CVE-2026-9539 Affecting qemu-block-rbd package, versions <10:3.1.0-8.amzn2.0.26


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.11% (2nd percentile)

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  • Snyk IDSNYK-AMZN2-QEMUBLOCKRBD-18904899
  • published18 Aug 2026
  • disclosed24 Jun 2026

Introduced: 24 Jun 2026

CVE-2026-9539  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 qemu-block-rbd to version 10:3.1.0-8.amzn2.0.26 or higher.
This issue was patched in ALAS2-2026-3866.

NVD Description

Note: Versions mentioned in the description apply only to the upstream qemu-block-rbd package and not the qemu-block-rbd package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

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).

CVSS Base Scores

version 3.1