CVE-2023-53020 (GCVE-0-2023-53020)
Vulnerability from cvelistv5
Published
2025-03-27 16:43
Modified
2025-05-04 07:47
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: l2tp: close all race conditions in l2tp_tunnel_register() The code in l2tp_tunnel_register() is racy in several ways: 1. It modifies the tunnel socket _after_ publishing it. 2. It calls setup_udp_tunnel_sock() on an existing socket without locking. 3. It changes sock lock class on fly, which triggers many syzbot reports. This patch amends all of them by moving socket initialization code before publishing and under sock lock. As suggested by Jakub, the l2tp lockdep class is not necessary as we can just switch to bh_lock_sock_nested().
References
Impacted products
Vendor Product Version
Linux Linux Version: 37159ef2c1ae1e696b24b260b241209a19f92c60
Version: 37159ef2c1ae1e696b24b260b241209a19f92c60
Version: 37159ef2c1ae1e696b24b260b241209a19f92c60
Version: 37159ef2c1ae1e696b24b260b241209a19f92c60
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/l2tp/l2tp_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2d77e5c0ad79004b5ef901895437e9cce6dfcc7e",
              "status": "affected",
              "version": "37159ef2c1ae1e696b24b260b241209a19f92c60",
              "versionType": "git"
            },
            {
              "lessThan": "77e8ed776cdb1a24b2aab8fe7c6f1f154235e1ce",
              "status": "affected",
              "version": "37159ef2c1ae1e696b24b260b241209a19f92c60",
              "versionType": "git"
            },
            {
              "lessThan": "cef0845b6dcfa2f6c2c832e7f9622551456c741d",
              "status": "affected",
              "version": "37159ef2c1ae1e696b24b260b241209a19f92c60",
              "versionType": "git"
            },
            {
              "lessThan": "0b2c59720e65885a394a017d0cf9cab118914682",
              "status": "affected",
              "version": "37159ef2c1ae1e696b24b260b241209a19f92c60",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/l2tp/l2tp_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.6"
            },
            {
              "lessThan": "3.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.166",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.91",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.166",
                  "versionStartIncluding": "3.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.91",
                  "versionStartIncluding": "3.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.9",
                  "versionStartIncluding": "3.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2",
                  "versionStartIncluding": "3.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nl2tp: close all race conditions in l2tp_tunnel_register()\n\nThe code in l2tp_tunnel_register() is racy in several ways:\n\n1. It modifies the tunnel socket _after_ publishing it.\n\n2. It calls setup_udp_tunnel_sock() on an existing socket without\n   locking.\n\n3. It changes sock lock class on fly, which triggers many syzbot\n   reports.\n\nThis patch amends all of them by moving socket initialization code\nbefore publishing and under sock lock. As suggested by Jakub, the\nl2tp lockdep class is not necessary as we can just switch to\nbh_lock_sock_nested()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:47:49.986Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2d77e5c0ad79004b5ef901895437e9cce6dfcc7e"
        },
        {
          "url": "https://git.kernel.org/stable/c/77e8ed776cdb1a24b2aab8fe7c6f1f154235e1ce"
        },
        {
          "url": "https://git.kernel.org/stable/c/cef0845b6dcfa2f6c2c832e7f9622551456c741d"
        },
        {
          "url": "https://git.kernel.org/stable/c/0b2c59720e65885a394a017d0cf9cab118914682"
        }
      ],
      "title": "l2tp: close all race conditions in l2tp_tunnel_register()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53020",
    "datePublished": "2025-03-27T16:43:47.151Z",
    "dateReserved": "2025-03-27T16:40:15.752Z",
    "dateUpdated": "2025-05-04T07:47:49.986Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53020\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-03-27T17:15:51.457\",\"lastModified\":\"2025-04-15T19:41:50.600\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nl2tp: close all race conditions in l2tp_tunnel_register()\\n\\nThe code in l2tp_tunnel_register() is racy in several ways:\\n\\n1. It modifies the tunnel socket _after_ publishing it.\\n\\n2. It calls setup_udp_tunnel_sock() on an existing socket without\\n   locking.\\n\\n3. It changes sock lock class on fly, which triggers many syzbot\\n   reports.\\n\\nThis patch amends all of them by moving socket initialization code\\nbefore publishing and under sock lock. As suggested by Jakub, the\\nl2tp lockdep class is not necessary as we can just switch to\\nbh_lock_sock_nested().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: l2tp: cierra todas las condiciones de ejecuci\u00f3n en l2tp_tunnel_register() El c\u00f3digo en l2tp_tunnel_register() es de alto riesgo de varias maneras: 1. Modifica el socket _after_ publishing it. 2. Llama a setup_udp_tunnel_sock() en un socket existente sin bloquearlo. 3. Cambia la clase de bloqueo de sock sobre la marcha, lo que activa muchos informes de syzbot. Este parche las enmienda todas moviendo el c\u00f3digo de inicializaci\u00f3n del socket antes de publicarlo y bajo el bloqueo de sock. Como sugiri\u00f3 Jakub, la clase l2tp lockdep no es necesaria ya que podemos simplemente cambiar a bh_lock_sock_nested().\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":4.7,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.0,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-362\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.6\",\"versionEndExcluding\":\"5.10.166\",\"matchCriteriaId\":\"F62E4A98-1B6C-4EA7-A272-DC5FBC68C570\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.91\",\"matchCriteriaId\":\"91C2E92D-CC25-4FBD-8824-56A148119D7E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.9\",\"matchCriteriaId\":\"ED5B6045-B1D2-4E03-B194-9005A351BCAE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.2:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"FF501633-2F44-4913-A8EE-B021929F49F6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.2:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"2BDA597B-CAC1-4DF0-86F0-42E142C654E9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.2:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"725C78C9-12CE-406F-ABE8-0813A01D66E8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.2:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"A127C155-689C-4F67-B146-44A57F4BFD85\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0b2c59720e65885a394a017d0cf9cab118914682\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2d77e5c0ad79004b5ef901895437e9cce6dfcc7e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/77e8ed776cdb1a24b2aab8fe7c6f1f154235e1ce\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/cef0845b6dcfa2f6c2c832e7f9622551456c741d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.