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TI-2026-00642 Aliases CVE-2026-0861GHSA-5pf6-63v3-88hw

Integer overflow in memalign leads to heap corruption

Priority LOW 39CWE-190Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 12 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-190 and the CVSS impact.

Summary

Passing too large an alignment to the memalign suite of functions (memalign, posix_memalign, aligned_alloc) in the GNU C Library version 2.30 to 2.42 may result in an integer overflow, which could consequently result in a heap corruption. Note that the attacker must have control over both, the size as well as the alignment arguments of the memalign function to be able to exploit this. The size parameter must be close enough to PTRDIFF_MAX so as to overflow size_t along with the large alignment argument. This limits the malicious inputs for the alignment for memalign to the range [1<<62+ 1, 1<<63] and exactly 1<<63 for posix_memalign and aligned_alloc. Typically the alignment argument passed to such functions is a known constrained quantity (e.g. page size, block size, struct sizes) and is not attacker controlled, because of which this may not be easily exploitable in practice. An application bug could potentially result in the input alignment being too large, e.g. due to a different buffer overflow or integer overflow in the application or its dependent libraries, but that is again an uncommon usage pattern given typical sources of alignments.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00386 32nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Red Hat: 12 advisoriesRed Hat: 12 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
GNUglibc2.30 – 2.42—No fix listedCNA
  • glibc VendorGNU Affected 2.30 – 2.42 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*2.30 – 2.42VulnerableGNU
  • cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:* Versions 2.30 – 2.42 Vulnerable ·GNU

Remediation

Red Hat 12 advisories

  • RHSA-2026:82857 Released 2026-10-14 · 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-bundle
  • 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
Show 9 more Red Hat advisories
  • 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
  • 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-2026:4655 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: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
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, RHSA-2026:82857
Cost Management 4Fixed RHSA-2026:3228
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 BaseOS (v. 10)Fixed RHSA-2026:1334
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:2786
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: 9 products
  • Cost Management 4
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • 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
  • Red Hat OpenShift Container Platform 4

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-0861
  2. 2026-10-03 Alias added: GHSA-5pf6-63v3-88hw
  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: RHSA-2026:82857 · Red Hat
  7. 2026-10-16 Fix available: Cert Manager support for Red Hat OpenShift release 1.18 · Red Hat

References

Exploit 1

Patch 2

  • 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