CVE-2016-9576
HIGHCVSS 7.8/10EPSS 0.44%
Last modified
CVE-2016-9576 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. EPSS estimates a 0.44% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.0, < 4.4.38 |
| Linux | Linux Kernel | >= 4.5, < 4.8.14 |
References
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00040.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00041.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00057.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00062.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00072.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00075.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00081.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00088.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00091.htmlMailing List, Third Party Advisory
- http://rhn.redhat.com/errata/RHSA-2017-0817.htmlThird Party Advisory
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.8.14Release Notes, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2016/12/08/19Mailing List, Patch, Third Party Advisory
- http://www.securityfocus.com/bid/94821Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2017:1842Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2077Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2669Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1403145Issue Tracking, Third Party Advisory
- https://github.com/torvalds/linux/commit/a0ac402cfcdc904f9772e1762b3fda112dcc56a0Patch, Vendor Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00040.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00041.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00057.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00062.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00072.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00075.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00081.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00088.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00091.htmlMailing List, Third Party Advisory
- http://rhn.redhat.com/errata/RHSA-2017-0817.htmlThird Party Advisory
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.8.14Release Notes, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2016/12/08/19Mailing List, Patch, Third Party Advisory
- http://www.securityfocus.com/bid/94821Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2017:1842Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2077Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2669Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1403145Issue Tracking, Third Party Advisory
- https://github.com/torvalds/linux/commit/a0ac402cfcdc904f9772e1762b3fda112dcc56a0Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2016-9576?
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.
How severe is CVE-2016-9576?
CVE-2016-9576 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.44% probability of exploitation in the next 30 days.
How do I fix CVE-2016-9576?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2016-9576?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST