CVE-2016-2549

MEDIUMNVD 6.26.2—

6.2

sound/core/hrtimer.c in the Linux kernel before 4.4.1 does not prevent recursive callback access, which allows local users to cause a denial of service (deadlock) via a crafted ioctl call.

CVSS v3: 6.2
EG Score: 6.2(medium)
EPSS: 22.0%
KEV: Not listed

Published

April 27, 2016

Last Modified

May 6, 2026

References (38)

cve@mitrehttp://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2ba1fe7a06d3624f9a7586d672b55f08f7c670f3
cve@mitrehttp://lists.opensuse.org/opensuse-security-announce/2016-03/msg00094.html
cve@mitrehttp://lists.opensuse.org/opensuse-security-announce/2016-04/msg00045.html
cve@mitrehttp://lists.opensuse.org/opensuse-security-announce/2016-08/msg00038.html
cve@mitrehttp://www.debian.org/security/2016/dsa-3503
cve@mitrehttp://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.1
cve@mitrehttp://www.openwall.com/lists/oss-security/2016/01/19/1
cve@mitrehttp://www.securityfocus.com/bid/83382
cve@mitrehttp://www.ubuntu.com/usn/USN-2929-1
cve@mitrehttp://www.ubuntu.com/usn/USN-2929-2
cve@mitrehttp://www.ubuntu.com/usn/USN-2930-1
cve@mitrehttp://www.ubuntu.com/usn/USN-2930-2
cve@mitrehttp://www.ubuntu.com/usn/USN-2930-3
cve@mitrehttp://www.ubuntu.com/usn/USN-2931-1
cve@mitrehttp://www.ubuntu.com/usn/USN-2932-1

Patch Availability(9)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	linux-image-extra-3.16.0-67-generic (3.16.0-67.87~14.04.1) @ trusty	2026-05-22	ubuntu
ubuntu	linux-image-4.2.0-34-powerpc64-smp (4.2.0-34.39) @ wily	2026-05-22	ubuntu
ubuntu	linux-image-3.13.0-83-generic-lpae (3.13.0-83.127~precise1) @ precise	2026-05-22	ubuntu
ubuntu	linux-image-extra-3.13.0-83-generic (3.13.0-83.127) @ trusty	2026-05-22	ubuntu
ubuntu	linux-image-extra-4.2.0-34-generic (4.2.0-34.39~14.04.1) @ trusty	2026-05-22	ubuntu
ubuntu	linux-image-3.2.0-1480-omap4 (3.2.0-1480.106) @ precise	2026-05-22	ubuntu
ubuntu	linux-image-3.2.0-102-virtual (3.2.0-102.142) @ precise	2026-05-22	ubuntu
ubuntu	linux-image-extra-3.19.0-56-generic (3.19.0-56.62~14.04.1) @ trusty	2026-05-22	ubuntu
ubuntu	linux-image-4.2.0-1027-raspi2 (4.2.0-1027.35) @ wily	2026-05-22	ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

All Vendor Advisories

(9)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 10× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:14 UTCEPSS rescore
2026-06-07 15:22 UTCEPSS rescore
2026-06-07 15:22 UTCEPSS rescore
2026-06-06 20:29 UTCOSV refresh
2026-06-06 13:45 UTCEPSS rescore
2026-06-05 22:44 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:10 UTCEPSS rescore
2026-06-01 13:49 UTCEPSS rescore
2026-06-01 13:49 UTCEPSS rescore
2026-05-31 22:28 UTCEPSS rescore
2026-05-31 22:28 UTCEPSS rescore
2026-05-31 00:14 UTCEPSS rescore
2026-05-29 13:41 UTCEPSS rescore
2026-05-28 13:42 UTCEPSS rescore
2026-05-28 13:42 UTCEPSS rescore
2026-05-27 13:38 UTCEPSS rescore

Frequently asked(5)

What is CVE-2016-2549?

CVE-2016-2549 is a medium vulnerability published on April 27, 2016. sound/core/hrtimer.c in the Linux kernel before 4.4.1 does not prevent recursive callback access, which allows local users to cause a denial of service (deadlock) via a crafted ioctl call.

When was CVE-2016-2549 disclosed?

CVE-2016-2549 was first published in the National Vulnerability Database on April 27, 2016, with the most recent update on May 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2016-2549 actively exploited?

CVE-2016-2549 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 22.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2016-2549?

CVE-2016-2549 has a CVSS v3 base score of 6.2 (NVD).

How do I remediate CVE-2016-2549?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-2549, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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