HighFix available
sctp: detect and prevent references to a freed transport in sendmsg
Type: advisorySources: OSV
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
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.237, 5.15.181, 5.4.293, 6.1.135, 6.12.24, 6.13.12, 6.14.3, 6.6.88
- CVEs
- CVE-2025-23142
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 14:35 UTC · Revision 1
Source evidence
sctp: detect and prevent references to a freed transport in sendmsg
core-osv · Original sourcePublished 1 May 2025, 12:55 UTC
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
osv:CVE-2025-23142
Kernel
Fixed versions: 5.4.293, 5.10.237, 5.15.181, 6.1.135, 6.6.88, 6.12.24, 6.13.12, 6.14.3
Complete source record
{
"id": "28f62b12606a260e58cca7c329cc6a631cc3f7074a1a077ba7718d9cb4d9424b",
"url": "https://osv.dev/vulnerability/CVE-2025-23142",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "sctp: detect and prevent references to a freed transport in sendmsg",
"summary": "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",
"evidence": "osv:CVE-2025-23142",
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"provider": "osv",
"references": [
"https://git.kernel.org/stable/c/0f7df4899299ce4662e5f95badb9dbc57cc37fa5",
"https://git.kernel.org/stable/c/2e5068b7e0ae0a54f6cfd03a2f80977da657f1ee",
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"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/23xxx/CVE-2025-23142.json",
"https://nvd.nist.gov/vuln/detail/CVE-2025-23142",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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"evidence": "/id"
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"source_id": "core-osv",
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"published_at": "2025-05-01T12:55:32.614+00:00"
}