Description
The sysctl functionality (sysctl.c) in Linux kernel before 2.6.14.1 allows local users to cause a denial of service (kernel oops) and possibly execute code by opening an interface file in /proc/sys/net/ipv4/conf/, waiting until the interface is unregistered, then obtaining and modifying function pointers in memory that was used for the ctl_table.
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 | 2.6.9-22.0.2.EL | RHSA-2006:0101 |
| RHEL 3 | kernel +8 | 2.4.21-37.0.1.EL | RHSA-2006:0140 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Exploit-DB 1
- Linux Kernel 2.6.x - Sysctl Unregistration Local Denial of Service EDB-26489 · dos · Nov 9, 2005 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 4
- RHSA-2006:0140 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2006:0101 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
- RHSA-2006:0140 vendor-advisory
- 18684 third-party-advisory
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.14.1
- 19369 third-party-advisory
- RHSA-2006:0101 vendor-advisory
- ADV-2005-2359 vdb-entry
- 17541 third-party-advisory
- DSA-1018 vendor-advisory
- FLSA:157459-2 vendor-advisory
- 1015434 vdb-entry
- 20676 vdb-entry
- FLSA:157459-4 vendor-advisory
- USN-219-1 vendor-advisory
- 17648 third-party-advisory
- RHSA-2006:0190 vendor-advisory
- 18510 third-party-advisory
- FLSA:157459-1 vendor-advisory
- kernel-sysctl-interface-dos(23040) vdb-entry
- FLSA:157459-3 vendor-advisory
- DSA-1017 vendor-advisory
- oval:org.mitre.oval:def:10746 vdb-entry signature
- 17504 third-party-advisory
- MDKSA-2006:059 vendor-advisory
- 19374 third-party-advisory
- RHSA-2006:0191 vendor-advisory
- 18562 third-party-advisory
- 15365 vdb-entry