api.c when handling TC_ACT_CONSUMED during qevent processing of fragmented traffic. A local user can send specially crafted fragmented network traffic to trigger use of an skb after ownership has been transferred and cause a denial of service.

Exploitation requires RED qdisc qevents together with ct defragmentation and traffic that produces out-of-order fragments.


Remediation

Install update from vendor's website.

References