What’s Vulnerable › Vulnerabilities

CVE-2017-11176

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2017-07-11 · updated 2026-06-17
• Weakness: CWE-416

Description

The mq_notify function in the Linux kernel through 4.11.9 does not set the sock pointer to NULL upon entry into the retry logic. During a user-space close of a Netlink socket, it allows attackers to cause a denial of service (use-after-free) or possibly have unspecified other impact.

Affected products

• Debian Linux: 8.0, 9.0
• Linux kernel: before 3.2.92; from 3.3 before 3.16.47; from 3.17 before 3.18.61; from 3.19 before 4.1.43; from 4.2 before 4.4.77; from 4.5 before 4.9.38 — fixed in 3.16.47, 3.18.61, 3.2.92, 4.1.43, 4.11.11, 4.12.2

How to fix

Upgrade to a fixed version: Linux kernel 3.16.47, 3.18.61, 3.2.92, 4.1.43. Check the vendor advisory for mitigations.

References

• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f991af3daabaecff34684fd51fac80319d1baad1
• http://www.debian.org/security/2017/dsa-3927
• http://www.debian.org/security/2017/dsa-3945
• http://www.securityfocus.com/bid/99919
• https://access.redhat.com/errata/RHSA-2017:2918
• https://access.redhat.com/errata/RHSA-2017:2930
• https://access.redhat.com/errata/RHSA-2017:2931
• https://access.redhat.com/errata/RHSA-2018:0169
• https://access.redhat.com/errata/RHSA-2018:3822
• https://github.com/torvalds/linux/commit/f991af3daabaecff34684fd51fac80319d1baad1
• https://help.ecostruxureit.com/display/public/UADCE725/Security+fixes+in+StruxureWare+Data+Center+Expert+v7.6.0
• https://www.exploit-db.com/exploits/45553/

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