The mext_check_arguments function in fs/ext4/move_extent.c in the Linux kernel before 2.6.35 allows local users to overwrite an append-only…

published 2010-09-08 16y ago modified 2026-06-16 4mo ago also EUVD-2010-2085

cvss: 5.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits: 0; none known

The mext_check_arguments function in fs/ext4/move_extent.c in the Linux kernel before 2.6.35 allows local users to overwrite an append-only file via a MOVE_EXT ioctl call that specifies this file as a donor.

Patch / fix

fixed in 1 distros 2 links 4

linux linux_kernel 2.6.35

red hat opensuse

kernel RHEL 5 2.6.18-194.11.1.el5
kernel-PAE RHEL 5 2.6.18-194.11.1.el5
kernel-xen RHEL 5 2.6.18-194.11.1.el5
kernel-kdump RHEL 5 2.6.18-194.11.1.el5
kernel-debuginfo-common RHEL 5 2.6.18-194.11.1.el5

red hat advisories RHSA-2010:0610

kernel-source openSUSE Tumbleweed 4.8.13-1.1

opensuse advisories openSUSE-SU-2024:10128-1

openwall.com/lists/oss-security/2010/06/07/1 advisory
openwall.com/lists/oss-security/2010/06/09/1 advisory
bugzilla.redhat.com/show_bug.cgi?id=601006 advisory
vmware.com/security/advisories/VMSA-2011-0003.html advisory

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2010-2066 updated 2025-11-21 cvss 1.9

kernel: ext4: Make sure the MOVE_EXT ioctl can't overwrite append-only files

Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-194.11.1.el5, kernel-PAE 2.6.18-194.11.1.el5, kernel-xen 2.6.18-194.11.1.el5, kernel-kdump 2.6.18-194.11.1.el5, kernel-debuginfo-common 2.6.18-194.11.1.el5 Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-194.11.1.el5, kernel-PAE 2.6.18-194.11.1.el5, kernel-xen 2.6.18-194.11.1.el5, kernel-kdump 2.6.18-194.11.1.el5, kernel-debuginfo-common 2.6.18-194.11.1.el5
fixed: vendor fix RHSA-2010:0610

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.38% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
NVD	2.0	2.1	AV:L/AC:L/Au:N/C:N/I:P/A:N

Classification

Technology feeds

Linux kernel rss critical rss

References

openwall.com /lists/oss-security/2010/06/07/1
mailing-list, patch, third-party-advisory
openwall.com /lists/oss-security/2010/06/09/1
mailing-list, patch, third-party-advisory
bugzilla.redhat.com /show_bug.cgi?id=601006
issue-tracking, patch, third-party-advisory
vmware.com /security/advisories/VMSA-2011-0003.html
patch, third-party-advisory
redhat.com /support/errata/RHSA-2010-0610.html
vendor-advisory, broken-link
ubuntu.com /usn/USN-1000-1
vendor-advisory, third-party-advisory
lists.opensuse.org /opensuse-security-announce/2010-08/msg00000.html
vendor-advisory, mailing-list, third-party-advisory
kernel.org /pub/linux/kernel/v2.6/ChangeLog-2.6.35
broken-link
git.kernel.org /?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=1f5a81e41f8b1a782c68d3843e9ec1bfaadf7d72
secunia.com /advisories/43315
third-party-advisory, broken-link
securityfocus.com /archive/1/516397/100/0/threaded
mailing-list, third-party-advisory, vdb-entry

Sources

CVE List CVE-2010-2066
NVD CVE-2010-2066

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.