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: geneve: Fix use-after-free in geneve_find_dev(). (CVE-2025-21858) * kernel: nbd: defer config unlock in nbd_genl_connect (CVE-2025-68366) * kernel: crypto: asymmetric_keys - prevent overflow in asymmetric_key_generate_id (CVE-2025-68724) * kernel: mlxsw: spectrum_mr: Fix use-after-free when updating multicast route stats (CVE-2025-68800) * kernel: iommu: disable SVA when CONFIG_X86 is set (CVE-2025-71089) * kernel: libceph: make decode_pool() more resilient against corrupted osdmaps (CVE-2025-71116) * kernel: libceph: prevent potential out-of-bounds reads in handle_auth_done() (CVE-2026-22984) * kernel: libceph: replace overzealous BUG_ON in osdmap_apply_incremental() (CVE-2026-22990) * kernel: netfilter: nf_tables: release flowtable after rcu grace period on error (CVE-2026-23392) * kernel: netfilter: ip6t_eui64: reject invalid MAC header for all packets (CVE-2026-31685) * 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: md/bitmap: fix GPF in write_page caused by resize race (CVE-2026-43163) * kernel: netfilter: xt_tcpmss: check remaining length before reading optlen (CVE-2026-43190) * kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks (CVE-2026-43158) * kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions (CVE-2026-46243) * kernel: sctp: revalidate list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL (CVE-2026-46227) * kernel: wifi: mac80211: remove station if connection prep fails (CVE-2026-46125) 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 8.8 that resolves 18 vulnerabilities identified by CVE identifiers ranging from CVE-2025-21858 to CVE-2026-46243. These vulnerabilities include use-after-free errors in geneve_find_dev() and spectrum_mr multicast route stats, an overflow in asymmetric_key_generate_id, out-of-bounds reads in libceph functions, and various netfilter and wifi driver issues. The update disables SVA when CONFIG_X86 is set to mitigate a related vulnerability and fixes race conditions and invalid input handling in multiple kernel subsystems. The kernel is the core of the Linux operating system, and these fixes address critical memory safety and input validation flaws.
Potential Impact
The vulnerabilities collectively pose risks such as potential memory corruption (use-after-free, overflow), denial of service (kernel crashes due to race conditions or invalid inputs), and possible security bypasses in kernel networking and storage components. Exploitation could lead to system instability or privilege escalation, although no known exploits in the wild have been reported. The update is rated as Important by Red Hat Product Security, indicating a high security impact that warrants prompt remediation.
Mitigation Recommendations
Red Hat has released an official security update for the Linux kernel packages in Red Hat Enterprise Linux 8.8 that addresses all listed vulnerabilities. Users should apply the update as provided by Red Hat and reboot the system 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 mitigations beyond applying the official patch and rebooting are required.
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: geneve: Fix use-after-free in geneve_find_dev(). (CVE-2025-21858) * kernel: nbd: defer config unlock in nbd_genl_connect (CVE-2025-68366) * kernel: crypto: asymmetric_keys - prevent overflow in asymmetric_key_generate_id (CVE-2025-68724) * kernel: mlxsw: spectrum_mr: Fix use-after-free when updating multicast route stats (CVE-2025-68800) * kernel: iommu: disable SVA when CONFIG_X86 is set (CVE-2025-71089) * kernel: libceph: make decode_pool() more resilient against corrupted osdmaps (CVE-2025-71116) * kernel: libceph: prevent potential out-of-bounds reads in handle_auth_done() (CVE-2026-22984) * kernel: libceph: replace overzealous BUG_ON in osdmap_apply_incremental() (CVE-2026-22990) * kernel: netfilter: nf_tables: release flowtable after rcu grace period on error (CVE-2026-23392) * kernel: netfilter: ip6t_eui64: reject invalid MAC header for all packets (CVE-2026-31685) * 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: md/bitmap: fix GPF in write_page caused by resize race (CVE-2026-43163) * kernel: netfilter: xt_tcpmss: check remaining length before reading optlen (CVE-2026-43190) * kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks (CVE-2026-43158) * kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions (CVE-2026-46243) * kernel: sctp: revalidate list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL (CVE-2026-46227) * kernel: wifi: mac80211: remove station if connection prep fails (CVE-2026-46125) 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
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The advisory covers a kernel security update for Red Hat Enterprise Linux 8.8 that resolves 18 vulnerabilities identified by CVE identifiers ranging from CVE-2025-21858 to CVE-2026-46243. These vulnerabilities include use-after-free errors in geneve_find_dev() and spectrum_mr multicast route stats, an overflow in asymmetric_key_generate_id, out-of-bounds reads in libceph functions, and various netfilter and wifi driver issues. The update disables SVA when CONFIG_X86 is set to mitigate a related vulnerability and fixes race conditions and invalid input handling in multiple kernel subsystems. The kernel is the core of the Linux operating system, and these fixes address critical memory safety and input validation flaws.
Potential Impact
The vulnerabilities collectively pose risks such as potential memory corruption (use-after-free, overflow), denial of service (kernel crashes due to race conditions or invalid inputs), and possible security bypasses in kernel networking and storage components. Exploitation could lead to system instability or privilege escalation, although no known exploits in the wild have been reported. The update is rated as Important by Red Hat Product Security, indicating a high security impact that warrants prompt remediation.
Mitigation Recommendations
Red Hat has released an official security update for the Linux kernel packages in Red Hat Enterprise Linux 8.8 that addresses all listed vulnerabilities. Users should apply the update as provided by Red Hat and reboot the system 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 mitigations beyond applying the official patch and rebooting are required.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:26563
- Cve Count
- 18
- Additional Cves
- ["CVE-2025-68366","CVE-2025-68724","CVE-2025-68800","CVE-2025-71089","CVE-2025-71116","CVE-2026-22984","CVE-2026-22990","CVE-2026-23392","CVE-2026-31685","CVE-2026-43110","CVE-2026-43116","CVE-2026-43158","CVE-2026-43163","CVE-2026-43190","CVE-2026-46125","CVE-2026-46227","CVE-2026-46243"]
Threat ID: 6a32cf499f87a2db092a669b
Added to database: 06/17/2026, 16:46:01 UTC
Last enriched: 08/17/2026, 21:55:20 UTC
Last updated: 09/15/2026, 10:01:27 UTC
Views: 426
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