net: add pskb_may_pull() to skb_gro_receive_list()_CVE-2026-53235

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: add pskb_may_pull() to skb_gro_receive_list()\n\nskb_gro_receive_list() calls skb_pull(skb, skb_gro_offset(skb)) without\nfirst ensuring the data is in the linear area via pskb_may_pull(). When\nthe skb arrives via napi_gro_frags(), skb_headlen can be 0 (all data in\npage fragments) while skb_gro_offset is non-zero (after IP+TCP header\nparsing). The skb_pull() then decrements skb->len by skb_gro_offset\nbut skb->data_len stays unchanged, hitting BUG_ON(skb->len < skb->data_len)\nin __skb_pull().\n\nThe UDP fraglist GRO path already contains this guard at\nudp_offload.c:749. Adding it to skb_gro_receive_list() itself provides\ncentralized protection for all callers (TCP, UDP, and any future\nprotocols), and ensures the precondition of skb_pull() is satisfied\nbefore it is called.\n\nOn pskb_may_pull() failure, set NAPI_GRO_CB(skb)->flush = 1 so the\nskb is not held as a new GRO head and is instead delivered through the\nnormal receive path, matching the UDP handling.",
    "published": "2026-06-25T08:39:32.518Z",
    "modified": "2026-06-28T06:40:45.131Z",
    "type": "cve",
    "title": "net: add pskb_may_pull() to skb_gro_receive_list()",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/9e636c995b7beeb74ea882968248752821c244c4\nhttps://git.kernel.org/stable/c/0cde3a004119db637b401c54e77536e4145fc0b4\nhttps://git.kernel.org/stable/c/848571dcbbbea7ba44dd4f7ebe1fbb274afe08ac\nhttps://git.kernel.org/stable/c/f2bb3434544454099a5b6dec213567267b05d79d",
    "id": "CVE-2026-53235",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 8d95dc474f85481652a0e422d2f1f079de81f63c\nLinux Linux 8d95dc474f85481652a0e422d2f1f079de81f63c\nLinux Linux 8d95dc474f85481652a0e422d2f1f079de81f63c\nLinux Linux 8d95dc474f85481652a0e422d2f1f079de81f63c\nLinux Linux 6.10",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "8d95dc474f85481652a0e422d2f1f079de81f63c",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}