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CVE-2026-74221— U-Boot before 2026.10-rc5 Buffer Overflow via NFS READLINK

Quick assessment

Affected
u-boot u-boot
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

U-Boot before 2026.10-rc5 contains a buffer overflow in nfs_readlink_reply() function in net/nfs-common.c when processing NFS server responses. A malicious NFS server can send crafted READLINK replies with negative or oversized symlink length values to corrupt

CVSS 8.2 · High
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I. Basic Information for CVE-2026-74221

Vulnerability Information

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Vulnerability Title
U-Boot before 2026.10-rc5 Buffer Overflow via NFS READLINK
Source: CVE Program / CVE List V5
Vulnerability Description
U-Boot before 2026.10-rc5 contains a buffer overflow in nfs_readlink_reply() function in net/nfs-common.c when processing NFS server responses. A malicious NFS server can send crafted READLINK replies with negative or oversized symlink length values to corrupt memory and crash the bootloader.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
有符号至无符号转换错误
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
u-boot u-boot 0 ~ 2026.10-rc5 -

II. Public POCs for CVE-2026-74221

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III. Intelligence Information for CVE-2026-74221

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Other References for CVE-2026-74221 (4)

Same Patch Batch · u-boot · 2026-09-29 · 8 CVEs total

CVE-2026-74222 8.2 HIGH U-Boot before 2026.10-rc5 Use-After-Free in lwIP wget Receive Callback
CVE-2026-74220 8.2 HIGH U-Boot before 2026.10-rc5 Buffer Overflow via NFS READ Reply
CVE-2026-71971 8.2 HIGH U-Boot before 2026.10-rc3 Out-of-Bounds Write in IP Fragment Reassembly
CVE-2026-74225 7.1 HIGH U-Boot before 2026.10-rc5 Out-of-Bounds Write via DHCPv6
CVE-2026-71972 5.9 MEDIUM U-Boot through 2026.10-rc5 Out-of-Bounds Write in BMP RLE8 Decoder
CVE-2026-71973 5.2 MEDIUM U-Boot before 2026.10-rc4 Integer Overflow in SquashFS Directory Table Allocation
CVE-2026-71974 4.8 MEDIUM U-Boot before 2026.10-rc3 Out-of-Bounds Write via Android Bootmeth Partition Read

IV. Related Vulnerabilities

Same product: u-boot
Same vendor: u-boot
Same weakness: CWE-195

V. Comments for CVE-2026-74221

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