The dvb_ca_ioctl function in drivers/media/dvb/ttpci/av7110_ca.c in the Linux kernel before 2.6.38-rc2 does not check the sign of a certain integer field, which allows local users to cause a denial of service (memory corruption) or possibly have unspecified other impact via a negative value.

References

• https://nvd.nist.gov/vuln/detail/CVE-2011-0521
• https://exchange.xforce.ibmcloud.com/vulnerabilities/64988
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=cb26a24ee9706473f31d34cc259f4dcf45cd0644
• http://openwall.com/lists/oss-security/2011/01/24/2
• http://openwall.com/lists/oss-security/2011/01/25/2
• http://secunia.com/advisories/43009
• http://secunia.com/advisories/46397
• http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.38-rc2
• http://www.securityfocus.com/archive/1/520102/100/0/threaded
• http://www.securityfocus.com/bid/45986
• http://www.securitytracker.com/id?1025195
• http://www.vmware.com/security/advisories/VMSA-2011-0012.html
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=cb26a24ee9706473f31d34cc259f4dcf45cd0644