CVE-2026-99059

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: wireguard: noise: reject response consumption after intermediate initiation Two threads begin processing the identical response message, received twice. The first thread, A, runs. While it's running, the second one, B, gets partway through, and during that slow calculation, or even while blocking on down_write(), A completes and then also a handshake initiation that's already been queued up runs in thread C, which itself takes that same down_write(). The handshake initiation creation succeeds, and sets the state back to waiting-for-response, and calls up_write(), at which point thread B resumes, because either its finished its calculations or was finally allowed to acquire down_write(). Thread B then copies the state back to the peer, and begins a new session, using that state, which is the same session as the one made in thread A. Thread A Thread B Thread C down_read() sA = handshake->state memcpy(cA, handshake->crypto) up_read() if (sA != 1) goto fail slow_crypto(cA) down_read() sB = handshake->state memcpy(cB, handshake->crypto) up_read() if (sB != 1) goto fail slow_crypto(cB) down_write() if (sA != handshake->state) goto fail memcpy(handshake->crypto, cA) handshake->state = 2 up_write() down_write() if (handshake->state != 2) goto fail derive_session(handshake->crypto) up_write() down_write() slow_crypto(handshake->crypto) handshake->state = 1 up_write() down_write() if (sB != handshake->state) goto fail memcpy(handshake->crypto, cB) handshake->state = 2 up_write() down_write() if (handshake->state != 2) goto fail derive_session(handshake->crypto) up_write() This seems basically impossible to hit in a meaningful way in practice, but ensure that it absolutely cannot happen by comparing the ephemeral private key that's on the stack with the latest one that the peer's handshake state has.

Severity

HIGH

CVSS score

7.7 (v3.1)

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-10-23 13:17:29.620000

Last modified

2026-10-30 13:21:42.723000

View original CVE JSON

{
  "id": "CVE-2026-99059",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-10-23T13:17:29.620",
  "lastModified": "2026-10-30T13:21:42.723",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwireguard: noise: reject response consumption after intermediate initiation\n\nTwo threads begin processing the identical response message, received\ntwice. The first thread, A, runs. While it's running, the second one,\nB, gets partway through, and during that slow calculation, or even while\nblocking on down_write(), A completes and then also a handshake\ninitiation that's already been queued up runs in thread C, which itself\ntakes that same down_write(). The handshake initiation creation\nsucceeds, and sets the state back to waiting-for-response, and calls\nup_write(), at which point thread B resumes, because either its finished\nits calculations or was finally allowed to acquire down_write(). Thread\nB then copies the state back to the peer, and begins a new session,\nusing that state, which is the same session as the one made in thread A.\n\nThread A\t\t\tThread B\t\t\tThread C\n\ndown_read()\n sA = handshake->state\n memcpy(cA, handshake->crypto)\nup_read()\nif (sA != 1)\n goto fail\nslow_crypto(cA)\n\t\t\t\tdown_read()\n\t\t\t\t sB = handshake->state\n\t\t\t\t memcpy(cB, handshake->crypto)\n\t\t\t\tup_read()\n\t\t\t\tif (sB != 1)\n\t\t\t\t goto fail\n\t\t\t\tslow_crypto(cB)\ndown_write()\n if (sA != handshake->state)\n  goto fail\n memcpy(handshake->crypto, cA)\n handshake->state = 2\nup_write()\ndown_write()\n if (handshake->state != 2)\n  goto fail\n derive_session(handshake->crypto)\nup_write()\n\t\t\t\t\t\t\t\tdown_write()\n\t\t\t\t\t\t\t\t slow_crypto(handshake->crypto)\n\t\t\t\t\t\t\t\t handshake->state = 1\n\t\t\t\t\t\t\t\tup_write()\n\t\t\t\tdown_write()\n\t\t\t\t if (sB != handshake->state)\n\t\t\t\t   goto fail\n\t\t\t\t memcpy(handshake->crypto, cB)\n\t\t\t\t handshake->state = 2\n\t\t\t\tup_write()\n\t\t\t\tdown_write()\n\t\t\t\t if (handshake->state != 2)\n\t\t\t\t  goto fail\n\t\t\t\t derive_session(handshake->crypto)\n\t\t\t\tup_write()\n\nThis seems basically impossible to hit in a meaningful way in practice,\nbut ensure that it absolutely cannot happen by comparing the ephemeral\nprivate key that's on the stack with the latest one that the peer's\nhandshake state has."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/net/wireguard/noise.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "e7096c131e5161fa3b8e52a650d7719d2857adfd",
              "lessThan": "dbd1e21f4301bd2157cd771255f1ca6ba1c8a1f9",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "e7096c131e5161fa3b8e52a650d7719d2857adfd",
              "lessThan": "f4012ec25a4abb6a23dc40043f61e2d9a7deca6d",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "e7096c131e5161fa3b8e52a650d7719d2857adfd",
              "lessThan": "6b5b14cb5421e84191e3f6b5a7566783a402ff7f",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "e7096c131e5161fa3b8e52a650d7719d2857adfd",
              "lessThan": "fb5ce4c7790c3eeec820302d08d70ecf46af4295",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "e7096c131e5161fa3b8e52a650d7719d2857adfd",
              "lessThan": "c76a80db593096edf2b3b3972f58b6342a8c6c04",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "e7096c131e5161fa3b8e52a650d7719d2857adfd",
              "lessThan": "4d64a3d6e96aa78619c9c29ffde309794974588a",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "e7096c131e5161fa3b8e52a650d7719d2857adfd",
              "lessThan": "3bec3d32c2a3afd164fc87f95457df2cf9049c20",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "e7096c131e5161fa3b8e52a650d7719d2857adfd",
              "lessThan": "d0305f8d90029556260c6824b61c493c424eba9e",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/net/wireguard/noise.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "5.6",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "5.6",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.10.273",
              "lessThanOrEqual": "5.10.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.15.224",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.191",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.160",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.113",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.57",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.11",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "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:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
          "baseScore": 7.7,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "HIGH",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "LOW"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 5.5
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/3bec3d32c2a3afd164fc87f95457df2cf9049c20",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4d64a3d6e96aa78619c9c29ffde309794974588a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6b5b14cb5421e84191e3f6b5a7566783a402ff7f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c76a80db593096edf2b3b3972f58b6342a8c6c04",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d0305f8d90029556260c6824b61c493c424eba9e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/dbd1e21f4301bd2157cd771255f1ca6ba1c8a1f9",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f4012ec25a4abb6a23dc40043f61e2d9a7deca6d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fb5ce4c7790c3eeec820302d08d70ecf46af4295",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}