{"id":"CVE-2026-80723","title":"of: reserved_mem: prevent OOB when too many dynamic regions are defined","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nof: reserved_mem: prevent OOB when too many dynamic regions are defined\n\nOn boot, fdt_scan_reserved_mem() saves each dynamically-placed\n/reserved-memory subnode into a …","severity":"high","cvss":8.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 9a0fe62f93ede02c27aaca81112af1e59c8c0979 < 68d27250c9e81ab7764603e346c2b1017cb53adf","Linux >= 8a6e02d0c00e7b62e6acb74146878bb91e9e7e31 < cfa7e2734877330d6c10e0f33953905486c4530c","Linux >= 8a6e02d0c00e7b62e6acb74146878bb91e9e7e31 < de8ccbd6bf4efe7a059e2c483789936009e10f42","Linux >= 8a6e02d0c00e7b62e6acb74146878bb91e9e7e31 < db3dbdfea1b8f38774419c5c2c14e4b81c48708d","Linux >= 6.12.13 < 6.12.103","Linux 6.13"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T19:21:00.622788Z"},"published":"2026-08-28","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:26:35.582Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80723","references":[{"url":"https://git.kernel.org/stable/c/68d27250c9e81ab7764603e346c2b1017cb53adf"},{"url":"https://git.kernel.org/stable/c/cfa7e2734877330d6c10e0f33953905486c4530c"},{"url":"https://git.kernel.org/stable/c/de8ccbd6bf4efe7a059e2c483789936009e10f42"},{"url":"https://git.kernel.org/stable/c/db3dbdfea1b8f38774419c5c2c14e4b81c48708d"}],"tags":["cve.org"],"epss":0.00132,"epssPercentile":0.0249,"ingestedAt":"2026-10-16T19:46:24.302Z","slug":"CVE-2026-80723","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nof: reserved_mem: prevent OOB when too many dynamic regions are defined\n\nOn boot, fdt_scan_reserved_mem() saves each dynamically-placed\n/reserved-memory subnode into a local array of size\nMAX_RESERVED_REGIONS.\n\nIf the device tree defines more than MAX_RESERVED_REGIONS\ndynamically-placed regions, fdt_scan_reserved_mem() writes past the\nend of the local array.\n\nAdd a bounds check that logs an error and skips the excess regions,\nrestoring the original behavior.\n\n## Affected\n\n- `Linux >= 9a0fe62f93ede02c27aaca81112af1e59c8c0979 < 68d27250c9e81ab7764603e346c2b1017cb53adf`\n- `Linux >= 8a6e02d0c00e7b62e6acb74146878bb91e9e7e31 < cfa7e2734877330d6c10e0f33953905486c4530c`\n- `Linux >= 8a6e02d0c00e7b62e6acb74146878bb91e9e7e31 < de8ccbd6bf4efe7a059e2c483789936009e10f42`\n- `Linux >= 8a6e02d0c00e7b62e6acb74146878bb91e9e7e31 < db3dbdfea1b8f38774419c5c2c14e4b81c48708d`\n- `Linux >= 6.12.13 < 6.12.103`\n- `Linux 6.13`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":46.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}