CVE-2026-120831ModerateAdjacentRevised 12 Nov

Libslirp: libslirp: queue pointer corruption in if_output() leading to denial of service

No KEV listing collectedCVSS 6.5Fix not stated

MSRC advisory NVD CVE.org

Assessment

Severity: Moderate
CVSS base score: 6.5
Impact: Not stated
Exploitation detected: Unknown: not stated by MSRC
Exploitability: Not assessed
Publicly disclosed: Unknown: not stated by MSRC
EPSS · 30-day forecast: No EPSS score collected
Customer action: Required: follow the MSRC remediation guidance

More details

CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U
Public detection template: No Nuclei template is listed in the current collected catalog
Component: Mariner
Weakness: CWE-787: Out-of-bounds Write
Issued by: redhat
Published: 5 Nov 2026 · November 2026
Last revised: 12 Nov 2026Information published.

CVSS 3.1 base metricsRed raises the risk · green lowers it

Attack vector: AdjacentAV:A
Attack complexity: LowAC:L
Privileges required: NonePR:N
User interaction: NoneUI:N
Scope: UnchangedS:U
Confidentiality: NoneC:N
Integrity: NoneI:N
Availability: HighA:H

Updates that fix it

0 KBs

No KB listed

No KB update is listed in the collected MSRC record. Check the MSRC advisory for product releases and other remedies.

Affected products

Open Source Software

1 affected product

azl3 libslirp 4.9.6-1 on Azure Linux 3.0

What changed

Detection template: Unknown: detection-template evidence is incomplete or retained → No Nuclei template listed
13 Nov 2026 · 12:10:20 UTC
Detection template: No Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
13 Nov 2026 · 11:07:20 UTC
Detection template: Unknown: detection-template evidence is incomplete or retained → No Nuclei template listed
6 Nov 2026 · 17:32:22 UTC
Detection template: No Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
6 Nov 2026 · 16:31:02 UTC

Page history

Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.

Cite this version

Field-level log (18)

Up to 100 recent field edits are shown; older edits may be outside retention.

13 Nov 2026 · 12:10:20 UTC Public detection templateUnknown: detection-template evidence is incomplete or retained → No Nuclei template listed
13 Nov 2026 · 12:10:20 UTC Source coverage: public-exploit-codeIncomplete → Current
13 Nov 2026 · 12:10:20 UTC Source coverage: first-epssIncomplete → Current
13 Nov 2026 · 12:10:20 UTC Source coverage: msrc-cvrfIncomplete → Current
13 Nov 2026 · 11:07:20 UTC Public detection templateNo Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
13 Nov 2026 · 11:07:20 UTC Source coverage: public-exploit-codeCurrent → Incomplete
13 Nov 2026 · 11:07:20 UTC Source coverage: first-epssCurrent → Incomplete
13 Nov 2026 · 11:07:20 UTC Source coverage: msrc-cvrfCurrent → Incomplete
12 Nov 2026 · 09:04:19 UTC Last revised10 Nov 2026 14:44 UTC → 12 Nov 2026 01:44 UTC
11 Nov 2026 · 08:57:52 UTC Last revised5 Nov 2026 01:04 UTC → 10 Nov 2026 14:44 UTC
6 Nov 2026 · 17:32:22 UTC Public detection templateUnknown: detection-template evidence is incomplete or retained → No Nuclei template listed
6 Nov 2026 · 17:32:22 UTC Source coverage: public-exploit-codeIncomplete → Current
6 Nov 2026 · 17:32:22 UTC Source coverage: first-epssIncomplete → Current
6 Nov 2026 · 17:32:22 UTC Source coverage: msrc-cvrfIncomplete → Current
6 Nov 2026 · 16:31:02 UTC Public detection templateNo Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
6 Nov 2026 · 16:31:02 UTC Source coverage: public-exploit-codeCurrent → Incomplete
6 Nov 2026 · 16:31:02 UTC Source coverage: first-epssCurrent → Incomplete
6 Nov 2026 · 16:31:02 UTC Source coverage: msrc-cvrfCurrent → Incomplete

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Exploitation and risk

Source status

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cve-program · CVE-2026-120831

Published

Libslirp: libslirp: queue pointer corruption in if_output() leading to denial of service

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.

Source published: 3 Nov 2026 01:55:20 UTC
Source modified: 5 Nov 2026 19:03:11 UTC
Saved here: 5 Nov 2026 20:36:27 UTC
Source terms: CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H