{"id":"UBUNTU-CVE-2026-89092","details":"The nscd service in the GNU C Library 2.3.4 onwards may crash due to a stack overflow when a malicious DNS server returns too large a response for a DNS query, resulting in degraded DNS resolution for the system. Exploitation of this bug needs a system that has nscd enabled and using an untrusted DNS server for name resolution, with the compromised DNS server being capable of processing records large enough to result in a stack overflow in an nscd thread stack.  During experimentation, bind 9 was unable to handle large records, but that could change in future or with a different name server.  In typical installations, nscd is executed in an isolated context as its own user without a shell, due to which any compromise of that service is isolated. There is a remote possibility of nscd cache corruption if an attacker manages to get the stack pointer into a desired point in the heap, potentially resulting in other caches in nscd being overwritten with corrupt data through the stack overflow, until the buggy code path eventually results in a crash. Finally, a crash in nscd may result in performance degradation when resolving names, but it does not result in a denial of service.","modified":"2026-09-16T11:43:12Z","published":"2026-09-11T02:18:00Z","upstream":["CVE-2026-89092"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-89092"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-89092"},{"type":"REPORT","url":"https://sourceware.org/bugzilla/show_bug.cgi?id=34624"},{"type":"REPORT","url":"https://sourceware.org/git/?p=glibc.git;a=blob;f=advisories/GLIBC-SA-2026-0016"},{"type":"REPORT","url":"https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0016"},{"type":"REPORT","url":"http://www.openwall.com/lists/oss-security/2026/09/11/2"}],"affected":[{"package":{"name":"eglibc","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/eglibc?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.17-93ubuntu4","2.18-0ubuntu1","2.18-0ubuntu2","2.18-0ubuntu4","2.18-0ubuntu5","2.18-0ubuntu6","2.18-0ubuntu7","2.19-0ubuntu2","2.19-0ubuntu3","2.19-0ubuntu4","2.19-0ubuntu5","2.19-0ubuntu6","2.19-0ubuntu6.1","2.19-0ubuntu6.3","2.19-0ubuntu6.4","2.19-0ubuntu6.5","2.19-0ubuntu6.6","2.19-0ubuntu6.7","2.19-0ubuntu6.8","2.19-0ubuntu6.9","2.19-0ubuntu6.10","2.19-0ubuntu6.11","2.19-0ubuntu6.13","2.19-0ubuntu6.14","2.19-0ubuntu6.15","2.19-0ubuntu6.15+esm1","2.19-0ubuntu6.15+esm2","2.19-0ubuntu6.15+esm3","2.19-0ubuntu6.15+esm4"],"ecosystem_specific":{"binaries":[{"binary_name":"eglibc-source","binary_version":"2.19-0ubuntu6.15+esm4"},{"binary_version":"2.19-0ubuntu6.15+esm4","binary_name":"libc-bin"},{"binary_name":"libc-dev-bin","binary_version":"2.19-0ubuntu6.15+esm4"},{"binary_version":"2.19-0ubuntu6.15+esm4","binary_name":"libc6"},{"binary_name":"libc6-amd64","binary_version":"2.19-0ubuntu6.15+esm4"},{"binary_version":"2.19-0ubuntu6.15+esm4","binary_name":"libc6-armel"},{"binary_name":"libc6-dev-amd64","binary_version":"2.19-0ubuntu6.15+esm4"},{"binary_version":"2.19-0ubuntu6.15+esm4","binary_name":"libc6-dev-armel"},{"binary_version":"2.19-0ubuntu6.15+esm4","binary_name":"libc6-dev-i386"},{"binary_name":"libc6-dev-x32","binary_version":"2.19-0ubuntu6.15+esm4"},{"binary_name":"libc6-i386","binary_version":"2.19-0ubuntu6.15+esm4"},{"binary_version":"2.19-0ubuntu6.15+esm4","binary_name":"libc6-pic"},{"binary_name":"libc6-prof","binary_version":"2.19-0ubuntu6.15+esm4"},{"binary_name":"libc6-x32","binary_version":"2.19-0ubuntu6.15+esm4"},{"binary_version":"2.19-0ubuntu6.15+esm4","binary_name":"multiarch-support"},{"binary_name":"nscd","binary_version":"2.19-0ubuntu6.15+esm4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-89092.json"}},{"package":{"name":"glibc","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/glibc?arch=source&distro=esm-infra%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.21-0ubuntu4","2.21-0ubuntu5","2.21-0ubuntu6","2.23-0ubuntu1","2.23-0ubuntu2","2.23-0ubuntu3","2.23-0ubuntu4","2.23-0ubuntu5","2.23-0ubuntu6","2.23-0ubuntu7","2.23-0ubuntu9","2.23-0ubuntu10","2.23-0ubuntu11","2.23-0ubuntu11.2","2.23-0ubuntu11.3","2.23-0ubuntu11.3+esm1","2.23-0ubuntu11.3+esm2","2.23-0ubuntu11.3+esm3","2.23-0ubuntu11.3+esm5","2.23-0ubuntu11.3+esm6","2.23-0ubuntu11.3+esm7","2.23-0ubuntu11.3+esm8","2.23-0ubuntu11.3+esm9"],"ecosystem_specific":{"binaries":[{"binary_name":"glibc-source","binary_version":"2.23-0ubuntu11.3+esm9"},{"binary_name":"libc-bin","binary_version":"2.23-0ubuntu11.3+esm9"},{"binary_name":"libc-dev-bin","binary_version":"2.23-0ubuntu11.3+esm9"},{"binary_name":"libc6","binary_version":"2.23-0ubuntu11.3+esm9"},{"binary_version":"2.23-0ubuntu11.3+esm9","binary_name":"libc6-amd64"},{"binary_name":"libc6-armel","binary_version":"2.23-0ubuntu11.3+esm9"},{"binary_name":"libc6-dev-amd64","binary_version":"2.23-0ubuntu11.3+esm9"},{"binary_version":"2.23-0ubuntu11.3+esm9","binary_name":"libc6-dev-armel"},{"binary_name":"libc6-dev-i386","binary_version":"2.23-0ubuntu11.3+esm9"},{"binary_version":"2.23-0ubuntu11.3+esm9","binary_name":"libc6-dev-s390"},{"binary_version":"2.23-0ubuntu11.3+esm9","binary_name":"libc6-dev-x32"},{"binary_name":"libc6-i386","binary_version":"2.23-0ubuntu11.3+esm9"},{"binary_version":"2.23-0ubuntu11.3+esm9","binary_name":"libc6-pic"},{"binary_name":"libc6-s390","binary_version":"2.23-0ubuntu11.3+esm9"},{"binary_version":"2.23-0ubuntu11.3+esm9","binary_name":"libc6-x32"},{"binary_version":"2.23-0ubuntu11.3+esm9","binary_name":"locales"},{"binary_name":"locales-all","binary_version":"2.23-0ubuntu11.3+esm9"},{"binary_version":"2.23-0ubuntu11.3+esm9","binary_name":"multiarch-support"},{"binary_name":"nscd","binary_version":"2.23-0ubuntu11.3+esm9"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-89092.json"}},{"package":{"name":"glibc","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/glibc?arch=source&distro=esm-infra%2Fbio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