U-Boot before 2026.10-rc4 Integer Overflow in SquashFS Directory Table Allocation (CVE-2026-71973) | HOL Guard CVE

Medium · CVSS 5.2CVE-2026-71973

U-Boot before 2026.10-rc4 Integer Overflow in SquashFS Directory Table Allocation

Answer in brief

CVE-2026-71973 records a Medium severity (CVSS 5.2) vulnerability in U-Boot before 2026.10-rc4 Integer Overflow in SquashFS Directory Table Allocation. The current sources do not mark it as known exploited. The current feed maps u-boot/u-boot (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 29, 2026Updated Sep 29, 2026Source checked Sep 29, 2026First seen by HOL Sep 29, 2026Material review Sep 29, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.2
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 5.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps u-boot/u-boot (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
u-boot/u-bootgeneric	>=0 <2026.10-rc4	2026.10-rc4

Recommended response

Check inventory. Check lockfiles and deployed manifests for u-boot/u-boot.
Review the reported fix. Update u-boot/u-boot to 2026.10-rc4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 29, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.