CVE-2025-37756 (GCVE-0-2025-37756)
Vulnerability from cvelistv5
Published
2025-05-01 12:56
Modified
2025-05-26 05:20
Severity ?
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
Impacted products
Vendor Product Version
Linux Linux Version: 3c4d7559159bfe1e3b94df3a657b2cda3a34e218
Version: 3c4d7559159bfe1e3b94df3a657b2cda3a34e218
Version: 3c4d7559159bfe1e3b94df3a657b2cda3a34e218
Version: 3c4d7559159bfe1e3b94df3a657b2cda3a34e218
Version: 3c4d7559159bfe1e3b94df3a657b2cda3a34e218
Version: 3c4d7559159bfe1e3b94df3a657b2cda3a34e218
Version: 3c4d7559159bfe1e3b94df3a657b2cda3a34e218
Version: 3c4d7559159bfe1e3b94df3a657b2cda3a34e218
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/tls/tls_main.c"
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          "product": "Linux",
          "programFiles": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "4.13"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.237",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "5.15.181",
              "versionType": "semver"
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              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.135",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.6.88",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.24",
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              "version": "6.13.12",
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              "version": "6.14.3",
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              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "negate": false,
              "operator": "OR"
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      ],
      "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"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-26T05:20:11.963Z",
        "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"
        },
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          "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"
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    }
  },
  "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": "2025-05-26T05:20:11.963Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-37756\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-05-01T13:15:54.370\",\"lastModified\":\"2025-05-02T13:53:20.943\",\"vulnStatus\":\"Awaiting Analysis\",\"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\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2bcad8fefcecdd5f005d8c550b25d703c063c34a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5071a1e606b30c0c11278d3c6620cd6a24724cf6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7bdcf5bc35ae59fc4a0fa23276e84b4d1534a3cf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8513411ec321942bd3cfed53d5bb700665c67d86\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9fcbca0f801580cbb583e9cb274e2c7fbe766ca6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ac91c6125468be720eafde9c973994cb45b61d44\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c665bef891e8972e1d3ce5bbc0d42a373346a2c3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f3ce4d3f874ab7919edca364c147ac735f9f1d04\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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