NULL pointer dereference in Linux kernel ext4

1) NULL pointer dereference

EUVDB-ID: #VU91020

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2009-0748

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to NULL pointer dereference within the ext4_fill_super() function in fs/ext4/super.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:*:*:*:*:*:*:*:*

External links

https://bugzilla.kernel.org/show_bug.cgi?id=12371
https://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=4ec110281379826c5cf6ed14735e47027c3c5765
https://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.27.19
https://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.28.7
https://osvdb.org/52203
https://rhn.redhat.com/errata/RHSA-2009-1243.html
https://secunia.com/advisories/34394
https://secunia.com/advisories/36562
https://secunia.com/advisories/37471
https://www.debian.org/security/2009/dsa-1749
https://www.securityfocus.com/archive/1/507985/100/0/threaded
https://www.ubuntu.com/usn/usn-751-1
https://www.vmware.com/security/advisories/VMSA-2009-0016.html
https://www.vupen.com/english/advisories/2009/0509
https://www.vupen.com/english/advisories/2009/3316
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10683
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8526

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.