CVE-2026-90223 (GCVE-0-2026-90223)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:07 – Updated: 2026-09-18 17:53
VLAI
Title
nfc: llcp: bound SNL TLV parsing to the skb and add length checks
Summary
In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: bound SNL TLV parsing to the skb and add length checks nfc_llcp_recv_snl() walked the SNL TLV list using a u16 offset/length pair derived from skb->len, without bounding reads to the actual skb data. Three problems followed: - For a short frame (skb->len < LLCP_HEADER_SIZE), tlv_len underflowed. - The per-TLV header (type, length) was read without checking that two bytes remained. - A declared TLV length could run past the end of the buffer, and an SDREQ with length == 0 made "service_name_len = length - 1" underflow (size_t), driving an out-of-bounds read in the following strncmp() / nfc_llcp_sock_from_sn(). The SDRES case likewise read tlv[2]/tlv[3] without a length check. A nearby NFC device can reach this without authentication; LLCP link activation happens automatically after NFC-DEP. Walk the TLV list by pointer, bounded by skb_tail_pointer() over the linear skb data, and validate each TLV declared length before use. Add explicit length checks for SDREQ (>= 1) and SDRES (exactly 2). Found by 0sec automated security-research tooling (https://0sec.ai).
Severity
7.1 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 19cfe5843e86cc95542d9d875c9386e197956d75 , < 88b36d36e12c9ba76decdb580d9c1907c084e587 (git)
Affected: 19cfe5843e86cc95542d9d875c9386e197956d75 , < 587fc2a5a35b41883b22b8f808fe5d345208914b (git)
Affected: 19cfe5843e86cc95542d9d875c9386e197956d75 , < f04ac9bf2379f3e2470c400c235eb12f74891bef (git)
Affected: 19cfe5843e86cc95542d9d875c9386e197956d75 , < 02030f95820c42431280f4f945ff34247fb840ff (git)
Affected: 19cfe5843e86cc95542d9d875c9386e197956d75 , < 99fdb5c2522f365efa199d0117b641e35097041e (git)
Affected: 19cfe5843e86cc95542d9d875c9386e197956d75 , < 749a9048bf51a668ec3ab6c0392ba32325607281 (git)
Affected: 19cfe5843e86cc95542d9d875c9386e197956d75 , < eeb16fb24cfe67947b832fd9ada5f488afc72579 (git)
Affected: 19cfe5843e86cc95542d9d875c9386e197956d75 , < f4c7f37f0ab990952539dc68d931d65c3657600a (git)
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Linux Linux Affected: 3.8
Unaffected: 0 , < 3.8 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: bound SNL TLV parsing to the skb and add length checks\n\nnfc_llcp_recv_snl() walked the SNL TLV list using a u16 offset/length\npair derived from skb-\u003elen, without bounding reads to the actual skb\ndata. Three problems followed:\n\n  - For a short frame (skb-\u003elen \u003c LLCP_HEADER_SIZE), tlv_len underflowed.\n  - The per-TLV header (type, length) was read without checking that two\n    bytes remained.\n  - A declared TLV length could run past the end of the buffer, and an\n    SDREQ with length == 0 made \"service_name_len = length - 1\" underflow\n    (size_t), driving an out-of-bounds read in the following strncmp() /\n    nfc_llcp_sock_from_sn(). The SDRES case likewise read tlv[2]/tlv[3]\n    without a length check.\n\nA nearby NFC device can reach this without authentication; LLCP link\nactivation happens automatically after NFC-DEP.\n\nWalk the TLV list by pointer, bounded by skb_tail_pointer() over the\nlinear skb data, and validate each TLV declared length before use. Add\nexplicit length checks for SDREQ (\u003e= 1) and SDRES (exactly 2).\n\nFound by 0sec automated security-research tooling (https://0sec.ai)."
        }
      ],
      "metrics": [
        {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
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              "lang": "en",
              "value": "AV:A - A nearby NFC-DEP peer supplies the malformed bytes in an LLCP SNL PDU (ptype LLCP_PDU_SNL, DSAP/SSAP LLCP_SAP_SDP). nfc_tm_data_received() or the initiator nfc_llcp_recv() callback delivers that skb through __nfc_llcp_recv() and nfc_llcp_rx_skb() into nfc_llcp_recv_snl(), which walks attacker-controlled SDREQ/SDRES TLVs. NFC is radio-range, so Adjacent.\nAC:L - The attacker fully controls the SNL payload, including each TLV type and u8 length. An SDREQ with length 0 or 15, or a declared length past the remaining skb, hits the missing header/value checks in nfc_llcp_recv_snl() deterministically, with no race or heap layout the attacker cannot set.\nPR:N - nfc_llcp_recv_snl() only rejects PDUs whose DSAP/SSAP are not LLCP_SAP_SDP; it does not require LLCP CONNECT, SDP credentials, or any host account. After nfc_dep_link_is_up(), an unauthenticated NFC-DEP peer can send SNL immediately.\nUI:N - nfc_tm_activated() calls nfc_dep_link_is_up() automatically when protocol is NFC_PROTO_NFC_DEP_MASK, after which nfc_tm_data_received() hands DEP payloads to LLCP. The attacker triggers the SNL parse with their own frames; no extra victim click, mount, or dialog is required.\nS:U - nfc_llcp_recv_snl() over-reads kernel memory adjacent to the received skb in the LLCP receive path. That stays inside the host kernel\u0027s security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:L - A short SDREQ with length==15 makes strncmp(service_name, \"urn:nfc:sn:sdp\", 14) read up to 14 bytes past the skb, and length==0 uses out-of-bounds tlv[2] as the tid echoed by nfc_llcp_build_sdres_tlv(). nfc_llcp_sock_from_sn() memcmp is gated on matching socket name length, so this is a small bounded leak, not an arbitrary read.\nI:N - The SNL walker only reads past the skb; it does not write past it. The SDRES path assigns tlv[3] into an existing pending nfc_llcp_sdp_tlv-\u003esap on a tid match, which is an in-object protocol field a well-formed SDRES can already set, not a kernel write primitive.\nA:H - nfc_llcp_recv_snl() can read tlv[0]/tlv[1] when fewer than two bytes remain, and strncmp()/tlv[2] past the skb tail. Those over-reads can fault on an unmapped page or KFENCE guard and oops the kernel."
            }
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        "dateUpdated": "2026-09-18T17:53:49.876Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/f4c7f37f0ab990952539dc68d931d65c3657600a"
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      ],
      "title": "nfc: llcp: bound SNL TLV parsing to the skb and add length checks",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90223",
    "datePublished": "2026-09-17T16:07:33.355Z",
    "dateReserved": "2026-09-11T19:38:34.794Z",
    "dateUpdated": "2026-09-18T17:53:49.876Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
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      "date": "2026-09-25",
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      "percentile": "0.37892"
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      "cve": {
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        "descriptions": [
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: bound SNL TLV parsing to the skb and add length checks\n\nnfc_llcp_recv_snl() walked the SNL TLV list using a u16 offset/length\npair derived from skb-\u003elen, without bounding reads to the actual skb\ndata. Three problems followed:\n\n  - For a short frame (skb-\u003elen \u003c LLCP_HEADER_SIZE), tlv_len underflowed.\n  - The per-TLV header (type, length) was read without checking that two\n    bytes remained.\n  - A declared TLV length could run past the end of the buffer, and an\n    SDREQ with length == 0 made \"service_name_len = length - 1\" underflow\n    (size_t), driving an out-of-bounds read in the following strncmp() /\n    nfc_llcp_sock_from_sn(). The SDRES case likewise read tlv[2]/tlv[3]\n    without a length check.\n\nA nearby NFC device can reach this without authentication; LLCP link\nactivation happens automatically after NFC-DEP.\n\nWalk the TLV list by pointer, bounded by skb_tail_pointer() over the\nlinear skb data, and validate each TLV declared length before use. Add\nexplicit length checks for SDREQ (\u003e= 1) and SDRES (exactly 2).\n\nFound by 0sec automated security-research tooling (https://0sec.ai)."
          }
        ],
        "id": "CVE-2026-90223",
        "lastModified": "2026-09-18T18:17:46.967",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "ADJACENT_NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.1,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "LOW",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.8,
              "impactScore": 4.2,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-09-17T17:17:17.850",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/02030f95820c42431280f4f945ff34247fb840ff"
          },
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/88b36d36e12c9ba76decdb580d9c1907c084e587"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/99fdb5c2522f365efa199d0117b641e35097041e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/eeb16fb24cfe67947b832fd9ada5f488afc72579"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f04ac9bf2379f3e2470c400c235eb12f74891bef"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f4c7f37f0ab990952539dc68d931d65c3657600a"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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Tags
Taxonomy of the tags.





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

Author Source Type Date Other

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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.