net/sched: sch_netem: fix out-of-bounds access in packet corruption_CVE-2026-31675

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_netem: fix out-of-bounds access in packet corruption\n\nIn netem_enqueue(), the packet corruption logic uses\nget_random_u32_below(skb_headlen(skb)) to select an index for\nmodifying skb->data. When an AF_PACKET TX_RING sends fully non-linear\npackets over an IPIP tunnel, skb_headlen(skb) evaluates to 0.\n\nPassing 0 to get_random_u32_below() takes the variable-ceil slow path\nwhich returns an unconstrained 32-bit random integer. Using this\nunconstrained value as an offset into skb->data results in an\nout-of-bounds memory access.\n\nFix this by verifying skb_headlen(skb) is non-zero before attempting\nto corrupt the linear data area. Fully non-linear packets will silently\nbypass the corruption logic.",
    "published": "2026-04-25T08:46:51.184Z",
    "modified": "2026-04-27T14:04:56.555Z",
    "type": "cve",
    "title": "net/sched: sch_netem: fix out-of-bounds access in packet corruption",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/a14b56863348686dd0387eea8ce66b85cf455908\nhttps://git.kernel.org/stable/c/13a66ca1e235d4bcd53d12d4c68490cad7f8e46f\nhttps://git.kernel.org/stable/c/3a2999704ac36cfb4041fed3652d26a3373e8d12\nhttps://git.kernel.org/stable/c/4fd258e281fa8bc15e9ce2c7691941537e9258ad\nhttps://git.kernel.org/stable/c/d64cb81dcbd54927515a7f65e5e24affdc73c14b",
    "id": "CVE-2026-31675",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux c865e5d99e25a171e8262fc0f7ba608568633c64\nLinux Linux c865e5d99e25a171e8262fc0f7ba608568633c64\nLinux Linux c865e5d99e25a171e8262fc0f7ba608568633c64\nLinux Linux c865e5d99e25a171e8262fc0f7ba608568633c64\nLinux Linux c865e5d99e25a171e8262fc0f7ba608568633c64\nLinux Linux 2.6.16",
    "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,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "c865e5d99e25a171e8262fc0f7ba608568633c64",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}