LSN-0086-1

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LSN-0086-1

Summary: Kernel Live Patch Security Notice

Details: It was discovered that a race condition existed in the network scheduling subsystem of the Linux kernel, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.(CVE-2021-39713) Yiqi Sun and Kevin Wang discovered that the cgroups implementation in the Linux kernel did not properly restrict access to the cgroups v1 release_agent feature. A local attacker could use this to gain administrative privileges.(CVE-2022-0492) It was discovered that the network traffic control implementation in the Linux kernel contained a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.(CVE-2022-1055) Bing-Jhong Billy Jheng discovered that the io_uring subsystem in the Linux kernel contained in integer overflow. A local attacker could use this to cause a denial of service (system crash) or execute arbitrary code.(CVE-2022-1116) It was discovered that the Linux kernel did not properly restrict access to the kernel debugger when booted in secure boot environments. A privileged attacker could use this to bypass UEFI Secure Boot restrictions.(CVE-2022-21499) Kyle Zeng discovered that the Network Queuing and Scheduling subsystem of the Linux kernel did not properly perform reference counting in some situations, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or execute arbitrary code.(CVE-2022-29581) Jann Horn discovered that the Linux kernel did not properly enforce seccomp restrictions in some situations. A local attacker could use this to bypass intended seccomp sandbox restrictions.(CVE-2022-30594)

References: https://ubuntu.com/security/notices/LSN-0086-1, https://ubuntu.com/security/CVE-2021-39713, https://ubuntu.com/security/CVE-2022-0492, https://ubuntu.com/security/CVE-2022-1055, https://ubuntu.com/security/CVE-2022-1116, https://ubuntu.com/security/CVE-2022-21499, https://ubuntu.com/security/CVE-2022-29581, https://ubuntu.com/security/CVE-2022-30594