CVE-2004-0626

The tcp_find_option function of the netfilter subsystem in Linux kernel 2.6, when using iptables and TCP options rules, allows remote attackers to cause a denial of service (CPU consumption by infinite loop) via a large option length that produces a negative integer after a casting operation to the char type.

Published: 2004-12-06 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2004-0626 is rated Moderate Risk (50.5/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.76%). EPSS rose +1.02% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2004-0626

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.74% 2.76% +1.02%
2 2025-03-30 1.44% 1.74% +0.30%
3 2025-03-29 — 1.44% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2004-0626

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2004-0626

Affected software / configurations for CVE-2004-0626

Vendor Product Version Raw CPE
conectiva linux 10 cpe:2.3:o:conectiva:linux:10:*:*:*:*:*:*:*
gentoo linux — cpe:2.3:o:gentoo:linux:*:*:*:*:*:*:*:*
linux linux_kernel 2.6.0 cpe:2.3:o:linux:linux_kernel:2.6.0:*:*:*:*:*:*:*
suse suse_linux 8.0 cpe:2.3:o:suse:suse_linux:8.0:*:*:*:*:*:*:*
suse suse_linux 8.1 cpe:2.3:o:suse:suse_linux:8.1:*:*:*:*:*:*:*
suse suse_linux 8.2 cpe:2.3:o:suse:suse_linux:8.2:*:*:*:*:*:*:*
suse suse_linux 9.0 cpe:2.3:o:suse:suse_linux:9.0:*:*:*:*:*:*:*
suse suse_linux 9.1 cpe:2.3:o:suse:suse_linux:9.1:*:*:*:*:*:*:*

References for CVE-2004-0626

cvelogic Threat Intelligence