{"id":"CVE-2026-29007","summary":"U-Boot 2026.04-rc3 Out-of-Bounds Read in tcp_rx_state_machine via tcp.c","details":"U-Boot through 2026.04-rc3 contains an out-of-bounds read vulnerability in tcp_rx_state_machine() (net/tcp.c) when CONFIG_PROT_TCP is enabled, allowing remote attackers to read beyond TCP segment boundaries by crafting a malicious packet with a mismatched IP total length and TCP data offset field. Attackers can send a packet with an IP total length of 40 bytes and a TCP data offset claiming 60 bytes of header to cause tcp_parse_options() to read 40 bytes past the end of the TCP segment, potentially corrupting connection state variables such as rmt_win_scale and rmt_timestamp to disrupt TCP window calculations.","modified":"2026-08-12T03:51:44.256836992Z","published":"2026-07-08T16:11:25.888Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-125"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29007.json"},"references":[{"type":"WEB","url":"https://u-boot.org/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29007.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-29007"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/u-boot-rc3-out-of-bounds-read-in-tcp-rx-state-machine-via-tcp-c"},{"type":"REPORT","url":"https://lists.denx.de/pipermail/u-boot/2026-May/617853.html"},{"type":"PACKAGE","url":"https://github.com/u-boot/u-boot"},{"type":"EVIDENCE","url":"https://y637f9qq2x.com/posts/u-boot-tcp-nfs-vulns/"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/u-boot/u-boot","events":[{"introduced":"0"},{"fixed":"88dc2788777babfd6322fa655df549a019aa1e69"},{"introduced":"aa4f687977a449686498236722ee5e93d8b39918"},{"last_affected":"4f70106beafe30df8b0528a3d8b2543cd48fe241"}],"database_specific":{"cpe":["cpe:2.3:a:denx:u-boot:*:*:*:*:*:*:*:*","cpe:2.3:a:denx:u-boot:2026.04:rc1:*:*:*:*:*:*","cpe:2.3:a:denx:u-boot:2026.04:rc2:*:*:*:*:*:*","cpe:2.3:a:denx:u-boot:2026.04:rc3:*:*:*:*:*:*"],"extracted_events":[{"introduced":"0"},{"fixed":"2026.04"},{"introduced":"2026.04-rc1"},{"last_affected":"2026.04-rc1"},{"introduced":"2026.04-rc2"},{"last_affected":"2026.04-rc2"},{"introduced":"2026.04-rc3"},{"last_affected":"2026.04-rc3"}],"source":["CPE_RANGE","CPE_STRING"]}}],"versions":["2026.04-rc1","2026.04-rc2","2026.04-rc3","v2026.04-rc4","v2026.04-rc5","v2026.04-rc3","v2026.04-rc2","v2026.04-rc1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-29007.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"}]}