net: guard timestamp cmsgs to real error queue skbs_CVE-2026-53223

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: guard timestamp cmsgs to real error queue skbs\n\nskb_is_err_queue() treats PACKET_OUTGOING as the sole marker for an skb\nfrom sk_error_queue. That assumption is not true for AF_PACKET sockets:\noutgoing packet taps are also delivered to packet sockets with\nskb->pkt_type == PACKET_OUTGOING, but their skb->cb is owned by AF_PACKET\ninstead of struct sock_exterr_skb.\n\nIf such an skb is received with timestamping enabled, the generic\ntimestamp cmsg path can read AF_PACKET control-buffer state as\nsock_exterr_skb::opt_stats. With SO_RXQ_OVFL enabled, the packet drop\ncounter overlaps opt_stats. An odd drop count makes the path emit\nSCM_TIMESTAMPING_OPT_STATS with skb->len and skb->data. For non-linear\nskbs this copies past the linear head and can trigger hardened usercopy or\ndisclose adjacent heap contents.\n\nKeep skb_is_err_queue() local to net/socket.c, but make it verify that\nthe PACKET_OUTGOING marker is paired with the sock_rmem_free destructor\ninstalled by sock_queue_err_skb(). AF_PACKET receive skbs use normal\nreceive ownership and no longer pass as error-queue skbs, while legitimate\nsk_error_queue entries keep the PACKET_OUTGOING marker and sock_rmem_free\nownership.",
    "published": "2026-06-25T08:39:24.588Z",
    "modified": "2026-06-28T06:40:34.222Z",
    "type": "cve",
    "title": "net: guard timestamp cmsgs to real error queue skbs",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/24a0d548d3a765cd4558224e4f8e06e14cba26e3\nhttps://git.kernel.org/stable/c/71ff5cdd5da61d0438e902aa0fd68c28bc901abe\nhttps://git.kernel.org/stable/c/ad9a0374ee6d11048e1f74cd5180bad58b9848b4\nhttps://git.kernel.org/stable/c/b903e9b5629ec8dd6db92174070045bf81ad7060\nhttps://git.kernel.org/stable/c/e0665b2a8e90bb08bd205062c75662b502d31797\nhttps://git.kernel.org/stable/c/3dde4fb941fa5649ab809f6cd3e20e0c424a4e31\nhttps://git.kernel.org/stable/c/eb51a9ad3ceb01bc6c0fb608dbc856e03ee6f24a\nhttps://git.kernel.org/stable/c/1ee90b77b727df903033db873c75caac5c27ec98",
    "id": "CVE-2026-53223",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 8605330aac5a5785630aec8f64378a54891937cc\nLinux Linux 8605330aac5a5785630aec8f64378a54891937cc\nLinux Linux 8605330aac5a5785630aec8f64378a54891937cc\nLinux Linux 8605330aac5a5785630aec8f64378a54891937cc\nLinux Linux 8605330aac5a5785630aec8f64378a54891937cc\nLinux Linux 8605330aac5a5785630aec8f64378a54891937cc\nLinux Linux 8605330aac5a5785630aec8f64378a54891937cc\nLinux Linux 8605330aac5a5785630aec8f64378a54891937cc\nLinux Linux cdaf15b43bd31003220cb080bcbbd57787a2fca9\nLinux Linux 4.10.14\nLinux Linux 4.11",
    "sourceHref": "",
    "cvss": {
        "score": 7.1,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
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        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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            "baseScore": 0,
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            "privilegesRequired": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "8605330aac5a5785630aec8f64378a54891937cc",
    "vendor": "Linux",
    "ai_description": "",
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    "ai_score": 0
}