220 lines
12 KiB
JSON
220 lines
12 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-80723",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-08-26T14:34:25.788Z",
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"datePublished": "2026-08-28T06:53:18.485Z",
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"dateUpdated": "2026-10-16T19:26:35.582Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-29T06:22:40.126Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.4,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/of/of_reserved_mem.c"
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],
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"versions": [
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{
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"version": "9a0fe62f93ede02c27aaca81112af1e59c8c0979",
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"lessThan": "68d27250c9e81ab7764603e346c2b1017cb53adf",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "8a6e02d0c00e7b62e6acb74146878bb91e9e7e31",
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"lessThan": "cfa7e2734877330d6c10e0f33953905486c4530c",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "8a6e02d0c00e7b62e6acb74146878bb91e9e7e31",
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"lessThan": "de8ccbd6bf4efe7a059e2c483789936009e10f42",
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"status": "affected",
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},
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"version": "8a6e02d0c00e7b62e6acb74146878bb91e9e7e31",
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"lessThan": "db3dbdfea1b8f38774419c5c2c14e4b81c48708d",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "6.12.13",
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"lessThan": "6.12.103",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/of/of_reserved_mem.c"
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],
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"versions": [
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{
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"version": "6.13",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.13",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.103",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.44",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.8",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.12.13",
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"versionEndExcluding": "6.12.103"
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},
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/68d27250c9e81ab7764603e346c2b1017cb53adf"
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},
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{
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"url": "https://git.kernel.org/stable/c/cfa7e2734877330d6c10e0f33953905486c4530c"
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},
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{
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"url": "https://git.kernel.org/stable/c/de8ccbd6bf4efe7a059e2c483789936009e10f42"
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},
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{
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"url": "https://git.kernel.org/stable/c/db3dbdfea1b8f38774419c5c2c14e4b81c48708d"
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}
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],
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"title": "of: reserved_mem: prevent OOB when too many dynamic regions are defined",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-80723",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T19:21:00.622788Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-16T19:26:35.582Z"
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}
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}
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]
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}
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} |