Kernel memory access via SCTP transport race
Published May 1, 2025 · Updated Aug 5, 2026
Use-after-free in Linux kernel SCTP allows local users to access freed transport data by racing message sending with address removal. SCTP sendmsg binds a selected transport to queued chunks, then sctp_wait_for_sndbuf releases the socket lock while a full send buffer waits, allowing another thread to free that transport before sctp_outq_select_transport reads it. The gate requires a low-privileged local process, concurrent sends and address unbinding, and a full SCTP send buffer.
Summary
What happened
Use-after-free in Linux kernel SCTP allows local users to access freed transport data by racing message sending with address removal. SCTP sendmsg binds a selected transport to queued chunks, then sctp_wait_for_sndbuf releases the socket lock while a full send buffer waits, allowing another thread to free that transport before sctp_outq_select_transport reads it. The gate requires a low-privileged local process, concurrent sends and address unbinding, and a full SCTP send buffer.
The record
- CVE
- CVE-2025-23142
- Published
- May 1, 2025
- Updated
- Aug 5, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-416
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- May 1, 2025CVE publishedPublication date reported by the CVE source.
- Aug 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=26e51e5287eed4d96ea66a3da95429f42940f013
- Affected versionversion=3.18.128 <3.19
- Affected versionversion=4.14.85 <4.15
- Affected versionversion=4.19.6 <4.20
- Affected versionversion=4.20
- Affected versionversion=4.4.166 <4.5
- Affected versionversion=4.9.142 <4.10
- Affected versionversion=8376fdc999be008f0e9918db52f1ed8c08f5a1c9
- Affected versionversion=8b97e045bd6d37f96f161e4d371ae174148e1587
- Affected versionversion=cd947138e8c31e8cfcd489c12e9b97271beb6e79
- Affected versionversion=df132eff463873e14e019a07f387b4d577d6d1f9 <0f7df4899299ce4662e5f95badb9dbc57cc37fa5
- Affected versionversion=df132eff463873e14e019a07f387b4d577d6d1f9 <2e5068b7e0ae0a54f6cfd03a2f80977da657f1ee
- Affected versionversion=df132eff463873e14e019a07f387b4d577d6d1f9 <3257386be6a7eb8a8bfc9cbfb746df4eb4fc70e8
- Affected versionversion=df132eff463873e14e019a07f387b4d577d6d1f9 <547762250220325d350d0917a7231480e0f4142b
- Affected versionversion=df132eff463873e14e019a07f387b4d577d6d1f9 <5bc83bdf5f5b8010d1ca5a4555537e62413ab4e2
- Affected versionversion=df132eff463873e14e019a07f387b4d577d6d1f9 <7a63f4fb0efb4e69efd990cbb740a848679ec4b0
- Affected versionversion=df132eff463873e14e019a07f387b4d577d6d1f9 <9e7c37fadb3be1fc33073fcf10aa96d166caa697
- Affected versionversion=df132eff463873e14e019a07f387b4d577d6d1f9 <c6fefcb71d246baaf3bacdad1af7ff50ebcfe652
- Affected versionversion=df132eff463873e14e019a07f387b4d577d6d1f9 <f1a69a940de58b16e8249dff26f74c8cc59b32be
- Affected versionversion=e044554e97e812eb257d073bcc130e0ea653858f
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo