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CVE-2026-9539

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).
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:a73361dccfb8257566e96a8b49ec6e4a16046b4630f5995eefe925fbf20503b2
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"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"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6e15fda4c23816e41eda546c39186e1f4700c660baecd413aa42c7bec8bbc5a7 · sha256:5f653771f1a1b277… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"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"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6e15fda4c23816e41eda546c39186e1f4700c660baecd413aa42c7bec8bbc5a7 · sha256:5f653771f1a1b277… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-125","description":"CWE-125 Out-of-bounds read","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:6e15fda4c23816e41eda546c39186e1f4700c660baecd413aa42c7bec8bbc5a7 · sha256:5f653771f1a1b277… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"tags":["patch"],"url":"https://gitlab.freedesktop.org/slirp/libslirp/-/commit/927bca7344e31fd58e2f7afaca784aad4400eb84"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6e15fda4c23816e41eda546c39186e1f4700c660baecd413aa42c7bec8bbc5a7 · sha256:5f653771f1a1b277… · /containers/cna/references/1
{"tags":["release-notes"],"url":"https://gitlab.freedesktop.org/slirp/libslirp/-/releases/v4.9.2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6e15fda4c23816e41eda546c39186e1f4700c660baecd413aa42c7bec8bbc5a7 · sha256:5f653771f1a1b277… · /containers/cna/references/2
{"tags":["exploit"],"url":"https://gitlab.freedesktop.org/slirp/libslirp/-/work_items/93"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6e15fda4c23816e41eda546c39186e1f4700c660baecd413aa42c7bec8bbc5a7 · sha256:5f653771f1a1b277… · /containers/adp/0/references/0
{"tags":["issue-tracking"],"url":"https://gitlab.freedesktop.org/slirp/libslirp/-/work_items/93"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6e15fda4c23816e41eda546c39186e1f4700c660baecd413aa42c7bec8bbc5a7 · sha256:5f653771f1a1b277… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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