A security issue has been reported in the Linux Kernel, which can be exploited by malicious, local users to potentially cause a DoS (Denial of Service) or gain escalated privileges.
The security issue is caused due to the kernel accepting certain 32bit parameters passed in a 64bit register from userspace without ensuring that the value is correctly sign extended. This may be exploited to crash a system or potentially gain escalated privileges by passing specially crafted parameters to affected system calls.
Reportedly, the following architectures use a vulnerable ABI system when running a 64bit kernel and a 64bit userspace:
Solution: Update to version 126.96.36.199 or 188.8.131.52 for the s390 and PowerPC (64bit) architectures, version 184.108.40.206 for the SPARC64 architecture, and version 2.6.29 for the MIPS architecture. Update to version 3.0.33, 3.2.19, or 3.3.8 for the TILE-Gx architecture.
Provided and/or discovered by: Red Hat credits Christian Borntraeger.
Original Advisory: Red Hat:
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Subject: Linux Kernel 64bit ABI System Call Parameter Sign Extension Security Issue
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