CVE-2026-72447
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: sctp: hold socket lock when dumping endpoints in sctp_diag SCTP_DIAG endpoint dumping was traversing endpoint address lists without holding lock_sock(), while those lists could change concurrently via socket operations (e.g., bindx changes). This creates a race where nla_reserve() counts addresses under RCU protection, but the subsequent copy may see fewer entries, potentially leaking uninitialized memory to userspace. Fix this by: - Taking a reference on each endpoint during hash traversal - Moving socket operations (lock_sock()) outside read_lock_bh() - Serializing address list access during dump - Reworking sctp_for_each_endpoint() to support restart-based traversal with (net, pos) tracking Also: - Add WARN_ON_ONCE() for inconsistent address counts - Fix idiag_states filtering for LISTEN vs association cases - Skip dumping endpoints being freed (ep->base.dead) - Move dump position tracking into iterator, removing cb->args[4] and its comment for sctp_ep_dump()., - Update the comment for cb->args[4] and remove the comment for unused cb->args[5] for sctp_sock_dump(). Note: traversal is restart-based and may re-scan buckets multiple times, but this is acceptable due to small bucket sizes and required to support sleeping-safe callbacks. This issue was reported by Nico Yip (@_cyeaa_) working with TrendAI Zero Day Initiative.
Severity
Not scored
CVSS score
Not available
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-08-15 06:22:18.600000
Last modified
2026-11-06 17:19:44.627000
View original CVE JSON
{
"id": "CVE-2026-72447",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-08-15T06:22:18.600",
"lastModified": "2026-11-06T17:19:44.627",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: hold socket lock when dumping endpoints in sctp_diag\n\nSCTP_DIAG endpoint dumping was traversing endpoint address lists without\nholding lock_sock(), while those lists could change concurrently via\nsocket operations (e.g., bindx changes). This creates a race where\nnla_reserve() counts addresses under RCU protection, but the subsequent\ncopy may see fewer entries, potentially leaking uninitialized memory to\nuserspace.\n\nFix this by:\n\n- Taking a reference on each endpoint during hash traversal\n- Moving socket operations (lock_sock()) outside read_lock_bh()\n- Serializing address list access during dump\n- Reworking sctp_for_each_endpoint() to support restart-based traversal\n with (net, pos) tracking\n\nAlso:\n\n- Add WARN_ON_ONCE() for inconsistent address counts\n- Fix idiag_states filtering for LISTEN vs association cases\n- Skip dumping endpoints being freed (ep->base.dead)\n- Move dump position tracking into iterator, removing cb->args[4] and\n its comment for sctp_ep_dump().,\n- Update the comment for cb->args[4] and remove the comment for unused\n cb->args[5] for sctp_sock_dump().\n\nNote: traversal is restart-based and may re-scan buckets multiple times,\nbut this is acceptable due to small bucket sizes and required to support\nsleeping-safe callbacks.\n\nThis issue was reported by Nico Yip (@_cyeaa_) working with TrendAI Zero\nDay Initiative."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"include/net/sctp/sctp.h",
"net/sctp/diag.c",
"net/sctp/socket.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"versionType": "git",
"status": "affected"
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{
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"programFiles": [
"include/net/sctp/sctp.h",
"net/sctp/diag.c",
"net/sctp/socket.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
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"status": "affected"
},
{
"version": "0",
"lessThan": "4.7",
"versionType": "semver",
"status": "unaffected"
},
{
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"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.15.212",
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"status": "unaffected"
},
{
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"status": "unaffected"
},
{
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},
{
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"status": "unaffected"
},
{
"version": "6.18.40",
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"status": "unaffected"
},
{
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"versionType": "semver",
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},
{
"version": "7.2",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-11-06T16:55:33.287440Z",
"id": "CVE-2026-72447",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
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