{"id":"CVE-2009-1243","aliases":["BELL-CVE-2009-1243","EUVD-2009-1242","GHSA-p5fc-ww5c-rrv7"],"status":"published","title":"net/ipv4/udp.c in the Linux kernel before 2.6.29.1 performs an unlocking step in certain...","description":"net/ipv4/udp.c in the Linux kernel before 2.6.29.1 performs an unlocking step in certain incorrect circumstances, which allows local users to cause a denial of service (panic) by reading zero bytes from the /proc/net/udp file and unspecified other files, related to the \"udp seq_file infrastructure.\"","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.00267,"percentile":0.18972,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-20","CWE-667"],"published":"2009-04-06T14:00:00Z","modified":"2026-06-16T23:06:50Z","products":[{"vendor":"linux","product":"linux_kernel"}],"references":[{"url":"http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.29.1","tags":["x_refsource_CONFIRM","x_transferred","Broken Link"]},{"url":"http://secunia.com/advisories/34478","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","Broken Link","Third Party Advisory"]},{"url":"http://openwall.com/lists/oss-security/2009/04/01/4","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Patch","Third Party Advisory"]},{"url":"http://www.securityfocus.com/bid/34329","tags":["vdb-entry","x_refsource_BID","x_transferred","Broken Link","Patch","Third Party Advisory","VDB Entry"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/49595","tags":["vdb-entry","x_refsource_XF","x_transferred","Third Party Advisory","VDB Entry"]},{"url":"http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=30842f2989aacfaba3ccb39829b3417be9313dbe","tags":["x_refsource_CONFIRM","x_transferred","Broken Link"]},{"url":"http://vigilance.fr/vulnerability/Linux-kernel-denial-of-service-via-proc-net-udp-8586","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory"]},{"url":"http://www.vupen.com/english/advisories/2009/0924","tags":["vdb-entry","x_refsource_VUPEN","x_transferred","Broken Link","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2009-1243"},{"url":"http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=30842f2989aacfaba3ccb39829b3417be9313dbe"},{"url":"https://github.com/advisories/GHSA-p5fc-ww5c-rrv7"},{"url":"https://docs.bell-sw.com/security/cves/CVE-2009-1243","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2009-1243","description":"net/ipv4/udp.c in the Linux kernel before 2.6.29.1 performs an unlocking step in certain incorrect circumstances, which allows local users to cause a denial of service (panic) by reading zero bytes from the /proc/net/udp file and unspecified other files, related to the \"udp seq_file infrastructure.\"","status":"published","published":"2009-04-06T14:00:00Z","modified":"2024-08-07T05:04:49.339Z","updated_at":"2026-11-02T14:33:25.126493Z"}],"euvd":[{"id":"EUVD-2009-1242","description":"net/ipv4/udp.c in the Linux kernel before 2.6.29.1 performs an unlocking step in certain incorrect circumstances, which allows local users to cause a denial of service (panic) by reading zero bytes from the /proc/net/udp file and unspecified other files, related to the \"udp seq_file infrastructure.\"","status":"published","published":"2009-04-06T14:00:00Z","modified":"2024-08-07T05:04:49Z","updated_at":"2026-11-03T01:39:22.412498Z"}],"ghsa":[{"id":"GHSA-p5fc-ww5c-rrv7","title":"net/ipv4/udp.c in the Linux kernel before 2.6.29.1 performs an unlocking step in certain...","description":"net/ipv4/udp.c in the Linux kernel before 2.6.29.1 performs an unlocking step in certain incorrect circumstances, which allows local users to cause a denial of service (panic) by reading zero bytes from the /proc/net/udp file and unspecified other files, related to the \"udp seq_file infrastructure.\"","status":"published","published":"2022-05-02T03:23:05Z","modified":"2026-03-23T05:09:18Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-20","CWE-667"],"updated_at":"2026-11-02T15:06:47.740951Z"}],"nvd":[{"id":"CVE-2009-1243","description":"net/ipv4/udp.c in the Linux kernel before 2.6.29.1 performs an unlocking step in certain incorrect circumstances, which allows local users to cause a denial of service (panic) by reading zero bytes from the /proc/net/udp file and unspecified other files, related to the \"udp seq_file infrastructure.\"","status":"published","published":"2009-04-06T14:30:00.407Z","modified":"2026-06-16T23:06:50.773Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":2.1,"vector":"AV:L/AC:L/Au:N/C:N/I:N/A:P","level":"low","assessor":"primary"}],"cwes":["CWE-667"],"updated_at":"2026-11-02T14:01:34.44527Z"}],"osv":[{"id":"BELL-CVE-2009-1243","title":"CVE-2009-1243 does not affect BellSoft software","status":"withdrawn","published":"2009-04-06T14:30:00Z","modified":"2026-01-26T09:47:49.244267Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:28:12.886815Z"}]}}