Stack-based buffer overflow in the get_matching_model_microcode function in arch/x86/kernel/cpu/microcode/intel_early.c in...

Vulnerability Description

Stack-based buffer overflow in the get_matching_model_microcode function in arch/x86/kernel/cpu/microcode/intel_early.c in the Linux kernel before 4.0 allows context-dependent attackers to gain privileges by constructing a crafted microcode header and leveraging root privileges for write access to the initrd.

References

• http://lists.fedoraproject.org/pipermail/package-announce/2015-March/153329.html
• http://www.securitytracker.com/id/1032414
• http://www.openwall.com/lists/oss-security/2015/03/20/18
• https://github.com/torvalds/linux/commit/f84598bd7c851f8b0bf8cd0d7c3be0d73c432ff4
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=f84598bd7c851f8b0bf8cd0d7c3be0d73c432ff4
• http://rhn.redhat.com/errata/RHSA-2015-1534.html
• https://bugzilla.redhat.com/show_bug.cgi?id=1204722