CVE-2026-71973
U-Boot before 2026.10-rc4 Integer Overflow in SquashFS Directory Table Allocation
- State
- Published
- Severity
- 5.2 Medium
- Published
- Sep 29, 2026
- Updated
- Oct 2, 2026
- Reserved
- Aug 8, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.2 Medium | CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 5.2 Medium | CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H | VulnCheck |
Weaknesses
- CWE-190 Integer Overflow or Wraparound
Affected Products
| Product | Versions |
|---|---|
u-bootu-boot |
|
References
- https://github.com/u-boot/u-boot/commit/561ae28cb56a082cfa90c1c421c4955bc215470bpatch
- https://github.com/u-boot/u-boot/blob/v2026.07/fs/squashfs/sqfs.c#L814technical-description
- https://github.com/u-boot/u-bootproduct
- VulnCheck Advisory: U-Boot before 2026.10-rc4 Integer Overflow in SquashFS Directory Table Allocationthird-party-advisory
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