This vulnerability (CVE-2026-43112, CVSS 8.8 High) is an out-of-bounds read in the CIFS client filesystem code within the Linux kernel, which could allow an attacker to cause a denial of service or potentially leak sensitive information. Affected versions include the mainline Linux kernel from 5.16.1 to before 6.6.136, 6.7 to before 6.12.83, 6.13 to before 6.18.24, and 6.19 to before 6.19.14. The Red Hat advisory provides patched kernel-rt packages for Red Hat Enterprise Linux 8 Real Time variants, requiring a system reboot after update.
Red Hat Product Errata RHSA-2026:36365 - Security Advisory Issued: 2026-07-07 Updated: 2026-07-07 RHSA-2026:36365 - Security Advisory Overview Updated Packages Synopsis Important: kernel-rt security update Type/Severity Security Advisory: Important Red Hat Lightspeed patch analysis Identify and remediate systems affected by this advisory. View affected systems Topic An update for kernel-rt is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. Description The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix(es): kernel: fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath (CVE-2026-43112) 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. Solution For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Affected Products Red Hat Enterprise Linux for Real Time 8 x86_64 Red Hat Enterprise Linux for Real Time for NFV 8 x86_64 Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 8.10 x86_64 Fixes BZ - 2467015 - CVE-2026-43112 kernel: fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath CVEs CVE-2026-43112 References https://access.redhat.com/security/updates/classification/#important Note: More recent versions of these packages may be available. 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