RHSA-2026:77634: kernel security update

RHSA-2026:77634, released July 25, 2026, fixes 7 CVEs in kernel (version 6.12.0-55.109.1.el10_0). 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

0.0066

51st percentile

Priority of the 7 CVEs

Patch now 0
                                Urgent 1
                                High 6
                                Routine 0

Fixed package versions

Product	Release	Fixed in
kernel	RHEL 10	6.12.0-55.109.1.el10_0

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
Urgent	CVE-2026-43186	linux: In the Linux kernel, the following vulnerability has been resolved: ipv6: ioam: fix heap buffer overflow in __ioam6_...	9.8	0.0064	None reported
High	CVE-2026-52924	sctp: purge outqueue on stale COOKIE-ECHO handling	9.8	0.0066	None reported
High	CVE-2026-64007	kernel: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: n...	9.8	0.0051	None reported
High	CVE-2026-64383	smb: client: fix double-free in SMB2_flush() replay	9.8	0.0046	None reported
High	CVE-2026-64386	smb: client: fix query_info() replay double-free	9.8	0.0046	None reported
High	CVE-2025-40237	kernel: The kernel packages contain the Linux kernel, the core of any Linux operating system	7.1	0.0022	None reported
High	CVE-2026-45991	udf: fix partition descriptor append bookkeeping	7.8	0.0018	None reported

Also fixes CVE-2026-43186

ELSA-2026-50372
kernel-uek, kernel-uek-core, kernel-uek-debug and 32 more on ol 10, ol 9
ALAS2023-2026-1543
bpftool6.12, bpftool6.12-debuginfo, kernel-livepatch-6.12.77-99.140 and 19 more on amzn 2023
ALAS2023-2026-1544
bpftool, bpftool-debuginfo, kernel and 19 more on amzn 2023
ALAS2023-2026-1702
bpftool6.18, bpftool6.18-debuginfo, kernel-livepatch-6.18.16-18.222 and 19 more on amzn 2023
RLSA-2026:51295
kernel on rocky 10
ELSA-2026-51295
kernel, kernel-abi-stablelists, kernel-core and 27 more on ol 10
ALSA-2026:51295
kernel, kernel-64k, kernel-64k-core and 72 more on almalinux 10
DEBIAN-CVE-2026-43186
linux on Debian 12.15 (bookworm), Debian 13.5 (trixie), Debian 14

Vendor advisory

https://access.redhat.com/errata/RHSA-2026:77634

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