CVE-2026-46323 (GCVE-0-2026-46323)
Vulnerability from cvelistv5
Published
2026-06-09 12:11
Modified
2026-08-25 12:05
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: gro: don't merge zcopy skbs skb_gro_receive() can currently copy frags between the source and GRO skb, without checking the zerocopy status, and in particular the SKBFL_MANAGED_FRAG_REFS flag. When SKBFL_MANAGED_FRAG_REFS is set, the skb doesn't hold a reference on the pages in shinfo->frags. Appending those frags to another skb's frags without fixing up the page refcount can lead to UAF. When either the last skb in the GRO chain (the one we would append frags to) or the source skb is zerocopy, don't merge the skbs.
References
Impacted products
Vendor Product Version
Linux Linux Version: 753f1ca4e1e50248a1b760c9774d6d6b354562cc
Version: 753f1ca4e1e50248a1b760c9774d6d6b354562cc
Version: 753f1ca4e1e50248a1b760c9774d6d6b354562cc
Version: 753f1ca4e1e50248a1b760c9774d6d6b354562cc
Version: 753f1ca4e1e50248a1b760c9774d6d6b354562cc
Version: 753f1ca4e1e50248a1b760c9774d6d6b354562cc
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              "value": "AV:L - Exploitation requires a local attacker to inject zerocopy/managed-frags skbs via io_uring SEND_ZC, TUN/TAP, or similar local APIs; ordinary remote wire packets processed by GRO do not carry SKBFL_MANAGED_FRAG_REFS, so a network-only attacker cannot reach the buggy merge path.\nAC:L - The attacker fully controls both sides of the GRO merge (seed and zerocopy TCP segments over a veth pair), timing (netem delay, RST race), and buffer setup; a public working LPE exploit exists, so success does not depend on conditions outside attacker control.\nPR:L - Triggering requires only a basic unprivileged local account with io_uring and user-namespace access (unshare -Urn), which is the default on many distributions; no init-namespace root or CAP_NET_ADMIN is needed.\nUI:N - No victim user action is required; the attacker drives the entire exploit autonomously through syscalls and local network namespace setup.\nS:U - Impact is standard host-kernel privilege escalation (root on the same kernel); it does not cross a distinct hypervisor/IOMMU security boundary such as VM-guest-to-host escape.\nC:H - The flaw is a use-after-free on page structures; the known exploit leverages the refcount underflow to obtain stale read access to freed physical pages and extract kernel PTE contents, enabling arbitrary memory disclosure primitives.\nI:H - UAF page refcount corruption enables crafting writable PTE entries against read-only page-cache pages; the public exploit demonstrates integrity compromise by rewriting /etc/passwd and obtaining root via su.\nA:H - Use-after-free of page structures can cause kernel oops/panic during skb teardown; even failed exploitation attempts can crash the system."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:31:18.394Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8d"
        },
        {
          "url": "https://git.kernel.org/stable/c/1f9c828556416fbe3f49386708ce999fc4d4da06"
        },
        {
          "url": "https://git.kernel.org/stable/c/479084ae0e1d9cb7929cb4298d35623de189f80a"
        },
        {
          "url": "https://git.kernel.org/stable/c/e334cbf3388fd9334503a778a82d9e9f14dd2f71"
        },
        {
          "url": "https://git.kernel.org/stable/c/44bea2032af0425e4ce6d26a8af0ede79db49ec1"
        },
        {
          "url": "https://git.kernel.org/stable/c/4db79a322db8c97f7b73b8a347395ef4d685eb40"
        }
      ],
      "title": "net: gro: don\u0027t merge zcopy skbs",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46323",
    "datePublished": "2026-06-09T12:11:15.562Z",
    "dateReserved": "2026-05-13T15:03:33.112Z",
    "dateUpdated": "2026-08-25T12:05:36.169Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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