Description
The netfilter/iptables module in Linux before 2.6.8.1 allows remote attackers to cause a denial of service (kernel crash) or bypass firewall rules via crafted packets, which are not properly handled by the skb_checksum_help function.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 3.1 | kernel-source-2.4.27 | 2.4.27-10sarge2 | DSA-1018-1 |
| Debian 3.1 | kernel-source-2.6.8 | 2.6.8-16sarge2 | DSA-1017-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 4 | kernel +6 | 2.6.9-5.0.5.EL | RHSA-2005:366 |
| RHEL 3 | kernel +8 | 2.4.21-27.0.4.EL | RHSA-2005:293 |
Advisories 4
- RHSA-2005:366 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2005:293 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-1017-1 kernel-source-2.6.8 - several Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-1018-1 kernel-source-2.4.27 - several Debian Security (DSA / DLA) · Mar 9, 2026
References
- oval:org.mitre.oval:def:10753 vdb-entry signature
- RHSA-2005:366 vendor-advisory
- RHSA-2005:283 vendor-advisory
- 19369 third-party-advisory
- SUSE-SA:2005:018 vendor-advisory
- DSA-1018 vendor-advisory
- 19607 third-party-advisory
- USN-82-1 vendor-advisory
- 12598 vdb-entry
- MDKSA-2005:218 vendor-advisory
- FLSA:152532 vendor-advisory
- [netdev] 20050124 Re: skb_checksum_help mailing-list
- RHSA-2005:293 vendor-advisory
- RHSA-2005:284 vendor-advisory
- DSA-1017 vendor-advisory
- 19374 third-party-advisory
- CLA-2005:945 vendor-advisory