{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-80580",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-08-26T14:34:25.769Z",
        "datePublished": "2026-08-26T14:37:37.917Z",
        "dateUpdated": "2026-08-27T05:02:01.683Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-27T05:02:01.683Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: bound mode sysfs output to the sysfs buffer\n\nmode_string() uses snprintf() which can return a value larger than the\nremaining buffer space. show_modes() accumulates the return value into i\nwithout checking whether i has reached PAGE_SIZE, causing the offset to\nadvance past the sysfs buffer if the modelist is long enough.\n\nAdd a size parameter to mode_string() and use scnprintf() to return\nonly the bytes actually written. Add an early return when offset\nalready exceeds the buffer. In show_modes(), stop accumulating once\nthe buffer is full."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 7.8,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:L - The bug is reached only by a local read(2) on /sys/class/graphics/fbN/modes, which flows through sysfs/kernfs into show_modes(); there is no network, adjacent-network, or physical-device packet path to this framebuffer sysfs handler.\nAC:L - Once the framebuffer modelist is long enough to fill PAGE_SIZE, snprintf's oversized return value deterministically pushes the offset past the buffer and subsequent writes use a wrapped huge size; an attacker can also grow the list via repeated FBIOPUT_VSCREENINFO or a privileged store_modes write.\nPR:L - The modes sysfs attribute is DEVICE_ATTR_RW with mode 0644, so any unprivileged local user can open and read it without capabilities; only populating an unusually long modelist may require root or membership in the video group for /dev/fb0 ioctl access.\nUI:N - Exploitation requires only the attacker reading the modes sysfs file themselves; no separate victim action such as mounting a filesystem or opening a file is needed.\nS:U - The overflow corrupts kernel heap memory within the same OS security boundary and can enable local privilege escalation, but it does not cross VM, IOMMU, or sandbox isolation boundaries.\nC:H - Writing past the PAGE_SIZE sysfs seq_file buffer is an out-of-bounds kernel heap write; once the offset exceeds PAGE_SIZE the remaining-length underflow gives snprintf an enormous size, corrupting adjacent kmalloc objects and enabling information disclosure.\nI:H - The unchecked offset advance causes repeated out-of-bounds writes into kernel heap memory beyond the sysfs buffer, a memory-corruption primitive that can be leveraged for arbitrary kernel writes or control-flow hijacking.\nA:H - Corrupting heap objects adjacent to the sysfs read buffer can trigger immediate kernel oops/panic or later crashes when those objects are used, satisfying High availability impact for kernel memory corruption."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/video/fbdev/core/fbsysfs.c"
                    ],
                    "versions": [
                        {
                            "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                            "lessThan": "873a1aa15c313263f2e18b38cf525623cc4fabf6",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                            "lessThan": "d15d51fb26e830af58f3f21964f1c09c239077ea",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/video/fbdev/core/fbsysfs.c"
                    ],
                    "versions": [
                        {
                            "version": "2.6.12",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "2.6.12",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.10",
                            "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": "2.6.12",
                                    "versionEndExcluding": "7.1.10"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.12",
                                    "versionEndExcluding": "7.2"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/873a1aa15c313263f2e18b38cf525623cc4fabf6"
                },
                {
                    "url": "https://git.kernel.org/stable/c/d15d51fb26e830af58f3f21964f1c09c239077ea"
                }
            ],
            "title": "fbdev: bound mode sysfs output to the sysfs buffer",
            "x_generator": {
                "engine": "bippy-1.2.0"
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    }
}