The ext4_fill_super function in fs/ext4/super.c in the Linux kernel 2.6.27 before 2.6.27.19 and 2.6.28 before 2.6.28.7 does not validate the superblock configuration, which allows local users to cause a denial of service (NULL pointer dereference and OOPS) by attempting to mount a crafted ext4 filesystem.
CVE-2009-0748
NONECVSS 0.0
0.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- No confirmed exploitation signals yet
CISA-KEV: Not listedEPSS: 1%CVSS: —Exploit: NoneExposed: 0
A fix is available — apply it.
- CVSS v3
- —
- EG Score
- 0.0(none)
- EPSS
- 40.0%
- KEV
- Not listed
Published
February 27, 2009
Last Modified
April 23, 2026
References (34)
- cve@mitrehttp://bugzilla.kernel.org/show_bug.cgi?id=12371
- cve@mitrehttp://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=4ec110281379826c5cf6ed14735e47027c3c5765
- cve@mitrehttp://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.27.19
- cve@mitrehttp://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.28.7
- cve@mitrehttp://osvdb.org/52203
- cve@mitrehttp://rhn.redhat.com/errata/RHSA-2009-1243.html
- cve@mitrehttp://secunia.com/advisories/34394
- cve@mitrehttp://secunia.com/advisories/36562
- cve@mitrehttp://secunia.com/advisories/37471
- cve@mitrehttp://www.debian.org/security/2009/dsa-1749
- cve@mitrehttp://www.securityfocus.com/archive/1/507985/100/0/threaded
- cve@mitrehttp://www.ubuntu.com/usn/usn-751-1
- cve@mitrehttp://www.vmware.com/security/advisories/VMSA-2009-0016.html
- cve@mitrehttp://www.vupen.com/english/advisories/2009/0509
- cve@mitrehttp://www.vupen.com/english/advisories/2009/3316
All Vendor Advisories
(2)
Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.
Frequently asked(4)
What is CVE-2009-0748?
CVE-2009-0748 is a none vulnerability published on February 27, 2009. The ext4fillsuper function in fs/ext4/super.c in the Linux kernel 2.6.27 before 2.6.27.19 and 2.6.28 before 2.6.28.7 does not validate the superblock configuration, which allows local users to cause a denial of service (NULL pointer dereference and OOPS) by attempting to mount a crafted ext4…
When was CVE-2009-0748 disclosed?
CVE-2009-0748 was first published in the National Vulnerability Database on February 27, 2009, with the most recent update on April 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2009-0748 actively exploited?
CVE-2009-0748 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 40.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2009-0748?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-0748, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
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