Description
The decode_choice function in net/netfilter/nf_conntrack_h323_asn1.c in the Linux kernel before 2.6.20.15, 2.6.21.x before 2.6.21.6, and before 2.6.22 allows remote attackers to cause a denial of service (crash) via an encoded, out-of-range index value for a choice field, which triggers a NULL pointer dereference.
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 4.0 | linux-2.6 | 2.6.18.dfsg.1-13etch1 | DSA-1356-1 |
Advisories 1
- DSA-1356-1 linux-2.6 - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
References
- 27212 third-party-advisory
- 25955 third-party-advisory
- http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.21.6
- USN-510-1 vendor-advisory
- DSA-1356 vendor-advisory
- 24818 vdb-entry
- ADV-2007-2466 vdb-entry
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=25845b5155b55cd77e42655ec24161ba3feffa47
- http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.22
- http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.20.15
- 37117 vdb-entry
- 26450 third-party-advisory
- MDKSA-2007:195 vendor-advisory