CVE-2017-11176

high

Published 2017-07-11 · Modified 2026-05-13

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CVSS v3

7.8

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v4 NEW

—

not yet in upstream

VIR risk

8.8

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.

Predictions

Exploit likelihood

75%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Exploit-DB

EDB-45553 local linux

Lexfo · 2018-10-02

Linux Kernel < 4.11.8 - 'mq_notify: double sock_put()' Local Privilege Escalation

Source code queued for fetch — refresh in a moment.

OS impact

OS	Version	Status	Fixed in
sles		affected
debian	bookworm	fixed	`4.11.11-1`
debian	bullseye	fixed	`4.11.11-1`
debian	forky	fixed	`4.11.11-1`
debian	sid	fixed	`4.11.11-1`
debian	trixie	fixed	`4.11.11-1`
debian	8.0	affected
debian	9.0	affected
linux-kernel		affected	`3.2.92`

References

CWEs

CWE-416

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.