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: Linux kernel: iommufd/iova_bitmap shift-out-of-bounds vulnerability (CVE-2025-21724) * kernel: KVM: arm64: Tear down vGIC on failed vCPU creation (CVE-2025-37849) * kernel: Linux kernel: ALSA: ump buffer overflow via malformed UMP SysEx message (CVE-2025-37891) * kernel: ASoC: Intel: bytcr_rt5640: Fix invalid quirk input mapping (CVE-2025-40154) * kernel: drm/vmwgfx: Validate command header size against SVGA_CMD_MAX_DATASIZE (CVE-2025-40277) 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 distinct vulnerabilities in the Linux kernel as packaged by Red Hat for RHEL 9.4 Extended Update Support. CVE-2025-21724 involves a shift-out-of-bounds in iommufd/iova_bitmap. CVE-2025-37849 addresses teardown of the virtual Generic Interrupt Controller (vGIC) on failed virtual CPU creation in KVM for arm64. CVE-2025-37891 is a buffer overflow in ALSA ump triggered by malformed UMP SysEx messages. CVE-2025-40154 fixes an invalid quirk input mapping in the Intel bytcr_rt5640 audio codec driver. CVE-2025-40277 ensures validation of command header size against SVGA_CMD_MAX_DATASIZE in the drm/vmwgfx driver. The advisory provides updated kernel packages to remediate these issues and requires a system reboot to apply the fixes.
Potential Impact
These vulnerabilities affect the Linux kernel, which is central to system operation. Exploitation could lead to memory corruption, buffer overflows, or improper hardware virtualization behavior, potentially impacting system stability or security. The advisory rates the overall impact as Moderate. There are no known exploits in the wild at the time of publication.
Mitigation Recommendations
Red Hat has released updated kernel packages addressing these vulnerabilities for Red Hat Enterprise Linux 9.4 Extended Update Support. Users should apply the provided updates following Red Hat's instructions and reboot systems to activate the fixes. No additional mitigations are specified or required beyond applying the official update.
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: Linux kernel: iommufd/iova_bitmap shift-out-of-bounds vulnerability (CVE-2025-21724) * kernel: KVM: arm64: Tear down vGIC on failed vCPU creation (CVE-2025-37849) * kernel: Linux kernel: ALSA: ump buffer overflow via malformed UMP SysEx message (CVE-2025-37891) * kernel: ASoC: Intel: bytcr_rt5640: Fix invalid quirk input mapping (CVE-2025-40154) * kernel: drm/vmwgfx: Validate command header size against SVGA_CMD_MAX_DATASIZE (CVE-2025-40277) 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 five distinct vulnerabilities in the Linux kernel as packaged by Red Hat for RHEL 9.4 Extended Update Support. CVE-2025-21724 involves a shift-out-of-bounds in iommufd/iova_bitmap. CVE-2025-37849 addresses teardown of the virtual Generic Interrupt Controller (vGIC) on failed virtual CPU creation in KVM for arm64. CVE-2025-37891 is a buffer overflow in ALSA ump triggered by malformed UMP SysEx messages. CVE-2025-40154 fixes an invalid quirk input mapping in the Intel bytcr_rt5640 audio codec driver. CVE-2025-40277 ensures validation of command header size against SVGA_CMD_MAX_DATASIZE in the drm/vmwgfx driver. The advisory provides updated kernel packages to remediate these issues and requires a system reboot to apply the fixes.
Potential Impact
These vulnerabilities affect the Linux kernel, which is central to system operation. Exploitation could lead to memory corruption, buffer overflows, or improper hardware virtualization behavior, potentially impacting system stability or security. The advisory rates the overall impact as Moderate. There are no known exploits in the wild at the time of publication.
Mitigation Recommendations
Red Hat has released updated kernel packages addressing these vulnerabilities for Red Hat Enterprise Linux 9.4 Extended Update Support. Users should apply the provided updates following Red Hat's instructions and reboot systems to activate the fixes. No additional mitigations are specified or required beyond applying the official update.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:0917
- Cve Count
- 5
- Additional Cves
- ["CVE-2025-37849","CVE-2025-37891","CVE-2025-40154","CVE-2025-40277"]
- Cvss Version
- null
Threat ID: 6a3da1ca4853345fc1821f71
Added to database: 06/25/2026, 21:46:50 UTC
Last enriched: 06/25/2026, 22:01:48 UTC
Last updated: 07/02/2026, 21:58:21 UTC
Views: 9
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