{"id":"CVE-2009-4537","url":"https://www.cyber-defence.io/tools/cve/CVE-2009-4537","generatedAt":"2026-10-27T20:41:09.894Z","title":"drivers/net/r8169.c in the r8169 driver in the Linux kernel 2.6.32.3 and earlier does not properly check the size of an Ethernet frame that exceeds the MTU, which allows remote attackers to (1) cause a denial of service (temporary network outage) via a…","description":"drivers/net/r8169.c in the r8169 driver in the Linux kernel 2.6.32.3 and earlier does not properly check the size of an Ethernet frame that exceeds the MTU, which allows remote attackers to (1) cause a denial of service (temporary network outage) via a packet with a crafted size, in conjunction with certain packets containing A characters and certain packets containing E characters; or (2) cause a denial of service (system crash) via a packet with a crafted size, in conjunction with certain packets containing '\\0' characters, related to the value of the status register and erroneous behavior associated with the RxMaxSize register.  NOTE: this vulnerability exists because of an incorrect fix for CVE-2009-1389.","published":"2010-01-12T17:30:01.000Z","lastModified":"2026-06-16T23:13:51.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"2.0","score":7.8,"severity":"HIGH","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C"},"cwe":["CWE-20"],"affected":["linux/linux kernel","debian/debian linux"],"epss":{"score":0.05889,"percentile":0.93167,"date":"2026-10-26","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 (5.89%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"http://blog.c22.cc/2009/12/27/26c3-cat-procsysnetipv4fuckups/","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://events.ccc.de/congress/2009/Fahrplan/events/3596.en.html","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://lists.fedoraproject.org/pipermail/package-announce/2010-February/035159.html","tags":["Mailing List","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://lists.opensuse.org/opensuse-security-announce/2010-07/msg00006.html","tags":["Mailing List","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://marc.info/?l=linux-netdev&m=126202972828626&w=2","tags":["Mailing List","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://marc.info/?t=126202986900002&r=1&w=2","tags":["Mailing List","Third Party 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Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2009-4537","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."}