{"id":"UBUNTU-CVE-2017-1000255","details":"On Linux running on PowerPC hardware (Power8 or later) a user process can craft a signal frame and then do a sigreturn so that the kernel will take an exception (interrupt), and use the r1 value *from the signal frame* as the kernel stack pointer. As part of the exception entry the content of the signal frame is written to the kernel stack, allowing an attacker to overwrite arbitrary locations with arbitrary values. The exception handling does produce an oops, and a panic if panic_on_oops=1, but only after kernel memory has been over written. This flaw was introduced in commit: \"5d176f751ee3 (powerpc: tm: Enable transactional memory (TM) lazily for userspace)\" which was merged upstream into v4.9-rc1. Please note that kernels built with CONFIG_PPC_TRANSACTIONAL_MEM=n are not vulnerable.","modified":"2026-02-04T04:32:12.369799Z","published":"2017-10-09T00:00:00Z","related":["USN-3443-1","USN-3443-2","USN-3487-1"],"upstream":["CVE-2017-1000255"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2017-1000255"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3443-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3443-2"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3487-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2017-1000255"}],"affected":[{"package":{"name":"linux-hwe","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/linux-hwe@4.10.0-37.41~16.04.1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.10.0-37.41~16.04.1"}]}],"versions":["4.8.0-36.36~16.04.1","4.8.0-39.42~16.04.1","4.8.0-41.44~16.04.1","4.8.0-42.45~16.04.1","4.8.0-44.47~16.04.1","4.8.0-45.48~16.04.1","4.8.0-46.49~16.04.1","4.8.0-49.52~16.04.1","4.8.0-51.54~16.04.1","4.8.0-52.55~16.04.1","4.8.0-53.56~16.04.1","4.8.0-54.57~16.04.1","4.8.0-56.61~16.04.1","4.8.0-58.63~16.04.1","4.10.0-27.30~16.04.2","4.10.0-28.32~16.04.2","4.10.0-30.34~16.04.1","4.10.0-32.36~16.04.1","4.10.0-33.37~16.04.1","4.10.0-35.39~16.04.1"],"ecosystem_specific":{"binaries":[{"binary_name":"block-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"block-modules-4.10.0-37-generic-lpae-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"crypto-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"crypto-modules-4.10.0-37-generic-lpae-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"dasd-extra-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"dasd-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"fat-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"fat-modules-4.10.0-37-generic-lpae-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"fb-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"firewire-core-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"floppy-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"fs-core-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"fs-core-modules-4.10.0-37-generic-lpae-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"fs-secondary-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"fs-secondary-modules-4.10.0-37-generic-lpae-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"input-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"input-modules-4.10.0-37-generic-lpae-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"ipmi-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"ipmi-modules-4.10.0-37-generic-lpae-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"irda-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"irda-modules-4.10.0-37-generic-lpae-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"kernel-image-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"kernel-image-4.10.0-37-generic-lpae-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"linux-cloud-tools-4.10.0-37-generic","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"linux-cloud-tools-4.10.0-37-lowlatency","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"linux-headers-4.10.0-37","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"linux-headers-4.10.0-37-generic","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"linux-headers-4.10.0-37-generic-lpae","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"linux-headers-4.10.0-37-lowlatency","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"linux-hwe-cloud-tools-4.10.0-37","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"linux-hwe-tools-4.10.0-37","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"linux-hwe-udebs-generic","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"linux-hwe-udebs-generic-lpae","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"linux-image-4.10.0-37-generic","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"linux-image-4.10.0-37-generic-lpae","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"linux-image-4.10.0-37-lowlatency","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"linux-image-extra-4.10.0-37-generic","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"linux-source-4.10.0","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"linux-tools-4.10.0-37-generic","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"linux-tools-4.10.0-37-generic-lpae","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"linux-tools-4.10.0-37-lowlatency","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"md-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"md-modules-4.10.0-37-generic-lpae-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"message-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"mouse-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"mouse-modules-4.10.0-37-generic-lpae-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"multipath-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"multipath-modules-4.10.0-37-generic-lpae-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"nfs-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"nfs-modules-4.10.0-37-generic-lpae-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"nic-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"nic-modules-4.10.0-37-generic-lpae-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"nic-pcmcia-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"nic-shared-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"nic-shared-modules-4.10.0-37-generic-lpae-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"nic-usb-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"nic-usb-modules-4.10.0-37-generic-lpae-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"parport-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"parport-modules-4.10.0-37-generic-lpae-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"pata-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"pcmcia-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"pcmcia-storage-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"plip-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"plip-modules-4.10.0-37-generic-lpae-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"ppp-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"ppp-modules-4.10.0-37-generic-lpae-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"sata-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"sata-modules-4.10.0-37-generic-lpae-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"scsi-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"scsi-modules-4.10.0-37-generic-lpae-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"serial-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"storage-core-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"storage-core-modules-4.10.0-37-generic-lpae-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"usb-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"usb-modules-4.10.0-37-generic-lpae-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"virtio-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"vlan-modules-4.10.0-37-generic-di","binary_version":"4.10.0-37.41~16.04.1"},{"binary_name":"vlan-modules-4.10.0-37-generic-lpae-di","binary_version":"4.10.0-37.41~16.04.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2017/UBUNTU-CVE-2017-1000255.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"high"}]}