{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80723", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.788Z", "datePublished": "2026-08-28T06:53:18.485Z", "dateUpdated": "2026-08-29T06:22:40.126Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-29T06:22:40.126Z"}, "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": {"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"}, "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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/of/of_reserved_mem.c"], "versions": [{"version": "9a0fe62f93ede02c27aaca81112af1e59c8c0979", "lessThan": "68d27250c9e81ab7764603e346c2b1017cb53adf", "status": "affected", "versionType": "git"}, {"version": "8a6e02d0c00e7b62e6acb74146878bb91e9e7e31", "lessThan": "cfa7e2734877330d6c10e0f33953905486c4530c", "status": "affected", "versionType": "git"}, {"version": "8a6e02d0c00e7b62e6acb74146878bb91e9e7e31", "lessThan": "de8ccbd6bf4efe7a059e2c483789936009e10f42", "status": "affected", "versionType": "git"}, {"version": "8a6e02d0c00e7b62e6acb74146878bb91e9e7e31", "lessThan": "db3dbdfea1b8f38774419c5c2c14e4b81c48708d", "status": "affected", "versionType": "git"}, {"version": "6.12.13", "lessThan": "6.12.103", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/of/of_reserved_mem.c"], "versions": [{"version": "6.13", "status": "affected"}, {"version": "0", "lessThan": "6.13", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.103", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.44", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.8", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.13", "versionEndExcluding": "6.12.103"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.44"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.1.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.2"}]}]}], "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"}}}}

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{"affected": [{"affectedData": [{"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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-80723", "lastModified": "2026-08-29T07:16:54.343", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-28T08:16:58.113", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/68d27250c9e81ab7764603e346c2b1017cb53adf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cfa7e2734877330d6c10e0f33953905486c4530c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/db3dbdfea1b8f38774419c5c2c14e4b81c48708d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/de8ccbd6bf4efe7a059e2c483789936009e10f42"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: of: reserved_mem: prevent OOB when too many dynamic regions are defined", "id": "2525407", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525407"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nof: reserved_mem: prevent OOB when too many dynamic regions are defined\nOn boot, fdt_scan_reserved_mem() saves each dynamically-placed\n/reserved-memory subnode into a local array of size\nMAX_RESERVED_REGIONS.\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.\nAdd a bounds check that logs an error and skips the excess regions,\nrestoring the original behavior.", "A flaw was found in the `of: reserved_mem` component of the Linux kernel. When the device tree defines more dynamic regions than the `MAX_RESERVED_REGIONS` array can hold, the `fdt_scan_reserved_mem()` function performs an out-of-bounds write. This vulnerability can lead to memory corruption, potentially impacting system stability or allowing for further exploitation."], "name": "CVE-2026-80723", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80723\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80723\nhttps://lore.kernel.org/linux-cve-announce/2026082811-CVE-2026-80723-2526@gregkh/T"], "threat_severity": "Moderate"}