{"id":"UBUNTU-CVE-2023-5215","details":"A flaw was found in libnbd. A server can reply with a block size larger than 2^63 (the NBD spec states the size is a 64-bit unsigned value). This issue could lead to an application crash or other unintended behavior for NBD clients that doesn't treat the return value of the nbd_get_size() function correctly.","modified":"2026-01-20T17:55:13.910406Z","published":"2023-09-28T14:15:00Z","upstream":["CVE-2023-5215"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-5215"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2023-5215"},{"type":"REPORT","url":"https://listman.redhat.com/archives/libguestfs/2023-September/032635.html"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2023-5215"}],"affected":[{"package":{"name":"libnbd","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libnbd@1.2.2-1ubuntu2?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.3-1","1.2.1-2","1.2.2-1ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_name":"libnbd-dev","binary_version":"1.2.2-1ubuntu2"},{"binary_name":"libnbd-ocaml","binary_version":"1.2.2-1ubuntu2"},{"binary_name":"libnbd-ocaml-dev","binary_version":"1.2.2-1ubuntu2"},{"binary_name":"libnbd0","binary_version":"1.2.2-1ubuntu2"},{"binary_name":"nbdfuse","binary_version":"1.2.2-1ubuntu2"},{"binary_name":"python3-libnbd","binary_version":"1.2.2-1ubuntu2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-5215.json"}},{"package":{"name":"libnbd","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libnbd@1.10.5-1?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.6.3-1","1.8.5-1","1.10.2-1","1.10.5-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libnbd-bin","binary_version":"1.10.5-1"},{"binary_name":"libnbd-dev","binary_version":"1.10.5-1"},{"binary_name":"libnbd-ocaml","binary_version":"1.10.5-1"},{"binary_name":"libnbd-ocaml-dev","binary_version":"1.10.5-1"},{"binary_name":"libnbd0","binary_version":"1.10.5-1"},{"binary_name":"python3-libnbd","binary_version":"1.10.5-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-5215.json"}},{"package":{"name":"libnbd","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libnbd@1.20.0-1?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.16.4-1","1.18.1-1","1.18.2-1","1.18.2-1build1","1.18.2-2","1.18.2-2build1","1.20.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libnbd-bin","binary_version":"1.20.0-1"},{"binary_name":"libnbd-dev","binary_version":"1.20.0-1"},{"binary_name":"libnbd-ocaml","binary_version":"1.20.0-1"},{"binary_name":"libnbd-ocaml-dev","binary_version":"1.20.0-1"},{"binary_name":"libnbd0","binary_version":"1.20.0-1"},{"binary_name":"python3-libnbd","binary_version":"1.20.0-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-5215.json"}},{"package":{"name":"libnbd","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/libnbd@1.22.2-1build2?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.22.0-1","1.22.2-1build1","1.22.2-1build2"],"ecosystem_specific":{"binaries":[{"binary_name":"libnbd-bin","binary_version":"1.22.2-1build2"},{"binary_name":"libnbd-dev","binary_version":"1.22.2-1build2"},{"binary_name":"libnbd-ocaml","binary_version":"1.22.2-1build2"},{"binary_name":"libnbd-ocaml-dev","binary_version":"1.22.2-1build2"},{"binary_name":"libnbd0","binary_version":"1.22.2-1build2"},{"binary_name":"python3-libnbd","binary_version":"1.22.2-1build2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-5215.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}