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Bug 1529302 - (CVE-2017-15537) CVE-2017-15537 kernel: Information leak of x86 FPU registers
CVE-2017-15537 kernel: Information leak of x86 FPU registers
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20171017,repor...
: Security
Depends On: 1529303
Blocks: 1529304
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Reported: 2017-12-27 09:59 EST by Pedro Sampaio
Modified: 2018-03-21 10:06 EDT (History)
47 users (show)

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Doc Text:
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. This allows 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.
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Last Closed: 2018-03-19 11:31:34 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Pedro Sampaio 2017-12-27 09:59:40 EST 
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 10:00:15 EST 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1529303]
Comment 2 Justin M. Forbes 2018-01-02 09:29:28 EST 
This was fixed for Fedora with the 4.13.5 stable update on 10/10/2017
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