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TI-2026-60373 Aliases CVE-2026-89092GHSA-gwqp-9qgw-c5pv

Stack overflow in nscd due to unbounded alloca use

Priority LOW 19CWE-789Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Denial of service
Confidentiality · integrity · availability
None · Low · Low
Fix status
Partial Red Hat: 3 fixed, 6 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-789.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0024 15th percentileScored 2026-11-07
Fix Partial glibc (The GNU C Library): 2.45Red Hat: 1 advisoryRed Hat: 3 fixed, 6 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
GNUglibc2.3.4 to before 2.452.45Patch availableCNA
  • glibc VendorGNU Affected 2.3.4 to before 2.45 Fixed in 2.45 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*——GNU
  • cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:* Versions — — ·GNU

Remediation

  • Fix · CNA glibc (The GNU C Library) Fixed in 2.45

Red Hat 1 advisory

  • RHSA-2026:95618 Released 2026-11-05 · Red Hat rating Moderate
    glibc security update
    • Red Hat Enterprise Linux AppStream (v. 9) glibc-devel-2.34-284.el9_8.4, glibc-doc-2.34-284.el9_8.4, glibc-headers-2.34-284.el9_8.4 +2
    • Red Hat Enterprise Linux BaseOS (v. 9) glibc-2.34-284.el9_8.4, glibc-all-langpacks-2.34-284.el9_8.4, glibc-common-2.34-284.el9_8.4 +47
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) glibc-benchtests-2.34-284.el9_8.4, glibc-nss-devel-2.34-284.el9_8.4, glibc-static-2.34-284.el9_8.4 +2

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 7AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat OpenShift AI (RHOAI)Affected—
Red Hat OpenShift Container Platform 4AffectedNo fix yet: Fix deferred
Red Hat OpenShift Container Platform 5AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:95618
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:95618
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:95618
Not affected: 3 products
  • Red Hat Enterprise Linux 10
  • Red Hat Hardened Images
  • Red Hat OpenShift AI (RHOAI)

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-89092
  2. 2026-10-03 Alias added: GHSA-gwqp-9qgw-c5pv
  3. 2026-10-31 Affected versions changed · Red Hat
  4. 2026-11-06 Fix available: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · Red Hat
  5. 2026-11-06 Fix available: RHSA-2026:95618 · Red Hat
  6. 2026-11-06 Affected versions changed · Red Hat

References

Advisory 1

Other 1

  • TI-2026-19388 telnetd in GNU Inetutils through 2.7 allows remote authentication bypass via a "-f root"… KEVCVSS 3.1CRITICAL 9.8
  • TI-2014-05975 GNU Bash through 4.3 bash43-025 processes trailing strings after certain malformed… KEVCVSS 3.1CRITICAL 9.8
  • TI-2014-05157 GNU Bash through 4.3 processes trailing strings after function definitions in the values… KEVCVSS 3.1CRITICAL 9.8
  • TI-2014-05164 GNU Bash through 4.3 bash43-026 does not properly parse function definitions in the… KEVCVSS 3.1HIGH 8.8
  • TI-2023-04522 Glibc: buffer overflow in ld.so leading to privilege escalation KEVCVSS 3.1HIGH 7.8
  • TI-2009-03392 The TLS protocol, and the SSL protocol 3.0 and possibly earlier, as used in Microsoft… CVSS 3.1CRITICAL 9.8
See all 1272 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences