CVE-2026-89092
MEDIUM 4.2The 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.
No known exploitation, public exploit, or elevated probability at this time. Track for changes.
Exploitation likelihood
0.2%chance of exploitation in 30 days · 15th percentile
Impact if exploited
4.2CVSS 3.1 · MEDIUM
- ConfidentialityNone
- IntegrityLow
- AvailabilityLow
What an attacker needs
- ⚠Access: Must sit on the same / adjacent network
- ✓Privileges: No account or privileges required
- ✓User interaction: No user interaction needed
- ⚠Complexity: Needs a race window or specific setup
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
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Data snapshot:
Weakness (CWE)
- CWE-789: Memory allocation with excessive size value
CVSS vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
References and research data (JSON)
Vendor product assessments
Showing 32 of 677 vendor product statements; 645 omitted. Read the full vendor advisory.
compat-glibc-headers as a component of Red Hat Enterprise Linux 6 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/compat-glibc-headers
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
- none available: Fix deferred
glibc-langpack-aa as a component of Red Hat Enterprise Linux 8 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/glibc-langpack-aa
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
- none available: Fix deferred
glibc-langpack-cs as a component of Red Hat Enterprise Linux 8 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/glibc-langpack-cs
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
- none available: Fix deferred
glibc-langpack-hak as a component of Red Hat Enterprise Linux 8 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/glibc-langpack-hak
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
- none available: Fix deferred
glibc-langpack-lb as a component of Red Hat Enterprise Linux 8 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/glibc-langpack-lb
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
- none available: Fix deferred
glibc-langpack-niu as a component of Red Hat Enterprise Linux 8 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/glibc-langpack-niu
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
- none available: Fix deferred
glibc-langpack-sk as a component of Red Hat Enterprise Linux 8 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/glibc-langpack-sk
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
- none available: Fix deferred
glibc-langpack-ur as a component of Red Hat Enterprise Linux 8 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/glibc-langpack-ur
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
- none available: Fix deferred
glibc-gconv-extra as a component of Red Hat Enterprise Linux 9 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/glibc-gconv-extra
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
- none available: Affected
glibc-langpack-ckb as a component of Red Hat Enterprise Linux 9 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/glibc-langpack-ckb
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
- none available: Affected
glibc-langpack-gl as a component of Red Hat Enterprise Linux 9 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/glibc-langpack-gl
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
- none available: Affected
glibc-langpack-ks as a component of Red Hat Enterprise Linux 9 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/glibc-langpack-ks
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
- none available: Affected
glibc-langpack-nan as a component of Red Hat Enterprise Linux 9 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/glibc-langpack-nan
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
- none available: Affected
glibc-langpack-shn as a component of Red Hat Enterprise Linux 9 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/glibc-langpack-shn
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
- none available: Affected
glibc-langpack-tt as a component of Red Hat Enterprise Linux 9 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/glibc-langpack-tt
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
- none available: Affected
openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4 · known affected
Vendor assessment for this product only.
pkg:oci/[email protected]?repository_url=registry.redhat.io/openshift/ose-rhel-coreos-9
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
- none available: Fix deferred
glibc as a component of Red Hat Enterprise Linux 10 · known not affected
Vendor assessment for this product only.
Reason: component not present
pkg:rpm/redhat/glibc
Red Hat · CVE-2026-89092 · Updated 2026-10-16T12:18:57+00:00glibc-langpack-as as a component of Red Hat Enterprise Linux 10 · known not affected
Vendor assessment for this product only.
Reason: component not present
pkg:rpm/redhat/glibc-langpack-as
Red Hat · CVE-2026-89092 · Updated 2026-10-16T12:18:57+00:00glibc-langpack-bs as a component of Red Hat Enterprise Linux 10 · known not affected
Vendor assessment for this product only.
Reason: component not present
pkg:rpm/redhat/glibc-langpack-bs
Red Hat · CVE-2026-89092 · Updated 2026-10-16T12:18:57+00:00glibc-langpack-doi as a component of Red Hat Enterprise Linux 10 · known not affected
Vendor assessment for this product only.
Reason: component not present
pkg:rpm/redhat/glibc-langpack-doi
Red Hat · CVE-2026-89092 · Updated 2026-10-16T12:18:57+00:00glibc-langpack-fr as a component of Red Hat Enterprise Linux 10 · known not affected
Vendor assessment for this product only.
Reason: component not present
pkg:rpm/redhat/glibc-langpack-fr
Red Hat · CVE-2026-89092 · Updated 2026-10-16T12:18:57+00:00glibc-langpack-hne as a component of Red Hat Enterprise Linux 10 · known not affected
Vendor assessment for this product only.
Reason: component not present
pkg:rpm/redhat/glibc-langpack-hne
Red Hat · CVE-2026-89092 · Updated 2026-10-16T12:18:57+00:00glibc-langpack-kab as a component of Red Hat Enterprise Linux 10 · known not affected
Vendor assessment for this product only.
Reason: component not present
pkg:rpm/redhat/glibc-langpack-kab
Red Hat · CVE-2026-89092 · Updated 2026-10-16T12:18:57+00:00glibc-langpack-lij as a component of Red Hat Enterprise Linux 10 · known not affected
Vendor assessment for this product only.
Reason: component not present
pkg:rpm/redhat/glibc-langpack-lij
Red Hat · CVE-2026-89092 · Updated 2026-10-16T12:18:57+00:00glibc-langpack-mk as a component of Red Hat Enterprise Linux 10 · known not affected
Vendor assessment for this product only.
Reason: component not present
pkg:rpm/redhat/glibc-langpack-mk
Red Hat · CVE-2026-89092 · Updated 2026-10-16T12:18:57+00:00glibc-langpack-nl as a component of Red Hat Enterprise Linux 10 · known not affected
Vendor assessment for this product only.
Reason: component not present
pkg:rpm/redhat/glibc-langpack-nl
Red Hat · CVE-2026-89092 · Updated 2026-10-16T12:18:57+00:00glibc-langpack-rif as a component of Red Hat Enterprise Linux 10 · known not affected
Vendor assessment for this product only.
Reason: component not present
pkg:rpm/redhat/glibc-langpack-rif
Red Hat · CVE-2026-89092 · Updated 2026-10-16T12:18:57+00:00glibc-langpack-sk as a component of Red Hat Enterprise Linux 10 · known not affected
Vendor assessment for this product only.
Reason: component not present
pkg:rpm/redhat/glibc-langpack-sk
Red Hat · CVE-2026-89092 · Updated 2026-10-16T12:18:57+00:00glibc-langpack-tcy as a component of Red Hat Enterprise Linux 10 · known not affected
Vendor assessment for this product only.
Reason: component not present
pkg:rpm/redhat/glibc-langpack-tcy
Red Hat · CVE-2026-89092 · Updated 2026-10-16T12:18:57+00:00glibc-langpack-ts as a component of Red Hat Enterprise Linux 10 · known not affected
Vendor assessment for this product only.
Reason: component not present
pkg:rpm/redhat/glibc-langpack-ts
Red Hat · CVE-2026-89092 · Updated 2026-10-16T12:18:57+00:00glibc-langpack-yo as a component of Red Hat Enterprise Linux 10 · known not affected
Vendor assessment for this product only.
Reason: component not present
pkg:rpm/redhat/glibc-langpack-yo
Red Hat · CVE-2026-89092 · Updated 2026-10-16T12:18:57+00:00glibc.src as a component of Red Hat Hardened Images · known not affected
Vendor assessment for this product only.
Reason: component not present
pkg:rpm/redhat/glibc?arch=src
Red Hat · CVE-2026-89092 · Updated 2026-10-16T12:18:57+00:00
All CVSS metrics
- MEDIUM 4.2 v3.1 · CNA Primary
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L - MEDIUM 4.2 v3.1 · NVD Secondary
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
References
Advisories
- https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0016 CVE record · glibc · Updated 2026-09-11T01:23:01.162Z
NVD · CVE-2026-89092 · Updated 2026-09-11T18:17:00.230
Red Hat · CVE-2026-89092 · Updated 2026-10-16T12:18:57+00:00 - https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89092.json Red Hat · CVE-2026-89092 · Updated 2026-10-16T12:18:57+00:00
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-75897 EUVD · EUVD-2026-75897
Technical & other
- https://sourceware.org/bugzilla/show_bug.cgi?id=34624 CVE record · glibc · Updated 2026-09-11T01:23:01.162Z
NVD · CVE-2026-89092 · Updated 2026-09-11T18:17:00.230
Red Hat · CVE-2026-89092 · Updated 2026-10-16T12:18:57+00:00 - http://www.openwall.com/lists/oss-security/2026/09/11/2CVE record · CVE · Updated 2026-09-11T03:09:09.108Z
NVD · CVE-2026-89092 · Updated 2026-09-11T18:17:00.230 - https://access.redhat.com/security/cve/CVE-2026-89092 Red Hat · CVE-2026-89092 · Updated 2026-10-16T12:18:57+00:00
- https://bugzilla.redhat.com/show_bug.cgi?id=2531725 Red Hat · CVE-2026-89092 · Updated 2026-10-16T12:18:57+00:00
- https://www.cve.org/CVERecord?id=CVE-2026-89092 Red Hat · CVE-2026-89092 · Updated 2026-10-16T12:18:57+00:00
- https://nvd.nist.gov/vuln/detail/CVE-2026-89092 Red Hat · CVE-2026-89092 · Updated 2026-10-16T12:18:57+00:00