Bug 1529302 (CVE-2017-15537) - CVE-2017-15537 kernel: Information leak of x86 FPU registers
Summary: CVE-2017-15537 kernel: Information leak of x86 FPU registers
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2017-15537
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1529303
Blocks: 1529304
TreeView+ depends on / blocked
 
Reported: 2017-12-27 14:59 UTC by Pedro Sampaio
Modified: 2021-02-17 01:03 UTC (History)
47 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2018-03-19 15:31:34 UTC
Embargoed:

Attachments (Terms of Use)

Description Pedro Sampaio 2017-12-27 14:59:40 UTC 
The x86/fpu (Floating Point Unit) subsystem in the Linux kernel, when a processor supports the xsave feature but not the xsaves feature, does not correctly handle attempts to set reserved bits in the xstate header via the ptrace() or rt_sigreturn() system call, allowing local users to read the FPU registers of other processes on the system, related to arch/x86/kernel/fpu/regset.c and arch/x86/kernel/fpu/signal.c.

References:

https://marc.info/?t=150610240800004&r=1&w=2

https://marc.info/?l=linux-kernel&m=150617182112114

An upsteam patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=814fb7bb7db5433757d76f4c4502c96fc53b0b5e
Comment 1 Pedro Sampaio 2017-12-27 15:00:15 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1529303]
Comment 2 Justin M. Forbes 2018-01-02 14:29:28 UTC 
This was fixed for Fedora with the 4.13.5 stable update on 10/10/2017
Note You need to log in before you can comment on or make changes to this bug.