{"id":"USN-8611-1","summary":"glibc vulnerabilities","details":"It was discovered that the GNU C Library iconv function incorrectly handled\ncertain IBM character sets. An attacker could possibly use this issue to\ncause a denial of service. (CVE-2026-4046)\n\nIt was discovered that the GNU C Library DNS functions incorrectly handled\ncertain DNS server responses when using gethostbyaddr or gethostbyaddr_r.\nAn attacker in a privileged network position could possibly use this issue\nto cause an application to violate DNS specification or obtain incorrect\nhostname information. This issue only affected Ubuntu 24.04 LTS.\n(CVE-2026-4437, CVE-2026-4438)\n\nIt was discovered that the GNU C Library deprecated debugging functions\nincorrectly enforced caller-supplied buffer lengths. An attacker could\npossibly use this issue to cause a denial of service or execute arbitrary\ncode. (CVE-2026-5435)\n\nIt was discovered that the GNU C Library scanf family of functions\ncontained a heap buffer overflow when processing certain format specifiers.\nAn attacker could possibly use this issue to cause a denial of service or\nexecute arbitrary code. (CVE-2026-5450)\n\nIt was discovered that the GNU C Library ungetwc function incorrectly\nhandled certain character encodings. An attacker could possibly use this\nissue to obtain sensitive information or cause a denial of service.\n(CVE-2026-5928)\n\nIt was discovered that the GNU C Library deprecated debugging functions\nincorrectly validated DNS response record data. An attacker could possibly\nuse this issue to cause a denial of service or obtain sensitive\ninformation. (CVE-2026-6238)","modified":"2026-07-27T21:14:45.559246235Z","published":"2026-07-27T12:24:25Z","related":["UBUNTU-CVE-2026-4046","UBUNTU-CVE-2026-4437","UBUNTU-CVE-2026-4438","UBUNTU-CVE-2026-5435","UBUNTU-CVE-2026-5450","UBUNTU-CVE-2026-5928","UBUNTU-CVE-2026-6238"],"upstream":["CVE-2026-4046","CVE-2026-4437","CVE-2026-4438","CVE-2026-5435","CVE-2026-5450","CVE-2026-5928","CVE-2026-6238","UBUNTU-CVE-2026-4046","UBUNTU-CVE-2026-4437","UBUNTU-CVE-2026-4438","UBUNTU-CVE-2026-5435","UBUNTU-CVE-2026-5450","UBUNTU-CVE-2026-5928","UBUNTU-CVE-2026-6238"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8611-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-4046"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-4437"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-4438"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-5435"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-5450"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-5928"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-6238"}],"affected":[{"package":{"name":"glibc","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/glibc?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.35-0ubuntu3.14"}]}],"versions":["2.34-0ubuntu3","2.35-0ubuntu1","2.35-0ubuntu3","2.35-0ubuntu3.1","2.35-0ubuntu3.3","2.35-0ubuntu3.4","2.35-0ubuntu3.5","2.35-0ubuntu3.6","2.35-0ubuntu3.7","2.35-0ubuntu3.8","2.35-0ubuntu3.9","2.35-0ubuntu3.10","2.35-0ubuntu3.11","2.35-0ubuntu3.12","2.35-0ubuntu3.13"],"ecosystem_specific":{"binaries":[{"binary_name":"glibc-source","binary_version":"2.35-0ubuntu3.14"},{"binary_name":"libc-bin","binary_version":"2.35-0ubuntu3.14"},{"binary_version":"2.35-0ubuntu3.14","binary_name":"libc-dev-bin"},{"binary_name":"libc-devtools","binary_version":"2.35-0ubuntu3.14"},{"binary_name":"libc6","binary_version":"2.35-0ubuntu3.14"},{"binary_name":"libc6-amd64","binary_version":"2.35-0ubuntu3.14"},{"binary_version":"2.35-0ubuntu3.14","binary_name":"libc6-dev-amd64"},{"binary_name":"libc6-dev-i386","binary_version":"2.35-0ubuntu3.14"},{"binary_version":"2.35-0ubuntu3.14","binary_name":"libc6-dev-s390"},{"binary_version":"2.35-0ubuntu3.14","binary_name":"libc6-dev-x32"},{"binary_version":"2.35-0ubuntu3.14","binary_name":"libc6-i386"},{"binary_name":"libc6-prof","binary_version":"2.35-0ubuntu3.14"},{"binary_version":"2.35-0ubuntu3.14","binary_name":"libc6-s390"},{"binary_version":"2.35-0ubuntu3.14","binary_name":"libc6-x32"},{"binary_version":"2.35-0ubuntu3.14","binary_name":"locales"},{"binary_name":"locales-all","binary_version":"2.35-0ubuntu3.14"},{"binary_name":"nscd","binary_version":"2.35-0ubuntu3.14"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2026-4046","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-5435","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-5450"},{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-5928"},{"id":"CVE-2026-6238","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]}],"ecosystem":"Ubuntu:22.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8611-1.json"}},{"package":{"name":"glibc","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/glibc?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.39-0ubuntu8.8"}]}],"versions":["2.38-1ubuntu6","2.38-3ubuntu1","2.39-0ubuntu1","2.39-0ubuntu2","2.39-0ubuntu6","2.39-0ubuntu8","2.39-0ubuntu8.1","2.39-0ubuntu8.2","2.39-0ubuntu8.3","2.39-0ubuntu8.4","2.39-0ubuntu8.5","2.39-0ubuntu8.6","2.39-0ubuntu8.7"],"ecosystem_specific":{"binaries":[{"binary_name":"glibc-source","binary_version":"2.39-0ubuntu8.8"},{"binary_version":"2.39-0ubuntu8.8","binary_name":"libc-bin"},{"binary_name":"libc-dev-bin","binary_version":"2.39-0ubuntu8.8"},{"binary_version":"2.39-0ubuntu8.8","binary_name":"libc-devtools"},{"binary_version":"2.39-0ubuntu8.8","binary_name":"libc6"},{"binary_name":"libc6-amd64","binary_version":"2.39-0ubuntu8.8"},{"binary_name":"libc6-dev-amd64","binary_version":"2.39-0ubuntu8.8"},{"binary_name":"libc6-dev-i386","binary_version":"2.39-0ubuntu8.8"},{"binary_name":"libc6-dev-s390","binary_version":"2.39-0ubuntu8.8"},{"binary_name":"libc6-dev-x32","binary_version":"2.39-0ubuntu8.8"},{"binary_version":"2.39-0ubuntu8.8","binary_name":"libc6-i386"},{"binary_name":"libc6-s390","binary_version":"2.39-0ubuntu8.8"},{"binary_version":"2.39-0ubuntu8.8","binary_name":"libc6-x32"},{"binary_name":"locales","binary_version":"2.39-0ubuntu8.8"},{"binary_name":"locales-all","binary_version":"2.39-0ubuntu8.8"},{"binary_version":"2.39-0ubuntu8.8","binary_name":"nscd"}],"availability":"No 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