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Security Fix(es):
- It was discovered that a remote attacker could leverage the generation of IPv6
atomic fragments to trigger the use of fragmentation in an arbitrary IPv6 flow
(in scenarios in which actual fragmentation of packets is not needed) and could
subsequently perform any type of a fragmentation-based attack against legacy
IPv6 nodes that do not implement RFC6946. (CVE-2016-10142, Moderate)
- A flaw was discovered in the way the Linux kernel dealt with paging
structures. When the kernel invalidated a paging structure that was not in use
locally, it could, in principle, race against another CPU that is switching to a
process that uses the paging structure in question. A local user could use a
thread running with a stale cached virtual->physical translation to potentially
escalate their privileges if the translation in question were writable and the
physical page got reused for something critical (for example, a page table).
(CVE-2016-2069, Moderate)
- A race condition flaw was found in the ioctl_send_fib() function in the Linux
kernel's aacraid implementation. A local attacker could use this flaw to cause a
denial of service (out-of-bounds access or system crash) by changing a certain
size value. (CVE-2016-6480, Moderate)
- It was found that when the gcc stack protector was enabled, reading the
/proc/keys file could cause a panic in the Linux kernel due to stack corruption.
This happened because an incorrect buffer size was used to hold a 64-bit timeout
value rendered as weeks. (CVE-2016-7042, Moderate)
- It was found that when file permissions were modified via chmod and the user
modifying them was not in the owning group or capable of CAP_FSETID, the setgid
bit would be cleared. Setting a POSIX ACL via setxattr sets the file permissions
as well as the new ACL, but doesn't clear the setgid bit in a similar way. This
could allow a local user to gain group privileges via certain setgid
applications. (CVE-2016-7097, Moderate)
- A flaw was found in the Linux networking subsystem where a local attacker with
CAP_NET_ADMIN capabilities could cause an out-of-bounds memory access by
creating a smaller-than-expected ICMP header and sending to its destination via
sendto(). (CVE-2016-8399, Moderate)
- It was found that the blk_rq_map_user_iov() function in the Linux kernel's
block device implementation did not properly restrict the type of iterator,
which could allow a local attacker to read or write to arbitrary kernel memory
locations or cause a denial of service (use-after-free) by leveraging write
access to a /dev/sg device. (CVE-2016-9576, CVE-2016-10088, Moderate)
- A flaw was found in the USB-MIDI Linux kernel driver: a double-free error
could be triggered for the 'umidi' object. An attacker with physical access to
the system could use this flaw to escalate their privileges. (CVE-2016-2384,
Low)
Additional Changes:
For detailed information on changes in this release, see the Red Hat Enterprise
Linux 6.9 Release Notes and Red Hat Enterprise Linux 6.9 Technical Notes on the RedHat website.
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.9_Release_Notes/index.html
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.9_Technical_Notes/index.html
Bugs fixed (https://bugzilla.redhat.com/):
1301893 - CVE-2016-2069 kernel: race condition in the TLB flush logic
1308444 - CVE-2016-2384 kernel: double-free in usb-audio triggered by invalid USB descriptor
1325766 - RHEL6.7: NFSv3 client performance regression where ls -l takes too long with "aggressive readdirplus" commit
1362466 - CVE-2016-6480 kernel: scsi: aacraid: double fetch in ioctl_send_fib()
1368938 - CVE-2016-7097 kernel: Setting a POSIX ACL via setxattr doesn't clear the setgid bit
1373966 - CVE-2016-7042 kernel: Stack corruption while reading /proc/keys when gcc stack protector is enabled
1403145 - CVE-2016-9576 kernel: Use after free in SCSI generic device interface
1403833 - CVE-2016-8399 kernel: net: Out of bounds stack read in memcpy_fromiovec
1412210 - CVE-2016-10088 kernel: Use after free in SCSI generic device interface (CVE-2016-9576 regression)
1415908 - CVE-2016-10142 kernel - IPV6 fragmentation flaw
847106 - ext2 tests hang while running fsfuzzer
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