CVE-2006-2271: The ECNE chunk handling in Linux SCTP (lksctp) before 2.6.17 allows remote attackers to cause a denial of serv

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HIGH 7.8WATCHLISTDOWNGRADE

CVE-2006-2271 is a high-severity flaw (CVSS 7.8) affecting lksctp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The ECNE chunk handling in Linux SCTP (lksctp) before 2.6.17 allows remote attackers to cause a denial of service (kernel panic) via an unexpected chunk when the session is in CLOSED state.

Why this priority

High severity
EPSS top 9%: very likely to be exploited
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
EPSS exploit chance	4.4% (top 9%)
CISA exploited list	No
Published	2006-05-09
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: lksctp

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

Am I affected?

Timeline

2006-05-09 16:02 UTCPublished CVE record published
2026-06-16 22:24 UTCUpdated Record last modified

lksctp lksctp DOWNGRADE

Affected: 2.6.0_test1_0.7.2 · 2.6.0_test4_0.7.3 · 2.6.2_0.9.0 · 2.6.3_1.0.0 · 2.6.6_1.0.1 · 2.6.10_1.0.2 · 2.6.13_1.0.3 · 2.6.14_1.0.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.6.0_test1_0.7.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.6.0_test1_0.7.2 (Debian / Ubuntu)

apt-cache madison lksctp sudo apt install lksctp=<VERSION_BEFORE_2.6.0_test1_0.7.2> sudo apt-mark hold lksctp

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list lksctp sudo dnf downgrade lksctp-<VERSION_BEFORE_2.6.0_test1_0.7.2> sudo dnf versionlock add lksctp

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2006-2271?

lksctp: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-2271 being exploited?

CVE-2006-2271 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-2006-2271 affect?

CVE-2006-2271 affects lksctp. Severity is high (CVSS 7.8). The ECNE chunk handling in Linux SCTP (lksctp) before 2.6.17 allows remote attackers to cause a denial of service (kernel panic) via an unexpected chunk when the session is in CLOSED state.

How urgent is CVE-2006-2271?

Priority 55/100. High severity; EPSS top 9%: very likely to be exploited; On your watchlist

References

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