CVE-2026-64011 (GCVE-0-2026-64011)
Vulnerability from cvelistv5
Published
2026-07-19 14:56
Modified
2026-08-05 12:38
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: nfc: llcp: Fix use-after-free in llcp_sock_release() llcp_sock_release() unconditionally unlinks the socket from the local sockets list. However, if the socket is still in connecting state, it is on the connecting list. Fix this by checking the socket state and unlinking from the correct list.
References
Impacted products
Vendor Product Version
Linux Linux Version: b4011239a08e7e6c2c6e970dfa9e8ecb73139261
Version: b4011239a08e7e6c2c6e970dfa9e8ecb73139261
Version: b4011239a08e7e6c2c6e970dfa9e8ecb73139261
Version: b4011239a08e7e6c2c6e970dfa9e8ecb73139261
Version: b4011239a08e7e6c2c6e970dfa9e8ecb73139261
Version: b4011239a08e7e6c2c6e970dfa9e8ecb73139261
Version: b4011239a08e7e6c2c6e970dfa9e8ecb73139261
Version: b4011239a08e7e6c2c6e970dfa9e8ecb73139261
Version: da989ee1c7702050741a551df6866cc1588f277b
Version: 3.10.10   ≤
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/nfc/llcp_sock.c"
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        {
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          "product": "Linux",
          "programFiles": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "6.1.176",
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              "version": "6.12.93",
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              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
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          ]
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: Fix use-after-free in llcp_sock_release()\n\nllcp_sock_release() unconditionally unlinks the socket from the local\nsockets list.  However, if the socket is still in connecting state, it\nis on the connecting list.\n\nFix this by checking the socket state and unlinking from the correct list."
        }
      ],
      "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 bug is triggered in llcp_sock_release() via the local close(2) syscall on an AF_NFC LLCP socket left in LLCP_CONNECTING after a non-blocking connect(); no remote network protocol reaches this unlink path directly.\nAC:L - An attacker fully controls the race by opening an LLCP socket, calling connect() with O_NONBLOCK, and immediately closing it; no privileged setup or uncontrollable memory-layout conditions are required beyond an active NFC DEP link.\nPR:L - SOCK_STREAM/SOCK_DGRAM LLCP sockets require no capability checks at creation or release (only SOCK_RAW needs CAP_NET_RAW), so any unprivileged local process in init_net can reach the vulnerable close() path once an NFC DEP session is up.\nUI:N - Exploitation requires only programmatic socket connect/close calls from a malicious local process; no victim user action (such as tapping, mounting, or opening a file) is needed at exploit time if an NFC link is already established.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security boundary and can lead to local privilege escalation, not a cross-boundary escape such as VM or sandbox breakout.\nC:H - This is a kernel heap use-after-free of struct nfc_llcp_sock; freed socket objects can be reallocated and read through subsequent list lookups or concurrent recv_cc()/recv_dm() processing, enabling arbitrary kernel memory disclosure.\nI:H - A use-after-free on a socket structure embedded in struct sock provides standard kernel heap-spray primitives that can be leveraged for arbitrary write and local privilege escalation via control-flow hijacking.\nA:H - The use-after-free can cause immediate kernel oops/panic during concurrent list traversal or socket teardown, and successful exploitation yields full kernel compromise with total system unavailability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:38:11.263Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/89ba026747019ee643d29407435ddc118e6ca908"
        },
        {
          "url": "https://git.kernel.org/stable/c/fb29f6bbe433f3decad227588809636c25f2a287"
        },
        {
          "url": "https://git.kernel.org/stable/c/2dfdaaf7d933b676124aadec6698825e95f94fe9"
        },
        {
          "url": "https://git.kernel.org/stable/c/e00f50f8697724a6f1d2d35744c1332c9912dac5"
        },
        {
          "url": "https://git.kernel.org/stable/c/cdc17e09a636c7f936f771902535a7515a7608fc"
        },
        {
          "url": "https://git.kernel.org/stable/c/912ebc49d4406a17fe73e5671d674fbc2f6b2634"
        },
        {
          "url": "https://git.kernel.org/stable/c/bc421d0826dedbba37580a25405eafb599e76d42"
        },
        {
          "url": "https://git.kernel.org/stable/c/f4268b466190dae95a7585f69b4f1f8ad097632c"
        }
      ],
      "title": "nfc: llcp: Fix use-after-free in llcp_sock_release()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64011",
    "datePublished": "2026-07-19T14:56:25.901Z",
    "dateReserved": "2026-07-19T07:54:57.027Z",
    "dateUpdated": "2026-08-05T12:38:11.263Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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