{"id":"CVE-2017-7979","url":"https://www.cyber-defence.io/tools/cve/CVE-2017-7979","generatedAt":"2026-10-28T20:08:00.491Z","title":"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…","description":"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.","published":"2017-04-19T23:59:00.000Z","lastModified":"2026-06-17T01:25:35.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.0","score":7.8,"severity":"HIGH","vector":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-20"],"affected":["linux/linux kernel"],"epss":{"score":0.00395,"percentile":0.33491,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.40%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"http://marc.info/?l=linux-netdev&m=149200742616349","tags":["Mailing List","Patch","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://marc.info/?l=linux-netdev&m=149200746116365","tags":["Mailing List","Patch","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://marc.info/?l=linux-netdev&m=149200746116366","tags":["Mailing List","Patch","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://marc.info/?l=linux-netdev&m=149251041420194","tags":["Mailing List","Patch","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://marc.info/?l=linux-netdev&m=149251041420195","tags":["Mailing List","Patch","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://www.securityfocus.com/bid/97969","source":"cve@mitre.org"},{"url":"https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1682368","tags":["Issue Tracking","Patch"],"source":"cve@mitre.org"},{"url":"https://bugzilla.proxmox.com/show_bug.cgi?id=1351","tags":["Issue Tracking","Patch"],"source":"cve@mitre.org"},{"url":"http://marc.info/?l=linux-netdev&m=149200742616349","tags":["Mailing List","Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://marc.info/?l=linux-netdev&m=149200746116365","tags":["Mailing List","Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://marc.info/?l=linux-netdev&m=149200746116366","tags":["Mailing List","Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://marc.info/?l=linux-netdev&m=149251041420194","tags":["Mailing List","Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://marc.info/?l=linux-netdev&m=149251041420195","tags":["Mailing List","Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/bid/97969","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1682368","tags":["Issue Tracking","Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugzilla.proxmox.com/show_bug.cgi?id=1351","tags":["Issue Tracking","Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2017-7979","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}