Vulnerabilities
Misconfiguration
Compliance
CVE Vulnerabilities

CVE-2016-9576

Use After Free

Published: Dec 28, 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
6.2 MODERATE
AV:L/AC:H/Au:N/C:C/I:C/A:C
RedHat/V3
7 MODERATE
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Ubuntu
LOW
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2016-9576
CWEhttps://cwe.mitre.org/data/definitions/416.html

The blk_rq_map_user_iov function in block/blk-map.c in the Linux kernel before 4.8.14 does not properly restrict the type of iterator, which allows local users to read or write to arbitrary kernel memory locations or cause a denial of service (use-after-free) by leveraging access to a /dev/sg device.

Weakness

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.

Affected Software

NameVendorStart VersionEnd Version
Linux_kernelLinux4.0 (including)4.4.38 (excluding)
Linux_kernelLinux4.5 (including)4.8.14 (excluding)
Red Hat Enterprise Linux 6RedHatkernel-0:2.6.32-696.el6*
Red Hat Enterprise Linux 7RedHatkernel-rt-0:3.10.0-693.rt56.617.el7*
Red Hat Enterprise Linux 7RedHatkernel-0:3.10.0-693.el7*
Red Hat Enterprise MRG 2RedHatkernel-rt-1:3.10.0-693.2.1.rt56.585.el6rt*
LinuxUbuntuesm-infra/xenial*
LinuxUbuntuprecise*
LinuxUbuntuprecise/esm*
LinuxUbuntuupstream*
LinuxUbuntuvivid/ubuntu-core*
LinuxUbuntuxenial*
LinuxUbuntuyakkety*
Linux-armadaxpUbuntuprecise*
Linux-armadaxpUbuntuupstream*
Linux-awsUbuntuesm-infra/xenial*
Linux-awsUbuntuupstream*
Linux-awsUbuntuxenial*
Linux-azureUbuntuupstream*
Linux-azure-edgeUbuntuupstream*
Linux-euclidUbuntuupstream*
Linux-euclidUbuntuxenial*
Linux-floUbuntutrusty*
Linux-floUbuntuupstream*
Linux-floUbuntuxenial*
Linux-gcpUbuntuupstream*
Linux-gkeUbuntuupstream*
Linux-goldfishUbuntutrusty*
Linux-goldfishUbuntuupstream*
Linux-goldfishUbuntuxenial*
Linux-goldfishUbuntuyakkety*
Linux-goldfishUbuntuzesty*
Linux-grouperUbuntutrusty*
Linux-grouperUbuntuupstream*
Linux-hweUbuntuesm-infra/xenial*
Linux-hweUbuntuupstream*
Linux-hweUbuntuxenial*
Linux-hwe-edgeUbuntuesm-infra/xenial*
Linux-hwe-edgeUbuntuupstream*
Linux-hwe-edgeUbuntuxenial*
Linux-kvmUbuntuupstream*
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-vividUbuntutrusty/esm*
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-makoUbuntuxenial*
Linux-mantaUbuntutrusty*
Linux-mantaUbuntuupstream*
Linux-oemUbuntuupstream*
Linux-qcm-msmUbuntuprecise*
Linux-qcm-msmUbuntuupstream*
Linux-raspi2Ubuntuupstream*
Linux-raspi2Ubuntuxenial*
Linux-raspi2Ubuntuyakkety*
Linux-snapdragonUbuntuupstream*
Linux-snapdragonUbuntuxenial*
Linux-snapdragonUbuntuyakkety*
Linux-ti-omap4Ubuntuprecise*
Linux-ti-omap4Ubuntuupstream*

Potential Mitigations

References

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