CVE-2017-1000255
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2017-1000255
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-1000255.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2017-1000255
- Related
- Published
- 2017-10-30T20:29:00Z
- Modified
- 2024-09-18T01:00:20Z
- Severity
-
- 5.5 (Medium) CVSS_V3 - CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
- Summary
- [none]
- 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 paniconoops=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 CONFIGPPCTRANSACTIONAL_MEM=n are not vulnerable.
- References
Affected packages
Debian:11 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:12 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:13 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source