CVE-2011-3631: Hardlink before 0.1.2 has multiple integer overflows leading to heap-based buffer overflows because of the way

Q: How do I fix CVE-2011-3631?

hardlink: upgrade to 0.1.2; debian linux: mitigate or apply the listed mitigation; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2011-3631 being exploited?

CVE-2011-3631 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-2011-3631 affect?

CVE-2011-3631 affects hardlink, debian linux, enterprise linux. Severity is high (CVSS 8.8). Hardlink before 0.1.2 has multiple integer overflows leading to heap-based buffer overflows because of the way string lengths concatenation is done in the calculation of the required memory space to be used. A remote attacker could provide

Q: How urgent is CVE-2011-3631?

Priority 57/100. High severity; On your watchlist

This month

HIGH 8.8WATCHLISTUPGRADEMITIGATEMITIGATE

CVE-2011-3631 is a high-severity flaw (CVSS 8.8) affecting hardlink, debian linux, enterprise linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Hardlink before 0.1.2 has multiple integer overflows leading to heap-based buffer overflows because of the way string lengths concatenation is done in the calculation of the required memory space to be used. A remote attacker could provide a specially-crafted directory tree and trick the local user into consolidating it, leading to hardlink executable crash or potentially arbitrary code execution with user privileges.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	2.7% (top 14%)
CISA exploited list	No
Weakness	CWE-190
Published	2019-11-26
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: debian · hardlink project · redhat

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-11-26 04:15 UTCPublished CVE record published
2026-06-16 23:33 UTCUpdated Record last modified

hardlink project hardlink UPGRADE

Affected: < 0.1.2

Fixed in: 0.1.2

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.1.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade hardlink

Note

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

debian debian linux MITIGATE

Affected: 8.0 · 9.0 · 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

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.

redhat enterprise linux MITIGATE

Affected: 5.0 · 6.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0

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.

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-2011-3631?

hardlink: upgrade to 0.1.2; debian linux: mitigate or apply the listed mitigation; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2011-3631 being exploited?

CVE-2011-3631 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-2011-3631 affect?

CVE-2011-3631 affects hardlink, debian linux, enterprise linux. Severity is high (CVSS 8.8). Hardlink before 0.1.2 has multiple integer overflows leading to heap-based buffer overflows because of the way string lengths concatenation is done in the calculation of the required memory space to be used. A remote attacker could provide

How urgent is CVE-2011-3631?

Priority 57/100. High severity; On your watchlist

Software pages

Debian vulnerabilities

Related CVEs

CVE-2011-3632 HIGH 7.1 UPGRADE MITIGATE Hardlink before 0.1.2 operates on full file system objects path names which can allow a local attacker to use
CVE-2011-3630 HIGH 8.8 UPGRADE MITIGATE Hardlink before 0.1.2 suffer from multiple stack-based buffer overflow flaws because of the way directory tree

References

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