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          "value": "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\u0027s linear data rather than transferring frag descriptors."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The corruptible shared-frag condition only arises from local page splicing (sendfile/vmsplice/MSG_SPLICE_PAGES); NIC-received packets never carry SKBFL_SHARED_FRAG, and the skb must reach ESP input via loopback/local SA, so a local account is required.\nAC:L - The attacker controls the spliced file pages, the ESP key and payload, and the packet sizes/timing that drive coalescing on loopback, making the marker loss and in-place decrypt reliably reproducible.\nPR:L - An unprivileged user can splice readable file pages and obtain CAP_NET_ADMIN to install xfrm SAs/policies inside a user+network namespace (unshare -Urn); the global page cache is still corrupted from there.\nUI:N - The attacker performs the splice, IPsec setup, and packet delivery entirely on its own; no victim action is needed to trigger the in-place decrypt over shared frags.\nS:U - The corruption stays within the kernel\u0027s memory authority as a standard local memory-corruption/privilege-escalation primitive, with no crossing of a VM/IOMMU boundary.\nC:H - The write primitive into page-cache memory (e.g., overwriting a shared library\u0027s cached code) can be leveraged into code execution and arbitrary memory disclosure.\nI:H - ESP decrypts attacker-controlled plaintext in place over page-cache-backed pages, yielding an arbitrary write of chosen content into globally-shared file/code memory.\nA:H - Overwriting page-cache pages backing files or executable code corrupts shared kernel state and readily causes oopses, crashes, and system instability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:31:05.381Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3599e6b3cc1ada96883d496a50a210d3afbb6987"
        },
        {
          "url": "https://git.kernel.org/stable/c/2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c"
        },
        {
          "url": "https://git.kernel.org/stable/c/9d3e5fd19fe1063bf607219e8562fbd567b8e8d5"
        },
        {
          "url": "https://git.kernel.org/stable/c/78bf6b6bb19541d19fbda6242e7cfe2c682763c0"
        },
        {
          "url": "https://git.kernel.org/stable/c/760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e"
        },
        {
          "url": "https://git.kernel.org/stable/c/3bd9e113d50034db99d7ef69fd8e5242d15e414a"
        },
        {
          "url": "https://git.kernel.org/stable/c/3884358a9286b17f389a72b1426fc4547c23c111"
        },
        {
          "url": "https://git.kernel.org/stable/c/f84eca5817390257cef78013d0112481c503b4a3"
        }
      ],
      "title": "net: skbuff: preserve shared-frag marker during coalescing",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46300",
    "datePublished": "2026-05-23T11:44:02.231Z",
    "dateReserved": "2026-05-13T15:03:33.111Z",
    "dateUpdated": "2026-09-08T08:49:26.454Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}