bpf: Fix linked reg delta tracking when src_reg == dst_reg_CVE-2026-53092

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix linked reg delta tracking when src_reg == dst_reg\n\nConsider the case of rX += rX where src_reg and dst_reg are pointers to\nthe same bpf_reg_state in adjust_reg_min_max_vals(). The latter first\nmodifies the dst_reg in-place, and later in the delta tracking, the\nsubsequent is_reg_const(src_reg)/reg_const_value(src_reg) reads the\npost-{add,sub} value instead of the original source.\n\nThis is problematic since it sets an incorrect delta, which sync_linked_regs()\nthen propagates to linked registers, thus creating a verifier-vs-runtime\nmismatch. Fix it by just skipping this corner case.",
    "published": "2026-06-24T16:30:31.168Z",
    "modified": "2026-06-28T06:39:15.690Z",
    "type": "cve",
    "title": "bpf: Fix linked reg delta tracking when src_reg == dst_reg",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/d88e8e4a3b52bd5b2ff3eceba4b29d1b5506d066\nhttps://git.kernel.org/stable/c/cc86a8b0a1c54d2bccf6f68cf49b82dea91b84de\nhttps://git.kernel.org/stable/c/d7f14173c0d5866c3cae759dee560ad1bed10d2e",
    "id": "CVE-2026-53092",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 98d7ca374ba4b39e7535613d40e159f09ca14da2\nLinux Linux 98d7ca374ba4b39e7535613d40e159f09ca14da2\nLinux Linux 98d7ca374ba4b39e7535613d40e159f09ca14da2\nLinux Linux 6.11",
    "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": "",
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            "privilegesRequired": "",
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            "confidentialityImpact": "",
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            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "98d7ca374ba4b39e7535613d40e159f09ca14da2",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
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    "ai_score": 0
}