CVE-2026-71973 U-Boot before 2026.10-rc4 Integer Overflow in SquashFS Directory Table Allocation
Attackers can crash the bootloader or potentially execute code by supplying a crafted SquashFS image that triggers an integer overflow in U-Boot.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-71973?
CVE-2026-71973 is a medium-severity vulnerability in u-boot, published on 29 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
U-Boot before 2026.10-rc4 contains an integer overflow vulnerability in sqfs_read_directory_table() function when allocating the directory table buffer. Attackers can supply a crafted SquashFS image with an attacker-controlled superblock metablks_count value that causes heap buffer under-allocation and out-of-bounds writes, corrupting heap memory and crashing the bootloader.
Weakness: CWE-190
Which versions are affected by CVE-2026-71973?
How do I fix CVE-2026-71973?
No fix has been published for CVE-2026-71973 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-71973 being exploited?
There is no known exploitation of CVE-2026-71973 in the wild and no public exploit code.
Sources
Also known as AZL-105723, DEBIAN-CVE-2026-71973, GHSA-7rqg-q392-46rw, UBUNTU-CVE-2026-71973.