{"id":"CVE-2026-74221","title":"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","summary":"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 l…","severity":"high","cvss":8.2,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","cwe":["CWE-195"],"vendor":"u-boot","product":"u-boot","affected":["u-boot < 2026.10-rc5"],"published":"2026-09-29","updated":"2026-09-29","sourceUpdated":"2026-09-29T22:18:33.493","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74221","references":[{"url":"https://github.com/u-boot/u-boot","label":"disclosure@vulncheck.com"},{"url":"https://github.com/u-boot/u-boot/blob/v2026.07/net/nfs-common.c#L643","label":"disclosure@vulncheck.com"},{"url":"https://github.com/u-boot/u-boot/commit/1c0aff3a5fbfeee7a8948f624e0b8554e6e0d8fd","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-buffer-overflow-via-nfs-readlink","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-29T21:49:08.267Z","slug":"CVE-2026-74221","body":"## Overview\n\nU-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":45.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}