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
This Red Hat security advisory (RHSA-2026:21557) covers a kernel security update for Red Hat Enterprise Linux 10 and related products. It addresses 18 CVEs including CVE-2024-56645 and others from 2025 and 2026, affecting various kernel subsystems such as CAN bus (j1939), IMA, transparent huge pages (THP), netfilter, Bluetooth, HID, and file systems like XFS. The fixes resolve issues like skb reference counting, flag clearing errors, denial of THP on anonymous inodes, flowtable release timing, zero-length checks, VLAN header validation, MAC header rejection, helper cleanup, buffer import validation, race conditions, memory corruption, and out-of-bounds reads. The advisory states that a kernel update is available and that a system reboot is required for the update to take effect.
Potential Impact
The vulnerabilities collectively could lead to kernel memory corruption, race conditions, denial of service, and potential privilege escalation or system instability if exploited. The issues affect core kernel functionality including networking, memory management, and device handling. The advisory rates the security impact as important (high severity). No known exploits in the wild are reported at this time.
Mitigation Recommendations
Red Hat has released an official kernel update for Red Hat Enterprise Linux 10 and related products that addresses all listed vulnerabilities. Users should apply the update as provided by Red Hat and reboot affected systems to ensure the fixes take effect. For detailed update instructions, refer to the Red Hat advisory at https://access.redhat.com/articles/11258. No additional mitigation steps 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
This Red Hat security advisory (RHSA-2026:21557) covers a kernel security update for Red Hat Enterprise Linux 10 and related products. It addresses 18 CVEs including CVE-2024-56645 and others from 2025 and 2026, affecting various kernel subsystems such as CAN bus (j1939), IMA, transparent huge pages (THP), netfilter, Bluetooth, HID, and file systems like XFS. The fixes resolve issues like skb reference counting, flag clearing errors, denial of THP on anonymous inodes, flowtable release timing, zero-length checks, VLAN header validation, MAC header rejection, helper cleanup, buffer import validation, race conditions, memory corruption, and out-of-bounds reads. The advisory states that a kernel update is available and that a system reboot is required for the update to take effect.
Potential Impact
The vulnerabilities collectively could lead to kernel memory corruption, race conditions, denial of service, and potential privilege escalation or system instability if exploited. The issues affect core kernel functionality including networking, memory management, and device handling. The advisory rates the security impact as important (high severity). No known exploits in the wild are reported at this time.
Mitigation Recommendations
Red Hat has released an official kernel update for Red Hat Enterprise Linux 10 and related products that addresses all listed vulnerabilities. Users should apply the update as provided by Red Hat and reboot affected systems to ensure the fixes take effect. For detailed update instructions, refer to the Red Hat advisory at https://access.redhat.com/articles/11258. No additional mitigation steps 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"]
- Cvss Version
- null
Threat ID: 6a18ab6fe29bf47b502883a6
Added to database: 05/28/2026, 20:54:07 UTC
Last enriched: 07/30/2026, 15:13:21 UTC
Last updated: 07/31/2026, 19:22:52 UTC
Views: 70
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