Details
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Bug
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Resolution: Fixed
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Minor
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None
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None
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3
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9223372036854775807
Description
Security Fix(es):
- Linux kernel built with the Kernel-based Virtual Machine (CONFIG_KVM) support
is vulnerable to a null pointer dereference flaw. It could occur on x86
platform, when emulating an undefined instruction. An attacker could use this
flaw to crash the host kernel resulting in DoS. (CVE-2016-8630, Important)
- A race condition issue leading to a use-after-free flaw was found in the way
the raw packet sockets implementation in the Linux kernel networking subsystem
handled synchronization while creating the TPACKET_V3 ring buffer. A local user
able to open a raw packet socket (requires the CAP_NET_RAW capability) could use
this flaw to elevate their privileges on the system. (CVE-2016-8655, Important)
- A flaw was discovered in the Linux kernel's implementation of VFIO. An
attacker issuing an ioctl can create a situation where memory is corrupted and
modify memory outside of the expected area. This may overwrite kernel memory and
subvert kernel execution. (CVE-2016-9083, Important)
- The use of a kzalloc with an integer multiplication allowed an integer
overflow condition to be reached in vfio_pci_intrs.c. This combined with
CVE-2016-9083 may allow an attacker to craft an attack and use unallocated
memory, potentially crashing the machine. (CVE-2016-9084, Moderate)
To see the complete list of bug fixes and enhancements, refer to
the following KnowledgeBase article: https://access.redhat.com/articles/2940041.
Bugs fixed (https://bugzilla.redhat.com/):
1389258 - CVE-2016-9083 kernel: State machine confusion bug in vfio driver leading to memory corruption
1389259 - CVE-2016-9084 kernel: Integer overflow when using kzalloc in vfio driver
1393350 - CVE-2016-8630 kernel: kvm: x86: NULL pointer dereference during instruction decode
1400019 - CVE-2016-8655 kernel: Race condition in packet_set_ring leads to use after free