Vulnerability-Lookup

SUSE-SU-2026:22452-1

Vulnerability from csaf_suse - Published: 2026-06-30 09:18 - Updated: 2026-06-30 09:18

Summary

Security update for libslirp

Severity

Moderate

Notes

Title of the patch: Security update for libslirp

Description of the patch: This update for libslirp fixes the following issue - CVE-2026-9539: TCP URG out of bounds heap read information leak (bsc#1268903).

Patchnames: SUSE-SLE-Micro-6.1-600

CVE-2026-9539

6.5 (Medium)


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

Affected products

Recommended 4 products

Product	Version	Remediation
Unresolved product id: SUSE Linux Micro 6.1:libslirp0-4.8.0+2-slfo.1.1_2.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:libslirp0-4.8.0+2-slfo.1.1_2.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:libslirp0-4.8.0+2-slfo.1.1_2.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:libslirp0-4.8.0+2-slfo.1.1_2.1.x86_64	—	Vendor Fix

Threats

Impact moderate

References

8 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/s…	self
https://www.suse.com/support/update/announcement/…	self
https://lists.suse.com/pipermail/sle-security-upd…	self
https://bugzilla.suse.com/1268903	self
https://www.suse.com/security/cve/CVE-2026-9539/	self
https://www.suse.com/security/cve/CVE-2026-9539	external
https://bugzilla.suse.com/1268903	external

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "namespace": "https://www.suse.com/support/security/rating/",
      "text": "moderate"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Copyright 2024 SUSE LLC. All rights reserved.",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "summary",
        "text": "Security update for libslirp",
        "title": "Title of the patch"
      },
      {
        "category": "description",
        "text": "This update for libslirp fixes the following issue\n\n- CVE-2026-9539: TCP URG out of bounds heap read information leak (bsc#1268903).\n",
        "title": "Description of the patch"
      },
      {
        "category": "details",
        "text": "SUSE-SLE-Micro-6.1-600",
        "title": "Patchnames"
      },
      {
        "category": "legal_disclaimer",
        "text": "CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).",
        "title": "Terms of use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://www.suse.com/support/security/contact/",
      "name": "SUSE Product Security Team",
      "namespace": "https://www.suse.com/"
    },
    "references": [
      {
        "category": "external",
        "summary": "SUSE ratings",
        "url": "https://www.suse.com/support/security/rating/"
      },
      {
        "category": "self",
        "summary": "URL of this CSAF notice",
        "url": "https://ftp.suse.com/pub/projects/security/csaf/suse-su-2026_22452-1.json"
      },
      {
        "category": "self",
        "summary": "URL for SUSE-SU-2026:22452-1",
        "url": "https://www.suse.com/support/update/announcement/2026/suse-su-202622452-1/"
      },
      {
        "category": "self",
        "summary": "E-Mail link for SUSE-SU-2026:22452-1",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2026-July/027256.html"
      },
      {
        "category": "self",
        "summary": "SUSE Bug 1268903",
        "url": "https://bugzilla.suse.com/1268903"
      },
      {
        "category": "self",
        "summary": "SUSE CVE CVE-2026-9539 page",
        "url": "https://www.suse.com/security/cve/CVE-2026-9539/"
      }
    ],
    "title": "Security update for libslirp",
    "tracking": {
      "current_release_date": "2026-06-30T09:18:34Z",
      "generator": {
        "date": "2026-06-30T09:18:34Z",
        "engine": {
          "name": "cve-database.git:bin/generate-csaf.pl",
          "version": "1"
        }
      },
      "id": "SUSE-SU-2026:22452-1",
      "initial_release_date": "2026-06-30T09:18:34Z",
      "revision_history": [
        {
          "date": "2026-06-30T09:18:34Z",
          "number": "1",
          "summary": "Current version"
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "libslirp0-4.8.0+2-slfo.1.1_2.1.aarch64",
                "product": {
                  "name": "libslirp0-4.8.0+2-slfo.1.1_2.1.aarch64",
                  "product_id": "libslirp0-4.8.0+2-slfo.1.1_2.1.aarch64"
                }
              }
            ],
            "category": "architecture",
            "name": "aarch64"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "libslirp0-4.8.0+2-slfo.1.1_2.1.ppc64le",
                "product": {
                  "name": "libslirp0-4.8.0+2-slfo.1.1_2.1.ppc64le",
                  "product_id": "libslirp0-4.8.0+2-slfo.1.1_2.1.ppc64le"
                }
              }
            ],
            "category": "architecture",
            "name": "ppc64le"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "libslirp0-4.8.0+2-slfo.1.1_2.1.s390x",
                "product": {
                  "name": "libslirp0-4.8.0+2-slfo.1.1_2.1.s390x",
                  "product_id": "libslirp0-4.8.0+2-slfo.1.1_2.1.s390x"
                }
              }
            ],
            "category": "architecture",
            "name": "s390x"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "libslirp0-4.8.0+2-slfo.1.1_2.1.x86_64",
                "product": {
                  "name": "libslirp0-4.8.0+2-slfo.1.1_2.1.x86_64",
                  "product_id": "libslirp0-4.8.0+2-slfo.1.1_2.1.x86_64"
                }
              }
            ],
            "category": "architecture",
            "name": "x86_64"
          },
          {
            "branches": [
              {
                "category": "product_name",
                "name": "SUSE Linux Micro 6.1",
                "product": {
                  "name": "SUSE Linux Micro 6.1",
                  "product_id": "SUSE Linux Micro 6.1",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:suse:sl-micro:6.1"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "SUSE Linux Enterprise"
          }
        ],
        "category": "vendor",
        "name": "SUSE"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "libslirp0-4.8.0+2-slfo.1.1_2.1.aarch64 as component of SUSE Linux Micro 6.1",
          "product_id": "SUSE Linux Micro 6.1:libslirp0-4.8.0+2-slfo.1.1_2.1.aarch64"
        },
        "product_reference": "libslirp0-4.8.0+2-slfo.1.1_2.1.aarch64",
        "relates_to_product_reference": "SUSE Linux Micro 6.1"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "libslirp0-4.8.0+2-slfo.1.1_2.1.ppc64le as component of SUSE Linux Micro 6.1",
          "product_id": "SUSE Linux Micro 6.1:libslirp0-4.8.0+2-slfo.1.1_2.1.ppc64le"
        },
        "product_reference": "libslirp0-4.8.0+2-slfo.1.1_2.1.ppc64le",
        "relates_to_product_reference": "SUSE Linux Micro 6.1"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "libslirp0-4.8.0+2-slfo.1.1_2.1.s390x as component of SUSE Linux Micro 6.1",
          "product_id": "SUSE Linux Micro 6.1:libslirp0-4.8.0+2-slfo.1.1_2.1.s390x"
        },
        "product_reference": "libslirp0-4.8.0+2-slfo.1.1_2.1.s390x",
        "relates_to_product_reference": "SUSE Linux Micro 6.1"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "libslirp0-4.8.0+2-slfo.1.1_2.1.x86_64 as component of SUSE Linux Micro 6.1",
          "product_id": "SUSE Linux Micro 6.1:libslirp0-4.8.0+2-slfo.1.1_2.1.x86_64"
        },
        "product_reference": "libslirp0-4.8.0+2-slfo.1.1_2.1.x86_64",
        "relates_to_product_reference": "SUSE Linux Micro 6.1"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-9539",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-9539"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "An out-of-bounds heap read and integer underflow in the TCP urgent data handling (sosendoob) in freedesktop.org libslirp version before v4.9.2 on hypervisor host environments (e.g., QEMU) allows a privileged guest VM attacker (root or CAP_NET_RAW) to leak gigabytes of sensitive host-process heap memory via sending crafted TCP segments with manipulated URG flags and urgent pointers (ti_urp).",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "SUSE Linux Micro 6.1:libslirp0-4.8.0+2-slfo.1.1_2.1.aarch64",
          "SUSE Linux Micro 6.1:libslirp0-4.8.0+2-slfo.1.1_2.1.ppc64le",
          "SUSE Linux Micro 6.1:libslirp0-4.8.0+2-slfo.1.1_2.1.s390x",
          "SUSE Linux Micro 6.1:libslirp0-4.8.0+2-slfo.1.1_2.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-9539",
          "url": "https://www.suse.com/security/cve/CVE-2026-9539"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1268903 for CVE-2026-9539",
          "url": "https://bugzilla.suse.com/1268903"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "SUSE Linux Micro 6.1:libslirp0-4.8.0+2-slfo.1.1_2.1.aarch64",
            "SUSE Linux Micro 6.1:libslirp0-4.8.0+2-slfo.1.1_2.1.ppc64le",
            "SUSE Linux Micro 6.1:libslirp0-4.8.0+2-slfo.1.1_2.1.s390x",
            "SUSE Linux Micro 6.1:libslirp0-4.8.0+2-slfo.1.1_2.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "SUSE Linux Micro 6.1:libslirp0-4.8.0+2-slfo.1.1_2.1.aarch64",
            "SUSE Linux Micro 6.1:libslirp0-4.8.0+2-slfo.1.1_2.1.ppc64le",
            "SUSE Linux Micro 6.1:libslirp0-4.8.0+2-slfo.1.1_2.1.s390x",
            "SUSE Linux Micro 6.1:libslirp0-4.8.0+2-slfo.1.1_2.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-06-30T09:18:34Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2026-9539"
    }
  ]
}

CVE-2026-9539 (GCVE-0-2026-9539)

Vulnerability from cvelistv5 – Published: 2026-06-24 04:37 – Updated: 2026-06-24 12:39

Title

libslirp TCP URG OOB Read Information Leak

Summary

An out-of-bounds heap read and integer underflow in the TCP urgent data handling (sosendoob) in freedesktop.org libslirp version before v4.9.2 on hypervisor host environments (e.g., QEMU) allows a privileged guest VM attacker (root or CAP_NET_RAW) to leak gigabytes of sensitive host-process heap memory via sending crafted TCP segments with manipulated URG flags and urgent pointers (ti_urp).

Severity

6.5 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-24 12:39 UTC

CWE

CWE-125 - Out-of-bounds read

Assigner

STAR_Labs mitre root

References

3 references

URL	Tags
https://gitlab.freedesktop.org/slirp/libslirp/-/w…	issue-tracking
https://gitlab.freedesktop.org/slirp/libslirp/-/c…	patch
https://gitlab.freedesktop.org/slirp/libslirp/-/r…	release-notes

Impacted products

1 product

Vendor	Product	Version
freedesktop.org	libslirp	Affected: 0 , < 4.9.2 (semver)

Date Public

2026-06-24 04:25

Credits

Bruce Chen of STAR Labs SG Pte. Ltd. Shi Weiming of STAR Labs SG Pte. Ltd.

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-9539",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-24T12:39:41.276722Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-24T12:39:59.831Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://gitlab.freedesktop.org/slirp/libslirp/-/work_items/93"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "libslirp",
          "repo": "https://gitlab.freedesktop.org/slirp/libslirp/",
          "vendor": "freedesktop.org",
          "versions": [
            {
              "changes": [
                {
                  "at": "4.9.2",
                  "status": "unaffected"
                }
              ],
              "lessThan": "4.9.2",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Bruce Chen of STAR Labs SG Pte. Ltd."
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "Shi Weiming of STAR Labs SG Pte. Ltd."
        }
      ],
      "datePublic": "2026-06-24T04:25:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "An out-of-bounds heap read and integer underflow in the TCP urgent data handling (sosendoob) in freedesktop.org libslirp version before v4.9.2 on hypervisor host environments (e.g., QEMU) allows a privileged guest VM attacker (root or CAP_NET_RAW) to leak gigabytes of sensitive host-process heap memory via sending crafted TCP segments with manipulated URG flags and urgent pointers (ti_urp)."
            }
          ],
          "value": "An out-of-bounds heap read and integer underflow in the TCP urgent data handling (sosendoob) in freedesktop.org libslirp version before v4.9.2 on hypervisor host environments (e.g., QEMU) allows a privileged guest VM attacker (root or CAP_NET_RAW) to leak gigabytes of sensitive host-process heap memory via sending crafted TCP segments with manipulated URG flags and urgent pointers (ti_urp)."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-131",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-131 Resource Leak Exposure"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125 Out-of-bounds read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-24T04:37:01.955Z",
        "orgId": "b1571b85-cbc9-431f-830b-0c8155323a69",
        "shortName": "STAR_Labs"
      },
      "references": [
        {
          "tags": [
            "issue-tracking"
          ],
          "url": "https://gitlab.freedesktop.org/slirp/libslirp/-/work_items/93"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://gitlab.freedesktop.org/slirp/libslirp/-/commit/927bca7344e31fd58e2f7afaca784aad4400eb84"
        },
        {
          "tags": [
            "release-notes"
          ],
          "url": "https://gitlab.freedesktop.org/slirp/libslirp/-/releases/v4.9.2"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "libslirp TCP URG OOB Read Information Leak",
      "x_generator": {
        "engine": "Vulnogram 1.0.2"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "b1571b85-cbc9-431f-830b-0c8155323a69",
    "assignerShortName": "STAR_Labs",
    "cveId": "CVE-2026-9539",
    "datePublished": "2026-06-24T04:37:01.955Z",
    "dateReserved": "2026-05-26T02:36:53.227Z",
    "dateUpdated": "2026-06-24T12:39:59.831Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

SUSE-SU-2026:22452-1

CVE-2026-9539 (GCVE-0-2026-9539)

Tags

Sightings

Nomenclature

Related by attack behaviour