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TI-2026-00692 Aliases CVE-2026-0915GHSA-xp56-6525-9chf

getnetbyaddr and getnetbyaddr_r leak stack contents to DNS resovler

Priority HIGH 72CWE-908Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Partial Red Hat: 15 fixed, 3 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-908 and the CVSS impact.

Summary

Calling getnetbyaddr or getnetbyaddr_r with a configured nsswitch.conf that specifies the library's DNS backend for networks and queries for a zero-valued network in the GNU C Library version 2.0 to version 2.42 can leak stack contents to the configured DNS resolver.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00618 49th percentileScored 2026-11-07
Fix Partial Red Hat: 13 advisoriesRed Hat: 15 fixed, 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
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
GNUglibc2.0 – 2.42—No fix listedCNA
  • glibc VendorGNU Affected 2.0 – 2.42 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*2.0 – 2.42VulnerableGNU
  • cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:* Versions 2.0 – 2.42 Vulnerable ·GNU

Remediation

Red Hat 13 advisories

  • RHSA-2026:82372 Released 2026-10-13 · Red Hat rating Important
    cert-manager Operator for Red Hat OpenShift 1.18.2
    • Cert Manager support for Red Hat OpenShift release 1.18 registry.redhat.io/cert-manager/cert-manager-operator-rhel9
  • RHSA-2026:82354 Released 2026-10-13 · Red Hat rating Important
    cert-manager Operator for Red Hat OpenShift 1.18.2
    • Cert Manager support for Red Hat OpenShift release 1.18 registry.redhat.io/cert-manager/cert-manager-istio-csr-rhel9
  • RHSA-2026:82347 Released 2026-10-13 · Red Hat rating Important
    cert-manager Operator for Red Hat OpenShift 1.18.2
    • Cert Manager support for Red Hat OpenShift release 1.18 registry.redhat.io/cert-manager/jetstack-cert-manager-acmesolver-rhel9, registry.redhat.io/cert-manager/jetstack-cert-manager-rhel9
Show 10 more Red Hat advisories
  • RHSA-2026:39981 Released 2026-07-15 · Red Hat rating Important
    Cost Management Metrics Operator Update
    • Cost Management 4 registry.redhat.io/costmanagement/costmanagement-metrics-rhel9-operator
  • RHSA-2026:7316 Released 2026-04-09 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images glibc-2.42-11.1.hum1@aarch64, glibc-2.42-11.1.hum1@src, glibc-2.42-11.1.hum1@x86_64 +47
  • RHSA-2026:5606 Released 2026-03-24 · Red Hat rating Important
    Red Hat Ceph Storage
    • Red Hat Ceph Storage 8 registry.redhat.io/rhceph/rhceph-8-rhel9
  • RHSA-2026:4943 Released 2026-03-18 · Red Hat rating Important
    Red Hat Update Infrastructure 5.1 security update
    • Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-rhel9, registry.redhat.io/rhui5/haproxy-rhel9, registry.redhat.io/rhui5/installer-rhel9 +1
  • RHSA-2026:4772 Released 2026-03-17 · Red Hat rating Moderate
    glibc security update
    • Red Hat Enterprise Linux AppStream (v. 8) compat-libpthread-nonshared-2.28-251.el8_10.31, glibc-utils-2.28-251.el8_10.31
    • Red Hat Enterprise Linux BaseOS (v. 8) glibc-2.28-251.el8_10.31, glibc-all-langpacks-2.28-251.el8_10.31, glibc-common-2.28-251.el8_10.31 +47
    • Red Hat Enterprise Linux CRB (v. 8) glibc-benchtests-2.28-251.el8_10.31, glibc-nss-devel-2.28-251.el8_10.31, glibc-static-2.28-251.el8_10.31 +1
  • RHSA-2026:4655 Released 2026-03-16 · Red Hat rating Moderate
    Insights proxy Container Image
    • Red Hat Insights proxy 1.5 registry.redhat.io/insights-proxy/insights-proxy-container-rhel9
  • RHSA-2026:4501 Released 2026-03-12 · Red Hat rating Important
    A Subscription Management tool for finding and reporting Red Hat product usage
    • Red Hat Discovery 2 registry.redhat.io/discovery/discovery-server-rhel9, registry.redhat.io/discovery/discovery-ui-rhel9
  • RHSA-2026:3228 Released 2026-02-24 · Red Hat rating Important
    Cost Management Metrics Operator Update
    • Cost Management 4 registry.redhat.io/costmanagement/costmanagement-metrics-rhel9-operator
  • RHSA-2026:2786 Released 2026-02-17 · Red Hat rating Moderate
    glibc security update
    • Red Hat Enterprise Linux BaseOS (v. 9) glibc-2.34-231.el9_7.10
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) glibc-static-2.34-231.el9_7.10
  • RHSA-2026:1334 Released 2026-01-27 · Red Hat rating Moderate
    glibc security update
    • Red Hat Enterprise Linux AppStream (v. 10) glibc-devel-2.39-58.el10_1.7, glibc-doc-2.39-58.el10_1.7, glibc-locale-source-2.39-58.el10_1.7 +1
    • Red Hat Enterprise Linux BaseOS (v. 10) glibc-2.39-58.el10_1.7, glibc-all-langpacks-2.39-58.el10_1.7, glibc-common-2.39-58.el10_1.7 +47
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) glibc-benchtests-2.39-58.el10_1.7, glibc-nss-devel-2.39-58.el10_1.7, glibc-static-2.39-58.el10_1.7 +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 OpenShift Container Platform 4AffectedNo fix yet: Fix deferred
Cert Manager support for Red Hat OpenShift release 1.18Fixed RHSA-2026:82347, RHSA-2026:82354, RHSA-2026:82372
Cost Management 4Fixed RHSA-2026:3228, RHSA-2026:39981
Red Hat Ceph Storage 8Fixed RHSA-2026:5606
Red Hat Discovery 2Fixed RHSA-2026:4501
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:1334
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:4772
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:1334
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:4772
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:2786
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:4772
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:1334
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:2786
Red Hat Hardened ImagesFixed RHSA-2026:7316
Red Hat Insights proxy 1.5Fixed RHSA-2026:4655
Red Hat Update Infrastructure 5Fixed RHSA-2026:4943
Not affected: 5 products
  • Cost Management 4
  • 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 Hardened Images

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-0915
  2. 2026-10-03 Alias added: GHSA-xp56-6525-9chf
  3. 2026-10-14 Fix available: RHSA-2026:82372 · Red Hat
  4. 2026-10-14 Fix available: RHSA-2026:82354 · Red Hat
  5. 2026-10-14 Fix available: RHSA-2026:82347 · Red Hat
  6. 2026-10-15 Fix available: Cert Manager support for Red Hat OpenShift release 1.18 · Red Hat

References

Other 1

  • TI-2023-04522 Glibc: buffer overflow in ld.so leading to privilege escalation KEVCVSS 3.1HIGH 7.8
  • TI-2015-00205 Heap-based buffer overflow in the __nss_hostname_digits_dots function in glibc 2.2, and… CVSS 2.0HIGH 10.0
  • TI-2026-04772 scanf %mc off-by-one heap buffer overflow CVSS 3.1CRITICAL 9.8
  • TI-2022-07360 The deprecated compatibility function clnt_create in the sunrpc module of the GNU C… CVSS 3.1CRITICAL 9.8
  • TI-2022-07359 The deprecated compatibility function svcunix_create in the sunrpc module of the GNU C… CVSS 3.1CRITICAL 9.8
  • TI-2015-06274 Multiple stack-based buffer overflows in the (1) send_dg and (2) send_vc functions in the… CVSS 3.0HIGH 8.1
See all 162 →

Sources

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