{"id":"CVE-2026-71971","state":"PUBLISHED","title":"U-Boot before 2026.10-rc3 Out-of-Bounds Write in IP Fragment Reassembly","description":"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 netboot to corrupt adjacent memory and crash the bootloader.","publishedAt":"2026-09-29T21:29:20.055Z","updatedAt":"2026-09-30T14:03:55.512Z","severity":{"score":8.8,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["u-boot u-boot"],"affected":[{"vendor":"u-boot","product":"u-boot","packageURL":"pkg:github/u-boot/u-boot","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"2026.10-rc3","versionType":"custom"}],"repo":"https://github.com/u-boot/u-boot"}],"references":["https://github.com/u-boot/u-boot/commit/04ca915d5bf39dda5d1bce62d04d2b59d293c5b9","https://github.com/u-boot/u-boot/blob/v2026.07/net/net.c#L975","https://github.com/u-boot/u-boot","https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc3-out-of-bounds-write-in-ip-fragment-reassembly"],"weaknesses":["CWE-787"],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/71xxx/CVE-2026-71971.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-71971","state":"PUBLISHED","datePublished":"2026-09-29T21:29:20.055Z","dateUpdated":"2026-09-30T14:03:55.512Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-08-08T16:43:04.178Z"},"containers":{"cna":{"title":"U-Boot before 2026.10-rc3 Out-of-Bounds Write in IP Fragment Reassembly","descriptions":[{"lang":"en","value":"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. 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