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: Linux kernel: Denial of service and memory corruption in RDMA umad (CVE-2026-23243) * kernel: ip6_tunnel: clear skb2->cb[] in ip4ip6_err() (CVE-2026-43037) * 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: 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) Bug Fix(es) and Enhancement(s): * RHEL-124698 missed the last line of the backport (JIRA:RHEL-168608) 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-2026:27729) covers multiple vulnerabilities in the Linux kernel packages for Red Hat Enterprise Linux 7 Extended Lifecycle Support. The primary security fix addresses a denial of service and memory corruption issue in the RDMA umad component (CVE-2026-23243). Additional fixes address vulnerabilities in ip6_tunnel (CVE-2026-43037), wifi brcmfmac (CVE-2026-43110), netfilter xt_tcpmss (CVE-2026-43190), xfs filesystem (CVE-2026-43158), and smb client (CVE-2026-46243). The advisory includes bug fixes and enhancements related to these components. The update requires a system reboot to apply the fixes. No CVSS scores are provided in the advisory, but the overall impact is rated critical by Red Hat Product Security.
Potential Impact
The vulnerabilities addressed include denial of service and memory corruption, which can affect system stability and security. The issues span multiple kernel components, potentially allowing attackers to cause crashes or memory corruption. The advisory rates the overall security impact as critical. No known exploits in the wild have been reported at the time of the advisory.
Mitigation Recommendations
Red Hat has released an updated kernel package for Red Hat Enterprise Linux 7 Extended Lifecycle Support that addresses these vulnerabilities. Users should apply the update as detailed in the Red Hat advisory (https://access.redhat.com/articles/11258) and reboot their systems to ensure the fixes take effect. This is the official and recommended remediation.
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: Linux kernel: Denial of service and memory corruption in RDMA umad (CVE-2026-23243) * kernel: ip6_tunnel: clear skb2->cb[] in ip4ip6_err() (CVE-2026-43037) * 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: 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) Bug Fix(es) and Enhancement(s): * RHEL-124698 missed the last line of the backport (JIRA:RHEL-168608) 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
This Red Hat security advisory (RHSA-2026:27729) covers multiple vulnerabilities in the Linux kernel packages for Red Hat Enterprise Linux 7 Extended Lifecycle Support. The primary security fix addresses a denial of service and memory corruption issue in the RDMA umad component (CVE-2026-23243). Additional fixes address vulnerabilities in ip6_tunnel (CVE-2026-43037), wifi brcmfmac (CVE-2026-43110), netfilter xt_tcpmss (CVE-2026-43190), xfs filesystem (CVE-2026-43158), and smb client (CVE-2026-46243). The advisory includes bug fixes and enhancements related to these components. The update requires a system reboot to apply the fixes. No CVSS scores are provided in the advisory, but the overall impact is rated critical by Red Hat Product Security.
Potential Impact
The vulnerabilities addressed include denial of service and memory corruption, which can affect system stability and security. The issues span multiple kernel components, potentially allowing attackers to cause crashes or memory corruption. The advisory rates the overall security impact as critical. No known exploits in the wild have been reported at the time of the advisory.
Mitigation Recommendations
Red Hat has released an updated kernel package for Red Hat Enterprise Linux 7 Extended Lifecycle Support that addresses these vulnerabilities. Users should apply the update as detailed in the Red Hat advisory (https://access.redhat.com/articles/11258) and reboot their systems to ensure the fixes take effect. This is the official and recommended remediation.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:27729
- Cve Count
- 6
- Additional Cves
- ["CVE-2026-43037","CVE-2026-43110","CVE-2026-43158","CVE-2026-43190","CVE-2026-46243"]
Threat ID: 6a395a05eed863c81e08e73a
Added to database: 06/22/2026, 15:51:33 UTC
Last enriched: 08/07/2026, 00:04:57 UTC
Last updated: 09/19/2026, 22:01:33 UTC
Views: 278
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