net: skbuff: preserve shared-frag marker during coalescing_CVE-2026-46300

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: preserve shared-frag marker during coalescing\n\nskb_try_coalesce() can attach paged frags from @from to @to.  If @from\nhas SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same\nexternally-owned or page-cache-backed frags, but the shared-frag marker\nis currently lost.\n\nThat breaks the invariant relied on by later in-place writers.  In\nparticular, ESP input checks skb_has_shared_frag() before deciding\nwhether an uncloned nonlinear skb can skip skb_cow_data().  If TCP\nreceive coalescing has moved shared frags into an unmarked skb, ESP can\nsee skb_has_shared_frag() as false and decrypt in place over page-cache\nbacked frags.\n\nPropagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged\nfrags.  The tailroom copy path does not need the marker because it copies\nbytes into @to's linear data rather than transferring frag descriptors.",
    "published": "2026-05-23T11:44:02.231Z",
    "modified": "2026-05-30T10:49:36.824Z",
    "type": "cve",
    "title": "net: skbuff: preserve shared-frag marker during coalescing",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/3599e6b3cc1ada96883d496a50a210d3afbb6987\nhttps://git.kernel.org/stable/c/2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c\nhttps://git.kernel.org/stable/c/9d3e5fd19fe1063bf607219e8562fbd567b8e8d5\nhttps://git.kernel.org/stable/c/78bf6b6bb19541d19fbda6242e7cfe2c682763c0\nhttps://git.kernel.org/stable/c/760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e\nhttps://git.kernel.org/stable/c/3bd9e113d50034db99d7ef69fd8e5242d15e414a\nhttps://git.kernel.org/stable/c/3884358a9286b17f389a72b1426fc4547c23c111\nhttps://git.kernel.org/stable/c/f84eca5817390257cef78013d0112481c503b4a3",
    "id": "CVE-2026-46300",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux cef401de7be8c4e155c6746bfccf721a4fa5fab9\nLinux Linux cef401de7be8c4e155c6746bfccf721a4fa5fab9\nLinux Linux cef401de7be8c4e155c6746bfccf721a4fa5fab9\nLinux Linux cef401de7be8c4e155c6746bfccf721a4fa5fab9\nLinux Linux cef401de7be8c4e155c6746bfccf721a4fa5fab9\nLinux Linux cef401de7be8c4e155c6746bfccf721a4fa5fab9\nLinux Linux cef401de7be8c4e155c6746bfccf721a4fa5fab9\nLinux Linux cef401de7be8c4e155c6746bfccf721a4fa5fab9\nLinux Linux 3.9",
    "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": "cef401de7be8c4e155c6746bfccf721a4fa5fab9",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}