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Fencer Vulns
high 7.5

CVE-2026-0915 json

getnetbyaddr and getnetbyaddr_r leak stack contents to DNS resovler

published 2026-01-15 9 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-2855

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

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.

Patch / fix

  • glibc Debian 12 2.36-9+deb12u14
  • glibc Debian 13 2.41-12+deb13u2
  • glibc Debian 14 2.42-8

debian advisories DEBIAN-CVE-2026-0915

  • glibc Ubuntu 22.04 LTS 2.35-0ubuntu3.13
  • glibc Ubuntu 24.04 LTS 2.39-0ubuntu8.7
  • glibc Ubuntu 25.10 2.42-0ubuntu3.1
  • glibc Ubuntu 26.04 LTS 2.42-2ubuntu5
  • glibc Ubuntu Pro 16.04 LTS 2.23-0ubuntu11.3+esm9
  • glibc Ubuntu Pro 18.04 LTS 2.27-3ubuntu1.6+esm6
  • glibc Ubuntu Pro 20.04 LTS 2.31-0ubuntu9.18+esm1

ubuntu advisories UBUNTU-CVE-2026-0915

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • glibc hummingbird 1 2.42-11.1.hum1
  • glibc32 hummingbird 1 2.42-11.1.hum1
  • glibc-utils hummingbird 1 2.42-11.1.hum1
  • glibc-common hummingbird 1 2.42-11.1.hum1
  • glibc-benchtests hummingbird 1 2.42-11.1.hum1
  • glibc-gconv-extra hummingbird 1 2.42-11.1.hum1
  • glibc-all-langpacks hummingbird 1 2.42-11.1.hum1
  • glibc-locale-source hummingbird 1 2.42-11.1.hum1

red hat advisories RHSA-2026:7316RHSA-2026:4772RHSA-2026:2786RHSA-2026:1334

  • glibc SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +9 more 2.31-150300.98.1
  • glibc Linux Micro 6.1 2.38-slfo.1.1_6.1
  • glibc Linux Micro 6.0 2.38-11.1
  • glibc SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Development Tools 15 SP7 +2 more 2.38-150600.14.40.1
  • glibc SLES 16.0, Linux Micro Extras 6.2, Linux Micro 6.2 +1 more 2.40-160000.3.1
  • glibc SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 2.22-114.43.1

suse advisories SUSE-SU-2026:0896-1SUSE-SU-2026:20536-1SUSE-SU-2026:0680-1SUSE-SU-2026:20527-1SUSE-SU-2026:0371-1SUSE-SU-2026:20178-1

  • glibc openSUSE Tumbleweed 2.43-1.1
  • glibc openSUSE Leap 16.0 2.40-160000.3.1
  • glibc-cross-s390x-src openSUSE Leap 16.0 2.40-160000.3.1
  • glibc-cross-aarch64-src openSUSE Leap 16.0 2.40-160000.3.1
  • glibc-cross-ppc64le-src openSUSE Leap 16.0 2.40-160000.3.1
  • glibc-cross-riscv64-src openSUSE Leap 16.0 2.40-160000.3.1

opensuse advisories openSUSE-SU-2026:10662-1openSUSE-SU-2026:20133-1

  • nscd AlmaLinux 8 2.28-251.el8_10.31
  • libnsl AlmaLinux 8 2.28-251.el8_10.31
  • nss_db AlmaLinux 8 2.28-251.el8_10.31
  • glibc-utils AlmaLinux 8 2.28-251.el8_10.31
  • glibc-locale-source AlmaLinux 8 2.28-251.el8_10.31
  • glibc-minimal-langpack AlmaLinux 8 2.28-251.el8_10.31
  • glibc AlmaLinux 9 2.34-231.el9_7.10
  • nscd AlmaLinux 9 2.34-231.el9_7.10

almalinux advisories ALSA-2026:4772ALSA-2026:2786

  • glibc Rocky Linux 8 2.28-251.el8_10.31
  • glibc Rocky Linux 9 2.34-231.el9_7.10
  • glibc Rocky Linux 10 2.39-58.el10_1.7

rocky linux advisories RLSA-2026:4772RLSA-2026:2786RLSA-2026:1334

  • glibc Azure Linux 3.0 2.38-18
  • glibc CBL-Mariner 2.0 2.35-9

azure linux advisories AZL-74633AZL-74817

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-0915 updated cvss 5.3

glibc: glibc: Information disclosure via zero-valued network query

  • Red Hat Enterprise Linux 6 nscd, glibc, glibc-utils, compat-glibc, glibc-common Red Hat Enterprise Linux 7 nscd, glibc, glibc-utils, compat-glibc, glibc-common Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.18 cert-manager/cert-manager-operator-rhel9 1789029076, cert-manager/jetstack-cert-manager-rhel9 1791459711, cert-manager/cert-manager-istio-csr-rhel9 1791459759, cert-manager/jetstack-cert-manager-acmesolver-rhel9 1791459707
    fixed: vendor fix RHSA-2026:82354
  • Red Hat Cost Management 4 costmanagement 1770836349, costmanagement/costmanagement-metrics-rhel9-operator 1783539156
    fixed: vendor fix RHSA-2026:39981
  • Red Hat Ceph Storage 8 rhceph 1774002867
    fixed: vendor fix RHSA-2026:5606
  • Red Hat Discovery 2 discovery 1773273070, discovery 1773273243
    fixed: vendor fix RHSA-2026:4501
  • Red Hat Enterprise Linux AppStream (v. 8) glibc-utils 2.28-251.el8_10.31, compat-libpthread-nonshared 2.28-251.el8_10.31
    fixed: vendor fix RHSA-2026:4772
  • Red Hat Enterprise Linux AppStream (v. 10) glibc-utils 2.39-58.el10_1.7, glibc-locale-source 2.39-58.el10_1.7
    fixed: vendor fix RHSA-2026:1334
  • Red Hat Enterprise Linux BaseOS (v. 8) nscd 2.28-251.el8_10.31, glibc 2.28-251.el8_10.31, libnsl 2.28-251.el8_10.31, nss_db 2.28-251.el8_10.31, glibc-common 2.28-251.el8_10.31, glibc-gconv-extra 2.28-251.el8_10.31, +3 more
    fixed: vendor fix RHSA-2026:4772
show 9 more
  • Red Hat Enterprise Linux BaseOS (v. 9) glibc 2.34-231.el9_7.10
    fixed: vendor fix RHSA-2026:2786
  • Red Hat Enterprise Linux BaseOS (v. 10) glibc 2.39-58.el10_1.7, libnsl 2.39-58.el10_1.7, glibc-common 2.39-58.el10_1.7, glibc-gconv-extra 2.39-58.el10_1.7, glibc-all-langpacks 2.39-58.el10_1.7, glibc-minimal-langpack 2.39-58.el10_1.7
    fixed: vendor fix RHSA-2026:1334
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) glibc-static 2.34-231.el9_7.10
    fixed: vendor fix RHSA-2026:2786
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) nss_db 2.39-58.el10_1.7, nss_hesiod 2.39-58.el10_1.7, glibc-benchtests 2.39-58.el10_1.7
    fixed: vendor fix RHSA-2026:1334
  • Red Hat Enterprise Linux CRB (v. 8) nss_hesiod 2.28-251.el8_10.31, glibc-benchtests 2.28-251.el8_10.31
    fixed: vendor fix RHSA-2026:4772
  • Red Hat Hardened Images glibc 2.42-11.1.hum1, glibc32 2.42-11.1.hum1, glibc-utils 2.42-11.1.hum1, glibc-common 2.42-11.1.hum1, glibc-benchtests 2.42-11.1.hum1, glibc-gconv-extra 2.42-11.1.hum1, +5 more
    fixed: vendor fix RHSA-2026:7316
  • Red Hat Insights proxy 1.5 insights-proxy 1773685509
    fixed: vendor fix RHSA-2026:4655
  • Red Hat Update Infrastructure 5 rhui5 1773668803, rhui5 1773670073, rhui5 1773670137, rhui5 1773672059
    fixed: vendor fix RHSA-2026:4943
  • Red Hat Cost Management 4 costmanagement 1770837277, costmanagement/costmanagement-metrics-operator-bundle 1783613222 Red Hat Enterprise Linux AppStream (v. 9) glibc-utils 2.34-231.el9_7.10, glibc-locale-source 2.34-231.el9_7.10 Red Hat Enterprise Linux BaseOS (v. 9) nscd 2.34-231.el9_7.10, libnsl 2.34-231.el9_7.10, glibc-common 2.34-231.el9_7.10, glibc-gconv-extra 2.34-231.el9_7.10, glibc-all-langpacks 2.34-231.el9_7.10, glibc-minimal-langpack 2.34-231.el9_7.10 Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) nss_db 2.34-231.el9_7.10, nss_hesiod 2.34-231.el9_7.10, glibc-benchtests 2.34-231.el9_7.10 Red Hat Hardened Images libnsl 2.42-11.1.hum1, nss_db 2.42-11.1.hum1, nss_hesiod 2.42-11.1.hum1, compat-libpthread-nonshared 2.42-11.1.hum1
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
9 mo ago

Exploit prediction

0.62% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • sourceware.org https://sourceware.org/bugzilla/show_bug.cgi?id=33802 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

  • The GNU C Library glibc

Classification

Weakness
  • CWE-908 Use of Uninitialized Resource

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.