CVE-2015-0847: nbd-server.c in Network Block Device (nbd-server) before 3.11 does not properly handle signals, which allows r

Q: How do I fix CVE-2015-0847?

ubuntu linux: mitigate or apply the listed mitigation; nbd: upgrade to newer than 3.10. Exact commands for each OS are on this page.

Q: Is CVE-2015-0847 being exploited?

CVE-2015-0847 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2015-0847 affect?

CVE-2015-0847 affects ubuntu linux, nbd. Severity is high (CVSS 7.8). nbd-server.c in Network Block Device (nbd-server) before 3.11 does not properly handle signals, which allows remote attackers to cause a denial of service (deadlock) via unspecified vectors.

Q: How urgent is CVE-2015-0847?

Priority 54/100. High severity; On your watchlist

This month

HIGH 7.8WATCHLISTMITIGATEUPGRADE

CVE-2015-0847 is a high-severity flaw (CVSS 7.8) affecting ubuntu linux, nbd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

nbd-server.c in Network Block Device (nbd-server) before 3.11 does not properly handle signals, which allows remote attackers to cause a denial of service (deadlock) via unspecified vectors.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
EPSS exploit chance	3.2% (top 12%)
CISA exploited list	No
Weakness	CWE-17
Published	2015-05-29
Last modified	2026-06-17

Publisher (CNA): Debian GNU/Linux · Vendor: canonical · wouter verhelst

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2015-05-29 15:59 UTCPublished CVE record published
2026-06-17 00:21 UTCUpdated Record last modified

canonical ubuntu linux MITIGATE

Affected: 12.04 · 14.04 · 14.10 · 15.04

Fixed in: no fixed release known

Safe to downgrade to: a release before 12.04

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

wouter verhelst nbd UPGRADE

Affected: <= 3.10

Fixed in: newer than 3.10

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy nbd || rpm -q nbd || nbd --version

2. UPGRADE to newer than 3.10 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade nbd

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nbd

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2015-0847?

ubuntu linux: mitigate or apply the listed mitigation; nbd: upgrade to newer than 3.10. Exact commands for each OS are on this page.

Is CVE-2015-0847 being exploited?

CVE-2015-0847 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2015-0847 affect?

CVE-2015-0847 affects ubuntu linux, nbd. Severity is high (CVSS 7.8). nbd-server.c in Network Block Device (nbd-server) before 3.11 does not properly handle signals, which allows remote attackers to cause a denial of service (deadlock) via unspecified vectors.

How urgent is CVE-2015-0847?

Priority 54/100. High severity; On your watchlist

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References

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