{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-45929",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-05-13T15:03:33.086Z",
        "datePublished": "2026-05-27T12:17:47.891Z",
        "dateUpdated": "2026-08-05T12:28:44.254Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:28:44.254Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\novpn: fix possible use-after-free in ovpn_net_xmit\n\nWhen building the skb_list in ovpn_net_xmit, skb_share_check will free\nthe original skb if it is shared. The current implementation continues\nto use the stale skb pointer for subsequent operations:\n- peer lookup,\n- skb_dst_drop (even though all segments produced by skb_gso_segment\n  will have a dst attached),\n- ovpn_peer_stats_increment_tx.\n\nFix this by moving the peer lookup and skb_dst_drop before segmentation\nso that the original skb is still valid when used. Return early if all\nsegments fail skb_share_check and the list ends up empty.\nAlso switch ovpn_peer_stats_increment_tx to use skb_list.next; the next\npatch fixes the stats logic."
                }
            ],
            "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 vulnerable code is `ovpn_net_xmit`, the netdevice TX path (ndo_start_xmit), triggered by transmitting a packet out the local ovpn tunnel interface; the triggering precondition (a shared skb) is a local TX-side artifact and cannot be induced by a remote peer, whose data flows through the separate RX path.\nAC:L - The attacker controls both sides — arranging the skb-sharing reference holder and initiating the transmit — so the use-after-free race is within their control; choosing the higher-severity value where exploitation reliability is uncertain.\nPR:L - Creating an ovpn device and establishing the shared-skb condition requires CAP_NET_ADMIN/CAP_NET_RAW, which an unprivileged user can obtain inside a user namespace (unshare -Urn), so this is Low rather than High.\nUI:N - The bug is triggered purely by transmitting packets through the interface; no victim action is required.\nS:U - The use-after-free is contained within the kernel's own security authority and does not cross into a different security scope such as a VM or IOMMU boundary.\nC:H - A use-after-free read of the freed skb (protocol, data, len) lets an attacker who controls the reclaimed object contents read sensitive kernel memory.\nI:H - The use-after-free can be leveraged via heap grooming of the freed skb to corrupt kernel state and achieve write/control-flow primitives.\nA:H - Dereferencing the freed skb readily causes a kernel oops/panic, a full denial of service."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/net/ovpn/io.c"
                    ],
                    "versions": [
                        {
                            "version": "08857b5ec5d91d83e69e40a36554a8c7557b7301",
                            "lessThan": "3e4fbcb4e078915367ba5576cd70d76dbc970f95",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "08857b5ec5d91d83e69e40a36554a8c7557b7301",
                            "lessThan": "442915c96a9bff1c7080e2aedabb1c03faa28d81",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "08857b5ec5d91d83e69e40a36554a8c7557b7301",
                            "lessThan": "a5ec7baa44ea3a1d6aa0ca31c0ad82edf9affe41",
                            "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/net/ovpn/io.c"
                    ],
                    "versions": [
                        {
                            "version": "6.16",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.16",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.14",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19.4",
                            "lessThanOrEqual": "6.19.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0",
                            "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": "6.16",
                                    "versionEndExcluding": "6.18.14"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.16",
                                    "versionEndExcluding": "6.19.4"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.16",
                                    "versionEndExcluding": "7.0"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/3e4fbcb4e078915367ba5576cd70d76dbc970f95"
                },
                {
                    "url": "https://git.kernel.org/stable/c/442915c96a9bff1c7080e2aedabb1c03faa28d81"
                },
                {
                    "url": "https://git.kernel.org/stable/c/a5ec7baa44ea3a1d6aa0ca31c0ad82edf9affe41"
                }
            ],
            "title": "ovpn: fix possible use-after-free in ovpn_net_xmit",
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                "engine": "bippy-1.2.0"
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}