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

Vulnerability from cvelistv5 – Published: 2025-05-01 12:56 – Updated: 2026-08-05 11:57
VLAI
Title
net: tls: explicitly disallow disconnect
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
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
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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)
guessed Create a notification for this product.
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-37756\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-05-01T13:15:54.370\",\"lastModified\":\"2026-07-30T06:22:19.233\",\"vulnStatus\":\"Modified\",\"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\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/tls/tls_main.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3c4d7559159bfe1e3b94df3a657b2cda3a34e218\",\"lessThan\":\"7bdcf5bc35ae59fc4a0fa23276e84b4d1534a3cf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3c4d7559159bfe1e3b94df3a657b2cda3a34e218\",\"lessThan\":\"ac91c6125468be720eafde9c973994cb45b61d44\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3c4d7559159bfe1e3b94df3a657b2cda3a34e218\",\"lessThan\":\"f3ce4d3f874ab7919edca364c147ac735f9f1d04\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3c4d7559159bfe1e3b94df3a657b2cda3a34e218\",\"lessThan\":\"2bcad8fefcecdd5f005d8c550b25d703c063c34a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3c4d7559159bfe1e3b94df3a657b2cda3a34e218\",\"lessThan\":\"9fcbca0f801580cbb583e9cb274e2c7fbe766ca6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3c4d7559159bfe1e3b94df3a657b2cda3a34e218\",\"lessThan\":\"c665bef891e8972e1d3ce5bbc0d42a373346a2c3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3c4d7559159bfe1e3b94df3a657b2cda3a34e218\",\"lessThan\":\"8513411ec321942bd3cfed53d5bb700665c67d86\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3c4d7559159bfe1e3b94df3a657b2cda3a34e218\",\"lessThan\":\"5071a1e606b30c0c11278d3c6620cd6a24724cf6\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/tls/tls_main.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.13\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.13\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.237\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.181\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.135\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.88\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.24\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.13.12\",\"lessThanOrEqual\":\"6.13.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.14.3\",\"lessThanOrEqual\":\"6.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.15\",\"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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.13\",\"versionEndExcluding\":\"5.10.237\",\"matchCriteriaId\":\"E5E88B86-BD7B-40BA-94BA-8AA10CEE8C06\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.181\",\"matchCriteriaId\":\"12331C9E-F601-4EFC-899E-369F98DCC70B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.135\",\"matchCriteriaId\":\"5B9ACE29-7445-4B6F-B761-6367C005E275\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.88\",\"matchCriteriaId\":\"6E5947E5-45E3-462A-829B-382B3B1C61BD\"},{\"vulnerable\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List\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-30T10:12:25+00:00",
      "cve": "CVE-2025-37756",
      "id": "CVE-2025-37756",
      "initial_release_date": "2025-05-01T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: tls: explicitly disallow disconnect",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-37756.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-01T01:03:25Z",
      "cve": "CVE-2025-37756",
      "id": "CVE-2025-37756",
      "initial_release_date": "2025-05-02T02:02:55Z",
      "product_status:known_affected": "686",
      "product_status:known_not_affected": "96",
      "product_status:recommended": "419",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-37756",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-37756.json",
      "version": "54"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.


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.