ovpn: fix possible use-after-free in ovpn_net_xmit_CVE-2026-45929

{
    "lastseen": "",
    "description": "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.",
    "published": "2026-05-27T12:17:47.891Z",
    "modified": "2026-05-30T10:45:55.720Z",
    "type": "cve",
    "title": "ovpn: fix possible use-after-free in ovpn_net_xmit",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/3e4fbcb4e078915367ba5576cd70d76dbc970f95\nhttps://git.kernel.org/stable/c/442915c96a9bff1c7080e2aedabb1c03faa28d81\nhttps://git.kernel.org/stable/c/a5ec7baa44ea3a1d6aa0ca31c0ad82edf9affe41",
    "id": "CVE-2026-45929",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 08857b5ec5d91d83e69e40a36554a8c7557b7301\nLinux Linux 08857b5ec5d91d83e69e40a36554a8c7557b7301\nLinux Linux 08857b5ec5d91d83e69e40a36554a8c7557b7301\nLinux Linux 6.16",
    "sourceHref": "",
    "cvss": {
        "score": 7.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
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            "privilegesRequired": "",
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            "confidentialityImpact": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "08857b5ec5d91d83e69e40a36554a8c7557b7301",
    "vendor": "Linux",
    "ai_description": "",
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    "ai_score": 0
}