Description
The ext4_fill_flex_info function in fs/ext4/super.c in the Linux kernel before 2.6.32-git6 allows user-assisted remote attackers to cause a denial of service (divide-by-zero error and panic) via a malformed ext4 filesystem containing a super block with a large FLEX_BG group size (aka s_log_groups_per_flex value).
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 | 2.6.32-41squeeze2 | DSA-2443-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5 | kernel +11 | 2.6.18-194.el5 | RHSA-2010:0178 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5.4 EUS | kernel +11 | 2.6.18-164.17.1.el5 | RHSA-2010:0380 |
Advisories 3
- RHSA-2010:0380 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2010:0178 Red Hat Security Advisory: Red Hat Enterprise Linux 5.5 kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- DSA-2443-1 linux-2.6 - several Debian Security (DSA / DLA) · Mar 9, 2026
References
- 38276 third-party-advisory
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=503358ae01b70ce6909d19dd01287093f6b6271c
- [linux-kernel] 20091209 [GIT PULL] ext4 updates for v2.6.33 mailing-list
- RHSA-2010:0380 vendor-advisory
- http://www.kernel.org/pub/linux/kernel/v2.6/snapshots/patch-2.6.32-git6.log
- oval:org.mitre.oval:def:9874 vdb-entry signature
- SUSE-SA:2010:001 vendor-advisory
- http://bugzilla.kernel.org/show_bug.cgi?id=14287
- 37658 third-party-advisory
- SUSE-SA:2010:005 vendor-advisory
- MDVSA-2011:029 vendor-advisory
- 38017 third-party-advisory