sctp: don't free the ASCONF's own transport in DEL-IP processing
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, mirror
CVE-2026-64564
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-2026-64564
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": "42e30bf3463cd37d73839376662cb79b4d5c416c",
"lessThan": "a9ce31be4cb1a5dd82b3e0a1d0c3e7cbdcd31293",
"versionType": "git"
},
{
"status": "affected",
"version": "42e30bf3463cd37d73839376662cb79b4d5c416c",
"lessThan": "a63afa1f9b12d5293cbe0b77fd45dc0632533a13",
"versionType": "git"
},
{
"status": "affected",
"version": "42e30bf3463cd37d73839376662cb79b4d5c416c",
"lessThan": "2b324ba3494ae958cba16a453e3e71489b4de7fc",
"versionType": "git"
},
{
"status": "affected",
"version": "42e30bf3463cd37d73839376662cb79b4d5c416c",
"lessThan": "fedeb4468987bcaff85fe3061de5ae052d414740",
"versionType": "git"
},
{
"status": "affected",
"version": "42e30bf3463cd37d73839376662cb79b4d5c416c",
"lessThan": "74e8f3e7114f0e26d1b2c4c048044db9fcc27603",
"versionType": "git"
},
{
"status": "affected",
"version": "42e30bf3463cd37d73839376662cb79b4d5c416c",
"lessThan": "85aca407c560aba81b5ce9d3d6cf94c74077d19b",
"versionType": "git"
},
{
"status": "affected",
"version": "42e30bf3463cd37d73839376662cb79b4d5c416c",
"lessThan": "d136b29bf91dd8e3161281b87de597b7311d9462",
"versionType": "git"
},
{
"status": "affected",
"version": "42e30bf3463cd37d73839376662cb79b4d5c416c",
"lessThan": "9b2854f86f0b56e9027d68e7a3fc909d1a9b566f",
"versionType": "git"
}
],
"programFiles": [
"net/sctp/sm_make_chunk.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.25"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.25",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.148",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/sctp/sm_make_chunk.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-64564
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #41091 · Revision 1
- Added to Heist Feed
- Publisher date