CVE-2026-90054

A flaw was found in the Linux kernel's Transmission Control Protocol TCP urgent data handling. When TCP retransmits multi-segment packets while in urgent mode, the urgent pointer urgptr is incorrectly copied across segments. This error causes the receiver to misinterpret the urgent data's positio...

Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS : libslirp vulnerability (USN-8550-1)

The remote Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-8550-1 advisory. It was discovered that libslirp incorrectly handled TCP urgent data. A privileged attacker inside a guest VM could possibly use this issue...

USN-8550-1: libslirp vulnerability

It was discovered that libslirp incorrectly handled TCP urgent data. A privileged attacker inside a guest VM could possibly use this issue to obtain sensitive information from the host process memory...

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 CAPNETRAW to leak gigabytes of sensitive host-process heap memory v...

UBUNTU-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 CAPNETRAW to leak gigabytes of sensitive host-process heap memory v...

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 CAPNETRAW to leak gigabytes of sensitive host-process heap memory v...

CVE-2026-9539 libslirp TCP URG OOB Read Information Leak

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 CAPNETRAW to leak gigabytes of sensitive host-process heap memory v...

EUVD-2026-38654

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 CAPNETRAW to leak gigabytes of sensitive host-process heap memory v...

CVE-2026-9539

CVE-2026-9539 affects freedesktop.org libslirp (prior to v4.9.2) used on hypervisor host environments (e.g., QEMU). A vulnerability in the TCP urgent data handling (sosendoob) can cause an out-of-bounds heap read and integer underflow, enabling a privileged guest VM attacker (root or CAP_NET_RAW)...

PT-2026-51663

Name of the Vulnerable Software and Affected Versions libslirp versions prior to 4.9.2 Description An integer underflow and out-of-bounds heap read exist in the TCP urgent data handling sosendoob within hypervisor host environments, such as QEMU. A privileged attacker in a guest VM possessing roo...