In the Linux kernel, the following vulnerability has been resolved:
sctp: don't free the ASCONF's own transport in DEL-IP processing
sctp_process_asconf() caches the transport the ASCONF chunk is processed
against in asconf->transport (== chunk->transport, set once in sctp_rcv()).
For an ASCONF located through its Address Parameter by
__sctp_rcv_asconf_lookup(), that cached transport corresponds to the
Address Parameter, which need not be the packet's source address.
sctp_process_asconf_param() rejects a DEL-IP for the packet source address
(ADDIP D8, SCTP_ERROR_DEL_SRC_IP), but nothing protects asconf->transport.
A single ASCONF can therefore carry, in order:
[Address Parameter L] [DEL-IP L] [DEL-IP 0.0.0.0]
where L differs from the source. The DEL-IP for L passes the D8 check and
calls sctp_assoc_rm_peer() on the transport that asconf->transport still
points at, freeing it (RCU-deferred). The following wildcard DEL-IP then
reuses the now-dangling asconf->transport in sctp_assoc_set_primary() and
sctp_assoc_del_nonprimary_peers(): set_primary() dereferences the freed
transport (->ipaddr, ->state) and plants the dangling pointer into
asoc->peer.primary_path / active_path, and del_nonprimary_peers(), keeping
only the pointer that is no longer on the list, removes every real
transport, leaving the association with a transport_count of 0 and
primary_path/active_path pointing at freed memory.
Reject a DEL-IP that targets the transport the ASCONF is being processed
against, mirroring the existing source-address guard, so the wildcard
branch can never reuse a freed transport.
References
Configurations
Configuration 1 (hide)
|
History
12 Nov 2026, 20:15
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://git.kernel.org/stable/c/2b324ba3494ae958cba16a453e3e71489b4de7fc - Patch | |
| References | () https://git.kernel.org/stable/c/74e8f3e7114f0e26d1b2c4c048044db9fcc27603 - Patch | |
| References | () https://git.kernel.org/stable/c/85aca407c560aba81b5ce9d3d6cf94c74077d19b - Patch | |
| References | () https://git.kernel.org/stable/c/9b2854f86f0b56e9027d68e7a3fc909d1a9b566f - Patch | |
| References | () https://git.kernel.org/stable/c/a63afa1f9b12d5293cbe0b77fd45dc0632533a13 - Patch | |
| References | () https://git.kernel.org/stable/c/a9ce31be4cb1a5dd82b3e0a1d0c3e7cbdcd31293 - Patch | |
| References | () https://git.kernel.org/stable/c/d136b29bf91dd8e3161281b87de597b7311d9462 - Patch | |
| References | () https://git.kernel.org/stable/c/fedeb4468987bcaff85fe3061de5ae052d414740 - Patch | |
| References | () https://matrix.tencent.com/en/2026/08/06/sctphantom-CVE-2026-64564 - Exploit, Third Party Advisory | |
| References | () http://www.openwall.com/lists/oss-security/2026/08/06/13 - Mailing List | |
| References | () http://www.openwall.com/lists/oss-security/2026/08/06/3 - Mailing List | |
| References | () http://www.openwall.com/lists/oss-security/2026/08/06/4 - Mailing List | |
| References | () http://www.openwall.com/lists/oss-security/2026/08/07/1 - Mailing List | |
| References | () http://www.openwall.com/lists/oss-security/2026/08/07/2 - Mailing List | |
| References | () http://www.openwall.com/lists/oss-security/2026/08/07/8 - Mailing List | |
| CPE | cpe:2.3:o:linux:linux_kernel:7.2:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.2:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.2:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.2:rc2:*:*:*:*:*:* |
|
| First Time |
Linux linux Kernel
Linux |
19 Oct 2026, 21:17
| Type | Values Removed | Values Added |
|---|---|---|
| CWE | CWE-416 |
Information
Published : 2026-08-04 07:16
Updated : 2026-11-12 20:15
NVD link : CVE-2026-64564
Mitre link : CVE-2026-64564
CVE.ORG link : CVE-2026-64564
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-416
Use After Free