CVE-2026-90225 (GCVE-0-2026-90225)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:07 – Updated: 2026-10-19 09:00
VLAI
Title
nfc: llcp: read llcp_sock->local under the socket lock in getsockopt
Summary
In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: read llcp_sock->local under the socket lock in getsockopt nfc_llcp_getsockopt() read llcp_sock->local before lock_sock(sk) and then dereferenced the cached pointer inside the locked region. llcp_sock_bind() assigns and clears llcp_sock->local under the same socket lock, dropping the last reference on its error path. A getsockopt() racing an in-flight bind() can observe the pointer, block on lock_sock(), and then dereference a freed nfc_llcp_local once bind() has unwound. Move the llcp_sock->local read and the NULL check inside the lock_sock(sk) region so bind() cannot mutate or free the pointer between the load and the use.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 , < 56fd158fef20268f48db6cdfe5d722e930134eda (git)
Affected: 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 , < 8ba8cec0586727cc135ca4827921fc7b52946d71 (git)
Affected: 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 , < ed5240bab3468988077fe8bf29b935eaecc9ff89 (git)
Affected: 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 , < fe65727a4a21b11c18eebae1338482767a897b76 (git)
Affected: 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 , < 2d8ac24565be85bf56580b87bf1b874d35625eb5 (git)
Affected: 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 , < 156e65bd29307f5053835bff60bc1ba342fa010f (git)
Affected: 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 , < d1b73962675cdc5a58e2707e25b548d8b495fde0 (git)
Affected: 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 , < 36812527052c5bfb1ec6c1e292d67a5bf76b750f (git)
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Linux Linux Affected: 3.10
Unaffected: 0 , < 3.10 (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 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/nfc/llcp_sock.c"
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: read llcp_sock-\u003elocal under the socket lock in getsockopt\n\nnfc_llcp_getsockopt() read llcp_sock-\u003elocal before lock_sock(sk) and\nthen dereferenced the cached pointer inside the locked region.\nllcp_sock_bind() assigns and clears llcp_sock-\u003elocal under the same\nsocket lock, dropping the last reference on its error path. A\ngetsockopt() racing an in-flight bind() can observe the pointer, block\non lock_sock(), and then dereference a freed nfc_llcp_local once bind()\nhas unwound.\n\nMove the llcp_sock-\u003elocal read and the NULL check inside the\nlock_sock(sk) region so bind() cannot mutate or free the pointer between\nthe load and the use."
        }
      ],
      "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 UAF is triggered by racing local syscalls on an AF_NFC LLCP socket: getsockopt(2) (__sys_getsockopt \u2192 do_sock_getsockopt \u2192 nfc_llcp_getsockopt) against bind(2) (__sys_bind \u2192 llcp_sock_bind). No LLCP PDU or other NFC-peer bytes are consumed on this path, so an adjacent radio peer cannot drive it.\nAC:L - The attacker owns both sides of the lock_sock(sk) race: one thread calls bind() with service_name_len 0 so nfc_llcp_get_sdp_ssap() returns LLCP_SAP_MAX after llcp_sock-\u003elocal is stored, and another calls getsockopt(SOL_NFC, NFC_LLCP_RW) on the same socket, which used to snapshot that pointer before taking the lock.\nPR:L - llcp_sock_create() checks capable(CAP_NET_RAW) only for SOCK_RAW; nfc_llcp_getsockopt is on llcp_sock_ops for SOCK_STREAM/DGRAM. An unprivileged user in init_net can socket(AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP) then bind/getsockopt. nfc_llcp_find_local() needs a registered NFC device, which is typical on phones.\nUI:N - The attacker creates the AF_NFC LLCP socket and issues bind() and getsockopt() on that fd themselves; no other user needs to tap a tag, mount media, or accept a connection.\nS:U - The freed object is the host kernel\u0027s kmalloc\u0027d nfc_llcp_local used by nfc_llcp_getsockopt(); impact stays inside the kernel\u0027s security authority, not a VM, IOMMU, or sandbox escape.\nC:H - nfc_llcp_getsockopt() dereferences the dangling nfc_llcp_local to read local-\u003erw, local-\u003emiux, local-\u003eremote_miu, and local-\u003eremote_lto and copies those values to userspace with put_user(), so reclaim of the freed slab yields an arbitrary-read primitive.\nI:H - llcp_sock_bind()\u0027s sock_llcp_put_local path drops nfc_llcp_local via nfc_llcp_local_put() while nfc_llcp_getsockopt() still holds the pointer; reclaiming that kmalloc object with attacker-controlled data turns the dangling local into a write/control-flow primitive.\nA:H - Using the freed nfc_llcp_local in nfc_llcp_getsockopt() (the local-\u003erw and local-\u003eremote_lto loads) is a kernel slab UAF that oopses or panics on KASAN/SLUB_DEBUG and can crash the system even when not fully exploited."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:00:01.803Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/56fd158fef20268f48db6cdfe5d722e930134eda"
        },
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          "url": "https://git.kernel.org/stable/c/8ba8cec0586727cc135ca4827921fc7b52946d71"
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          "url": "https://git.kernel.org/stable/c/ed5240bab3468988077fe8bf29b935eaecc9ff89"
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        {
          "url": "https://git.kernel.org/stable/c/fe65727a4a21b11c18eebae1338482767a897b76"
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        },
        {
          "url": "https://git.kernel.org/stable/c/36812527052c5bfb1ec6c1e292d67a5bf76b750f"
        }
      ],
      "title": "nfc: llcp: read llcp_sock-\u003elocal under the socket lock in getsockopt",
      "x_generator": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90225",
    "datePublished": "2026-09-17T16:07:34.658Z",
    "dateReserved": "2026-09-11T19:38:34.794Z",
    "dateUpdated": "2026-10-19T09:00:01.803Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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      "date": "2026-11-04",
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      "percentile": "0.07138"
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                "programFiles": [
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                "vendor": "Linux",
                "versions": [
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                    "versionType": "original_commit_for_fix"
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: read llcp_sock-\u003elocal under the socket lock in getsockopt\n\nnfc_llcp_getsockopt() read llcp_sock-\u003elocal before lock_sock(sk) and\nthen dereferenced the cached pointer inside the locked region.\nllcp_sock_bind() assigns and clears llcp_sock-\u003elocal under the same\nsocket lock, dropping the last reference on its error path. A\ngetsockopt() racing an in-flight bind() can observe the pointer, block\non lock_sock(), and then dereference a freed nfc_llcp_local once bind()\nhas unwound.\n\nMove the llcp_sock-\u003elocal read and the NULL check inside the\nlock_sock(sk) region so bind() cannot mutate or free the pointer between\nthe load and the use."
          }
        ],
        "id": "CVE-2026-90225",
        "lastModified": "2026-10-19T09:19:12.790",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-09-17T17:17:18.133",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/156e65bd29307f5053835bff60bc1ba342fa010f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2d8ac24565be85bf56580b87bf1b874d35625eb5"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/36812527052c5bfb1ec6c1e292d67a5bf76b750f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/56fd158fef20268f48db6cdfe5d722e930134eda"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8ba8cec0586727cc135ca4827921fc7b52946d71"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d1b73962675cdc5a58e2707e25b548d8b495fde0"
          },
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          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-13T15:10:28+00:00",
      "cve": "CVE-2026-90225",
      "id": "CVE-2026-90225",
      "initial_release_date": "2026-09-17T00:00:00+00:00",
      "product_status:known_not_affected": "277",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nfc: llcp: read llcp_sock-\u003elocal under the socket lock in getsockopt",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90225.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-11-04T00:55:01Z",
      "cve": "CVE-2026-90225",
      "id": "CVE-2026-90225",
      "initial_release_date": "2026-09-18T00:19:38Z",
      "product_status:known_affected": "265",
      "product_status:known_not_affected": "0",
      "product_status:recommended": "69",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-90225",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-90225.json",
      "version": "8"
    }
  }
}



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Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    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.