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OpenAdvisories
High WID-SEC-2026-3660 8 CVEs

DENX U-Boot: Mehrere Schwachstellen

Published Sep 29, 2026 · Updated Oct 21, 2026 · Revision 4 · de-DE

Vendor: denx Vendor: Ubuntu Product: Linux Product: U-Boot

Summary

Ein Angreifer kann mehrere Schwachstellen in DENX U-Boot ausnutzen, um den Speicher zu beschädigen, Denial-of-Service-Zustände herbeizuführen oder andere, nicht näher spezifizierte Angriffe zu starten.

Product

U-Boot ist ein weit verbreiteter Open-Source-Bootloader.

Vulnerabilities 8

  • High 8.2
    CVE-2026-71971

    U-Boot before 2026.10-rc3 Out-of-Bounds Write in IP Fragment Reassembly

    U-Boot before 2026.10-rc3 with CONFIG_IP_DEFRAG enabled contains an out-of-bounds write vulnerability in the __net_defragment() function in net/net.c. Remote attackers can send a crafted IP fragment with non-zero offset and More-Fragments flag set during netb…

    Uboot u-boot qemu u-boot Debian Ubuntu Azure Linux
  • High 8.2
    CVE-2026-74220

    U-Boot before 2026.10-rc5 Buffer Overflow via NFS READ Reply

    U-Boot before 2026.10-rc5 contains a buffer overflow in nfs_read_reply() function in net/nfs-common.c that allows attackers to corrupt memory by supplying crafted NFS READ reply lengths. A malicious NFS server can exploit signed integer handling to bypass len…

    Uboot u-boot qemu u-boot Debian Ubuntu Azure Linux
  • High 8.2
    CVE-2026-74221

    U-Boot before 2026.10-rc5 Buffer Overflow via NFS READLINK

    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 corrup…

    Uboot u-boot qemu u-boot Debian Ubuntu Azure Linux
  • High 8.2
    CVE-2026-74222

    U-Boot before 2026.10-rc5 Use-After-Free in lwIP wget Receive Callback

    U-Boot before 2026.10-rc5 contains a use-after-free vulnerability in the httpc_recv_cb() function within the lwIP wget implementation. When HTTP data storage fails, the callback frees the connection PCB but returns ERR_BUF instead of ERR_ABRT, causing the TCP…

    Uboot u-boot u-boot u-boot-nezha Ubuntu
  • High 7.1
    CVE-2026-74225

    U-Boot before 2026.10-rc5 Out-of-Bounds Write via DHCPv6

    U-Boot before 2026.10-rc5 contains out-of-bounds memory access in dhcp6_parse_options() that fails to validate SERVERID and CLIENTID option lengths from DHCPv6 packets. Attackers on the local network can send crafted DHCPv6 ADVERTISE or REPLY packets during n…

    Uboot u-boot u-boot u-boot Debian Ubuntu
  • Medium 5.9
    CVE-2026-71972

    U-Boot < 2027.01-rc1 Out-of-Bounds Write in BMP RLE8 Decoder

    U-Boot before 2027.01-rc1 contains an out-of-bounds write vulnerability in the video_display_rle8_bitmap function in drivers/video/video_bmp.c. Attackers can supply a crafted RLE8-compressed BMP image to corrupt memory adjacent to the framebuffer and crash th…

    Uboot u-boot qemu u-boot Debian Ubuntu Azure Linux
  • Medium 5.2
    CVE-2026-71973

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

    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 …

    Uboot u-boot qemu u-boot Debian Ubuntu Azure Linux
  • Medium 4.8
    CVE-2026-71974

    U-Boot before 2026.10-rc3 Out-of-Bounds Write via Android Bootmeth Partition Read

    U-Boot before 2026.10-rc3 contains an out-of-bounds write vulnerability in read_slotted_partition() that fails to validate image size against partition bounds. Attackers with physical access can supply crafted boot media with oversized headers to write past t…

    Uboot u-boot u-boot u-boot-nezha Ubuntu

Revision history

  1. #4

    Neue Updates von Ubuntu aufgenommen

  2. #3

    Neue Updates von Ubuntu aufgenommen

  3. #2

    Neue Updates von Ubuntu aufgenommen

  4. #1

    Initiale Fassung

References