-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 - ------------------------------------------------------------------------- Debian Security Advisory DSA-3804-1 security@xxxxxxxxxx https://www.debian.org/security/ Salvatore Bonaccorso March 08, 2017 https://www.debian.org/security/faq - ------------------------------------------------------------------------- Package : linux CVE ID : CVE-2016-9588 CVE-2017-2636 CVE-2017-5669 CVE-2017-5986 CVE-2017-6214 CVE-2017-6345 CVE-2017-6346 CVE-2017-6348 CVE-2017-6353 Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or have other impacts. CVE-2016-9588 Jim Mattson discovered that the KVM implementation for Intel x86 processors does not properly handle #BP and #OF exceptions in an L2 (nested) virtual machine. A local attacker in an L2 guest VM can take advantage of this flaw to cause a denial of service for the L1 guest VM. CVE-2017-2636 Alexander Popov discovered a race condition flaw in the n_hdlc line discipline that can lead to a double free. A local unprivileged user can take advantage of this flaw for privilege escalation. On systems that do not already have the n_hdlc module loaded, this can be mitigated by disabling it: echo >> /etc/modprobe.d/disable-n_hdlc.conf install n_hdlc false CVE-2017-5669 Gareth Evans reported that privileged users can map memory at address 0 through the shmat() system call. This could make it easier to exploit other kernel security vulnerabilities via a set-UID program. CVE-2017-5986 Alexander Popov reported a race condition in the SCTP implementation that can be used by local users to cause a denial-of-service (crash). The initial fix for this was incorrect and introduced further security issues (CVE-2017-6353). This update includes a later fix that avoids those. On systems that do not already have the sctp module loaded, this can be mitigated by disabling it: echo >> /etc/modprobe.d/disable-sctp.conf install sctp false CVE-2017-6214 Dmitry Vyukov reported a bug in the TCP implementation's handling of urgent data in the splice() system call. This can be used by a remote attacker for denial-of-service (hang) against applications that read from TCP sockets with splice(). CVE-2017-6345 Andrey Konovalov reported that the LLC type 2 implementation incorrectly assigns socket buffer ownership. This can be used by a local user to cause a denial-of-service (crash). On systems that do not already have the llc2 module loaded, this can be mitigated by disabling it: echo >> /etc/modprobe.d/disable-llc2.conf install llc2 false CVE-2017-6346 Dmitry Vyukov reported a race condition in the raw packet (af_packet) fanout feature. Local users with the CAP_NET_RAW capability (in any user namespace) can use this for denial-of-service and possibly for privilege escalation. CVE-2017-6348 Dmitry Vyukov reported that the general queue implementation in the IrDA subsystem does not properly manage multiple locks, possibly allowing local users to cause a denial-of-service (deadlock) via crafted operations on IrDA devices. For the stable distribution (jessie), these problems have been fixed in version 3.16.39-1+deb8u2. We recommend that you upgrade your linux packages. Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/ Mailing list: debian-security-announce@xxxxxxxxxxxxxxxx -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEERkRAmAjBceBVMd3uBUy48xNDz0QFAljAOE9fFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldDQ2 NDQ0MDk4MDhDMTcxRTA1NTMxRERFRTA1NENCOEYzMTM0M0NGNDQACgkQBUy48xND z0Q3Rg/7BAWcn97hmyotDGbm1LQLrRBiyjW66+aT51IHzbKbY8y+dVUodFDOeVpt EWoisRwmeLj8A79v5GTV9Fdhu86vKt+E7N93KVeNQY8ELLxNEM+v4R0QGFbfzFpz 8CQn3kpZgQP9grMKBiY2quJNgXm18eWBDBdpQwvkOzr5AtKGNnX9nqEx6xWezA79 okdBJM88jETOWWI91njTCJIVYFhJOw1hBV+dYJVZIibR5pvjRLHRkGXhVDvE5erZ m5VehpBlmdJAuK9JoovzKenEWJmAL775nwWKIyau4P+FsQxkPzuk1sk4MrqC9ZML KShQP9FX/YbqhBDtIN/8pTK/r0zqn/L0FZc89woqdTCotzrgoRjiSjgTU37WhU66 YxfDNYzJ7EeAWH68UjiMNcABz4tlEr5U8B+eQLJYzgGeF5s37j3l0UqmWJ/6j8fB gaza8eLvw0/97Cx9Wzp7blbjaQ722z0tfKJ7NiLgGTUJU655R4XtMAcPDc8Dr8mP ocncMDy76L+B9JdTh3+KK0DsMv0YLnOK/d6LzHkGJtap/UubQZTNHIeAd472Sygm iBj/R2ZZhZRoMoWjqlmBf4ZjyVgOpofOYSWPJ/AEdgF8zkCMA1ZBmB/WXqLyvOkh WFR8Cq23dNS+GYtyqqi7jbAhEzqv36fzJ7pymr1/RrikrRwRW3E= =WOjC -----END PGP SIGNATURE-----
