{"id":"UBUNTU-CVE-2020-9391","details":"An issue was discovered in the Linux kernel 5.4 and 5.5 through 5.5.6 on the AArch64 architecture. It ignores the top byte in the address passed to the brk system call, potentially moving the memory break downwards when the application expects it to move upwards, aka CID-dcde237319e6. This has been observed to cause heap corruption with the GNU C Library malloc implementation.","modified":"2025-10-24T04:48:21Z","published":"2020-02-25T18:15:00Z","upstream":["CVE-2020-9391"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-9391"},{"type":"REPORT","url":"https://git.kernel.org/linus/dcde237319e626d1ec3c9d8b7613032f0fd4663a"},{"type":"REPORT","url":"http://www.openwall.com/lists/oss-security/2020/02/25/6"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=1797052"},{"type":"REPORT","url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dcde237319e626d1ec3c9d8b7613032f0fd4663a"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-9391"}],"affected":[{"package":{"name":"linux-hwe-edge","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/linux-hwe-edge@4.15.0-23.25~16.04.1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.8.0-28.30~16.04.1","4.8.0-30.32~16.04.1","4.8.0-32.34~16.04.1","4.8.0-34.36~16.04.1","4.10.0-14.16~16.04.1","4.10.0-19.21~16.04.1","4.10.0-20.22~16.04.1","4.10.0-21.23~16.04.1","4.10.0-22.24~16.04.1","4.10.0-24.28~16.04.1","4.10.0-26.30~16.04.1","4.11.0-13.19~16.04.1","4.11.0-14.20~16.04.1","4.13.0-16.19~16.04.3","4.13.0-17.20~16.04.1","4.13.0-19.22~16.04.1","4.13.0-21.24~16.04.1","4.13.0-25.29~16.04.2","4.15.0-13.14~16.04.1","4.15.0-15.16~16.04.1","4.15.0-20.21~16.04.1","4.15.0-22.24~16.04.1","4.15.0-23.25~16.04.1"],"ecosystem_specific":{"binaries":[{"binary_name":"block-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"block-modules-4.15.0-23-generic-lpae-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"crypto-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"crypto-modules-4.15.0-23-generic-lpae-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"dasd-extra-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"dasd-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"fat-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"fat-modules-4.15.0-23-generic-lpae-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"fb-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"firewire-core-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"floppy-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"fs-core-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"fs-core-modules-4.15.0-23-generic-lpae-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"fs-secondary-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"fs-secondary-modules-4.15.0-23-generic-lpae-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"input-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"input-modules-4.15.0-23-generic-lpae-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"ipmi-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"ipmi-modules-4.15.0-23-generic-lpae-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"irda-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"irda-modules-4.15.0-23-generic-lpae-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"kernel-image-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"kernel-image-4.15.0-23-generic-lpae-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-cloud-tools-4.15.0-23-generic","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-cloud-tools-4.15.0-23-lowlatency","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-headers-4.15.0-23","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-headers-4.15.0-23-generic","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-headers-4.15.0-23-generic-lpae","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-headers-4.15.0-23-lowlatency","binary_version":"4.15.0-23.25~16.04.1"},{"binary_version":"4.15.0-23.25~16.04.1","binary_name":"linux-hwe-edge-cloud-tools-4.15.0-23"},{"binary_name":"linux-hwe-edge-tools-4.15.0-23","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-hwe-edge-udebs-generic","binary_version":"4.15.0-23.25~16.04.1"},{"binary_version":"4.15.0-23.25~16.04.1","binary_name":"linux-hwe-edge-udebs-generic-lpae"},{"binary_name":"linux-image-4.15.0-23-generic","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-image-4.15.0-23-generic-lpae","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-image-4.15.0-23-lowlatency","binary_version":"4.15.0-23.25~16.04.1"},{"binary_version":"4.15.0-23.25~16.04.1","binary_name":"linux-image-unsigned-4.15.0-23-generic"},{"binary_name":"linux-image-unsigned-4.15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