{"id":"UBUNTU-CVE-2017-7979","details":"The cookie feature in the packet action API implementation in net/sched/act_api.c in the Linux kernel 4.11.x through 4.11-rc7 mishandles the tb nlattr array, which allows local users to cause a denial of service (uninitialized memory access and refcount underflow, and system hang or crash) or possibly have unspecified other impact via \"tc filter add\" commands in certain contexts. NOTE: this does not affect stable kernels, such as 4.10.x, from kernel.org.","modified":"2026-02-04T03:53:03.016123Z","published":"2017-04-19T00:00:00Z","withdrawn":"2025-07-18T16:43:58Z","related":["USN-3314-1"],"upstream":["CVE-2017-7979"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2017-7979"},{"type":"REPORT","url":"http://marc.info/?l=linux-netdev&m=149200742616349"},{"type":"REPORT","url":"http://marc.info/?l=linux-netdev&m=149200746116365"},{"type":"REPORT","url":"http://marc.info/?l=linux-netdev&m=149200746116366"},{"type":"REPORT","url":"http://marc.info/?l=linux-netdev&m=149251041420194"},{"type":"REPORT","url":"http://marc.info/?l=linux-netdev&m=149251041420195"},{"type":"REPORT","url":"https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1682368"},{"type":"REPORT","url":"https://bugzilla.proxmox.com/show_bug.cgi?id=1351"},{"type":"REPORT","url":"http://marc.info/?l=linux-netdev&m=149272038713473&w=2"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3314-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2017-7979"}],"affected":[{"package":{"name":"linux-azure","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/linux-azure@4.15.0-1023.24~14.04.1?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.0-1023.24~14.04.1"}]}],"ecosystem_specific":{"binaries":[{"binary_name":"linux-azure-cloud-tools-4.15.0-1023","binary_version":"4.15.0-1023.24~14.04.1"},{"binary_name":"linux-azure-cloud-tools-4.15.0-1023-dbgsym","binary_version":"4.15.0-1023.24~14.04.1"},{"binary_version":"4.15.0-1023.24~14.04.1","binary_name":"linux-azure-headers-4.15.0-1023"},{"binary_name":"linux-azure-tools-4.15.0-1023","binary_version":"4.15.0-1023.24~14.04.1"},{"binary_name":"linux-azure-tools-4.15.0-1023-dbgsym","binary_version":"4.15.0-1023.24~14.04.1"},{"binary_name":"linux-cloud-tools-4.15.0-1023-azure","binary_version":"4.15.0-1023.24~14.04.1"},{"binary_name":"linux-headers-4.15.0-1023-azure","binary_version":"4.15.0-1023.24~14.04.1"},{"binary_version":"4.15.0-1023.24~14.04.1","binary_name":"linux-image-unsigned-4.15.0-1023-azure"},{"binary_name":"linux-image-unsigned-4.15.0-1023-azure-dbgsym","binary_version":"4.15.0-1023.24~14.04.1"},{"binary_name":"linux-modules-4.15.0-1023-azure","binary_version":"4.15.0-1023.24~14.04.1"},{"binary_name":"linux-modules-extra-4.15.0-1023-azure","binary_version":"4.15.0-1023.24~14.04.1"},{"binary_name":"linux-tools-4.15.0-1023-azure","binary_version":"4.15.0-1023.24~14.04.1"}],"availability":"No 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