NULL pointer dereference in Linux kernel - CVE-2011-1771
Published: September 6, 2011 / Updated: August 11, 2020
Vulnerability identifier: #VU44751
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2011-1771
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error in fs/cifs/file.c in the Linux kernel before 2.6.39 allows local users to cause a denial of service (NULL pointer dereference and BUG) or possibly have unspecified other impact by setting the O_DIRECT flag during an attempt to open a file on a CIFS filesystem. A remote attacker can perform a denial of service (DoS) attack.
How to mitigate CVE-2011-1771
Update to version 2.6.39.
Sources
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=7797069305d13252fd66cf722aa8f2cbeb3c95cd
- http://marc.info/?l=linux-cifs&m=130204357001849&w=2
- http://marc.info/?l=linux-cifs&m=130204730006155&w=2
- http://securityreason.com/securityalert/8367
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39
- http://www.openwall.com/lists/oss-security/2011/05/09/2
- https://bugzilla.redhat.com/show_bug.cgi?id=703016