CVE-2026-72447 (GCVE-0-2026-72447)
Vulnerability from cvelistv5
Published
2026-08-15 05:56
Modified
2026-08-17 05:14
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 8f840e47f190cbe61a96945c13e9551048d42cef Version: 8f840e47f190cbe61a96945c13e9551048d42cef Version: 8f840e47f190cbe61a96945c13e9551048d42cef Version: 8f840e47f190cbe61a96945c13e9551048d42cef Version: 8f840e47f190cbe61a96945c13e9551048d42cef Version: 8f840e47f190cbe61a96945c13e9551048d42cef Version: 8f840e47f190cbe61a96945c13e9551048d42cef Version: 8f840e47f190cbe61a96945c13e9551048d42cef |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"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",
"vendor": "Linux",
"versions": [
{
"lessThan": "f98c294a9369b6fe89e652c06357ee594be4dfa2",
"status": "affected",
"version": "8f840e47f190cbe61a96945c13e9551048d42cef",
"versionType": "git"
},
{
"lessThan": "8b38e3dcfde3077dbc03eb8ef88e03cc19f70b8a",
"status": "affected",
"version": "8f840e47f190cbe61a96945c13e9551048d42cef",
"versionType": "git"
},
{
"lessThan": "ec3c2d59a192e17e1014ba71afc368ba162ecac3",
"status": "affected",
"version": "8f840e47f190cbe61a96945c13e9551048d42cef",
"versionType": "git"
},
{
"lessThan": "722576aba0a6d9423714550b1c03239b0f0def77",
"status": "affected",
"version": "8f840e47f190cbe61a96945c13e9551048d42cef",
"versionType": "git"
},
{
"lessThan": "abe7f8828e6ac8be858870c2bf836258844f97d5",
"status": "affected",
"version": "8f840e47f190cbe61a96945c13e9551048d42cef",
"versionType": "git"
},
{
"lessThan": "207bb4ce8fe7de961ae7bb33569ad2cd61f44954",
"status": "affected",
"version": "8f840e47f190cbe61a96945c13e9551048d42cef",
"versionType": "git"
},
{
"lessThan": "f09a245f33e567b604efa1960b7a2d25dd9c8713",
"status": "affected",
"version": "8f840e47f190cbe61a96945c13e9551048d42cef",
"versionType": "git"
},
{
"lessThan": "7d8297e26b4e20b5d1c3c3fe51fe81a1c7fbc823",
"status": "affected",
"version": "8f840e47f190cbe61a96945c13e9551048d42cef",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"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",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.7"
},
{
"lessThan": "4.7",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.261",
"versionStartIncluding": "4.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.212",
"versionStartIncluding": "4.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.178",
"versionStartIncluding": "4.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.145",
"versionStartIncluding": "4.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.97",
"versionStartIncluding": "4.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.40",
"versionStartIncluding": "4.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.5",
"versionStartIncluding": "4.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "4.7",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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-\u003ebase.dead)\n- Move dump position tracking into iterator, removing cb-\u003eargs[4] and\n its comment for sctp_ep_dump().,\n- Update the comment for cb-\u003eargs[4] and remove the comment for unused\n cb-\u003eargs[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."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:14:49.557Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/f98c294a9369b6fe89e652c06357ee594be4dfa2"
},
{
"url": "https://git.kernel.org/stable/c/8b38e3dcfde3077dbc03eb8ef88e03cc19f70b8a"
},
{
"url": "https://git.kernel.org/stable/c/ec3c2d59a192e17e1014ba71afc368ba162ecac3"
},
{
"url": "https://git.kernel.org/stable/c/722576aba0a6d9423714550b1c03239b0f0def77"
},
{
"url": "https://git.kernel.org/stable/c/abe7f8828e6ac8be858870c2bf836258844f97d5"
},
{
"url": "https://git.kernel.org/stable/c/207bb4ce8fe7de961ae7bb33569ad2cd61f44954"
},
{
"url": "https://git.kernel.org/stable/c/f09a245f33e567b604efa1960b7a2d25dd9c8713"
},
{
"url": "https://git.kernel.org/stable/c/7d8297e26b4e20b5d1c3c3fe51fe81a1c7fbc823"
}
],
"title": "sctp: hold socket lock when dumping endpoints in sctp_diag",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-72447",
"datePublished": "2026-08-15T05:56:57.089Z",
"dateReserved": "2026-08-09T03:40:39.931Z",
"dateUpdated": "2026-08-17T05:14:49.557Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…