CVE-2009-0745

CVE-2009-0745 is a medium-severity vulnerability in Linux Linux Kernel with a CVSS 2.0 base score of 4.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

• Severity: Medium (CVSS 2.0 base score 4.9)
• EPSS exploit prediction: 0% (33rd percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-20
• Affected product: Linux Linux Kernel
• Published: 2009-02-27
• Last modified: 2026-06-16

Description

The ext4_group_add function in fs/ext4/resize.c in the Linux kernel 2.6.27 before 2.6.27.19 and 2.6.28 before 2.6.28.7 does not properly initialize the group descriptor during a resize (aka resize2fs) operation, which might allow local users to cause a denial of service (OOPS) by arranging for crafted values to be present in available memory.

Frequently asked questions

What is CVE-2009-0745?

The ext4_group_add function in fs/ext4/resize.c in the Linux kernel 2.6.27 before 2.6.27.19 and 2.6.28 before 2.6.28.7 does not properly initialize the group descriptor during a resize (aka resize2fs) operation, which might allow local users to cause a denial of service (OOPS) by arranging for crafted values to be present in available memory.

How severe is CVE-2009-0745?

CVE-2009-0745 has a CVSS 2.0 base score of 4.9, rated medium severity.

Is CVE-2009-0745 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-0745?

CVE-2009-0745 primarily affects Linux Linux Kernel. In total, 26 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-0745?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2009-0745 published?

CVE-2009-0745 was published on 2009-02-27 and last updated on 2026-06-16.

References

• http://bugzilla.kernel.org/show_bug.cgi?id=12433
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=fdff73f094e7220602cc3f8959c7230517976412
• http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.27.19
• http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.28.7
• http://rhn.redhat.com/errata/RHSA-2009-1243.html
• http://secunia.com/advisories/34394
• http://secunia.com/advisories/34981
• http://secunia.com/advisories/36562
• http://secunia.com/advisories/37471
• http://www.debian.org/security/2009/dsa-1749
• http://www.debian.org/security/2009/dsa-1787
• http://www.securityfocus.com/archive/1/507985/100/0/threaded
• http://www.ubuntu.com/usn/usn-751-1
• http://www.vmware.com/security/advisories/VMSA-2009-0016.html
• http://www.vupen.com/english/advisories/2009/0509
• http://www.vupen.com/english/advisories/2009/3316
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10942
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7765

Affected products (26)

• cpe:2.3:o:linux:linux_kernel:2.6.27:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.6.27.1:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.6.27.2:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.6.27.3:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.6.27.4:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.6.27.5:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.6.27.6:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.6.27.7:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.6.27.8:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.6.27.9:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.6.27.10:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.6.27.11:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.6.27.12:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.6.27.13:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.6.27.14:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.6.27.15:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.6.27.16:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.6.27.17:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.6.27.18:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.6.28:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.6.28.1:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.6.28.2:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.6.28.3:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.6.28.4:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.6.28.5:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.6.28.6:*:*:*:*:*:*:*

More vulnerabilities in Linux Linux Kernel

• CVE-2023-2163 — Critical (CVSS 10.0): Incorrect verifier pruning in BPF in Linux Kernel >=5.4 leads to unsafe code paths being incorrectly marked as safe,…
• CVE-2015-8104 — Critical (CVSS 10.0): The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows guest OS users to cause a…
• CVE-2015-1421 — Critical (CVSS 10.0): Use-after-free vulnerability in the sctp_assoc_update function in net/sctp/associola.c in the Linux kernel before…
• CVE-2014-2523 — Critical (CVSS 10.0): net/netfilter/nf_conntrack_proto_dccp.c in the Linux kernel through 3.13.6 uses a DCCP header pointer incorrectly,…
• CVE-2010-2495 — Critical (CVSS 10.0): The pppol2tp_xmit function in drivers/net/pppol2tp.c in the L2TP implementation in the Linux kernel before 2.6.34 does…
• CVE-2010-2521 — Critical (CVSS 10.0): Multiple buffer overflows in fs/nfsd/nfs4xdr.c in the XDR implementation in the NFS server in the Linux kernel before…

All CVEs affecting Linux Linux Kernel →

Other CWE-20 (Improper Input Validation) vulnerabilities

• CVE-2026-48316 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
• CVE-2026-48281 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
• CVE-2026-48277 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
• CVE-2026-48055 — Critical (CVSS 10.0): Streambert is a cross-platform Electron Desktop App to stream and download any video media. In versions 2.4.0 and…
• CVE-2026-34910 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS…
• CVE-2026-33587 — Critical (CVSS 10.0): Lack of user input sanitisation in Open Notebook v1.8.3 allows the application user to execute Python code (and…

Browse all CWE-20 (Improper Input Validation) vulnerabilities →