{"id":"USN-4752-1","summary":"linux-oem-5.6 vulnerabilities","details":"Daniele Antonioli, Nils Ole Tippenhauer, and Kasper Rasmussen discovered\nthat legacy pairing and secure-connections pairing authentication in the\nBluetooth protocol could allow an unauthenticated user to complete\nauthentication without pairing credentials via adjacent access. A\nphysically proximate attacker could use this to impersonate a previously\npaired Bluetooth device. (CVE-2020-10135)\n\nJay Shin discovered that the ext4 file system implementation in the Linux\nkernel did not properly handle directory access with broken indexing,\nleading to an out-of-bounds read vulnerability. A local attacker could use\nthis to cause a denial of service (system crash). (CVE-2020-14314)\n\nIt was discovered that the block layer implementation in the Linux kernel\ndid not properly perform reference counting in some situations, leading to\na use-after-free vulnerability. A local attacker could use this to cause a\ndenial of service (system crash). (CVE-2020-15436)\n\nIt was discovered that the serial port driver in the Linux kernel did not\nproperly initialize a pointer in some situations. A local attacker could\npossibly use this to cause a denial of service (system crash).\n(CVE-2020-15437)\n\nAndy Nguyen discovered that the Bluetooth HCI event packet parser in the\nLinux kernel did not properly handle event advertisements of certain sizes,\nleading to a heap-based buffer overflow. A physically proximate remote\nattacker could use this to cause a denial of service (system crash) or\npossibly execute arbitrary code. (CVE-2020-24490)\n\nIt was discovered that the NFS client implementation in the Linux kernel\ndid not properly perform bounds checking before copying security labels in\nsome situations. A local attacker could use this to cause a denial of\nservice (system crash) or possibly execute arbitrary code. (CVE-2020-25212)\n\nIt was discovered that the Rados block device (rbd) driver in the Linux\nkernel did not properly perform privilege checks for access to rbd devices\nin some situations. A local attacker could use this to map or unmap rbd\nblock devices. (CVE-2020-25284)\n\nIt was discovered that the block layer subsystem in the Linux kernel did\nnot properly handle zero-length requests. A local attacker could use this\nto cause a denial of service. (CVE-2020-25641)\n\nIt was discovered that the HDLC PPP implementation in the Linux kernel did\nnot properly validate input in some situations. A local attacker could use\nthis to cause a denial of service (system crash) or possibly execute\narbitrary code. (CVE-2020-25643)\n\nKiyin (尹亮) discovered that the perf subsystem in the Linux kernel did\nnot properly deallocate memory in some situations. A privileged attacker\ncould use this to cause a denial of service (kernel memory exhaustion).\n(CVE-2020-25704)\n\nIt was discovered that the KVM hypervisor in the Linux kernel did not\nproperly handle interrupts in certain situations. A local attacker in a\nguest VM could possibly use this to cause a denial of service (host system\ncrash). (CVE-2020-27152)\n\nIt was discovered that the jfs file system implementation in the Linux\nkernel contained an out-of-bounds read vulnerability. A local attacker\ncould use this to possibly cause a denial of service (system crash).\n(CVE-2020-27815)\n\nIt was discovered that an information leak existed in the syscall\nimplementation in the Linux kernel on 32 bit systems. A local attacker\ncould use this to expose sensitive information (kernel memory).\n(CVE-2020-28588)\n\nIt was discovered that the framebuffer implementation in the Linux kernel\ndid not properly perform range checks in certain situations. A local\nattacker could use this to expose sensitive information (kernel memory).\n(CVE-2020-28915)\n\nJann Horn discovered a race condition in the copy-on-write implementation\nin the Linux kernel when handling hugepages. A local attacker could use\nthis to gain unintended write access to read-only memory pages.\n(CVE-2020-29368)\n\nJann Horn discovered that the mmap implementation in the Linux kernel\ncontained a race condition when handling munmap() operations, leading to a\nread-after-free vulnerability. A local attacker could use this to cause a\ndenial of service (system crash) or possibly expose sensitive information.\n(CVE-2020-29369)\n\nJann Horn discovered that the romfs file system in the Linux kernel did not\nproperly validate file system meta-data, leading to an out-of-bounds read.\nAn attacker could use this to construct a malicious romfs image that, when\nmounted, exposed sensitive information (kernel memory). (CVE-2020-29371)\n\nJann Horn discovered that the tty subsystem of the Linux kernel did not use\nconsistent locking in some situations, leading to a read-after-free\nvulnerability. A local attacker could use this to cause a denial of service\n(system crash) or possibly expose sensitive information (kernel memory).\n(CVE-2020-29660)\n\nJann Horn discovered a race condition in the tty subsystem of the Linux\nkernel in the locking for the TIOCSPGRP ioctl(), leading to a use-after-\nfree vulnerability. A local attacker could use this to cause a denial of\nservice (system crash) or possibly execute arbitrary code. (CVE-2020-29661)\n\nIt was discovered that a race condition existed that caused the Linux\nkernel to not properly restrict exit signal delivery. A local attacker\ncould possibly use this to send signals to arbitrary processes.\n(CVE-2020-35508)\n","modified":"2026-02-10T04:42:05Z","published":"2021-02-25T06:54:20Z","related":["UBUNTU-CVE-2020-10135","UBUNTU-CVE-2020-14314","UBUNTU-CVE-2020-15436","UBUNTU-CVE-2020-15437","UBUNTU-CVE-2020-24490","UBUNTU-CVE-2020-25212","UBUNTU-CVE-2020-25284","UBUNTU-CVE-2020-25641","UBUNTU-CVE-2020-25643","UBUNTU-CVE-2020-25704","UBUNTU-CVE-2020-27152","UBUNTU-CVE-2020-27815","UBUNTU-CVE-2020-28588","UBUNTU-CVE-2020-28915","UBUNTU-CVE-2020-29368","UBUNTU-CVE-2020-29369","UBUNTU-CVE-2020-29371","UBUNTU-CVE-2020-29660","UBUNTU-CVE-2020-29661","UBUNTU-CVE-2020-35508"],"upstream":["CVE-2020-10135","CVE-2020-14314","CVE-2020-15436","CVE-2020-15437","CVE-2020-24490","CVE-2020-25212","CVE-2020-25284","CVE-2020-25641","CVE-2020-25643","CVE-2020-25704","CVE-2020-27152","CVE-2020-27815","CVE-2020-28588","CVE-2020-28915","CVE-2020-29368","CVE-2020-29369","CVE-2020-29371","CVE-2020-29660","CVE-2020-29661","CVE-2020-35508","UBUNTU-CVE-2020-10135","UBUNTU-CVE-2020-14314","UBUNTU-CVE-2020-15436","UBUNTU-CVE-2020-15437","UBUNTU-CVE-2020-24490","UBUNTU-CVE-2020-25212","UBUNTU-CVE-2020-25284","UBUNTU-CVE-2020-25641","UBUNTU-CVE-2020-25643","UBUNTU-CVE-2020-25704","UBUNTU-CVE-2020-27152","UBUNTU-CVE-2020-27815","UBUNTU-CVE-2020-28588","UBUNTU-CVE-2020-28915","UBUNTU-CVE-2020-29368","UBUNTU-CVE-2020-29369","UBUNTU-CVE-2020-29371","UBUNTU-CVE-2020-29660","UBUNTU-CVE-2020-29661","UBUNTU-CVE-2020-35508"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4752-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-10135"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-14314"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-15436"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-15437"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-24490"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-25212"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-25284"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-25641"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-25643"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-25704"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-27152"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-27815"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-28588"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-28915"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-29368"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-29369"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-29371"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-29660"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-29661"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-35508"}],"affected":[{"package":{"name":"linux-oem-5.6","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/linux-oem-5.6@5.6.0-1048.52?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.6.0-1048.52"}]}],"versions":["5.6.0-1007.7","5.6.0-1008.8","5.6.0-1010.10","5.6.0-1011.11","5.6.0-1013.13","5.6.0-1017.17","5.6.0-1018.18","5.6.0-1020.20","5.6.0-1021.21","5.6.0-1023.23","5.6.0-1026.26","5.6.0-1027.27","5.6.0-1028.28","5.6.0-1031.32","5.6.0-1032.33","5.6.0-1033.35","5.6.0-1034.36","5.6.0-1035.37","5.6.0-1036.39","5.6.0-1039.43","5.6.0-1042.46","5.6.0-1047.51"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"5.6.0-1048.52","binary_name":"linux-buildinfo-5.6.0-1048-oem"},{"binary_version":"5.6.0-1048.52","binary_name":"linux-headers-5.6.0-1048-oem"},{"binary_version":"5.6.0-1048.52","binary_name":"linux-image-unsigned-5.6.0-1048-oem"},{"binary_version":"5.6.0-1048.52","binary_name":"linux-modules-5.6.0-1048-oem"},{"binary_version":"5.6.0-1048.52","binary_name":"linux-oem-5.6-headers-5.6.0-1048"},{"binary_version":"5.6.0-1048.52","binary_name":"linux-oem-5.6-tools-5.6.0-1048"},{"binary_version":"5.6.0-1048.52","binary_name":"linux-oem-5.6-tools-host"},{"binary_version":"5.6.0-1048.52","binary_name":"linux-tools-5.6.0-1048-oem"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:20.04:LTS","cves":[{"severity":[{"score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2020-10135"},{"severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2020-14314"},{"severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2020-15436"},{"severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}],"id":"CVE-2020-15437"},{"severity":[{"score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2020-24490"},{"severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2020-25212"},{"severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2020-25284"},{"severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2020-25641"},{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2020-25643"},{"severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2020-25704"},{"severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2020-27152"},{"severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2020-27815"},{"severity":[{"score":"CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2020-28588"},{"severity":[{"score":"CVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2020-28915"},{"severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2020-29368"},{"severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2020-29369"},{"severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2020-29371"},{"severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2020-29660"},{"severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"high","type":"Ubuntu"}],"id":"CVE-2020-29661"},{"severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}],"id":"CVE-2020-35508"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4752-1.json"}}],"schema_version":"1.7.3"}