RLSA-2026:57253: kernel security update

RLSA-2026:57253, released August 21, 2026, fixes 9 CVEs in kernel (version 0:4.18.0-553.157.1.el8_10). None of them is reported as exploited. Patch Radar priority: Urgent.

Urgent

CVEs closed

1 rated Critical

Exploited

None reported

Highest CVSS

9.8

Base score, 0 to 10

Highest EPSS

0.0078

56th percentile

Priority of the 9 CVEs

Patch now 0
                                Urgent 1
                                High 8
                                Routine 0

Fixed package versions

Product	Release	Fixed in
kernel	rocky 8	0:4.18.0-553.157.1.el8_10

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
Urgent	CVE-2026-52991	sched/psi: fix race between file release and pressure write	9.8	0.0015	None reported
High	CVE-2026-63887	kernel: In the Linux kernel, the following vulnerability has been resolved: scsi: target: iscsi: Bound iscsi_encode_text_outp...	9.8	0.0078	None reported
High	CVE-2026-63888	bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: n...	9.8	0.0078	None reported
High	CVE-2026-68388	smb/client: handle overlapping allocated ranges in fallocate	9.8	0.0051	None reported
High	CVE-2026-64048	python3-perf: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: n...	7.8	0.0050	None reported
High	CVE-2026-64379	smb: client: mask server-provided mode to 07777 in modefromsid	7.8	0.0031	None reported
High	CVE-2024-56602	bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: n...	7.8	0.0023	None reported
High	CVE-2026-53189	bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: n...	8.8	0.0013	None reported
High	CVE-2026-46120	bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: n...	8.8	0.0013	None reported

Also fixes CVE-2026-52991

SUSE-SU-2026:3790-1
kernel-64kb, kernel-azure, kernel-default and 7 more on sles 15.7
SUSE-SU-2026:3810-1
kernel-livepatch-SLE15-SP7-RT_Update_19 on sles 15.7
ALAS2023-2026-1866
bpftool6.18, bpftool6.18-debuginfo, kernel-livepatch-6.18.33-63.124 and 15 more on amzn 2023
OPENSUSE-SU-2026:21910-1
dtb-aarch64, kernel-64kb, kernel-azure and 10 more on opensuse-leap 16.0
SUSE-SU-2026:23902-1
kernel-64kb, kernel-azure, kernel-default and 7 more on sles 16.0
RHSA-2026:57252
kernel, kernel-64k, kernel-64k-core and 69 more on RHEL 9
ALSA-2026:57252
kernel, kernel-64k, kernel-64k-core and 71 more on almalinux 9
RLSA-2026:57252
kernel on rocky 9

Vendor advisory

https://errata.rockylinux.org/RLSA-2026:57253

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