{"id":"USN-5046-1","summary":"linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.11, linux-kvm, linux-oracle, linux-raspi vulnerabilities","details":"It was discovered that the bluetooth subsystem in the Linux kernel did not\nproperly perform access control. An authenticated attacker could possibly\nuse this to expose sensitive information. (CVE-2020-26558, CVE-2021-0129)\n\nMichael Brown discovered that the Xen netback driver in the Linux kernel\ndid not properly handle malformed packets from a network PV frontend,\nleading to a use-after-free vulnerability. An attacker in a guest VM could\nuse this to cause a denial of service or possibly execute arbitrary code.\n(CVE-2021-28691)\n\nIt was discovered that the bluetooth subsystem in the Linux kernel did not\nproperly handle HCI device initialization failure, leading to a double-free\nvulnerability. An attacker could use this to cause a denial of service or\npossibly execute arbitrary code. (CVE-2021-3564)\n\nIt was discovered that the bluetooth subsystem in the Linux kernel did not\nproperly handle HCI device detach events, leading to a use-after-free\nvulnerability. An attacker could use this to cause a denial of service or\npossibly execute arbitrary code. (CVE-2021-3573)\n\nIt was discovered that the NFC implementation in the Linux kernel did not\nproperly handle failed connect events leading to a NULL pointer\ndereference. A local attacker could use this to cause a denial of service.\n(CVE-2021-3587)\n","modified":"2026-04-27T16:03:36.146354894Z","published":"2021-08-18T17:29:24Z","related":["UBUNTU-CVE-2020-26558","UBUNTU-CVE-2021-0129","UBUNTU-CVE-2021-28691","UBUNTU-CVE-2021-3564","UBUNTU-CVE-2021-3573","UBUNTU-CVE-2021-3587"],"upstream":["CVE-2020-26558","CVE-2021-0129","CVE-2021-28691","CVE-2021-3564","CVE-2021-3573","CVE-2021-3587","UBUNTU-CVE-2020-26558","UBUNTU-CVE-2021-0129","UBUNTU-CVE-2021-28691","UBUNTU-CVE-2021-3564","UBUNTU-CVE-2021-3573","UBUNTU-CVE-2021-3587"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5046-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-26558"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-0129"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3564"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3573"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3587"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-28691"}],"affected":[{"package":{"name":"linux-hwe-5.11","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/linux-hwe-5.11@5.11.0-27.29~20.04.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.11.0-27.29~20.04.1"}]}],"versions":["5.11.0-22.23~20.04.1","5.11.0-25.27~20.04.1"],"ecosystem_specific":{"availability":"No 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