{"id":"CVE-2026-88833","aliases":["AZL-108321","BELL-CVE-2026-88833","DEBIAN-CVE-2026-88833","EUVD-2026-98897","GHSA-hg7w-cw6w-99w3","UBUNTU-CVE-2026-88833","openSUSE-SU-2026:12376-1"],"status":"published","title":"Busybox: busybox: udhcpc integer underflow in dhcp packet length calculation causes denial of service","description":"A flaw was found in BusyBox's udhcpc DHCP client. When processing raw DHCP packets, the client replaces the validated packet length with an attacker-controlled value from the IP header without re-validating the minimum size. This leads to an integer underflow when subtracting header sizes, causing a subsequent memory copy with a massively oversized length. An attacker on the same network segment can send a specially crafted packet to crash the DHCP client, resulting in denial of service and loss of network connectivity.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00189,"percentile":0.08591,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-191"],"published":"2026-10-13T16:56:11Z","modified":"2026-11-09T13:06:14Z","fixes":[{"ecosystem":"Alpaquita:23","package":"busybox","fixed_in":["1.35.0-r42"],"sources":["osv"]},{"ecosystem":"Alpaquita:25","package":"busybox","fixed_in":["1.37.0-r29"],"sources":["osv"]},{"ecosystem":"Alpaquita:stream","package":"busybox","fixed_in":["1.38.0-r6"],"sources":["osv"]},{"ecosystem":"BellSoft Hardened Containers:23","package":"busybox","fixed_in":["1.35.0-r42"],"sources":["osv"]},{"ecosystem":"BellSoft Hardened Containers:25","package":"busybox","fixed_in":["1.37.0-r29"],"sources":["osv"]},{"ecosystem":"BellSoft Hardened Containers:stream","package":"busybox","fixed_in":["1.38.0-r6"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Azure Linux:3","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.36.1-28"}]}]},{"source":"osv","ecosystem":"Alpaquita:23","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.35.0-r29"},{"fixed":"1.35.0-r42"}]}]},{"source":"osv","ecosystem":"Alpaquita:25","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.37.0-r20"},{"fixed":"1.37.0-r29"}]}]},{"source":"osv","ecosystem":"Alpaquita:stream","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.36.1-r1"},{"fixed":"1.38.0-r6"}]}]},{"source":"osv","ecosystem":"BellSoft Hardened Containers:23","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.35.0-r29"},{"fixed":"1.35.0-r42"}]}]},{"source":"osv","ecosystem":"BellSoft Hardened Containers:25","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.37.0-r20"},{"fixed":"1.37.0-r29"}]}]},{"source":"osv","ecosystem":"BellSoft Hardened Containers:stream","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.36.1-r1"},{"fixed":"1.38.0-r6"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.35.0-4","1:1.35.0-4+deb12u1","1:1.36.0-1~exp1","1:1.36.1-1","1:1.36.1-2","1:1.36.1-3","1:1.36.1-3.1","1:1.36.1-4","1:1.36.1-5","1:1.36.1-6","1:1.36.1-6~exp.1","1:1.36.1-7","1:1.36.1-8","1:1.36.1-9","1:1.37.0-1","1:1.37.0-10","1:1.37.0-10.1","1:1.37.0-2","1:1.37.0-3","1:1.37.0-4","1:1.37.0-5","1:1.37.0-6","1:1.37.0-7","1:1.37.0-8","1:1.37.0-9","1:1.38.0-1","1:1.38.0-2","1:1.38.0-3"]},{"source":"osv","ecosystem":"Debian:13","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.37.0-10","1:1.37.0-10.1","1:1.37.0-6","1:1.37.0-7","1:1.37.0-8","1:1.37.0-9","1:1.38.0-1","1:1.38.0-2","1:1.38.0-3"]},{"source":"osv","ecosystem":"Debian:14","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.37.0-10","1:1.37.0-10.1","1:1.37.0-6","1:1.37.0-7","1:1.37.0-8","1:1.37.0-9","1:1.38.0-1","1:1.38.0-2","1:1.38.0-3"]},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.20.0-8.1ubuntu1","1:1.20.0-9ubuntu1","1:1.20.0-9ubuntu2","1:1.21.0-1ubuntu1","1:1.21.0-1ubuntu1.4","1:1.21.0-1ubuntu1.4+esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.22.0-15ubuntu1","1:1.22.0-15ubuntu1.4","1:1.22.0-15ubuntu1.4+esm1","1:1.22.0-15ubuntu1.4+esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.22.0-19ubuntu2","1:1.27.2-1ubuntu3","1:1.27.2-1ubuntu4","1:1.27.2-2ubuntu2","1:1.27.2-2ubuntu3","1:1.27.2-2ubuntu3.1","1:1.27.2-2ubuntu3.2","1:1.27.2-2ubuntu3.3","1:1.27.2-2ubuntu3.4","1:1.27.2-2ubuntu3.4+esm1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.30.1-4ubuntu4","1:1.30.1-4ubuntu5","1:1.30.1-4ubuntu6","1:1.30.1-4ubuntu6.1","1:1.30.1-4ubuntu6.2","1:1.30.1-4ubuntu6.3","1:1.30.1-4ubuntu6.4","1:1.30.1-4ubuntu6.5"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.30.1-6ubuntu3","1:1.30.1-7ubuntu1","1:1.30.1-7ubuntu2","1:1.30.1-7ubuntu3","1:1.30.1-7ubuntu3.1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.36.1-3ubuntu1","1:1.36.1-6ubuntu1","1:1.36.1-6ubuntu3","1:1.36.1-6ubuntu3.1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.37.0-7ubuntu1","1:1.37.0-10.1ubuntu2","1:1.37.0-10.1ubuntu3","1:1.38.0-3ubuntu1","1:1.38.0-3ubuntu3","1:1.38.0-3ubuntu4"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.37.0-4ubuntu1","1:1.37.0-7ubuntu1"]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.38.0-4.1"}]}],"bundled":8}],"products":[{"vendor":"red hat","product":"red hat enterprise linux 6"},{"vendor":"red hat","product":"red hat hardened images"}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-88833","tags":["vdb-entry","x_refsource_REDHAT","report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2531347","tags":["issue-tracking","x_refsource_REDHAT","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88833","tags":["web"]},{"url":"https://github.com/advisories/GHSA-hg7w-cw6w-99w3"},{"url":"https://docs.bell-sw.com/security/cves/CVE-2026-88833","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-88833","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-88833","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-88833","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2024-58251","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-108119","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-88829","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-88833","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-88834","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-88842","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-90954","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-92205","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-88833","title":"Busybox: busybox: udhcpc integer underflow in dhcp packet length calculation causes denial of service","description":"A flaw was found in BusyBox's udhcpc DHCP client. When processing raw DHCP packets, the client replaces the validated packet length with an attacker-controlled value from the IP header without re-validating the minimum size. This leads to an integer underflow when subtracting header sizes, causing a subsequent memory copy with a massively oversized length. An attacker on the same network segment can send a specially crafted packet to crash the DHCP client, resulting in denial of service and loss of network connectivity.","status":"published","published":"2026-10-13T16:56:11.068Z","modified":"2026-11-09T13:06:14.048Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-191"],"updated_at":"2026-11-09T14:33:34.013968Z"}],"euvd":[{"id":"EUVD-2026-98897","description":"A flaw was found in BusyBox's udhcpc DHCP client. When processing raw DHCP packets, the client replaces the validated packet length with an attacker-controlled value from the IP header without re-validating the minimum size. This leads to an integer underflow when subtracting header sizes, causing a subsequent memory copy with a massively oversized length. An attacker on the same network segment can send a specially crafted packet to crash the DHCP client, resulting in denial of service and loss of network connectivity.","status":"published","published":"2026-10-13T16:56:11Z","modified":"2026-11-09T13:06:14Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-09T15:17:14.840893Z"}],"ghsa":[{"id":"GHSA-hg7w-cw6w-99w3","title":"A flaw was found in BusyBox's udhcpc DHCP client. When processing raw DHCP packets, the client...","description":"A flaw was found in BusyBox's udhcpc DHCP client. When processing raw DHCP packets, the client replaces the validated packet length with an attacker-controlled value from the IP header without re-validating the minimum size. This leads to an integer underflow when subtracting header sizes, causing a subsequent memory copy with a massively oversized length. An attacker on the same network segment can send a specially crafted packet to crash the DHCP client, resulting in denial of service and loss of network connectivity.","status":"published","published":"2026-10-13T18:30:57Z","modified":"2026-10-13T18:31:03Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-191"],"updated_at":"2026-11-02T15:13:12.080152Z"}],"nvd":[{"id":"CVE-2026-88833","description":"A flaw was found in BusyBox's udhcpc DHCP client. When processing raw DHCP packets, the client replaces the validated packet length with an attacker-controlled value from the IP header without re-validating the minimum size. This leads to an integer underflow when subtracting header sizes, causing a subsequent memory copy with a massively oversized length. An attacker on the same network segment can send a specially crafted packet to crash the DHCP client, resulting in denial of service and loss of network connectivity.","status":"published","published":"2026-10-13T17:17:48.007Z","modified":"2026-11-09T13:17:09.13Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-191"],"updated_at":"2026-11-09T16:14:53.285868Z"}],"osv":[{"id":"BELL-CVE-2026-88833","status":"published","published":"2026-10-20T06:09:06.923417Z","modified":"2026-10-22T08:30:06.507727257Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:28:26.630331Z"},{"id":"DEBIAN-CVE-2026-88833","description":"A flaw was found in BusyBox's udhcpc DHCP client. When processing raw DHCP packets, the client replaces the validated packet length with an attacker-controlled value from the IP header without re-validating the minimum size. This leads to an integer underflow when subtracting header sizes, causing a subsequent memory copy with a massively oversized length. An attacker on the same network segment can send a specially crafted packet to crash the DHCP client, resulting in denial of service and loss of network connectivity.","status":"published","published":"2026-10-13T17:17:48.007Z","modified":"2026-11-10T09:47:37.82364844Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-10T10:26:30.347596Z"},{"id":"UBUNTU-CVE-2026-88833","description":"A flaw was found in BusyBox's udhcpc DHCP client. When processing raw DHCP packets, the client replaces the validated packet length with an attacker-controlled value from the IP header without re-validating the minimum size. This leads to an integer underflow when subtracting header sizes, causing a subsequent memory copy with a massively oversized length. An attacker on the same network segment can send a specially crafted packet to crash the DHCP client, resulting in denial of service and loss of network connectivity.","status":"published","published":"2026-10-13T17:17:00Z","modified":"2026-10-28T17:43:56Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T16:57:24.828975Z"},{"id":"AZL-108321","title":"CVE-2026-88833 affecting package busybox 1.36.1-28","description":"A flaw was found in BusyBox's udhcpc DHCP client. When processing raw DHCP packets, the client replaces the validated packet length with an attacker-controlled value from the IP header without re-validating the minimum size. This leads to an integer underflow when subtracting header sizes, causing a subsequent memory copy with a massively oversized length. An attacker on the same network segment can send a specially crafted packet to crash the DHCP client, resulting in denial of service and loss of network connectivity.","status":"published","published":"2026-10-13T17:17:48Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:18.199293Z"},{"id":"openSUSE-SU-2026:12376-1","title":"busybox-1.38.0-4.1 on GA media","description":"These are all security issues fixed in the busybox-1.38.0-4.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-11-01T00:00:00Z","modified":"2026-11-02T12:15:05.284080191Z","updated_at":"2026-11-02T16:58:41.463445Z"}]}}