Red Hat Security Advisory: kernel security, bug fix, and enhancement update
The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: netfilter: conntrack: clamp maximum hashtable size to INT_MAX (CVE-2025-21648) * kernel: cachestat: fix page cache statistics permission checking (CVE-2025-21691) * kernel: ALSA: aloop: Fix racy access at PCM trigger (CVE-2026-23191) * kernel: mptcp: fix slab-use-after-free in __inet_lookup_established (CVE-2026-31669) * kernel: netfilter: nf_conntrack_helper: pass helper to expect cleanup (CVE-2026-43027) * kernel: RDMA/umem: Fix double dma_buf_unpin in failure path (CVE-2026-43128) * kernel: tcp: fix potential race in tcp_v6_syn_recv_sock() (CVE-2026-43198) * kernel: dlm: validate length in dlm_search_rsb_tree (CVE-2026-43125) * kernel: netfilter: flowtable: strictly check for maximum number of actions (CVE-2026-43329) * kernel: scsi: qla2xxx: Completely fix fcport double free (CVE-2026-43414) * kernel: ipv6: rpl: reserve mac_len headroom when recompressed SRH grows (CVE-2026-43501) * kernel: ALSA: aloop: Fix peer runtime UAF during format-change stop (CVE-2026-46090) * kernel: RDMA/rxe: Fix double free in rxe_srq_from_init (CVE-2026-45852) * kernel: RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event() (CVE-2026-46181) * kernel: sctp: revalidate list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL (CVE-2026-46227) * kernel: RDMA/mlx5: Fix error path fall-through in mlx5_ib_dev_res_srq_init() (CVE-2026-46176) * kernel: exit: prevent preemption of oopsing TASK_DEAD task (CVE-2026-46173) * kernel: netfilter: nft_inner: Fix IPv6 inner_thoff desync (CVE-2026-46244) Bug Fix(es) and Enhancement(s): * iavf: during POD churn vlan filters may not be added for a vlan interface, spoofchk drops subsequent packets [rhel-9.6.z] (JIRA:RHEL-172991) * [rhel-9] WARNING: possible recursive locking detected - vmd_enable_domain+0x757/0x910 [rhel-9.6.z] (JIRA:RHEL-174469) * RHEL9.4 - s390/mm: Add missing secure storage access fixups [rhel-9.6.z] (JIRA:RHEL-183316) * drm/mgag200: 300 ms busy loop [rhel-9.6.z] (JIRA:RHEL-150177) 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 security fixes for 18 vulnerabilities in the Linux kernel used by Red Hat Enterprise Linux 9.6 EUS. Key fixes include clamping the maximum hashtable size in netfilter conntrack (CVE-2025-21648), permission checking in page cache statistics (CVE-2025-21691), race conditions and use-after-free bugs in ALSA aloop and mptcp components, double free errors in RDMA and SCSI subsystems, race conditions in TCP IPv6 socket handling, and validation improvements in netfilter flowtable and dlm components. Additionally, several bug fixes and enhancements address issues such as VLAN filter handling during POD churn and recursive locking warnings. The advisory references multiple CVEs and provides links to Red Hat's errata and update instructions.
Potential Impact
The vulnerabilities fixed in this advisory could lead to various security issues including potential denial of service, privilege escalation, use-after-free conditions, race conditions, and memory corruption within the kernel. These issues affect core kernel components that handle networking, device drivers, and memory management. Exploitation could impact system stability and security, but no known exploits in the wild are reported at this time.
Mitigation Recommendations
Red Hat has released an updated kernel package for Red Hat Enterprise Linux 9.6 Extended Update Support that addresses these vulnerabilities and bugs. Users should apply the update promptly and reboot their 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 update.
Red Hat Security Advisory: kernel security, bug fix, and enhancement update
Description
The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: netfilter: conntrack: clamp maximum hashtable size to INT_MAX (CVE-2025-21648) * kernel: cachestat: fix page cache statistics permission checking (CVE-2025-21691) * kernel: ALSA: aloop: Fix racy access at PCM trigger (CVE-2026-23191) * kernel: mptcp: fix slab-use-after-free in __inet_lookup_established (CVE-2026-31669) * kernel: netfilter: nf_conntrack_helper: pass helper to expect cleanup (CVE-2026-43027) * kernel: RDMA/umem: Fix double dma_buf_unpin in failure path (CVE-2026-43128) * kernel: tcp: fix potential race in tcp_v6_syn_recv_sock() (CVE-2026-43198) * kernel: dlm: validate length in dlm_search_rsb_tree (CVE-2026-43125) * kernel: netfilter: flowtable: strictly check for maximum number of actions (CVE-2026-43329) * kernel: scsi: qla2xxx: Completely fix fcport double free (CVE-2026-43414) * kernel: ipv6: rpl: reserve mac_len headroom when recompressed SRH grows (CVE-2026-43501) * kernel: ALSA: aloop: Fix peer runtime UAF during format-change stop (CVE-2026-46090) * kernel: RDMA/rxe: Fix double free in rxe_srq_from_init (CVE-2026-45852) * kernel: RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event() (CVE-2026-46181) * kernel: sctp: revalidate list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL (CVE-2026-46227) * kernel: RDMA/mlx5: Fix error path fall-through in mlx5_ib_dev_res_srq_init() (CVE-2026-46176) * kernel: exit: prevent preemption of oopsing TASK_DEAD task (CVE-2026-46173) * kernel: netfilter: nft_inner: Fix IPv6 inner_thoff desync (CVE-2026-46244) Bug Fix(es) and Enhancement(s): * iavf: during POD churn vlan filters may not be added for a vlan interface, spoofchk drops subsequent packets [rhel-9.6.z] (JIRA:RHEL-172991) * [rhel-9] WARNING: possible recursive locking detected - vmd_enable_domain+0x757/0x910 [rhel-9.6.z] (JIRA:RHEL-174469) * RHEL9.4 - s390/mm: Add missing secure storage access fixups [rhel-9.6.z] (JIRA:RHEL-183316) * drm/mgag200: 300 ms busy loop [rhel-9.6.z] (JIRA:RHEL-150177) 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 security fixes for 18 vulnerabilities in the Linux kernel used by Red Hat Enterprise Linux 9.6 EUS. Key fixes include clamping the maximum hashtable size in netfilter conntrack (CVE-2025-21648), permission checking in page cache statistics (CVE-2025-21691), race conditions and use-after-free bugs in ALSA aloop and mptcp components, double free errors in RDMA and SCSI subsystems, race conditions in TCP IPv6 socket handling, and validation improvements in netfilter flowtable and dlm components. Additionally, several bug fixes and enhancements address issues such as VLAN filter handling during POD churn and recursive locking warnings. The advisory references multiple CVEs and provides links to Red Hat's errata and update instructions.
Potential Impact
The vulnerabilities fixed in this advisory could lead to various security issues including potential denial of service, privilege escalation, use-after-free conditions, race conditions, and memory corruption within the kernel. These issues affect core kernel components that handle networking, device drivers, and memory management. Exploitation could impact system stability and security, but no known exploits in the wild are reported at this time.
Mitigation Recommendations
Red Hat has released an updated kernel package for Red Hat Enterprise Linux 9.6 Extended Update Support that addresses these vulnerabilities and bugs. Users should apply the update promptly and reboot their 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 update.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:34094
- Cve Count
- 18
- Additional Cves
- ["CVE-2025-21691","CVE-2026-23191","CVE-2026-31669","CVE-2026-43027","CVE-2026-43125","CVE-2026-43128","CVE-2026-43198","CVE-2026-43329","CVE-2026-43414","CVE-2026-43501","CVE-2026-45852","CVE-2026-46090","CVE-2026-46173","CVE-2026-46176","CVE-2026-46181","CVE-2026-46227","CVE-2026-46244"]
- Cvss Version
- null
Threat ID: 6a46ecb927e9c7971943caff
Added to database: 07/02/2026, 22:56:57 UTC
Last enriched: 08/06/2026, 23:55:56 UTC
Last updated: 08/17/2026, 00:41:05 UTC
Views: 319
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