RHSA-2026:65710 - Security Advisory

Topic

An update for kernel is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.

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.

Description

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

Security Fix(es):

• kernel: dm btree remove: fix use after free in rebalance_children() (CVE-2021-47600)
• kernel: netfilter: nf_tables: don't skip expired elements during walk (CVE-2023-52924)
• kernel: net: atm: fix crash due to unvalidated vcc pointer in sigd_send() (CVE-2026-31411)
• kernel: ip6_gre: Use cached t->net in ip6erspan_changelink() (CVE-2026-46120)
• kernel: crypto: ccp - copy IV using skcipher ivsize (CVE-2026-53016)
• kernel: ipv6: fix possible UAF in icmpv6_rcv() (CVE-2026-53006)
• kernel: Bluetooth: l2cap: Add missing chan lock in l2cap_ecred_reconf_rsp (CVE-2026-53071)
• kernel: USB: serial: io_ti: fix heap overflow in get_manuf_info() (CVE-2026-53196)
• kernel: i2c: stub: Reject I2C block transfers with invalid length (CVE-2026-64191)
• kernel: Kernel: Remote out-of-bounds write in RDMA/siw (CVE-2026-64268)
• kernel: can:bcm: arbitrary kernel code execution leading to escalate privileges (CVE-2026-17523)
• kernel: packet: use consistent hard_header_len in non-ring send paths ()

Bug Fix(es) and Enhancement(s):

• vhost: reset the vring metadata cache on vring reconfiguration (JIRA:RHEL-224603)

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.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture.

Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle Long Life 8.4 x86_64
• Red Hat Enterprise Linux Server - AUS 8.4 x86_64

Fixes

• BZ - 2293226 - CVE-2021-47600 kernel: dm btree remove: fix use after free in rebalance_children()
• BZ - 2343897 - CVE-2023-52924 kernel: netfilter: nf_tables: don't skip expired elements during walk
• BZ - 2456521 - CVE-2026-31411 kernel: net: atm: fix crash due to unvalidated vcc pointer in sigd_send()
• BZ - 2482614 - CVE-2026-46120 kernel: ip6_gre: Use cached t->net in ip6erspan_changelink()
• BZ - 2492269 - CVE-2026-53016 kernel: crypto: ccp - copy IV using skcipher ivsize
• BZ - 2492363 - CVE-2026-53006 kernel: ipv6: fix possible UAF in icmpv6_rcv()
• BZ - 2492458 - CVE-2026-53071 kernel: Bluetooth: l2cap: Add missing chan lock in l2cap_ecred_reconf_rsp
• BZ - 2492750 - CVE-2026-53196 kernel: USB: serial: io_ti: fix heap overflow in get_manuf_info()
• BZ - 2502872 - CVE-2026-64191 kernel: i2c: stub: Reject I2C block transfers with invalid length
• BZ - 2507089 - CVE-2026-64268 kernel: Kernel: Remote out-of-bounds write in RDMA/siw
• BZ - 2507407 - CVE-2026-17523 kernel: can:bcm: arbitrary kernel code execution leading to escalate privileges
• BZ - 2519475 - kernel: packet: use consistent hard_header_len in non-ring send paths

CVEs

• CVE-2021-47600
• CVE-2023-52924
• CVE-2026-17523
• CVE-2026-31411
• CVE-2026-46120
• CVE-2026-53006
• CVE-2026-53016
• CVE-2026-53071
• CVE-2026-53196
• CVE-2026-64191
• CVE-2026-64268
• CVE-2026-74582

References

• https://access.redhat.com/security/updates/classification/#important