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CVE-2026-64011 (GCVE-0-2026-64011)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:56 – Updated: 2026-08-05 12:38
VLAI
Title
nfc: llcp: Fix use-after-free in llcp_sock_release()
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b4011239a08e7e6c2c6e970dfa9e8ecb73139261 , < 89ba026747019ee643d29407435ddc118e6ca908 (git)
Affected: b4011239a08e7e6c2c6e970dfa9e8ecb73139261 , < fb29f6bbe433f3decad227588809636c25f2a287 (git)
Affected: b4011239a08e7e6c2c6e970dfa9e8ecb73139261 , < 2dfdaaf7d933b676124aadec6698825e95f94fe9 (git)
Affected: b4011239a08e7e6c2c6e970dfa9e8ecb73139261 , < e00f50f8697724a6f1d2d35744c1332c9912dac5 (git)
Affected: b4011239a08e7e6c2c6e970dfa9e8ecb73139261 , < cdc17e09a636c7f936f771902535a7515a7608fc (git)
Affected: b4011239a08e7e6c2c6e970dfa9e8ecb73139261 , < 912ebc49d4406a17fe73e5671d674fbc2f6b2634 (git)
Affected: b4011239a08e7e6c2c6e970dfa9e8ecb73139261 , < bc421d0826dedbba37580a25405eafb599e76d42 (git)
Affected: b4011239a08e7e6c2c6e970dfa9e8ecb73139261 , < f4268b466190dae95a7585f69b4f1f8ad097632c (git)
Affected: da989ee1c7702050741a551df6866cc1588f277b (git)
Affected: 3.10.10 , < 3.11 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 3.11
Unaffected: 0 , < 3.11 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.93 , ≤ 6.12.* (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.12 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "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."
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            "version": "3.1"
          },
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              "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."
            }
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        }
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        "dateUpdated": "2026-08-05T12:38:11.263Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/89ba026747019ee643d29407435ddc118e6ca908"
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          "url": "https://git.kernel.org/stable/c/fb29f6bbe433f3decad227588809636c25f2a287"
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    "state": "PUBLISHED"
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/nfc/llcp_sock.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"b4011239a08e7e6c2c6e970dfa9e8ecb73139261\",\"lessThan\":\"89ba026747019ee643d29407435ddc118e6ca908\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b4011239a08e7e6c2c6e970dfa9e8ecb73139261\",\"lessThan\":\"fb29f6bbe433f3decad227588809636c25f2a287\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b4011239a08e7e6c2c6e970dfa9e8ecb73139261\",\"lessThan\":\"2dfdaaf7d933b676124aadec6698825e95f94fe9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b4011239a08e7e6c2c6e970dfa9e8ecb73139261\",\"lessThan\":\"e00f50f8697724a6f1d2d35744c1332c9912dac5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b4011239a08e7e6c2c6e970dfa9e8ecb73139261\",\"lessThan\":\"cdc17e09a636c7f936f771902535a7515a7608fc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b4011239a08e7e6c2c6e970dfa9e8ecb73139261\",\"lessThan\":\"912ebc49d4406a17fe73e5671d674fbc2f6b2634\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b4011239a08e7e6c2c6e970dfa9e8ecb73139261\",\"lessThan\":\"bc421d0826dedbba37580a25405eafb599e76d42\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b4011239a08e7e6c2c6e970dfa9e8ecb73139261\",\"lessThan\":\"f4268b466190dae95a7585f69b4f1f8ad097632c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"da989ee1c7702050741a551df6866cc1588f277b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3.10.10\",\"lessThan\":\"3.11\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/nfc/llcp_sock.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.11\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.259\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.93\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.35\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.12\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2dfdaaf7d933b676124aadec6698825e95f94fe9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/89ba026747019ee643d29407435ddc118e6ca908\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/912ebc49d4406a17fe73e5671d674fbc2f6b2634\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bc421d0826dedbba37580a25405eafb599e76d42\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cdc17e09a636c7f936f771902535a7515a7608fc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e00f50f8697724a6f1d2d35744c1332c9912dac5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f4268b466190dae95a7585f69b4f1f8ad097632c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fb29f6bbe433f3decad227588809636c25f2a287\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T14:20:28+00:00",
      "cve": "CVE-2026-64011",
      "id": "CVE-2026-64011",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nfc: llcp: Fix use-after-free in llcp_sock_release()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64011.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.