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CVE-2026-97399

LOW 3.7

Published 2026-09-28 · Last modified 2026-09-28

The strncasecmp function in the GNU C Library 2.24 and later optimized for the Power8 architecture may read one byte beyond the input size limit, which may crash a program when that byte is not readable. This condition may happen when the input strings to the strncasecmp function are attacker controlled in an application and they match all the way up to the edge of their page and the neighbouring page is either not mapped or is not readable.

NO EXPLOITATION SIGNALS

No known exploitation, public exploit, or elevated probability at this time. Track for changes.

Exploitation likelihood

0.3%chance of exploitation in 30 days · 20th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

3.7CVSS 3.1 · LOW

  • ConfidentialityNone
  • IntegrityNone
  • AvailabilityLow

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓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.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors The Gnu C Library

Products Glibc

Weakness (CWE)

  • CWE-126: Buffer over-read

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

References and research data (JSON)

Vendor product assessments

Showing 32 of 677 vendor product statements; 645 omitted. Read the full vendor advisory.

  • glibc as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc

    • none available: Affected
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-bg as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-bg

    • none available: Affected
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-dsb as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-dsb

    • none available: Affected
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-gv as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-gv

    • none available: Affected
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-kk as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-kk

    • none available: Affected
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-mfe as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-mfe

    • none available: Affected
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-nr as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-nr

    • none available: Affected
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-sgs as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-sgs

    • none available: Affected
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-tg as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-tg

    • none available: Affected
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-wae as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-wae

    • none available: Affected
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-common as a component of Red Hat Enterprise Linux 6 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-common

    • no fix planned: Out of support scope
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-devel as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-devel

    • none available: Fix deferred
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-bi as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-bi

    • none available: Fix deferred
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-el as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-el

    • none available: Fix deferred
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-hi as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-hi

    • none available: Fix deferred
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-kok as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-kok

    • none available: Fix deferred
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-mk as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-mk

    • none available: Fix deferred
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-pa as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-pa

    • none available: Fix deferred
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-sm as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-sm

    • none available: Fix deferred
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-ts as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-ts

    • none available: Fix deferred
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-nss-devel as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-nss-devel

    • none available: Fix deferred
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-anp as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-anp

    • none available: Affected
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-cmn as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-cmn

    • none available: Affected
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-fr as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-fr

    • none available: Affected
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-ig as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-ig

    • none available: Affected
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-ln as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-ln

    • none available: Affected
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-nb as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-nb

    • none available: Affected
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-sa as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-sa

    • none available: Affected
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-ta as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-ta

    • none available: Affected
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc-langpack-vi as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/glibc-langpack-vi

    • none available: Affected
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • 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/ose-rhel-coreos-9?repository_url=registry.redhat.io/openshift/ose-rhel-coreos-9

    • none available: Fix deferred
    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00
  • glibc.src as a component of Red Hat Hardened Images · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/glibc?arch=src

    Red Hat · CVE-2026-97399 · Updated 2026-10-02T18:49:03+00:00

All CVSS metrics

  • LOW 3.7 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
  • LOW 3.7 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

References

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS