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sctp: detect and prevent references to a freed transport in sendmsg

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: sctp: detect and prevent references to a freed transport in sendmsg sctp_sendmsg() re-uses associations and transports when possible by doing a lookup based on the socket endpoint and the message destination address, and then sctp_sendmsg_to_asoc() sets the selected transport in all the message chunks to be sent. There's a possible race condition if another thread triggers the removal of that selected transport, for instance, by explicitly unbinding an address with setsockopt(SCTP_SOCKOPT_BINDX_REM), after the chunks have been set up and before the message is sent. This can happen if the send buffer is full, during the period when the sender thread temporarily releases the socket lock in sctp_wait_for_sndbuf(). This causes the access to the transport data in sctp_outq_select_transport(), when the association outqueue is flushed, to result in a use-after-free read. This change avoids this scenario by having sctp_transport_free() signal the freeing of the transport, tagging it as "dead". In order to do this, the patch restores the "dead" bit in struct sctp_transport, which was removed in commit 47faa1e4c50e ("sctp: remove the dead field of sctp_transport"). Then, in the scenario where the sender thread has released the socket lock in sctp_wait_for_sndbuf(), the bit is checked again after re-acquiring the socket lock to detect the deletion. This is done while holding a reference to the transport to prevent it fr

Announced Source revision 1
Original source ↗

CVE-2025-23142

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2025-23142

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "df132eff463873e14e019a07f387b4d577d6d1f9",
        "lessThan": "547762250220325d350d0917a7231480e0f4142b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "df132eff463873e14e019a07f387b4d577d6d1f9",
        "lessThan": "3257386be6a7eb8a8bfc9cbfb746df4eb4fc70e8",
        "versionType": "git"
      },
      {
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        "lessThan": "0f7df4899299ce4662e5f95badb9dbc57cc37fa5",
        "versionType": "git"
      },
      {
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      },
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      },
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      },
      {
        "status": "affected",
        "version": "cd947138e8c31e8cfcd489c12e9b97271beb6e79",
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      },
      {
        "status": "affected",
        "version": "3.18.128",
        "lessThan": "3.19",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "4.4.166",
        "lessThan": "4.5",
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      },
      {
        "status": "affected",
        "version": "4.9.142",
        "lessThan": "4.10",
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      },
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        "status": "affected",
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      {
        "status": "affected",
        "version": "4.19.6",
        "lessThan": "4.20",
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      }
    ],
    "programFiles": [
      "include/net/sctp/structs.h",
      "net/sctp/socket.c",
      "net/sctp/transport.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
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        "version": "0",
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        "version": "5.4.293",
        "versionType": "semver",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.237",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.181",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
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        "version": "6.1.135",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
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        "version": "6.6.88",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.24",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.13.12",
        "versionType": "semver",
        "lessThanOrEqual": "6.13.*"
      },
      {
        "status": "unaffected",
        "version": "6.14.3",
        "versionType": "semver",
        "lessThanOrEqual": "6.14.*"
      },
      {
        "status": "unaffected",
        "version": "6.15",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "include/net/sctp/structs.h",
      "net/sctp/socket.c",
      "net/sctp/transport.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-23142

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30465 · Revision 1
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Publisher date
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