Description
Integer overflow in the ext4_ext_get_blocks function in fs/ext4/extents.c in the Linux kernel before 2.6.34 allows local users to cause a denial of service (BUG and system crash) via a write operation on the last block of a large file, followed by a sync operation.
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 5.0 | linux-2.6 | 2.6.26-24lenny1 | DSA-2094-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5 | kernel +12 | 2.6.18-194.17.1.el5 | RHSA-2010:0723 |
Advisories 2
- RHSA-2010:0723 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- DSA-2094-1 linux-2.6 - several issues Debian Security (DSA / DLA) · Mar 9, 2026
References
- kernel-stacksize-dos(61156) vdb-entry
- RHSA-2010:0723 vendor-advisory
- USN-1000-1 vendor-advisory
- ADV-2010-3117 vdb-entry
- 20111013 VMSA-2011-0012 VMware ESXi and ESX updates to third party libraries and ESX Service Console mailing-list
- 46397 third-party-advisory
- [oss-security] 20100817 Re: CVE request - kernel: integer overflow in ext4_ext_get_blocks() mailing-list
- [oss-security] 20100816 CVE request - kernel: integer overflow in ext4_ext_get_blocks() mailing-list
- [oss-security] 20100816 Re: CVE request - kernel: integer overflow in ext4_ext_get_blocks() mailing-list
- SUSE-SA:2010:040 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=624327
- SUSE-SA:2011:007 vendor-advisory
- MDVSA-2010:247 vendor-advisory
- ADV-2011-0298 vdb-entry
- http://www.vmware.com/security/advisories/VMSA-2011-0012.html
- http://support.avaya.com/css/P8/documents/100113326
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.34
- DSA-2094 vendor-advisory
- 42477 vdb-entry
- MDVSA-2011:029 vendor-advisory
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=731eb1a03a8445cde2cb23ecfb3580c6fa7bb690
- SUSE-SA:2010:054 vendor-advisory
- MDVSA-2010:172 vendor-advisory