Description
net/packet/af_packet.c in the Linux kernel before 2.6.39.3 does not properly restrict user-space access to certain packet data structures associated with VLAN Tag Control Information, which allows local users to obtain potentially sensitive information via a crafted application.
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 6.0 | linux-2.6 | 2.6.32-39squeeze1 | DSA-2389-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | perf +14 | 2.6.32-131.17.1.el6 | RHSA-2011:1350 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat MRG 2 | kernel-rt +10 | 2.6.33.9-rt31.79.el6rt | RHSA-2012:0010 |
Advisories 3
- RHSA-2012:0010 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2011:1350 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- DSA-2389-1 linux-2.6 - several Debian Security (DSA / DLA) · Mar 9, 2026
References
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=13fcb7bd322164c67926ffe272846d4860196dc6
- [oss-security] 20110803 Re: CVE request: Linux kernel af_packet information leak mailing-list
- https://github.com/torvalds/linux/commit/13fcb7bd322164c67926ffe272846d4860196dc6
- https://bugzilla.redhat.com/show_bug.cgi?id=728023
- http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39.3