USN-4318-1

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USN-4318-1

Summary: linux, linux-hwe vulnerabilities

Details: Al Viro discovered that the vfs layer 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 expose sensitive information (kernel memory). (CVE-2020-8428) Gustavo Romero and Paul Mackerras discovered that the KVM implementation in the Linux kernel for PowerPC processors did not properly keep guest state separate from host state. A local attacker in a KVM guest could use this to cause a denial of service (host system crash). (CVE-2020-8834) Shijie Luo discovered that the ext4 file system implementation in the Linux kernel did not properly check for a too-large journal size. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service (soft lockup). (CVE-2020-8992)

References: https://ubuntu.com/security/notices/USN-4318-1, https://ubuntu.com/security/CVE-2020-8428, https://ubuntu.com/security/CVE-2020-8834, https://ubuntu.com/security/CVE-2020-8992