{"id":"UBUNTU-CVE-2026-75900","details":"An out-of-bounds read vulnerability was found in swtpm's SWTPM_NVRAM_CheckHeader() function. The entry guard checks the buffer length against sizeof(bh), where bh is a pointer, instead of sizeof(*bh), the actual struct size. This allows an undersized buffer to pass validation, causing a 2-byte heap overread on 64-bit systems (6 bytes on 32-bit) when accessing the totlen field. This may cause daemon termination on some platforms and leaks heap data to the log.","modified":"2026-09-11T20:53:36.169127221Z","published":"2026-08-19T08:17:00Z","upstream":["CVE-2026-75900"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-75900"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-75900"},{"type":"REPORT","url":"https://github.com/stefanberger/swtpm/pull/1155"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-75900"}],"affected":[{"package":{"name":"swtpm","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/swtpm?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.6.1-0ubuntu1","0.6.1-0ubuntu2","0.6.1-0ubuntu3","0.6.1-0ubuntu4","0.6.1-0ubuntu5","0.6.3-0ubuntu1","0.6.3-0ubuntu2","0.6.3-0ubuntu3","0.6.3-0ubuntu3.1","0.6.3-0ubuntu3.2","0.6.3-0ubuntu3.3"],"ecosystem_specific":{"binaries":[{"binary_version":"0.6.3-0ubuntu3.3","binary_name":"swtpm"},{"binary_name":"swtpm-tools","binary_version":"0.6.3-0ubuntu3.3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-75900.json"}},{"package":{"name":"swtpm","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/swtpm?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.7.3-0ubuntu2","0.7.3-0ubuntu3","0.7.3-0ubuntu5","0.7.3-0ubuntu5.24.04.1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.7.3-0ubuntu5.24.04.1","binary_name":"swtpm"},{"binary_version":"0.7.3-0ubuntu5.24.04.1","binary_name":"swtpm-tools"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-75900.json"}},{"package":{"name":"swtpm","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/swtpm?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.7.3-0ubuntu8","0.7.3-0ubuntu9","0.10.1+ds-1ubuntu2","0.10.1+ds-1ubuntu3"],"ecosystem_specific":{"binaries":[{"binary_name":"swtpm","binary_version":"0.10.1+ds-1ubuntu3"},{"binary_name":"swtpm-libs","binary_version":"0.10.1+ds-1ubuntu3"},{"binary_name":"swtpm-tools","binary_version":"0.10.1+ds-1ubuntu3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-75900.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}