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).

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2026:2931-1 advisory.

    - CVE-2026-9539: TCP URG out of bounds heap read information leak (bsc#1268903).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote openSUSE 16 host has packages installed that are affected by a vulnerability as referenced in the openSUSE- SU-2026:21216-1 advisory.

    This update for libslirp fixes the following issue

    - CVE-2026-9539: TCP URG out of bounds heap read information leak (bsc#1268903).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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). (CVE-2026-9539)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
326934	SUSE SLED15 / SLES15 Security Update : libslirp (SUSE-SU-2026:2931-1)	Nessus	SuSE Local Security Checks	medium
325023	openSUSE 16 Security Update : libslirp (openSUSE-SU-2026:21216-1)	Nessus	SuSE Local Security Checks	medium
322444	Linux Distros Unpatched Vulnerability : CVE-2026-9539	Nessus	Misc.	medium

Detections

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CVE-2026-9539

medium

Tenable Plugins

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medium

medium