{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-68287",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-07-30T09:28:09.380Z",
        "datePublished": "2026-08-10T12:02:20.110Z",
        "dateUpdated": "2026-08-17T05:02:22.526Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-17T05:02:22.526Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrop_monitor: fix size calculations for 64-bit attributes\n\nnet_dm_packet_report_fill() and net_dm_hw_packet_report_fill() use\nnla_put_u64_64bit() to append 64-bit attributes (NET_DM_ATTR_PC and\nNET_DM_ATTR_TIMESTAMP).\n\nOn 32-bit architectures without CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS,\nnla_put_u64_64bit() may append a 4-byte NET_DM_ATTR_PAD attribute for\n64-bit alignment.\n\nHowever, net_dm_packet_report_size() and net_dm_hw_packet_report_size()\nused nla_total_size(sizeof(u64)) instead of nla_total_size_64bit(sizeof(u64)),\nbudgeting 12 bytes instead of up to 16 bytes.\n\nThis under-estimation of SKB size can lead to an skb_over_panic() when\n__nla_reserve() or skb_put() is subsequently called.\n\nFix this by using nla_total_size_64bit(sizeof(u64)) in both size calculations."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                        "baseScore": 7.5,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:N - The report path runs in net/core/drop_monitor.c whenever a received packet is dropped or hardware-trapped; a remote unauthenticated attacker triggers it simply by sending packets that get dropped, and controls skb->len which feeds payload_len and thus the under-sized allocation.\nAC:L - On an affected build the attacker can drive the path at will, tuning packet length byte-by-byte to land the under-budgeted skb exactly at an allocator bucket boundary; no race or unpredictable state is involved.\nPR:N - Enabling packet-alert mode is the victim administrator's monitoring configuration; the attacker's own action is only sending packets that get dropped, which needs no account, credentials or privileges on the target.\nUI:N - The drop-report path is executed automatically by the kernel workqueue when packets are dropped; no local user action is needed.\nS:U - The under-allocated skb and the resulting skb_over_panic() are entirely within the kernel's own security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:N - __nla_reserve() detects the overrun in skb_put() and panics before any data is written or read past the buffer, so no memory contents are disclosed to the attacker.\nI:N - skb_over_panic() aborts before the out-of-bounds payload copy occurs, so no adjacent memory is modified and no control-flow primitive is obtained.\nA:H - The size under-estimation makes skb_put() exceed skb->end, invoking skb_over_panic() which calls BUG() and takes down the machine, a complete and repeatable denial of service."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/core/drop_monitor.c"
                    ],
                    "versions": [
                        {
                            "version": "ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f",
                            "lessThan": "4a9e30764e80693bcf875c776170edce20f94fe0",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f",
                            "lessThan": "7089f7ab99c89f443c92d8fcc585e63f2727f0b3",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/core/drop_monitor.c"
                    ],
                    "versions": [
                        {
                            "version": "5.4",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.4",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.6",
                            "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": "5.4",
                                    "versionEndExcluding": "7.1.6"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.4",
                                    "versionEndExcluding": "7.2"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/4a9e30764e80693bcf875c776170edce20f94fe0"
                },
                {
                    "url": "https://git.kernel.org/stable/c/7089f7ab99c89f443c92d8fcc585e63f2727f0b3"
                }
            ],
            "title": "drop_monitor: fix size calculations for 64-bit attributes",
            "x_generator": {
                "engine": "bippy-1.2.0"
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}