Vulnerability-Lookup

FKIE_CVE-2025-37756

Vulnerability from fkie_nvd - Published: 2025-05-01 13:15 - Updated: 2026-07-30 06:22

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: net: tls: explicitly disallow disconnect syzbot discovered that it can disconnect a TLS socket and then run into all sort of unexpected corner cases. I have a vague recollection of Eric pointing this out to us a long time ago. Supporting disconnect is really hard, for one thing if offload is enabled we'd need to wait for all packets to be _acked_. Disconnect is not commonly used, disallow it. The immediate problem syzbot run into is the warning in the strp, but that's just the easiest bug to trigger: WARNING: CPU: 0 PID: 5834 at net/tls/tls_strp.c:486 tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486 RIP: 0010:tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486 Call Trace: <TASK> tls_rx_rec_wait+0x280/0xa60 net/tls/tls_sw.c:1363 tls_sw_recvmsg+0x85c/0x1c30 net/tls/tls_sw.c:2043 inet6_recvmsg+0x2c9/0x730 net/ipv6/af_inet6.c:678 sock_recvmsg_nosec net/socket.c:1023 [inline] sock_recvmsg+0x109/0x280 net/socket.c:1045 __sys_recvfrom+0x202/0x380 net/socket.c:2237

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2bcad8fefcecdd5f005d8c550b25d703c063c34a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5071a1e606b30c0c11278d3c6620cd6a24724cf6	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7bdcf5bc35ae59fc4a0fa23276e84b4d1534a3cf	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8513411ec321942bd3cfed53d5bb700665c67d86	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9fcbca0f801580cbb583e9cb274e2c7fbe766ca6	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ac91c6125468be720eafde9c973994cb45b61d44	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c665bef891e8972e1d3ce5bbc0d42a373346a2c3	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f3ce4d3f874ab7919edca364c147ac735f9f1d04	Patch
af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/05/07/1
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html	Mailing List
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html	Mailing List

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.15
debian	debian_linux	11.0

JSON

To clipboard

{
  "affected": [
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      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/tls/tls_main.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "4.13"
            },
            {
              "lessThan": "4.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.237",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.181",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.135",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.88",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.24",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.13.*",
              "status": "unaffected",
              "version": "6.13.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.14.*",
              "status": "unaffected",
              "version": "6.14.3",
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              "status": "unaffected",
              "version": "6.15",
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          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
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  "configurations": [
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tls: explicitly disallow disconnect\n\nsyzbot discovered that it can disconnect a TLS socket and then\nrun into all sort of unexpected corner cases. I have a vague\nrecollection of Eric pointing this out to us a long time ago.\nSupporting disconnect is really hard, for one thing if offload\nis enabled we\u0027d need to wait for all packets to be _acked_.\nDisconnect is not commonly used, disallow it.\n\nThe immediate problem syzbot run into is the warning in the strp,\nbut that\u0027s just the easiest bug to trigger:\n\n  WARNING: CPU: 0 PID: 5834 at net/tls/tls_strp.c:486 tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486\n  RIP: 0010:tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486\n  Call Trace:\n   \u003cTASK\u003e\n   tls_rx_rec_wait+0x280/0xa60 net/tls/tls_sw.c:1363\n   tls_sw_recvmsg+0x85c/0x1c30 net/tls/tls_sw.c:2043\n   inet6_recvmsg+0x2c9/0x730 net/ipv6/af_inet6.c:678\n   sock_recvmsg_nosec net/socket.c:1023 [inline]\n   sock_recvmsg+0x109/0x280 net/socket.c:1045\n   __sys_recvfrom+0x202/0x380 net/socket.c:2237"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: tls: expl\u00edcitamente deshabilitar la desconexi\u00f3n. syzbot descubri\u00f3 que puede desconectar un socket TLS y luego encontrarse con todo tipo de casos inesperados. Recuerdo vagamente que Eric nos lo se\u00f1al\u00f3 hace mucho tiempo. Admitir la desconexi\u00f3n es muy dif\u00edcil; por ejemplo, si la descarga est\u00e1 habilitada, tendr\u00edamos que esperar a que se ackearan todos los paquetes. La desconexi\u00f3n no se usa com\u00fanmente; deshabilitarla. El problema inmediato con el que se encuentra syzbot es la advertencia en el strp, pero ese es simplemente el error m\u00e1s f\u00e1cil de activar: ADVERTENCIA: CPU: 0 PID: 5834 en net/tls/tls_strp.c:486 tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486 RIP: 0010:tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486 Rastreo de llamada:  tls_rx_rec_wait+0x280/0xa60 net/tls/tls_sw.c:1363 tls_sw_recvmsg+0x85c/0x1c30 net/tls/tls_sw.c:2043 inet6_recvmsg+0x2c9/0x730 net/ipv6/af_inet6.c:678 sock_recvmsg_nosec net/socket.c:1023 [en l\u00ednea] sock_recvmsg+0x109/0x280 net/socket.c:1045 __sys_recvfrom+0x202/0x380 net/socket.c:2237"
    }
  ],
  "id": "CVE-2025-37756",
  "lastModified": "2026-07-30T06:22:19.233",
  "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"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-05-01T13:15:54.370",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
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      "url": "https://git.kernel.org/stable/c/2bcad8fefcecdd5f005d8c550b25d703c063c34a"
    },
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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    },
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    },
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    },
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    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.openwall.com/lists/oss-security/2026/05/07/1"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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    },
    {
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  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2025-37756 (GCVE-0-2025-37756)

Vulnerability from cvelistv5 – Published: 2025-05-01 12:56 – Updated: 2026-08-05 11:57

Title

net: tls: explicitly disallow disconnect

Summary

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 mitre root

References

11 references

URL	Tags
https://git.kernel.org/stable/c/7bdcf5bc35ae59fc4…
https://git.kernel.org/stable/c/ac91c6125468be720…
https://git.kernel.org/stable/c/f3ce4d3f874ab7919…
https://git.kernel.org/stable/c/2bcad8fefcecdd5f0…
https://git.kernel.org/stable/c/9fcbca0f801580cbb…
https://git.kernel.org/stable/c/c665bef891e8972e1…
https://git.kernel.org/stable/c/8513411ec321942bd…
https://git.kernel.org/stable/c/5071a1e606b30c0c1…
https://lists.debian.org/debian-lts-announce/2025…
https://lists.debian.org/debian-lts-announce/2025…
http://www.openwall.com/lists/oss-security/2026/05/07/1

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 , < 7bdcf5bc35ae59fc4a0fa23276e84b4d1534a3cf (git) Affected: 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 , < ac91c6125468be720eafde9c973994cb45b61d44 (git) Affected: 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 , < f3ce4d3f874ab7919edca364c147ac735f9f1d04 (git) Affected: 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 , < 2bcad8fefcecdd5f005d8c550b25d703c063c34a (git) Affected: 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 , < 9fcbca0f801580cbb583e9cb274e2c7fbe766ca6 (git) Affected: 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 , < c665bef891e8972e1d3ce5bbc0d42a373346a2c3 (git) Affected: 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 , < 8513411ec321942bd3cfed53d5bb700665c67d86 (git) Affected: 3c4d7559159bfe1e3b94df3a657b2cda3a34e218 , < 5071a1e606b30c0c11278d3c6620cd6a24724cf6 (git)
Linux	Linux	Affected: 4.13 Unaffected: 0 , < 4.13 (semver) Unaffected: 5.10.237 , ≤ 5.10.* (semver) Unaffected: 5.15.181 , ≤ 5.15.* (semver) Unaffected: 6.1.135 , ≤ 6.1.* (semver) Unaffected: 6.6.88 , ≤ 6.6.* (semver) Unaffected: 6.12.24 , ≤ 6.12.* (semver) Unaffected: 6.13.12 , ≤ 6.13.* (semver) Unaffected: 6.14.3 , ≤ 6.14.* (semver) Unaffected: 6.15 , ≤ * (original_commit_for_fix)

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JSON

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{
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        "providerMetadata": {
          "dateUpdated": "2026-05-07T06:58:56.863Z",
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          "shortName": "CVE"
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            "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"
          },
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/05/07/1"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/tls/tls_main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7bdcf5bc35ae59fc4a0fa23276e84b4d1534a3cf",
              "status": "affected",
              "version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218",
              "versionType": "git"
            },
            {
              "lessThan": "ac91c6125468be720eafde9c973994cb45b61d44",
              "status": "affected",
              "version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218",
              "versionType": "git"
            },
            {
              "lessThan": "f3ce4d3f874ab7919edca364c147ac735f9f1d04",
              "status": "affected",
              "version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218",
              "versionType": "git"
            },
            {
              "lessThan": "2bcad8fefcecdd5f005d8c550b25d703c063c34a",
              "status": "affected",
              "version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218",
              "versionType": "git"
            },
            {
              "lessThan": "9fcbca0f801580cbb583e9cb274e2c7fbe766ca6",
              "status": "affected",
              "version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218",
              "versionType": "git"
            },
            {
              "lessThan": "c665bef891e8972e1d3ce5bbc0d42a373346a2c3",
              "status": "affected",
              "version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218",
              "versionType": "git"
            },
            {
              "lessThan": "8513411ec321942bd3cfed53d5bb700665c67d86",
              "status": "affected",
              "version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218",
              "versionType": "git"
            },
            {
              "lessThan": "5071a1e606b30c0c11278d3c6620cd6a24724cf6",
              "status": "affected",
              "version": "3c4d7559159bfe1e3b94df3a657b2cda3a34e218",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/tls/tls_main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.13"
            },
            {
              "lessThan": "4.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.237",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.181",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.135",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.88",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.24",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.13.*",
              "status": "unaffected",
              "version": "6.13.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.14.*",
              "status": "unaffected",
              "version": "6.14.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.237",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.181",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.135",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.88",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.24",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13.12",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.14.3",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tls: explicitly disallow disconnect\n\nsyzbot discovered that it can disconnect a TLS socket and then\nrun into all sort of unexpected corner cases. I have a vague\nrecollection of Eric pointing this out to us a long time ago.\nSupporting disconnect is really hard, for one thing if offload\nis enabled we\u0027d need to wait for all packets to be _acked_.\nDisconnect is not commonly used, disallow it.\n\nThe immediate problem syzbot run into is the warning in the strp,\nbut that\u0027s just the easiest bug to trigger:\n\n  WARNING: CPU: 0 PID: 5834 at net/tls/tls_strp.c:486 tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486\n  RIP: 0010:tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486\n  Call Trace:\n   \u003cTASK\u003e\n   tls_rx_rec_wait+0x280/0xa60 net/tls/tls_sw.c:1363\n   tls_sw_recvmsg+0x85c/0x1c30 net/tls/tls_sw.c:2043\n   inet6_recvmsg+0x2c9/0x730 net/ipv6/af_inet6.c:678\n   sock_recvmsg_nosec net/socket.c:1023 [inline]\n   sock_recvmsg+0x109/0x280 net/socket.c:1045\n   __sys_recvfrom+0x202/0x380 net/socket.c:2237"
        }
      ],
      "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 vulnerability is triggered by the socket owner issuing `connect(fd, AF_UNSPEC)` followed by `recvmsg()` on their own kTLS socket; a remote TLS peer has no way to induce a disconnect. The TCP connection can be entirely loopback, so no network access is needed at all.\nAC:L - The sequence (attach TLS ULP, receive one record so the strparser latches `msg_ready` with a borrowed `frag_list`, disconnect, recvmsg) is fully under the attacker\u0027s control, single-threaded, and deterministic with no race to win. Heap grooming of the freed `skbuff_head` objects is standard and repeatable since the attacker can retry indefinitely.\nPR:L - `net/tls` contains no `capable()`/`ns_capable()` checks whatsoever, and `setsockopt(TCP_ULP,\"tls\")` plus `TLS_RX` crypto_info are available to any unprivileged user once the tls module is built in or resident. All steps are ordinary socket syscalls on a socket the attacker created.\nUI:N - The attacker performs every step themselves within a single process; no victim action, mount, or file open is involved.\nS:U - The corruption is confined to kernel memory managed by the same kernel security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - `skb_nsg()`/`skb_to_sgvec()` walk the anchor\u0027s dangling `frag_list` into freed `skbuff_head` slab objects, building a scatterlist from attacker-sprayable page pointers; the zero-copy AEAD then writes those kernel bytes into the user\u0027s buffer before the tag check fails, and since the attacker chose the RX key/IV they recover the plaintext \u2014 an arbitrary kernel memory read.\nI:H - This is a use-after-free: `tls_strp_msg_hold()` performs `skb_clone()` on freed skbs (refcount writes into reallocated slab memory) and queues clones that are later freed, giving heap corruption and arbitrary-free primitives usable for control-flow hijack.\nA:H - The immediate observable effect is the `WARN_ON` at net/tls/tls_strp.c:486 (a panic under `panic_on_warn`), and the subsequent dereference of freed skb metadata and wild page pointers reliably oopses the kernel."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:57:19.159Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7bdcf5bc35ae59fc4a0fa23276e84b4d1534a3cf"
        },
        {
          "url": "https://git.kernel.org/stable/c/ac91c6125468be720eafde9c973994cb45b61d44"
        },
        {
          "url": "https://git.kernel.org/stable/c/f3ce4d3f874ab7919edca364c147ac735f9f1d04"
        },
        {
          "url": "https://git.kernel.org/stable/c/2bcad8fefcecdd5f005d8c550b25d703c063c34a"
        },
        {
          "url": "https://git.kernel.org/stable/c/9fcbca0f801580cbb583e9cb274e2c7fbe766ca6"
        },
        {
          "url": "https://git.kernel.org/stable/c/c665bef891e8972e1d3ce5bbc0d42a373346a2c3"
        },
        {
          "url": "https://git.kernel.org/stable/c/8513411ec321942bd3cfed53d5bb700665c67d86"
        },
        {
          "url": "https://git.kernel.org/stable/c/5071a1e606b30c0c11278d3c6620cd6a24724cf6"
        }
      ],
      "title": "net: tls: explicitly disallow disconnect",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-37756",
    "datePublished": "2025-05-01T12:56:00.539Z",
    "dateReserved": "2025-04-16T04:51:23.938Z",
    "dateUpdated": "2026-08-05T11:57:19.159Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.