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: netfilter: nf_conntrack_helper: pass helper to expect cleanup (CVE-2026-43027) * kernel: rtmutex: Use waiter::task instead of current in remove_waiter() (CVE-2026-43499) * kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected GFN (CVE-2026-46113) * kernel: futex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock (CVE-2026-53166) * kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected role (CVE-2026-53359) 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 five kernel vulnerabilities: CVE-2026-43027 fixes netfilter nf_conntrack_helper to properly pass helper to expect cleanup; CVE-2026-43499 addresses a race condition in rtmutex by using waiter::task instead of current in remove_waiter(); CVE-2026-46113 and CVE-2026-53359 resolve use-after-free bugs in KVM x86 shadow paging caused by unexpected guest frame numbers and roles; CVE-2026-53166 prevents a NULL pointer dereference in futex/requeue during self-deadlock scenarios. These fixes are included in updated kernel packages for Red Hat Enterprise Linux 9.2 and related variants.
Potential Impact
The vulnerabilities affect the Linux kernel, potentially leading to memory corruption, use-after-free conditions, NULL pointer dereferences, and race conditions. These issues could cause system instability or crashes and may be exploitable to compromise system integrity or security. Red Hat has rated the overall security impact as Important (high). No known exploits in the wild have been reported at this time.
Mitigation Recommendations
An official security update is available from Red Hat for affected kernel packages in Red Hat Enterprise Linux 9.2 and related variants. Users should apply the update as described in the Red Hat advisory (https://access.redhat.com/articles/11258) and reboot the system to activate the fixes. No additional mitigation steps are indicated by the vendor.
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: netfilter: nf_conntrack_helper: pass helper to expect cleanup (CVE-2026-43027) * kernel: rtmutex: Use waiter::task instead of current in remove_waiter() (CVE-2026-43499) * kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected GFN (CVE-2026-46113) * kernel: futex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock (CVE-2026-53166) * kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected role (CVE-2026-53359) 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
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The advisory covers five kernel vulnerabilities: CVE-2026-43027 fixes netfilter nf_conntrack_helper to properly pass helper to expect cleanup; CVE-2026-43499 addresses a race condition in rtmutex by using waiter::task instead of current in remove_waiter(); CVE-2026-46113 and CVE-2026-53359 resolve use-after-free bugs in KVM x86 shadow paging caused by unexpected guest frame numbers and roles; CVE-2026-53166 prevents a NULL pointer dereference in futex/requeue during self-deadlock scenarios. These fixes are included in updated kernel packages for Red Hat Enterprise Linux 9.2 and related variants.
Potential Impact
The vulnerabilities affect the Linux kernel, potentially leading to memory corruption, use-after-free conditions, NULL pointer dereferences, and race conditions. These issues could cause system instability or crashes and may be exploitable to compromise system integrity or security. Red Hat has rated the overall security impact as Important (high). No known exploits in the wild have been reported at this time.
Mitigation Recommendations
An official security update is available from Red Hat for affected kernel packages in Red Hat Enterprise Linux 9.2 and related variants. Users should apply the update as described in the Red Hat advisory (https://access.redhat.com/articles/11258) and reboot the system to activate the fixes. No additional mitigation steps are indicated by the vendor.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:40082
- Cve Count
- 5
- Additional Cves
- ["CVE-2026-43499","CVE-2026-46113","CVE-2026-53166","CVE-2026-53359"]
- Cvss Version
- null
Threat ID: 6a58b3f068715ace43d65bac
Added to database: 07/16/2026, 10:35:28 UTC
Last enriched: 07/16/2026, 10:41:59 UTC
Last updated: 07/17/2026, 02:47:19 UTC
Views: 4
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