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: tcp_bpf: Fix the sk_mem_uncharge logic in tcp_bpf_sendmsg (CVE-2024-56633) * kernel: KVM: x86: Load DR6 with guest value only before entering .vcpu_run() loop (CVE-2025-21839) * kernel: block: fix resource leak in blk_register_queue() error path (CVE-2025-37980) * kernel: dmaengine: idxd: fix memory leak in error handling path of idxd_alloc (CVE-2025-38015) * kernel: espintcp: remove encap socket caching to avoid reference leak (CVE-2025-38097) * kernel: bpf: fix ktls panic with sockmap (CVE-2025-38166) * kernel: bpf: Check rcu_read_lock_trace_held() in bpf_map_lookup_percpu_elem() (CVE-2025-38202) * kernel: bpf: Do not include stack ptr register in precision backtracking bookkeeping (CVE-2025-38279) * kernel: ring-buffer: Do not trigger WARN_ON() due to a commit_overrun (CVE-2025-38267) * kernel: phy: qcom-qmp-usb: Fix an NULL vs IS_ERR() bug (CVE-2025-38275) * kernel: ftrace: Fix UAF when lookup kallsym after ftrace disabled (CVE-2025-38346) * kernel: ACPICA: fix acpi operand cache leak in dswstate.c (CVE-2025-38345) * kernel: nvmet: fix memory leak of bio integrity (CVE-2025-38405) * kernel: netfilter: flowtable: account for Ethernet header in nf_flow_pppoe_proto() (CVE-2025-38441) * kernel: net: vlan: fix VLAN 0 refcount imbalance of toggling filtering during runtime (CVE-2025-38470) * kernel: fs: writeback: fix use-after-free in __mark_inode_dirty() (CVE-2025-39866) * kernel: PCI/AER: Avoid NULL pointer dereference in aer_ratelimit() (CVE-2025-40034) * kernel: dm: fix NULL pointer dereference in __dm_suspend() (CVE-2025-40134) * kernel: Revert "NFSD: Remove the cap on number of operations per NFSv4 COMPOUND" (CVE-2025-40210) * kernel: Linux kernel MPTCP: Privilege escalation or denial of service via use-after-free in timer handling (CVE-2025-40257) * kernel: smb: client: fix potential cfid UAF in smb2_query_info_compound (CVE-2025-40320) * kernel: wifi: mac80211_hwsim: fix typo in frequency notification (CVE-2026-23040) * kernel: Kernel: Privilege escalation or denial of service in nf_tables via inverted element activity check (CVE-2026-23111) * kernel: Linux kernel: Denial of Service in ice driver due to race condition during VSI rebuild (CVE-2026-23210) * kernel: Linux kernel: Denial of service and memory corruption in RDMA umad (CVE-2026-23243) 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. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 10 Release Notes linked from the References section.
AI Analysis
Technical Summary
The advisory covers a comprehensive kernel security update for Red Hat Enterprise Linux 10, fixing 25 distinct CVEs affecting multiple kernel components. Key fixes include correcting sk_mem_uncharge logic in tcp_bpf_sendmsg (CVE-2024-56633), preventing privilege escalation and denial of service via use-after-free in MPTCP timer handling (CVE-2025-40257), fixing memory leaks in DMA engine and block device subsystems, addressing null pointer dereferences in PCI/AER and device mapper suspend paths, and resolving various BPF and netfilter issues. The update mitigates risks of resource leaks, kernel panics, race conditions, and potential privilege escalations. The advisory references detailed CVE pages for individual vulnerabilities and requires rebooting systems to apply the fixes.
Potential Impact
The vulnerabilities fixed by this update could lead to privilege escalation, denial of service, memory corruption, resource leaks, and kernel panics in affected Red Hat Enterprise Linux 10 systems. Exploitation could allow attackers to disrupt system stability or escalate privileges, impacting system security and availability. However, no known exploits in the wild have been reported at the time of this advisory. The overall security impact is rated moderate by Red Hat.
Mitigation Recommendations
An official security update is available from Red Hat for Red Hat Enterprise Linux 10 and related products. Users should apply the kernel update provided in advisory RHSA-2026:18134 and reboot affected systems to ensure the fixes take effect. Detailed update instructions are available at https://access.redhat.com/articles/11258. No additional mitigations are specified 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: tcp_bpf: Fix the sk_mem_uncharge logic in tcp_bpf_sendmsg (CVE-2024-56633) * kernel: KVM: x86: Load DR6 with guest value only before entering .vcpu_run() loop (CVE-2025-21839) * kernel: block: fix resource leak in blk_register_queue() error path (CVE-2025-37980) * kernel: dmaengine: idxd: fix memory leak in error handling path of idxd_alloc (CVE-2025-38015) * kernel: espintcp: remove encap socket caching to avoid reference leak (CVE-2025-38097) * kernel: bpf: fix ktls panic with sockmap (CVE-2025-38166) * kernel: bpf: Check rcu_read_lock_trace_held() in bpf_map_lookup_percpu_elem() (CVE-2025-38202) * kernel: bpf: Do not include stack ptr register in precision backtracking bookkeeping (CVE-2025-38279) * kernel: ring-buffer: Do not trigger WARN_ON() due to a commit_overrun (CVE-2025-38267) * kernel: phy: qcom-qmp-usb: Fix an NULL vs IS_ERR() bug (CVE-2025-38275) * kernel: ftrace: Fix UAF when lookup kallsym after ftrace disabled (CVE-2025-38346) * kernel: ACPICA: fix acpi operand cache leak in dswstate.c (CVE-2025-38345) * kernel: nvmet: fix memory leak of bio integrity (CVE-2025-38405) * kernel: netfilter: flowtable: account for Ethernet header in nf_flow_pppoe_proto() (CVE-2025-38441) * kernel: net: vlan: fix VLAN 0 refcount imbalance of toggling filtering during runtime (CVE-2025-38470) * kernel: fs: writeback: fix use-after-free in __mark_inode_dirty() (CVE-2025-39866) * kernel: PCI/AER: Avoid NULL pointer dereference in aer_ratelimit() (CVE-2025-40034) * kernel: dm: fix NULL pointer dereference in __dm_suspend() (CVE-2025-40134) * kernel: Revert "NFSD: Remove the cap on number of operations per NFSv4 COMPOUND" (CVE-2025-40210) * kernel: Linux kernel MPTCP: Privilege escalation or denial of service via use-after-free in timer handling (CVE-2025-40257) * kernel: smb: client: fix potential cfid UAF in smb2_query_info_compound (CVE-2025-40320) * kernel: wifi: mac80211_hwsim: fix typo in frequency notification (CVE-2026-23040) * kernel: Kernel: Privilege escalation or denial of service in nf_tables via inverted element activity check (CVE-2026-23111) * kernel: Linux kernel: Denial of Service in ice driver due to race condition during VSI rebuild (CVE-2026-23210) * kernel: Linux kernel: Denial of service and memory corruption in RDMA umad (CVE-2026-23243) 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. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 10 Release Notes linked from the References section.
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The advisory covers a comprehensive kernel security update for Red Hat Enterprise Linux 10, fixing 25 distinct CVEs affecting multiple kernel components. Key fixes include correcting sk_mem_uncharge logic in tcp_bpf_sendmsg (CVE-2024-56633), preventing privilege escalation and denial of service via use-after-free in MPTCP timer handling (CVE-2025-40257), fixing memory leaks in DMA engine and block device subsystems, addressing null pointer dereferences in PCI/AER and device mapper suspend paths, and resolving various BPF and netfilter issues. The update mitigates risks of resource leaks, kernel panics, race conditions, and potential privilege escalations. The advisory references detailed CVE pages for individual vulnerabilities and requires rebooting systems to apply the fixes.
Potential Impact
The vulnerabilities fixed by this update could lead to privilege escalation, denial of service, memory corruption, resource leaks, and kernel panics in affected Red Hat Enterprise Linux 10 systems. Exploitation could allow attackers to disrupt system stability or escalate privileges, impacting system security and availability. However, no known exploits in the wild have been reported at the time of this advisory. The overall security impact is rated moderate by Red Hat.
Mitigation Recommendations
An official security update is available from Red Hat for Red Hat Enterprise Linux 10 and related products. Users should apply the kernel update provided in advisory RHSA-2026:18134 and reboot affected systems to ensure the fixes take effect. Detailed update instructions are available at https://access.redhat.com/articles/11258. No additional mitigations are specified 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-2026:18134
- Cve Count
- 25
- Additional Cves
- ["CVE-2025-21839","CVE-2025-37980","CVE-2025-38015","CVE-2025-38097","CVE-2025-38166","CVE-2025-38202","CVE-2025-38267","CVE-2025-38275","CVE-2025-38279","CVE-2025-38345","CVE-2025-38346","CVE-2025-38405","CVE-2025-38441","CVE-2025-38470","CVE-2025-39866","CVE-2025-40034","CVE-2025-40134","CVE-2025-40210","CVE-2025-40257","CVE-2025-40320","CVE-2026-23040","CVE-2026-23111","CVE-2026-23210","CVE-2026-23243"]
- Cvss Version
- null
Threat ID: 6a160984e29bf47b506515f0
Added to database: 05/26/2026, 20:58:44 UTC
Last enriched: 07/12/2026, 10:05:44 UTC
Last updated: 07/31/2026, 19:22:52 UTC
Views: 162
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