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  4. CVE 2026 120831 libslirp libslirp queue pointer corruption in
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Back to active CVEs
Medium · CVSS 6.5CVE-2026-120831

Libslirp: libslirp: queue pointer corruption in if_output() leading to denial of serviceCVE-2026-120831

Answer in brief

CVE-2026-120831 records a Medium severity (CVSS 6.5) vulnerability in Libslirp: libslirp: queue pointer corruption in if_output() leading to denial of service. The current sources do not mark it as known exploited. The current feed maps Red Hat/container-tools:rhel8/libslirp (generic), Red Hat/libslirp (generic), Red Hat/openshift/ose-rhel-coreos-8 (generic), Red Hat/openshift/ose-rhel-coreos-9 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 3, 2026Updated Nov 3, 2026Source checked Nov 3, 2026First seen by HOL Nov 3, 2026Material review Nov 3, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.5
Exploitation
Not marked as known exploited
Affected software
4 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 6.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/container-tools:rhel8/libslirp (generic), Red Hat/libslirp (generic), Red Hat/openshift/ose-rhel-coreos-8 (generic), Red Hat/openshift/ose-rhel-coreos-9 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/container-tools:rhel8/libslirpgeneric*Not reported
Red Hat/libslirpgeneric*Not reported
Red Hat/openshift/ose-rhel-coreos-8generic*Not reported
Red Hat/openshift/ose-rhel-coreos-9generic*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/container-tools:rhel8/libslirp, Red Hat/libslirp, Red Hat/openshift/ose-rhel-coreos-8.
  2. 2Review the reported fix. Source-reported workaround: Red Hat is not aware of a practical temporary workaround that fully mitigates this issue or meets Red Hat Product Security's standards for usability, deployment, applicability, or stability. Customers are advised to apply the relevant security updates when/if they become available.

Evidence timeline and material changes

  1. Published upstream

    Nov 3, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 3, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 3, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
  • Source referencegitlab.freedesktop.org
Upstream source description

A flaw was found in libslirp in if_output(). When moving a session from the fast queue to the batch queue, the code unlinked and reinserted an arbitrary packet via ifm->m_nextpkt instead of the session queue head, corrupting queue pointers. A guest generating burst traffic could crash the host networking process, causing a denial of service.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Libslirp: libslirp: out-of-bounds heap read in icmp_forward_error() leading to information disclosureSame red hat/container-tools package
  • Amlogic DroidLogic SubTitleService Out-of-Bounds Write via VobSub SET_CONTRAlso CWE-787
  • psqlODBC row cache overflow when a later FETCH changes the column countAlso CWE-787
  • psqlODBC stack buffer overflow when quoting long schema and table namesAlso CWE-787
  • psqlODBC stack buffer overflow copying ctid and oid values for updatable cursorsAlso CWE-787

Record context

Vulnerability class
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-787
Source
CVE List V5
Source checked
Nov 3, 2026
References
3 linked sources
Open source record