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Vulnerability · Published Nov 3, 2026 · Assigned by redhat

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

Medium 6.5

In plain English

A medium-severity out-of-bounds write in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 81.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12libslirpno fix listedDEBIAN-CVE-2026-120831
Debian:13libslirpno fix listedDEBIAN-CVE-2026-120831
Debian:14libslirpno fix listedDEBIAN-CVE-2026-120831
Ubuntu:22.04:LTSlibslirpno fix listedUBUNTU-CVE-2026-120831
Ubuntu:24.04:LTSlibslirpno fix listedUBUNTU-CVE-2026-120831
Ubuntu:26.04:LTSlibslirpno fix listedUBUNTU-CVE-2026-120831
Ubuntu:26.10libslirpno fix listedUBUNTU-CVE-2026-120831

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 5 see references

Weakness: CWE-787 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References