CVE-2016-2543: The snd_seq_ioctl_remove_events function in sound/core/seq/seq_clientmgr.c in the Linux kernel before 4.4.1 does not verify FIFO assignment…
Noroxi assessment
Priority: Monitor (action score 24/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.52% (FIRST EPSS).
- Someone with local access to the system can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: linux (Debian:12) 4.4.2-1; linux (Debian:7) 3.2.73-2+deb7u3; linux (Debian:8) 3.16.7-ckt20-1+deb8u4.
Low priority for now. Upgrade to linux (Debian:12) 4.4.2-1; linux (Debian:7) 3.2.73-2+deb7u3; linux (Debian:8) 3.16.7-ckt20-1+deb8u4 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
The snd_seq_ioctl_remove_events function in sound/core/seq/seq_clientmgr.c in the Linux kernel before 4.4.1 does not verify FIFO assignment before proceeding with FIFO clearing, which allows local users to cause a denial of service (NULL pointer dereference and OOPS) via a crafted ioctl call.
- Published
- Apr 27, 2016
- Updated
- Jun 16, 2026
- EPSS
- 0.5% · 44th percentile
- CWE
- —
Report tools
Action score
24
Low priority for now.
- CVSS
- 24 / 40 · 6.2 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.5%
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
Is your version affected? Check itNoroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernelup to 4.4 inclusive
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 4.4.2-1 | 4.4.2-1 |
| Debian:7 | linux | before 3.2.73-2+deb7u3 | 3.2.73-2+deb7u3 |
| Debian:8 | linux | before 3.16.7-ckt20-1+deb8u4 | 3.16.7-ckt20-1+deb8u4 |
| SUSE:Linux Enterprise Desktop 11 SP4 | kernel-default | before 3.0.101-71.1 | 3.0.101-71.1 |
| SUSE:Linux Enterprise Desktop 11 SP4 | kernel-pae | before 3.0.101-71.1 | 3.0.101-71.1 |
| SUSE:Linux Enterprise Desktop 11 SP4 | kernel-source | before 3.0.101-71.1 | 3.0.101-71.1 |
| SUSE:Linux Enterprise Desktop 11 SP4 | kernel-syms | before 3.0.101-71.1 | 3.0.101-71.1 |
| SUSE:Linux Enterprise Desktop 11 SP4 | kernel-trace | before 3.0.101-71.1 | 3.0.101-71.1 |
| SUSE:Linux Enterprise Desktop 11 SP4 | kernel-xen | before 3.0.101-71.1 | 3.0.101-71.1 |
| SUSE:Linux Enterprise Real Time 11 SP4 | kernel-rt | before 3.0.101.rt130-51.1 | 3.0.101.rt130-51.1 |
| SUSE:Linux Enterprise Real Time 11 SP4 | kernel-rt_trace | before 3.0.101.rt130-51.1 | 3.0.101.rt130-51.1 |
| SUSE:Linux Enterprise Real Time 11 SP4 | kernel-source-rt | before 3.0.101.rt130-51.1 | 3.0.101.rt130-51.1 |
| SUSE:Linux Enterprise Real Time 11 SP4 | kernel-syms-rt | before 3.0.101.rt130-51.1 | 3.0.101.rt130-51.1 |
| SUSE:Linux Enterprise Server 11 SP4 | kernel-ec2 | before 3.0.101-71.1 | 3.0.101-71.1 |
| SUSE:Linux Enterprise Server 11 SP4 | kernel-ppc64 | before 3.0.101-71.1 | 3.0.101-71.1 |
| SUSE:Linux Enterprise Software Development Kit 11 SP4 | kernel-docs | before 3.0.101-71.2 | 3.0.101-71.2 |
Same product
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Published before and after this one in the same product
- ← EarlierCVE-2016-2383Apr 27, 2016 · The adjust_branches function in kernel/bpf/verifier.c in the Linux kernel before 4.5 does not consider the delta in the backward-jump case…22Monitor
- ← EarlierCVE-2016-2384Apr 27, 2016 · Double free vulnerability in the snd_usbmidi_create function in sound/usb/midi.c in the Linux kernel before 4.5 allows physically proximate…19Monitor
- Later →CVE-2016-2544Apr 27, 2016 · Race condition in the queue_delete function in sound/core/seq/seq_queue.c in the Linux kernel before 4.4.1 allows local users to cause a…20Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:linux | 4.4.2-1 · Debian:12 | Package registry (OSV) |
| suse:kernel-default | 3.0.101-71.1 · SUSE:Linux Enterprise Desktop 11 SP4 | Package registry (OSV) |
| suse:kernel-docs | 3.0.101-71.2 · SUSE:Linux Enterprise Software Development Kit 11 SP4 | Package registry (OSV) |
| suse:kernel-ec2 | 3.0.101-71.1 · SUSE:Linux Enterprise Server 11 SP4 | Package registry (OSV) |
| suse:kernel-pae | 3.0.101-71.1 · SUSE:Linux Enterprise Desktop 11 SP4 | Package registry (OSV) |
| suse:kernel-ppc64 | 3.0.101-71.1 · SUSE:Linux Enterprise Server 11 SP4 | Package registry (OSV) |
| suse:kernel-rt | 3.0.101.rt130-51.1 · SUSE:Linux Enterprise Real Time 11 SP4 | Package registry (OSV) |
| suse:kernel-rt_trace | 3.0.101.rt130-51.1 · SUSE:Linux Enterprise Real Time 11 SP4 | Package registry (OSV) |
| suse:kernel-source | 3.0.101-71.1 · SUSE:Linux Enterprise Desktop 11 SP4 | Package registry (OSV) |
| suse:kernel-source-rt | 3.0.101.rt130-51.1 · SUSE:Linux Enterprise Real Time 11 SP4 | Package registry (OSV) |
| suse:kernel-syms | 3.0.101-71.1 · SUSE:Linux Enterprise Desktop 11 SP4 | Package registry (OSV) |
| suse:kernel-trace | 3.0.101-71.1 · SUSE:Linux Enterprise Desktop 11 SP4 | Package registry (OSV) |
| suse:kernel-xen | 3.0.101-71.1 · SUSE:Linux Enterprise Desktop 11 SP4 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Not on record for this CVE: EPSS history · researcher credit · variant or chain candidate · public bounty program.
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
—
CVSS vector
CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log (1)
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (19 more)Show less
- lists.opensuse.org/opensuse-security-announce/2016-03/msg00094.html
- lists.opensuse.org/opensuse-security-announce/2016-04/msg00045.html
- lists.opensuse.org/opensuse-security-announce/2016-08/msg00038.html
- www.debian.org/security/2016/dsa-3503
- www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.1
- www.openwall.com/lists/oss-security/2016/01/19/1
- www.securityfocus.com/bid/83377
- www.securitytracker.com/id/1035304
- www.ubuntu.com/usn/USN-2929-1
- www.ubuntu.com/usn/USN-2929-2
- www.ubuntu.com/usn/USN-2930-1
- www.ubuntu.com/usn/USN-2930-2
- www.ubuntu.com/usn/USN-2930-3
- www.ubuntu.com/usn/USN-2931-1
- www.ubuntu.com/usn/USN-2932-1
- www.ubuntu.com/usn/USN-2967-1
- www.ubuntu.com/usn/USN-2967-2
- bugzilla.redhat.com/show_bug.cgi?id=1311554
- github.com/torvalds/linux/commit/030e2c78d3a91dd0d27fef37e91950dde333eba1
Vendor advisories and official records. Exploit/PoC links are deliberately left out.