RedhatCVELIST:CVE-2015-7550CVE-2015-7550
The keyctl_read_key function in security/keys/keyctl.c in the Linux kernel before 4.3.4 does not properly use a semaphore, which allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via a crafted application that leverages a race condition between keyctl_revoke and keyctl_read calls.
References
git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b4a1b4f5047e4f54e194681125c74c0aa64d637d
lists.opensuse.org/opensuse-security-announce/2016-03/msg00094.html
lists.opensuse.org/opensuse-security-announce/2016-04/msg00045.html
lists.opensuse.org/opensuse-security-announce/2016-08/msg00038.html
www.debian.org/security/2016/dsa-3434
www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.3.4
www.securityfocus.com/bid/79903
www.ubuntu.com/usn/USN-2888-1
www.ubuntu.com/usn/USN-2890-1
www.ubuntu.com/usn/USN-2890-2
www.ubuntu.com/usn/USN-2890-3
www.ubuntu.com/usn/USN-2911-1
www.ubuntu.com/usn/USN-2911-2
bugzilla.redhat.com/show_bug.cgi?id=1291197
github.com/torvalds/linux/commit/b4a1b4f5047e4f54e194681125c74c0aa64d637d
security-tracker.debian.org/tracker/CVE-2015-7550
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