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Bug 1563069 - (CVE-2017-18255) CVE-2017-18255 kernel: Integer overflow in events/core.c:perf_cpu_time_max_percent_handler() can allow for denial of service
CVE-2017-18255 kernel: Integer overflow in events/core.c:perf_cpu_time_max_pe...
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20170223,reported=2...
: Security
Depends On:
Blocks: 1563071
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Reported: 2018-04-03 02:28 EDT by Sam Fowler
Modified: 2018-04-11 04:52 EDT (History)
46 users (show)

See Also:
Fixed In Version: kernel 4.11
Doc Type: If docs needed, set a value
Doc Text:
A vulnerability was found in the Linux kernel's kernel/events/core.c:perf_cpu_time_max_percent_handler() function. Local privileged users could exploit this flaw to cause a denial of service due to integer overflow or possibly have unspecified other impact.
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Clone Of:
Environment:
Last Closed: 2018-04-04 13:06:39 EDT
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CRM:
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Sam Fowler 2018-04-03 02:28:21 EDT 
The Linux kernel has a vulnerability in the kernel/events/core.c:perf_cpu_time_max_percent_handler() function which local privileged users could exploit to cause a denial of service due to integer overflow or possibly have unspecified other impact.

References:

https://marc.info/?l=linux-kernel&m=148782918310003

An upstream Patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1572e45a924f254d9570093abde46430c3172e3d
Comment 3 Vladis Dronov 2018-04-04 13:03:25 EDT 
Notes:

This flaw is exploitable by the privileged user (the real "root") only and not from namespaces:

# ls -l /proc/sys/kernel/perf_cpu_time_max_percent
-rw-r--r-- 1 root root 0 Apr  4 18:52 /proc/sys/kernel/perf_cpu_time_max_percent

$ unshare -U -r
# echo 30 > /proc/sys/kernel/perf_cpu_time_max_percent
-bash: /proc/sys/kernel/perf_cpu_time_max_percent: Permission denied
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