CVE-2024-2496

A NULL pointer dereference flaw was found in the udevConnectListAllInterfaces() function in libvirt. This issue can occur when detaching a host interface while at the same time collecting the list of interfaces via virConnectListAllInterfaces API. This flaw could be used to perform a denial of service attack by causing the libvirt daemon to crash.

A NULL pointer dereference flaw was found in the udevConnectListAllInterfaces() function in libvirt. This issue can occur when detaching a host interface while at the same time collecting the list of interfaces via virConnectListAllInterfaces API. This flaw could be used to perform a denial of service attack by causing the libvirt daemon to crash.

Libvirt is a C toolkit to interact with the virtualization capabilities of recent versions of Linux (and other OSes). The main package includes the libvirtd server exporting the virtualization support.

Security Fix(es):

A NULL pointer dereference flaw was found in the udevConnectListAllInterfaces() function in libvirt. This issue can occur when detaching a host interface while at the same time collecting the list of interfaces via virConnectListAllInterfaces API. This flaw could be used to perform a denial of service attack by causing the libvirt daemon to crash.(CVE-2024-2496)

Libvirt is a C toolkit to interact with the virtualization capabilities of recent versions of Linux (and other OSes). The main package includes the libvirtd server exporting the virtualization support.

Security Fix(es):

A NULL pointer dereference flaw was found in the udevConnectListAllInterfaces() function in libvirt. This issue can occur when detaching a host interface while at the same time collecting the list of interfaces via virConnectListAllInterfaces API. This flaw could be used to perform a denial of service attack by causing the libvirt daemon to crash.(CVE-2024-2496)

Libvirt is a C toolkit to interact with the virtualization capabilities of recent versions of Linux (and other OSes). The main package includes the libvirtd server exporting the virtualization support.

Security Fix(es):

A NULL pointer dereference flaw was found in the udevConnectListAllInterfaces() function in libvirt. This issue can occur when detaching a host interface while at the same time collecting the list of interfaces via virConnectListAllInterfaces API. This flaw could be used to perform a denial of service attack by causing the libvirt daemon to crash.(CVE-2024-2496)

A NULL pointer dereference flaw was found in the udevConnectListAllInterfaces() function in libvirt. This issue can occur when detaching a host interface while at the same time collecting the list of interfaces via virConnectListAllInterfaces API. This flaw could be used to perform a denial of service attack by causing the libvirt daemon to crash.

The libvirt library contains a C API for managing and interacting with the virtualization capabilities of Linux and other operating systems. In addition, libvirt provides tools for remote management of virtualized systems.

Security Fix(es):

• libvirt: NULL pointer dereference in udevConnectListAllInterfaces() (CVE-2024-2496)

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.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

• CVE-2024-2496: fix memory corruption listing interfaces
• CVE-2024-4418: fix stack use-after-free in event loop

• CVE-2024-2496: Fix NULL pointer dereference in udevConnectListAllInterfaces() function

• CVE-2024-2496: Fix NULL pointer dereference in udevConnectListAllInterfaces() function

A NULL pointer dereference flaw was found in the udevConnectListAllInterfaces() function in libvirt. This issue can occur when detaching a host interface while at the same time collecting the list of interfaces via virConnectListAllInterfaces API. This flaw could be used to perform a denial of service attack by causing the libvirt daemon to crash. (CVE-2024-2496)

This update for libvirt fixes the following issues:

• CVE-2024-2496: Fixed NULL pointer dereference in udevConnectListAllInterfaces() (bsc#1221468).
• CVE-2024-1441: Fix off-by-one error in udevListInterfacesByStatus (bsc#1221237)

This update for libvirt fixes the following issues:

• CVE-2024-2494: Add a check for negative array lengths before allocation to prevent potential DoS. (bsc#1221815)
• CVE-2024-2496: Fixed NULL pointer dereference in udevConnectListAllInterfaces() (bsc#1221468).
• CVE-2024-1441: Fix off-by-one error in udevListInterfacesByStatus (bsc#1221237)
• qemu: domain: Fix logic when tainting domain (bsc#1220512)
• conf: Remove some firmware validation checks (bsc#1216980)
• libxl: Fix connection to modular network daemon (bsc#1214223)

Alexander Kuznetsov discovered that libvirt incorrectly handled certain API calls. An attacker could possibly use this issue to cause libvirt to crash, resulting in a denial of service. (CVE-2024-1441)

It was discovered that libvirt incorrectly handled certain RPC library API calls. An attacker could possibly use this issue to cause libvirt to crash, resulting in a denial of service. (CVE-2024-2494)

It was discovered that libvirt incorrectly handled detaching certain host interfaces. An attacker could possibly use this issue to cause libvirt to crash, resulting in a denial of service. (CVE-2024-2496)

It was discovered that libvirt incorrectly handled guest reboots in the libxl driver. An attacker in a guest could possibly use this issue to cause the libvirt daemon to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS. (CVE-2021-4147)

Alexander Kuznetsov discovered that libvirt incorrectly handled listing network interfaces. An attacker could possibly use this issue to cause the libvirt daemon to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 18.04 LTS. (CVE-2024-1441)

It was discovered that libvirt incorrectly handled certain values in its RPC library. An attacker could possibly use this issue to cause the libvirt daemon to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 18.04 LTS. (CVE-2024-2494)

It was discovered that libvirt incorrectly handled listing network interfaces under certain circumstances. An attacker could possibly use this issue to cause the libvirt daemon to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 18.04 LTS. (CVE-2024-2496)

It was discovered that libvirt incorrectly set permissions on external inactive snapshots, making them world-readable. A local attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2025-13193)

It was discovered that libvirt incorrectly handled certain characters in virtual network definitions. An authenticated user could possibly use this issue to inject arbitrary configuration directives and execute arbitrary code as root. This issue did not affect Ubuntu 14.04 LTS. (CVE-2026-61477)

It was discovered that libvirt incorrectly handled certain XML input. An attacker could possibly use this issue to cause the libvirt daemon to crash, resulting in a denial of service. (CVE-2026-61478)

He Wei discovered that libvirt incorrectly followed symbolic links when changing file ownership. A local attacker could possibly use this issue to escalate privileges. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-63622)

It was discovered that libvirt incorrectly set permissions on images during storage volume clone and convert operations, making them temporarily world-readable. A local attacker could possibly use this issue to obtain sensitive information. (CVE-2026-63623)