grub2 vulnerability

About this tag
The grub2 vulnerability tag covers recent security flaws in the GRUB2 bootloader, specifically CVE-2025-61661 and CVE-2025-61662. CVE-2025-61661 is an out-of-bounds write during USB string handling that can cause a denial-of-service or limited data corruption when a malicious USB device is present during boot. CVE-2025-61662 is a use-after-free bug in the gettext module that leads to bootloader crashes. Both vulnerabilities have received upstream patches, and administrators are advised to apply vendor updates and implement device controls. These issues affect Linux distributions and recovery environments that rely on GRUB2.

  1. GRUB2 CVE-2025-61661: Bootloader DoS via USB Strings

    A new GRUB2 vulnerability, tracked as CVE-2025-61661, permits an out‑of‑bounds write during USB string handling that can crash the bootloader when a maliciously‑crafted USB device is present during boot, producing a denial‑of‑service and a limited risk of data corruption; the defect is narrow...
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    • boot security grub2 vulnerability patch management usb security
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    • Forum: Security Alerts

  2. CVE-2025-61662: GRUB2 Use-After-Free Bug Crashes Bootloader

    A recently disclosed use‑after‑free defect in the GRUB2 bootloader — tracked as CVE‑2025‑61662 — stems from a missing unregister call in the gettext module and can lead to grub crashes and denial‑of‑service on affected systems. Background / Overview GRUB (GRand Unified Bootloader) is the de...
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    • boot security cve 2025 61662 grub2 vulnerability use-after-free
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    • Forum: Security Alerts