Vulnerabilities
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CVE Vulnerabilities

CVE-2016-8655

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Published: Dec 08, 2016 | Modified: Apr 12, 2025
CVSS 3.x
7.8
HIGH
Source:
NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
7.2 HIGH
AV:L/AC:L/Au:N/C:C/I:C/A:C
RedHat/V2
6.6 IMPORTANT
AV:L/AC:M/Au:S/C:C/I:C/A:C
RedHat/V3
7 IMPORTANT
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Ubuntu
HIGH
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2016-8655
CWEhttps://cwe.mitre.org/data/definitions/362.html

Race condition in net/packet/af_packet.c in the Linux kernel through 4.8.12 allows local users to gain privileges or cause a denial of service (use-after-free) by leveraging the CAP_NET_RAW capability to change a socket version, related to the packet_set_ring and packet_setsockopt functions.

Weakness

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

Affected Software

NameVendorStart VersionEnd Version
Linux_kernelLinux3.2 (including)3.2.85 (excluding)
Linux_kernelLinux3.3 (including)3.10.106 (excluding)
Linux_kernelLinux3.11 (including)3.12.69 (excluding)
Linux_kernelLinux3.13 (including)3.16.40 (excluding)
Linux_kernelLinux3.17 (including)3.18.46 (excluding)
Linux_kernelLinux3.19 (including)4.1.37 (excluding)
Linux_kernelLinux4.2 (including)4.4.38 (excluding)
Linux_kernelLinux4.5 (including)4.8.14 (excluding)
Red Hat Enterprise Linux 7RedHatkernel-rt-0:3.10.0-514.10.2.rt56.435.el7*
Red Hat Enterprise Linux 7RedHatkernel-0:3.10.0-514.10.2.el7*
Red Hat Enterprise MRG 2RedHatkernel-rt-1:3.10.0-514.rt56.215.el6rt*
LinuxUbuntuesm-infra-legacy/trusty*
LinuxUbuntuesm-infra/xenial*
LinuxUbuntuprecise*
LinuxUbuntuprecise/esm*
LinuxUbuntutrusty*
LinuxUbuntutrusty/esm*
LinuxUbuntuupstream*
LinuxUbuntuvivid/ubuntu-core*
LinuxUbuntuxenial*
LinuxUbuntuyakkety*
Linux-armadaxpUbuntuprecise*
Linux-armadaxpUbuntuupstream*
Linux-awsUbuntuupstream*
Linux-floUbuntutrusty*
Linux-floUbuntuupstream*
Linux-floUbuntuvivid/stable-phone-overlay*
Linux-floUbuntuxenial*
Linux-floUbuntuyakkety*
Linux-gkeUbuntuupstream*
Linux-goldfishUbuntutrusty*
Linux-goldfishUbuntuupstream*
Linux-goldfishUbuntuxenial*
Linux-goldfishUbuntuyakkety*
Linux-goldfishUbuntuzesty*
Linux-grouperUbuntutrusty*
Linux-grouperUbuntuupstream*
Linux-hweUbuntuupstream*
Linux-hwe-edgeUbuntuupstream*
Linux-linaro-omapUbuntuprecise*
Linux-linaro-omapUbuntuupstream*
Linux-linaro-sharedUbuntuprecise*
Linux-linaro-sharedUbuntuupstream*
Linux-linaro-vexpressUbuntuprecise*
Linux-linaro-vexpressUbuntuupstream*
Linux-lts-quantalUbuntuprecise*
Linux-lts-quantalUbuntuprecise/esm*
Linux-lts-quantalUbuntuupstream*
Linux-lts-raringUbuntuprecise*
Linux-lts-raringUbuntuprecise/esm*
Linux-lts-raringUbuntuupstream*
Linux-lts-saucyUbuntuprecise*
Linux-lts-saucyUbuntuprecise/esm*
Linux-lts-saucyUbuntuupstream*
Linux-lts-trustyUbuntuprecise*
Linux-lts-trustyUbuntuprecise/esm*
Linux-lts-trustyUbuntuupstream*
Linux-lts-utopicUbuntutrusty*
Linux-lts-utopicUbuntuupstream*
Linux-lts-vividUbuntutrusty*
Linux-lts-vividUbuntuupstream*
Linux-lts-wilyUbuntutrusty*
Linux-lts-wilyUbuntuupstream*
Linux-lts-xenialUbuntuesm-infra-legacy/trusty*
Linux-lts-xenialUbuntutrusty*
Linux-lts-xenialUbuntutrusty/esm*
Linux-lts-xenialUbuntuupstream*
Linux-maguroUbuntutrusty*
Linux-maguroUbuntuupstream*
Linux-makoUbuntutrusty*
Linux-makoUbuntuupstream*
Linux-makoUbuntuvivid/stable-phone-overlay*
Linux-makoUbuntuxenial*
Linux-makoUbuntuyakkety*
Linux-mantaUbuntutrusty*
Linux-mantaUbuntuupstream*
Linux-qcm-msmUbuntuprecise*
Linux-qcm-msmUbuntuupstream*
Linux-raspi2Ubuntuupstream*
Linux-raspi2Ubuntuvivid/ubuntu-core*
Linux-raspi2Ubuntuxenial*
Linux-raspi2Ubuntuyakkety*
Linux-snapdragonUbuntuupstream*
Linux-snapdragonUbuntuxenial*
Linux-snapdragonUbuntuyakkety*
Linux-ti-omap4Ubuntuprecise*
Linux-ti-omap4Ubuntuupstream*

Extended Description

A race condition occurs within concurrent environments, and it is effectively a property of a code sequence. Depending on the context, a code sequence may be in the form of a function call, a small number of instructions, a series of program invocations, etc. A race condition violates these properties, which are closely related:

A race condition exists when an “interfering code sequence” can still access the shared resource, violating exclusivity. The interfering code sequence could be “trusted” or “untrusted.” A trusted interfering code sequence occurs within the product; it cannot be modified by the attacker, and it can only be invoked indirectly. An untrusted interfering code sequence can be authored directly by the attacker, and typically it is external to the vulnerable product.

Potential Mitigations

  • Minimize the usage of shared resources in order to remove as much complexity as possible from the control flow and to reduce the likelihood of unexpected conditions occurring.
  • Additionally, this will minimize the amount of synchronization necessary and may even help to reduce the likelihood of a denial of service where an attacker may be able to repeatedly trigger a critical section (CWE-400).

References

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