{"id":"UBUNTU-CVE-2026-91018","details":"lwIP (Lightweight IP) has a double free vulnerability, which could crash the system, cause a DoS, memory corruption, or allow code execution on the victim system.","modified":"2026-09-24T02:03:09.118840204Z","published":"2026-09-22T21:17:00Z","upstream":["CVE-2026-91018"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-91018"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-91018"},{"type":"REPORT","url":"https://cgit.git.savannah.gnu.org/cgit/lwip.git"},{"type":"REPORT","url":"https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-265-02.json"},{"type":"REPORT","url":"https://www.cisa.gov/news-events/ics-advisories/icsa-26-265-02"}],"affected":[{"package":{"name":"lwip","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/lwip?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.1.2-3","2.1.2-5.1","2.1.2+dfsg1-1","2.1.2+dfsg1-4","2.1.2+dfsg1-4ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"liblwip0","binary_version":"2.1.2+dfsg1-4ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-91018.json"}},{"package":{"name":"lwip","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/lwip?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.1.2+dfsg1-8","2.1.2+dfsg1-9","2.1.3+dfsg1-1","2.1.3+dfsg1-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.1.3+dfsg1-1ubuntu0.1~esm1","binary_name":"liblwip0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-91018.json"}},{"package":{"name":"lwip","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/lwip?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.1.3+dfsg1-2","2.1.3+dfsg1-4","2.2.0+dfsg1-2","2.2.0+dfsg1-3","2.2.0+dfsg1-4","2.2.0+dfsg1-5","2.2.0+dfsg1-6","2.2.0+dfsg1-6.1","2.2.0+dfsg1-6.1build1","2.2.0+dfsg1-6.1build2","2.2.0+dfsg1-6.1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"liblwip0t64","binary_version":"2.2.0+dfsg1-6.1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-91018.json"}},{"package":{"name":"lwip","ecosystem":"Ubuntu:Pro:26.04:LTS","purl":"pkg:deb/ubuntu/lwip?arch=source&distro=esm-apps%2Fresolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.1+dfsg1-2","2.2.1+dfsg1-3","2.2.1+dfsg1-4","2.2.1+dfsg1-4ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"liblwip0t64","binary_version":"2.2.1+dfsg1-4ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-91018.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}