Red Hat alert RHSA-2026:59723-01 (kernel) [LWN.net]

An update for kernel is now available for Red Hat Enterprise Linux 9.

Red Hat Product Security has rated this update as having a security impact of
Important. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating
system.

Security Fix(es):

* kernel: ksm: use range-walk function to jump over holes in
scan_get_next_rmap_item (CVE-2025-68211)

* kernel: ip6_tunnel: use skb_vlan_inet_prepare() in __ip6_tnl_rcv()
(CVE-2026-23003)

* kernel: netfilter: nft_set_pipapo_avx2: don't return non-matching entry on
expiry (CVE-2026-43114)

* kernel: sctp: purge outqueue on stale COOKIE-ECHO handling (CVE-2026-52924)

* kernel: netfilter: xt_policy: fix strict mode inbound policy matching
(CVE-2026-52920)

* kernel: zram: fix use-after-free in zram_bvec_write_partial()
(CVE-2026-53185)

* kernel: netfilter: require Ethernet MAC header before using eth_hdr()
(CVE-2026-53131)

* kernel: netfilter: conntrack_irc: fix possible out-of-bounds read
(CVE-2026-53268)

* kernel: i2c: stub: Reject I2C block transfers with invalid length
(CVE-2026-64191)

* kernel: netfilter: ipset: fix race between dump and ip_set_list resize
(CVE-2026-64189)

* kernel: Input: synaptics-rmi4 - bound the F3A keymap to the GPIO count
(CVE-2026-64277)

* kernel: Input: synaptics-rmi4 - bound the F30 keymap to the GPIO/LED count
(CVE-2026-64276)

* kernel: net: ipv6: use-after-free in fib6_rule_suppress due to stale
res->rt6 pointer (CVE-2026-74581)

Bug Fix(es) and Enhancement(s):

* [RHEL-9.8.z] Intel CWF: CPU is unable to obtain cstate1 on idle system
(JIRA:RHEL-166118)

* ss core dumped when there is an SCTP session [rhel-9.8.z]
(JIRA:RHEL-212398)

* [IBM 9.9 FEAT] zcrypt driver overwrite  function - kernel part [rhel-9.8.z]
(JIRA:RHEL-245333)

For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page(s) listed in the References section.

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Original: https://access.redhat.com/security/data/csaf/v2/advisories/2026/rhsa-2026_59723.json