RHSA-2026:73645 - Security Advisory

Topic

An update for kernel is now available for Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions.

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: linux/dim: Fix divide by 0 in RDMA DIM (CVE-2022-49670)
• kernel: ALSA: 6fire: fix use-after-free on disconnect (CVE-2026-31581)
• kernel: sctp: purge outqueue on stale COOKIE-ECHO handling (CVE-2026-52924)
• kernel: net: pull headers in qdisc_pkt_len_segs_init() (CVE-2026-53091)
• kernel: dm log: fix out-of-bounds write due to region_count overflow (CVE-2026-53059)
• kernel: netfilter: conntrack: remove sprintf usage (CVE-2026-53002)
• kernel: tipc: fix double-free in tipc_buf_append() (CVE-2026-52993)
• kernel: Bluetooth: l2cap: Add missing chan lock in l2cap_ecred_reconf_rsp (CVE-2026-53071)
• kernel: zram: fix use-after-free in zram_bvec_write_partial() (CVE-2026-53185)
• kernel: i2c: stub: Reject I2C block transfers with invalid length (CVE-2026-64191)
• kernel: AMD-SN-7061: Safe RET Interrupt Vulnerability (CVE-2026-68480)
• kernel: net: qrtr: restrict socket creation to the initial network namespace (CVE-2026-68294)
• kernel: dm-verity: fix buffer overflow in FEC calculation (CVE-2026-72098)
• kernel: netfilter: flowtable: publish GC-visible tuple last (CVE-2026-74746)

Bug Fix(es) and Enhancement(s):

• Backport 9aca491e0dcc ("Set fc_nlinfo in nh_create_ipv4, nh_create_ipv6") [rhel-9.4.z] (JIRA:RHEL-155585)
• GNR-D: kdump and manual kexec result in hard system freeze with no console output [rhel-9.4.z] (JIRA:RHEL-168729)
• RHEL9.4 - dasd: Fix PPRC copy pair swap state and format information. [rhel-9.4.z] (JIRA:RHEL-176467)
• RT scheduler livelock: migrate-disabled task at pushable-list head causes repeated RT push/stopper retries, starving a critical RT task (remaining issue after CVE-2026-45919 fix in 94894c9c477e) [rhel-9.4.z] (JIRA:RHEL-257979)

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 Server - AUS 9.4 x86_64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.4 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.4 x86_64
• Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.4 aarch64
• Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.4 s390x
• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.4 x86_64
• Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 9.4 aarch64
• Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.4 ppc64le
• Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 9.4 s390x

Fixes

• BZ - 2347919 - CVE-2022-49670 kernel: linux/dim: Fix divide by 0 in RDMA DIM
• BZ - 2461471 - CVE-2026-31581 kernel: ALSA: 6fire: fix use-after-free on disconnect
• BZ - 2492095 - CVE-2026-52924 kernel: sctp: purge outqueue on stale COOKIE-ECHO handling
• BZ - 2492270 - CVE-2026-53091 kernel: net: pull headers in qdisc_pkt_len_segs_init()
• BZ - 2492277 - CVE-2026-53059 kernel: dm log: fix out-of-bounds write due to region_count overflow
• BZ - 2492329 - CVE-2026-53002 kernel: netfilter: conntrack: remove sprintf usage
• BZ - 2492437 - CVE-2026-52993 kernel: tipc: fix double-free in tipc_buf_append()
• BZ - 2492458 - CVE-2026-53071 kernel: Bluetooth: l2cap: Add missing chan lock in l2cap_ecred_reconf_rsp
• BZ - 2492735 - CVE-2026-53185 kernel: zram: fix use-after-free in zram_bvec_write_partial()
• BZ - 2502872 - CVE-2026-64191 kernel: i2c: stub: Reject I2C block transfers with invalid length
• BZ - 2508363 - CVE-2026-68480 kernel: AMD-SN-7061: Safe RET Interrupt Vulnerability
• BZ - 2513353 - CVE-2026-68294 kernel: net: qrtr: restrict socket creation to the initial network namespace
• BZ - 2516501 - CVE-2026-72098 kernel: dm-verity: fix buffer overflow in FEC calculation
• BZ - 2524483 - CVE-2026-74746 kernel: netfilter: flowtable: publish GC-visible tuple last

CVEs

• CVE-2022-49670
• CVE-2026-31581
• CVE-2026-52924
• CVE-2026-52993
• CVE-2026-53002
• CVE-2026-53059
• CVE-2026-53071
• CVE-2026-53091
• CVE-2026-53185
• CVE-2026-64191
• CVE-2026-68294
• CVE-2026-68480
• CVE-2026-72098
• CVE-2026-74746

References

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