Red Hat Security Advisory: kernel security update
The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: can: j1939: j1939_session_new(): fix skb reference counting (CVE-2024-56645) * kernel: ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr (CVE-2025-68183) * kernel: mm: thp: deny THP for files on anonymous inodes (CVE-2026-23375) * kernel: netfilter: nf_tables: release flowtable after rcu grace period on error (CVE-2026-23392) * kernel: netfilter: nf_conntrack_h323: check for zero length in DecodeQ931() (CVE-2026-23455) * kernel: net: sched: act_csum: validate nested VLAN headers (CVE-2026-31684) * kernel: netfilter: ip6t_eui64: reject invalid MAC header for all packets (CVE-2026-31685) * kernel: netfilter: nf_conntrack_helper: pass helper to expect cleanup (CVE-2026-43027) * kernel: io_uring/rsrc: reject zero-length fixed buffer import (CVE-2026-43006) * kernel: Bluetooth: MGMT: validate LTK enc_size on load (CVE-2026-43020) * kernel: HID: wacom: fix out-of-bounds read in wacom_intuos_bt_irq (CVE-2026-43051) * kernel: Bluetooth: SCO: fix race conditions in sco_sock_connect() (CVE-2026-43023) * kernel: netfilter: ctnetlink: ensure safe access to master conntrack (CVE-2026-43116) * kernel: wifi: brcmfmac: validate bsscfg indices in IF events (CVE-2026-43110) * kernel: netfilter: xt_tcpmss: check remaining length before reading optlen (CVE-2026-43190) * kernel: Linux kernel dpaa2-switch: Kernel memory corruption via out-of-bounds write (CVE-2026-43205) * kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks (CVE-2026-43158) * kernel: mm/page_alloc: clear page->private in free_pages_prepare() (CVE-2026-43303) 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.
AI Analysis
Technical Summary
The advisory covers a kernel security update for Red Hat Enterprise Linux 10 that fixes 18 vulnerabilities identified by CVE identifiers ranging from CVE-2024-56645 to CVE-2026-43303. These vulnerabilities affect various kernel subsystems including CAN J1939 session management, IMA xattr flag handling, transparent huge pages for anonymous inodes, netfilter flowtable management, H323 protocol decoding, VLAN header validation, MAC header validation, connection tracking helpers, io_uring buffer import, Bluetooth management and SCO socket connection, HID wacom driver, ctnetlink access, WiFi brcmfmac interface events, TCP MSS option length checking, dpaa2-switch kernel memory corruption, XFS freemap adjustments, and page allocation private data clearing. The advisory provides fixes for these issues and requires rebooting the system to apply the update.
Potential Impact
The vulnerabilities collectively pose a high security risk as they include memory corruption, out-of-bounds reads and writes, race conditions, and improper validation that could lead to system instability, privilege escalation, or denial of service. The advisory does not report any known exploits in the wild. The impact affects the core Linux kernel, which is critical to system operation and security.
Mitigation Recommendations
Red Hat has released an official security update for the Linux kernel packages in Red Hat Enterprise Linux 10 and related variants. Users should apply the update as described in the Red Hat advisory RHSA-2026:21557 and reboot their systems to ensure the fixes take effect. No additional mitigations are indicated beyond applying the official patch and rebooting.
Red Hat Security Advisory: kernel security update
Description
The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: can: j1939: j1939_session_new(): fix skb reference counting (CVE-2024-56645) * kernel: ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr (CVE-2025-68183) * kernel: mm: thp: deny THP for files on anonymous inodes (CVE-2026-23375) * kernel: netfilter: nf_tables: release flowtable after rcu grace period on error (CVE-2026-23392) * kernel: netfilter: nf_conntrack_h323: check for zero length in DecodeQ931() (CVE-2026-23455) * kernel: net: sched: act_csum: validate nested VLAN headers (CVE-2026-31684) * kernel: netfilter: ip6t_eui64: reject invalid MAC header for all packets (CVE-2026-31685) * kernel: netfilter: nf_conntrack_helper: pass helper to expect cleanup (CVE-2026-43027) * kernel: io_uring/rsrc: reject zero-length fixed buffer import (CVE-2026-43006) * kernel: Bluetooth: MGMT: validate LTK enc_size on load (CVE-2026-43020) * kernel: HID: wacom: fix out-of-bounds read in wacom_intuos_bt_irq (CVE-2026-43051) * kernel: Bluetooth: SCO: fix race conditions in sco_sock_connect() (CVE-2026-43023) * kernel: netfilter: ctnetlink: ensure safe access to master conntrack (CVE-2026-43116) * kernel: wifi: brcmfmac: validate bsscfg indices in IF events (CVE-2026-43110) * kernel: netfilter: xt_tcpmss: check remaining length before reading optlen (CVE-2026-43190) * kernel: Linux kernel dpaa2-switch: Kernel memory corruption via out-of-bounds write (CVE-2026-43205) * kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks (CVE-2026-43158) * kernel: mm/page_alloc: clear page->private in free_pages_prepare() (CVE-2026-43303) 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.
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The advisory covers a kernel security update for Red Hat Enterprise Linux 10 that fixes 18 vulnerabilities identified by CVE identifiers ranging from CVE-2024-56645 to CVE-2026-43303. These vulnerabilities affect various kernel subsystems including CAN J1939 session management, IMA xattr flag handling, transparent huge pages for anonymous inodes, netfilter flowtable management, H323 protocol decoding, VLAN header validation, MAC header validation, connection tracking helpers, io_uring buffer import, Bluetooth management and SCO socket connection, HID wacom driver, ctnetlink access, WiFi brcmfmac interface events, TCP MSS option length checking, dpaa2-switch kernel memory corruption, XFS freemap adjustments, and page allocation private data clearing. The advisory provides fixes for these issues and requires rebooting the system to apply the update.
Potential Impact
The vulnerabilities collectively pose a high security risk as they include memory corruption, out-of-bounds reads and writes, race conditions, and improper validation that could lead to system instability, privilege escalation, or denial of service. The advisory does not report any known exploits in the wild. The impact affects the core Linux kernel, which is critical to system operation and security.
Mitigation Recommendations
Red Hat has released an official security update for the Linux kernel packages in Red Hat Enterprise Linux 10 and related variants. Users should apply the update as described in the Red Hat advisory RHSA-2026:21557 and reboot their systems to ensure the fixes take effect. No additional mitigations are indicated beyond applying the official patch and rebooting.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:21557
- Cve Count
- 18
- Additional Cves
- ["CVE-2025-68183","CVE-2026-23375","CVE-2026-23392","CVE-2026-23455","CVE-2026-31684","CVE-2026-31685","CVE-2026-43006","CVE-2026-43020","CVE-2026-43023","CVE-2026-43027","CVE-2026-43051","CVE-2026-43110","CVE-2026-43116","CVE-2026-43158","CVE-2026-43190","CVE-2026-43205","CVE-2026-43303"]
Threat ID: 6a18ab6fe29bf47b502883a6
Added to database: 05/28/2026, 20:54:07 UTC
Last enriched: 08/17/2026, 21:55:33 UTC
Last updated: 09/14/2026, 00:11:09 UTC
Views: 97
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