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, including use-after-free errors (e.g., CVE-2025-21858 in geneve_find_dev), overflow prevention in asymmetric_key_generate_id, out-of-bounds reads in libceph, race conditions in md/bitmap, and validation improvements in netfilter and wifi drivers. These vulnerabilities affect core kernel components and could lead to system instability or security breaches if exploited. The update is available from Red Hat and requires rebooting the system to apply the fixes.
Potential Impact
The vulnerabilities fixed include use-after-free, overflow, out-of-bounds read, race conditions, and improper validation issues in the Linux kernel. These could potentially allow attackers to cause system crashes, escalate privileges, or execute arbitrary code depending on the specific flaw. The advisory rates the overall impact as Important (high severity). No known exploits in the wild have been reported at the time of this advisory.
Mitigation Recommendations
Red Hat has released an official security update for the Linux kernel packages in Red Hat Enterprise Linux 8.8 that addresses these vulnerabilities. Users should apply the update promptly following Red Hat's guidance at https://access.redhat.com/articles/11258 and reboot the system 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: 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, including use-after-free errors (e.g., CVE-2025-21858 in geneve_find_dev), overflow prevention in asymmetric_key_generate_id, out-of-bounds reads in libceph, race conditions in md/bitmap, and validation improvements in netfilter and wifi drivers. These vulnerabilities affect core kernel components and could lead to system instability or security breaches if exploited. The update is available from Red Hat and requires rebooting the system to apply the fixes.
Potential Impact
The vulnerabilities fixed include use-after-free, overflow, out-of-bounds read, race conditions, and improper validation issues in the Linux kernel. These could potentially allow attackers to cause system crashes, escalate privileges, or execute arbitrary code depending on the specific flaw. The advisory rates the overall impact as Important (high severity). No known exploits in the wild have been reported at the time of this advisory.
Mitigation Recommendations
Red Hat has released an official security update for the Linux kernel packages in Red Hat Enterprise Linux 8.8 that addresses these vulnerabilities. Users should apply the update promptly following Red Hat's guidance at https://access.redhat.com/articles/11258 and reboot the system 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-2026:26563
- 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"]
- Cvss Version
- null
Threat ID: 6a32cf499f87a2db092a669b
Added to database: 06/17/2026, 16:46:01 UTC
Last enriched: 07/10/2026, 11:59:46 UTC
Last updated: 08/01/2026, 16:07:34 UTC
Views: 301
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