CVE-2025-38524 (GCVE-0-2025-38524)

Vulnerability from cvelistv5 – Published: 2025-08-16 11:12 – Updated: 2026-05-11 21:29
VLAI?
Title
rxrpc: Fix recv-recv race of completed call
Summary
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix recv-recv race of completed call If a call receives an event (such as incoming data), the call gets placed on the socket's queue and a thread in recvmsg can be awakened to go and process it. Once the thread has picked up the call off of the queue, further events will cause it to be requeued, and once the socket lock is dropped (recvmsg uses call->user_mutex to allow the socket to be used in parallel), a second thread can come in and its recvmsg can pop the call off the socket queue again. In such a case, the first thread will be receiving stuff from the call and the second thread will be blocked on call->user_mutex. The first thread can, at this point, process both the event that it picked call for and the event that the second thread picked the call for and may see the call terminate - in which case the call will be "released", decoupling the call from the user call ID assigned to it (RXRPC_USER_CALL_ID in the control message). The first thread will return okay, but then the second thread will wake up holding the user_mutex and, if it sees that the call has been released by the first thread, it will BUG thusly: kernel BUG at net/rxrpc/recvmsg.c:474! Fix this by just dequeuing the call and ignoring it if it is seen to be already released. We can't tell userspace about it anyway as the user call ID has become stale.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 248f219cb8bcbfbd7f132752d44afa2df7c241d1 , < 7692bde890061797f3dece0148d7859e85c55778 (git)
Affected: 248f219cb8bcbfbd7f132752d44afa2df7c241d1 , < 839fe96c15209dc2255c064bb44b636efe04f032 (git)
Affected: 248f219cb8bcbfbd7f132752d44afa2df7c241d1 , < 6c75a97a32a5fa2060c3dd30207e63b6914b606d (git)
Affected: 248f219cb8bcbfbd7f132752d44afa2df7c241d1 , < 962fb1f651c2cf2083e0c3ef53ba69e3b96d3fbc (git)
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Linux Linux Affected: 4.9
Unaffected: 0 , < 4.9 (semver)
Unaffected: 6.6.100 , ≤ 6.6.* (semver)
Unaffected: 6.12.40 , ≤ 6.12.* (semver)
Unaffected: 6.15.8 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
            "include/trace/events/rxrpc.h",
            "net/rxrpc/call_accept.c",
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    "datePublished": "2025-08-16T11:12:18.314Z",
    "dateReserved": "2025-04-16T04:51:24.023Z",
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Once the thread has picked up the call off of the queue,\\nfurther events will cause it to be requeued, and once the socket lock is\\ndropped (recvmsg uses call-\u003euser_mutex to allow the socket to be used in\\nparallel), a second thread can come in and its recvmsg can pop the call off\\nthe socket queue again.\\n\\nIn such a case, the first thread will be receiving stuff from the call and\\nthe second thread will be blocked on call-\u003euser_mutex.  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En ese caso, la llamada se \\\"liberar\u00e1\\\", desvincul\u00e1ndola del ID de llamada de usuario que se le asign\u00f3 (RXRPC_USER_CALL_ID en el mensaje de control). El primer hilo retornar\u00e1 correctamente, pero el segundo hilo se reactivar\u00e1 con el user_mutex y, si detecta que el primer hilo ha liberado la llamada, generar\u00e1 el siguiente error: \u00a1error del kernel en net/rxrpc/recvmsg.c:474! Para solucionar esto, simplemente retire la llamada de la cola e ignore si ya est\u00e1 liberada. De todos modos, no podemos informar al espacio de usuario, ya que el ID de llamada de usuario ha quedado obsoleto.\"}],\"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\":\"4.9\",\"versionEndExcluding\":\"6.6.100\",\"matchCriteriaId\":\"5B60D16D-727D-40AD-91FE-5272637AE855\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.40\",\"matchCriteriaId\":\"0099D5A4-B157-4D36-8858-982C7D579030\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.15.8\",\"matchCriteriaId\":\"C7AFE5B0-F3B1-4D30-B8BF-EDA0385C4746\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"6D4894DB-CCFE-4602-B1BF-3960B2E19A01\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"09709862-E348-4378-8632-5A7813EDDC86\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"415BF58A-8197-43F5-B3D7-D1D63057A26E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"A0517869-312D-4429-80C2-561086E1421C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"85421F4E-C863-4ABF-B4B4-E887CC2F7F92\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"3827F0D4-5FEE-4181-B267-5A45E7CA11FC\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/6c75a97a32a5fa2060c3dd30207e63b6914b606d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7692bde890061797f3dece0148d7859e85c55778\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/839fe96c15209dc2255c064bb44b636efe04f032\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/962fb1f651c2cf2083e0c3ef53ba69e3b96d3fbc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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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

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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.