CVE-2025-38616 (GCVE-0-2025-38616)

Vulnerability from cvelistv5 – Published: 2025-08-22 13:01 – Updated: 2026-08-05 12:03
VLAI
Title
tls: handle data disappearing from under the TLS ULP
Summary
In the Linux kernel, the following vulnerability has been resolved: tls: handle data disappearing from under the TLS ULP TLS expects that it owns the receive queue of the TCP socket. This cannot be guaranteed in case the reader of the TCP socket entered before the TLS ULP was installed, or uses some non-standard read API (eg. zerocopy ones). Replace the WARN_ON() and a buggy early exit (which leaves anchor pointing to a freed skb) with real error handling. Wipe the parsing state and tell the reader to retry. We already reload the anchor every time we (re)acquire the socket lock, so the only condition we need to avoid is an out of bounds read (not having enough bytes in the socket for previously parsed record len). If some data was read from under TLS but there's enough in the queue we'll reload and decrypt what is most likely not a valid TLS record. Leading to some undefined behavior from TLS perspective (corrupting a stream? missing an alert? missing an attack?) but no kernel crash should take place.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-10 20:40 UTC
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 84c61fe1a75b4255df1e1e7c054c9e6d048da417 , < f1fe99919f629f980d0b8a7ff16950bffe06a859 (git)
Affected: 84c61fe1a75b4255df1e1e7c054c9e6d048da417 , < eb0336f213fe88bbdb7d2b19c9c9ec19245a3155 (git)
Affected: 84c61fe1a75b4255df1e1e7c054c9e6d048da417 , < db3658a12d5ec4db7185ae7476151a50521b7207 (git)
Affected: 84c61fe1a75b4255df1e1e7c054c9e6d048da417 , < 2fb97ed9e2672b4f6e24ce206ac1a875ce4bcb38 (git)
Affected: 84c61fe1a75b4255df1e1e7c054c9e6d048da417 , < 6db015fc4b5d5f63a64a193f65d98da3a7fc811d (git)
Create a notification for this product.
Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.6.103 , ≤ 6.6.* (semver)
Unaffected: 6.12.43 , ≤ 6.12.* (semver)
Unaffected: 6.15.11 , ≤ 6.15.* (semver)
Unaffected: 6.16.2 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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Esto no se puede garantizar en caso de que el lector del socket TCP haya entrado antes de que se instalara el ULP de TLS o utilice alguna API de lectura no est\u00e1ndar (p. ej., las de copia cero). Reemplace WARN_ON() y una salida temprana con errores (que deja el ancla apuntando a un skb liberado) con un manejo de errores real. Limpie el estado de an\u00e1lisis y d\u00edgale al lector que lo vuelva a intentar. Ya recargamos el ancla cada vez que (re)adquirimos el bloqueo del socket, por lo que la \u00fanica condici\u00f3n que debemos evitar es una lectura fuera de los l\u00edmites (no tener suficientes bytes en el socket para la longitud del registro analizado previamente). Si se leyeron algunos datos bajo TLS pero hay suficientes en la cola, recargaremos y descifraremos lo que probablemente no sea un registro TLS v\u00e1lido. Esto genera un comportamiento indefinido desde la perspectiva de TLS (\u00bfcorromper una transmisi\u00f3n? \u00bfperder una alerta? \u00bfperder un ataque?) pero no deber\u00eda producirse ninguna falla del 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      "title": "kernel: Linux kernel: Denial of Service in kTLS due to race condition in receive path",
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    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-38616\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-10T20:40:59.907591Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-11T17:37:52.640Z\"}}], \"cna\": {\"title\": \"tls: handle data disappearing from under the TLS ULP\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"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\"}}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"84c61fe1a75b4255df1e1e7c054c9e6d048da417\", \"lessThan\": \"f1fe99919f629f980d0b8a7ff16950bffe06a859\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"84c61fe1a75b4255df1e1e7c054c9e6d048da417\", \"lessThan\": \"eb0336f213fe88bbdb7d2b19c9c9ec19245a3155\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"84c61fe1a75b4255df1e1e7c054c9e6d048da417\", \"lessThan\": \"db3658a12d5ec4db7185ae7476151a50521b7207\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"84c61fe1a75b4255df1e1e7c054c9e6d048da417\", \"lessThan\": \"2fb97ed9e2672b4f6e24ce206ac1a875ce4bcb38\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"84c61fe1a75b4255df1e1e7c054c9e6d048da417\", \"lessThan\": \"6db015fc4b5d5f63a64a193f65d98da3a7fc811d\", \"versionType\": \"git\"}], \"programFiles\": [\"net/tls/tls.h\", \"net/tls/tls_strp.c\", \"net/tls/tls_sw.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.0\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.0\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.6.103\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.43\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.15.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.16.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.16.*\"}, {\"status\": \"unaffected\", \"version\": \"6.17\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/tls/tls.h\", \"net/tls/tls_strp.c\", \"net/tls/tls_sw.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/f1fe99919f629f980d0b8a7ff16950bffe06a859\"}, {\"url\": \"https://git.kernel.org/stable/c/eb0336f213fe88bbdb7d2b19c9c9ec19245a3155\"}, {\"url\": \"https://git.kernel.org/stable/c/db3658a12d5ec4db7185ae7476151a50521b7207\"}, {\"url\": \"https://git.kernel.org/stable/c/2fb97ed9e2672b4f6e24ce206ac1a875ce4bcb38\"}, {\"url\": \"https://git.kernel.org/stable/c/6db015fc4b5d5f63a64a193f65d98da3a7fc811d\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntls: handle data disappearing from under the TLS ULP\\n\\nTLS expects that it owns the receive queue of the TCP socket.\\nThis cannot be guaranteed in case the reader of the TCP socket\\nentered before the TLS ULP was installed, or uses some non-standard\\nread API (eg. zerocopy ones). Replace the WARN_ON() and a buggy\\nearly exit (which leaves anchor pointing to a freed skb) with real\\nerror handling. Wipe the parsing state and tell the reader to retry.\\n\\nWe already reload the anchor every time we (re)acquire the socket lock,\\nso the only condition we need to avoid is an out of bounds read\\n(not having enough bytes in the socket for previously parsed record len).\\n\\nIf some data was read from under TLS but there\u0027s enough in the queue\\nwe\u0027ll reload and decrypt what is most likely not a valid TLS record.\\nLeading to some undefined behavior from TLS perspective (corrupting\\na stream? missing an alert? missing an attack?) but no kernel crash\\nshould take place.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.103\", \"versionStartIncluding\": \"6.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.43\", \"versionStartIncluding\": \"6.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.15.11\", \"versionStartIncluding\": \"6.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.16.2\", \"versionStartIncluding\": \"6.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.17\", \"versionStartIncluding\": \"6.0\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-07-30T05:55:47.710Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-38616\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-30T05:55:47.710Z\", \"dateReserved\": \"2025-04-16T04:51:24.029Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-08-22T13:01:23.217Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





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.