CVE-2009-4021 json
The fuse_direct_io function in fs/fuse/file.c in the fuse subsystem in the Linux kernel before 2.6.32-rc7 might allow attackers to cause a…
published 2009-11-25 16 y ago modified 2026-06-16 4 mo ago also EUVD-2009-3992
- cvss
- 4.9
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 35%
- public exploits
- 0
- none known
Summary
The fuse_direct_io function in fs/fuse/file.c in the fuse subsystem in the Linux kernel before 2.6.32-rc7 might allow attackers to cause a denial of service (invalid pointer dereference and OOPS) via vectors possibly related to a memory-consumption attack.
Patch / fix
- kernel RHEL 5 2.6.18-164.11.1.el5
- kernel-PAE RHEL 5 2.6.18-164.11.1.el5
- kernel-xen RHEL 5 2.6.18-164.11.1.el5
- kernel-kdump RHEL 5 2.6.18-164.11.1.el5
- kernel-debuginfo-common RHEL 5 2.6.18-164.11.1.el5
- kernel-rt enterprise mrg 1 2.6.24.7-146.el5rt
- kernel-rt-trace enterprise mrg 1 2.6.24.7-146.el5rt
- kernel-rt-vanilla enterprise mrg 1 2.6.24.7-146.el5rt
red hat advisories RHSA-2010:0046RHSA-2010:0041
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-2009-4021 updated cvss 4.6
kernel: fuse: prevent fuse_put_request on invalid pointer
-
Red Hat MRG Realtime for RHEL 5 Server kernel-rt 2.6.24.7-146.el5rt, kernel-rt-trace 2.6.24.7-146.el5rt, kernel-rt-vanilla 2.6.24.7-146.el5rt, kernel-rt-debuginfo-common 2.6.24.7-146.el5rtfixed: vendor fix RHSA-2010:0041
-
Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-164.11.1.el5, kernel-PAE 2.6.18-164.11.1.el5, kernel-xen 2.6.18-164.11.1.el5, kernel-kdump 2.6.18-164.11.1.el5, kernel-debuginfo-common 2.6.18-164.11.1.el5 Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-164.11.1.el5, kernel-PAE 2.6.18-164.11.1.el5, kernel-xen 2.6.18-164.11.1.el5, kernel-kdump 2.6.18-164.11.1.el5, kernel-debuginfo-common 2.6.18-164.11.1.el5fixed: vendor fix RHSA-2010:0046
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
0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 2.0 | 4.9 | AV:L/AC:L/Au:N/C:N/I:N/A:C |
Classification
- Weakness
-
- CWE-399 Resource Management Errors
- Technology feeds
References
-
lists.opensuse.org
/opensuse-security-announce/2009-12/msg00002.html
vendor-advisory
-
lists.opensuse.org
/opensuse-security-announce/2010-01/msg00000.html
vendor-advisory
-
lists.opensuse.org
/opensuse-security-announce/2010-02/msg00005.html
vendor-advisory
-
lists.opensuse.org
/opensuse-security-announce/2009-12/msg00005.html
vendor-advisory
-
rhn.redhat.com
/errata/RHSA-2010-0095.html
vendor-advisory
-
rhn.redhat.com
/errata/RHSA-2010-0046.html
vendor-advisory
-
debian.org
/security/2010/dsa-2005
vendor-advisory
-
redhat.com
/support/errata/RHSA-2010-0041.html
vendor-advisory
- git.kernel.org /?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=f60311d5f7670d9539b424e4ed8b5c0872fc9e83
- kernel.org /pub/linux/kernel/v2.6/testing/ChangeLog-2.6.32-rc7
-
securityfocus.com
/bid/37069
vdb-entry
-
openwall.com
/lists/oss-security/2009/11/19/1
mailing-list
-
exchange.xforce.ibmcloud.com
/vulnerabilities/54358
vdb-entry
- support.avaya.com /css/P8/documents/100073666
-
secunia.com
/advisories/37909
third-party-advisory
- bugzilla.redhat.com /show_bug.cgi?id=538734
-
oval.cisecurity.org
/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6955
vdb-entry, signature
-
oval.cisecurity.org
/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10516
vdb-entry, signature
-
openwall.com
/lists/oss-security/2009/11/24/5
mailing-list
-
secunia.com
/advisories/38017
third-party-advisory
Sources
- CVE List CVE-2009-4021
- NVD CVE-2009-4021
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