It was found that reporting emulation failures to user space could lead to either a local (CVE-2014-7842) or a L2->L1 (CVE-2010-5313) denial of service. In the case of a local denial of service, an attacker must have access to the MMIO area or be able to access an I/O port. Please note that on certain systems, HPET is mapped to userspace as part of vdso (vvar) and thus an unprivileged user may generate MMIO transactions (and enter the emulator) this way.
An SCTP server doing ASCONF will panic on malformed INIT ping-of-death in the form of:
------------ INIT[PARAM: SETPRIMARYIP] ------------>
A remote attacker could use this flaw to crash the system by sending a maliciously prepared SCTP packet in order to trigger a NULL pointer dereference on the server.
Upstream patch:
https://git.kernel.org/cgit/linux/kernel/git/davem/net.git/commit/?id=e40607cbe270a9e8360907cb1e62ddf0736e4864
Acknowledgements:
This issue was discovered by Liu Wei of Red Hat.
It was found that Linux kernel's sctp stack is prone to remotely triggerable memory pressure issue caused by excessive queueing.
A remote attacker could use this flaw to cause denial-of-service conditions on the system.
Upstream commmit:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=26b87c7881006311828bb0ab271a551a62dcceb4
Last updated 24 July 2024
Common Vulnerabilities and Exposures assigned an identifier CVE-2014-9090 to the following vulnerability:
Name: CVE-2014-9090 URL: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-9090 Assigned: 20141126 Reference: http://www.openwall.com/lists/oss-security/2014/11/26/5 Reference: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=6f442be2fb22be02cafa606f1769fa1e6f894441 Reference: https://github.com/torvalds/linux/commit/6f442be2fb22be02cafa606f1769fa1e6f894441
The dodoublefault function in arch/x86/kernel/traps.c in the Linux kernel through 3.17.4 does not properly handle faults associated with the Stack Segment (SS) segment register when espfix64 is involved, which allows local users to cause a denial of service (panic) via a modifyldt system call, as demonstrated by sigreturn32 in the linux-clock-tests test suite.
arch/x86/kvm/vmx.c in the KVM subsystem in the Linux kernel before 3.12 does not have an exit handler for the INVEPT instruction, which allows guest OS users to cause a denial of service (guest OS crash) via a crafted application.
arch/x86/kernel/tls.c in the Thread Local Storage (TLS) implementation in the Linux kernel through 3.18.1 allows local users to bypass the espfix protection mechanism, and consequently makes it easier for local users to bypass the ASLR protection mechanism, via a crafted application that makes a setthreadarea system call and later reads a 16-bit value.
Last updated 24 July 2024
Last updated 24 July 2024
kernel/taskstats.c in the Linux kernel before 3.1 allows local users to obtain sensitive I/O statistics by sending taskstats commands to a netlink socket, as demonstrated by discovering the length of another user's password.
Last updated 24 July 2024
Last updated 24 July 2024
It was reported [1] that perf would look for configuration files in /etc/perfconfig, ~/.perfconfig, and ./config. If ./config is not a perf configuration file, perf could fail or possibly do unexpected things. If a privileged user was tricked into running perf in a directory containing a malicious ./config file, it could possibly lead to the execution of arbitrary commands.
A patch is available [2].
[1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=632923 [2] http://marc.info/?l=linux-kernel&m=131256355026183
journalunmapbuffer()'s zapbuffer: code clears a lot of buffer head state ala discardbuffer(), but does not touch Delay or Unwritten as discardbuffer() does.
This can be problematic in some areas of the ext4 code which assume that if they have found a buffer marked unwritten or delay, then it's a live one. They do not check whether a buffer is mapped, so jbd2's partial teardown can be problematic if they assume that this buffer head is still valid.
(Mounting without a journal also avoids the bug, because with no journal we go to unmapbuffer(), which does the right thing).
An unprivileged local user could use this flaw to crash the system.
Last updated 24 July 2024
Last updated 24 July 2024
Florian Weimer of the Red Hat Product Security Team discovered that hypervkvpd would exit when it processed a spoofed Netlink packet that had been sent from an untrusted local user, in the following code:
len = recvfrom(fd, kvprecvbuffer, sizeof(kvprecvbuffer), 0, addrp, &addrl);
if (len < 0 || addr.nlpid) { syslog(LOGERR, "recvfrom failed; pid:%u error:%d %s", addr.nlpid, errno, strerror(errno)); close(fd); return -1; }
Acknowledgements:
This issue was discovered by Florian Weimer of the Red Hat Product Security Team.
Last updated 24 July 2024
Last updated 24 July 2024
Last updated 24 July 2024
Last updated 24 July 2024
Last updated 24 July 2024
Last updated 24 July 2024
Last updated 24 July 2024
Last updated 24 July 2024
A NULL pointer dereference flaw has been found in the way a new node's hot-added memory is propagated to other nodes zonelists. An unprivileged local user can use this flaw to crash the system.
Upstream fix: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=08dff7b7d629807dbb1f398c68dd9cd58dd657a1
Last updated 24 July 2024
Last updated 24 July 2024
Last updated 24 July 2024
arch/x86/include/asm/pgtable.h in the Linux kernel before 3.6.2, when transparent huge pages are used, does not properly support PROTNONE memory regions, which allows local users to cause a denial of service (system crash) via a crafted application.