Red Hat Security Advisory: kernel security update
A security advisory from Red Hat addresses multiple vulnerabilities in the Linux kernel packages, which are central to the operating system. The issues include use-after-free bugs, denial of service, memory corruption, and improper access control in various kernel components such as geneve, mlxsw, RDMA umad, netfilter, xfs, and smb client. These vulnerabilities have been rated with a high severity impact. Red Hat has released updated kernel packages to fix these issues and recommends applying the update and rebooting affected systems.
AI Analysis
Technical Summary
This Red Hat security advisory covers seven distinct vulnerabilities in the Linux kernel used in Red Hat Enterprise Linux 8.6. The vulnerabilities include use-after-free errors in geneve_find_dev() (CVE-2025-21858) and mlxsw spectrum_mr multicast route stats (CVE-2025-68800), denial of service and memory corruption in RDMA umad (CVE-2026-23243), netfilter nf_tables flowtable release error handling (CVE-2026-23392), unsafe access to master conntrack in netfilter ctnetlink (CVE-2026-43116), freemap adjustment errors in xfs when adding extended attributes (CVE-2026-43158), and rejection of userspace cifs.spnego descriptions in smb client (CVE-2026-46243). These issues affect the kernel core components and can lead to memory corruption, denial of service, or improper kernel behavior. Red Hat has issued patches in updated kernel packages to address all these vulnerabilities.
Potential Impact
The vulnerabilities can lead to use-after-free conditions, denial of service, memory corruption, and unsafe access to kernel data structures, potentially impacting system stability and security. Exploitation could cause kernel crashes or unexpected behavior in networking and filesystem components. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Red Hat has released updated kernel packages that fix these vulnerabilities. Users should apply the security update for Red Hat Enterprise Linux 8.6 as described in the advisory RHSA-2026:26570 and reboot the system to ensure the fixes take effect. Patch status is confirmed as an official fix by Red Hat. No additional mitigation steps are indicated beyond applying the update and rebooting.
Red Hat Security Advisory: kernel security update
Description
A security advisory from Red Hat addresses multiple vulnerabilities in the Linux kernel packages, which are central to the operating system. The issues include use-after-free bugs, denial of service, memory corruption, and improper access control in various kernel components such as geneve, mlxsw, RDMA umad, netfilter, xfs, and smb client. These vulnerabilities have been rated with a high severity impact. Red Hat has released updated kernel packages to fix these issues and recommends applying the update and rebooting affected systems.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This Red Hat security advisory covers seven distinct vulnerabilities in the Linux kernel used in Red Hat Enterprise Linux 8.6. The vulnerabilities include use-after-free errors in geneve_find_dev() (CVE-2025-21858) and mlxsw spectrum_mr multicast route stats (CVE-2025-68800), denial of service and memory corruption in RDMA umad (CVE-2026-23243), netfilter nf_tables flowtable release error handling (CVE-2026-23392), unsafe access to master conntrack in netfilter ctnetlink (CVE-2026-43116), freemap adjustment errors in xfs when adding extended attributes (CVE-2026-43158), and rejection of userspace cifs.spnego descriptions in smb client (CVE-2026-46243). These issues affect the kernel core components and can lead to memory corruption, denial of service, or improper kernel behavior. Red Hat has issued patches in updated kernel packages to address all these vulnerabilities.
Potential Impact
The vulnerabilities can lead to use-after-free conditions, denial of service, memory corruption, and unsafe access to kernel data structures, potentially impacting system stability and security. Exploitation could cause kernel crashes or unexpected behavior in networking and filesystem components. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Red Hat has released updated kernel packages that fix these vulnerabilities. Users should apply the security update for Red Hat Enterprise Linux 8.6 as described in the advisory RHSA-2026:26570 and reboot the system to ensure the fixes take effect. Patch status is confirmed as an official fix by Red Hat. No additional mitigation steps are indicated beyond applying the update 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-2026:26570
- Cve Count
- 7
- Additional Cves
- ["CVE-2025-68800","CVE-2026-23243","CVE-2026-23392","CVE-2026-43116","CVE-2026-43158","CVE-2026-46243"]
- Cvss Version
- null
Threat ID: 6a32cf499f87a2db092a668f
Added to database: 6/17/2026, 4:46:01 PM
Last enriched: 6/17/2026, 5:06:07 PM
Last updated: 6/17/2026, 6:23:31 PM
Views: 2
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