{"api_version":"1","generated_at":"2026-08-29T12:12:53+00:00","cve":"CVE-2026-80723","urls":{"html":"https://cve.report/CVE-2026-80723","api":"https://cve.report/api/cve/CVE-2026-80723.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80723","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80723"},"summary":{"title":"of: reserved_mem: prevent OOB when too many dynamic regions are defined","description":"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 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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-28 08:16:58","updated_at":"2026-08-29 07:16:54"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"8.4","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.4,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"8.4","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":8.4,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/de8ccbd6bf4efe7a059e2c483789936009e10f42","name":"https://git.kernel.org/stable/c/de8ccbd6bf4efe7a059e2c483789936009e10f42","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/db3dbdfea1b8f38774419c5c2c14e4b81c48708d","name":"https://git.kernel.org/stable/c/db3dbdfea1b8f38774419c5c2c14e4b81c48708d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cfa7e2734877330d6c10e0f33953905486c4530c","name":"https://git.kernel.org/stable/c/cfa7e2734877330d6c10e0f33953905486c4530c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/68d27250c9e81ab7764603e346c2b1017cb53adf","name":"https://git.kernel.org/stable/c/68d27250c9e81ab7764603e346c2b1017cb53adf","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80723","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80723","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9a0fe62f93ede02c27aaca81112af1e59c8c0979 68d27250c9e81ab7764603e346c2b1017cb53adf git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8a6e02d0c00e7b62e6acb74146878bb91e9e7e31 cfa7e2734877330d6c10e0f33953905486c4530c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8a6e02d0c00e7b62e6acb74146878bb91e9e7e31 de8ccbd6bf4efe7a059e2c483789936009e10f42 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8a6e02d0c00e7b62e6acb74146878bb91e9e7e31 db3dbdfea1b8f38774419c5c2c14e4b81c48708d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12.13 6.12.103 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.13","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.13 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.103 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.44 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.8 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"80723","cve":"CVE-2026-80723","epss":"0.001560000","percentile":"0.050910000","score_date":"2026-08-28","updated_at":"2026-08-29 00:12:17"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/of/of_reserved_mem.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"68d27250c9e81ab7764603e346c2b1017cb53adf","status":"affected","version":"9a0fe62f93ede02c27aaca81112af1e59c8c0979","versionType":"git"},{"lessThan":"cfa7e2734877330d6c10e0f33953905486c4530c","status":"affected","version":"8a6e02d0c00e7b62e6acb74146878bb91e9e7e31","versionType":"git"},{"lessThan":"de8ccbd6bf4efe7a059e2c483789936009e10f42","status":"affected","version":"8a6e02d0c00e7b62e6acb74146878bb91e9e7e31","versionType":"git"},{"lessThan":"db3dbdfea1b8f38774419c5c2c14e4b81c48708d","status":"affected","version":"8a6e02d0c00e7b62e6acb74146878bb91e9e7e31","versionType":"git"},{"lessThan":"6.12.103","status":"affected","version":"6.12.13","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/of/of_reserved_mem.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.13"},{"lessThan":"6.13","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.103","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.44","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.8","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.103","versionStartIncluding":"6.12.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.44","versionStartIncluding":"6.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.8","versionStartIncluding":"6.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"6.13","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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 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."}],"metrics":[{"cvssV3_1":{"baseScore":8.4,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - The overflow only runs in __init boot-time fdt_scan_reserved_mem() while parsing /reserved-memory from the bootloader-provided DTB; there is no post-boot syscall, ioctl, netlink, or network-stack path to this code on OF/DT platforms (arm/arm64/RISC-V/ppc/mips/etc.).\nAC:L - An attacker who can supply a device tree simply defines more than MAX_RESERVED_REGIONS (64) dynamically-placed /reserved-memory subnodes (size without reg); each extra node deterministically performs another unchecked write past dynamic_nodes[] without races or layout luck.\nPR:N - Triggering requires only a crafted device tree delivered at boot (e.g., compromised firmware/OTA image, supply-chain DTB, unauthenticated PXE/TFTP netboot), not privileges on the victim OS; unprivileged local users and user-namespace capabilities cannot reach this __init-only path.\nUI:N - Once a malicious DTB is installed, the stack overflow occurs automatically during early_init_fdt_scan_reserved_mem() before userspace starts; no cooperative action by another user or administrator is required beyond normal boot.\nS:U - Impact is confined to early-boot kernel stack/memory corruption within the same host kernel; this is not a VM escape, guest-to-host breakout, IOMMU boundary bypass, or other cross-security-authority scenario.\nC:H - Each OOB store writes an attacker-influenced FDT node offset past dynamic_nodes[MAX_RESERVED_REGIONS] onto the kernel stack, corrupting adjacent locals and potentially frame/link registers; per kernel guidance, stack OOB writes enable high confidentiality impact.\nI:H - This is a stack buffer overflow (CWE-121/787) during __init: repeated int writes past the 64-element dynamic_nodes[] array can corrupt return addresses and control flow in early boot before full hardening, enabling arbitrary kernel code execution.\nA:H - Unchecked OOB writes into the boot-time stack typically cause immediate kernel panic/oops during fdt_scan_reserved_mem() (corrupted count/fdt pointers or trashed frame), denying availability on every boot with a crafted or over-limit DT."}]}],"providerMetadata":{"dateUpdated":"2026-08-29T06:22:40.126Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}],"title":"of: reserved_mem: prevent OOB when too many dynamic regions are defined","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-80723","datePublished":"2026-08-28T06:53:18.485Z","dateReserved":"2026-08-26T14:34:25.788Z","dateUpdated":"2026-08-29T06:22:40.126Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-28 08:16:58","lastModifiedDate":"2026-08-29 07:16:54","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.4,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.5,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"80723","Ordinal":"1","Title":"of: reserved_mem: prevent OOB when too many dynamic regions are ","CVE":"CVE-2026-80723","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80723","Ordinal":"1","NoteData":"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 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.","Type":"Description","Title":"of: reserved_mem: prevent OOB when too many dynamic regions are "}]}}}