CVE-2026-74469 (GCVE-0-2026-74469)
Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-19 16:37
VLAI
EPSS
VEX
Title
sctp: prevent peer transport count overflow
Summary
In the Linux kernel, the following vulnerability has been resolved:
sctp: prevent peer transport count overflow
sctp_assoc_add_peer() increments the association's 16-bit transport_count
for every new unique peer. Adding the 65,536th transport wraps the count to
zero.
SCTP sock_diag uses transport_count to reserve the INET_DIAG_PEERS payload,
then copies one sockaddr_storage for every entry in transport_addr_list.
After the wrap, a diagnostic dump reserves an empty payload and writes
8 MiB of peer addresses past the skb tail.
Reject a new unique peer when transport_count has reached U16_MAX. Perform
the check after the existing-peer lookup so a duplicate address continues
to return its existing transport at the limit.
Severity
8.8 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
8f840e47f190cbe61a96945c13e9551048d42cef , < b453e00da1211e997b82743d28af7714c59c05c8
(git)
Affected: 8f840e47f190cbe61a96945c13e9551048d42cef , < dfea32dd76f390e3155177b0038cc47b01386198 (git) Affected: 8f840e47f190cbe61a96945c13e9551048d42cef , < 80f48523a0fe42db2e7375dff4e38a25c117090a (git) Affected: 8f840e47f190cbe61a96945c13e9551048d42cef , < 546221b86ceeba0d8fec92d46a0604bb7b62be07 (git) Affected: 8f840e47f190cbe61a96945c13e9551048d42cef , < 09e722030e8148ba4ed1e42c6b2ea57bda9f9895 (git) Affected: 8f840e47f190cbe61a96945c13e9551048d42cef , < 4ba5bf7ed50f235ea4581de8e7a0002f4ed287b0 (git) Affected: 8f840e47f190cbe61a96945c13e9551048d42cef , < 6201cd1d70f1670c5b31ac506e7ab2fa7b8e7f75 (git) Affected: 8f840e47f190cbe61a96945c13e9551048d42cef , < bd0e9289e2642f6a5c54faad304ce0f41e926d22 (git) |
guessed | |
| Linux | Linux |
Affected:
4.7
Unaffected: 0 , < 4.7 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.151 , ≤ 6.6.* (semver) Unaffected: 6.12.103 , ≤ 6.12.* (semver) Unaffected: 6.18.44 , ≤ 6.18.* (semver) Unaffected: 7.1.8 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/sctp/associola.c"
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{
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},
{
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"status": "unaffected",
"version": "5.10.265",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.15.216",
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},
{
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"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.151",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.12.103",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.18.44",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
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"versionStartIncluding": "4.7",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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{
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},
{
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}
],
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"operator": "OR"
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: prevent peer transport count overflow\n\nsctp_assoc_add_peer() increments the association\u0027s 16-bit transport_count\nfor every new unique peer. Adding the 65,536th transport wraps the count to\nzero.\n\nSCTP sock_diag uses transport_count to reserve the INET_DIAG_PEERS payload,\nthen copies one sockaddr_storage for every entry in transport_addr_list.\nAfter the wrap, a diagnostic dump reserves an empty payload and writes\n8 MiB of peer addresses past the skb tail.\n\nReject a new unique peer when transport_count has reached U16_MAX. Perform\nthe check after the existing-peer lookup so a duplicate address continues\nto return its existing transport at the limit."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - Remote SCTP peers add unique transports via INIT address parameters and ASCONF ADD_IP chunks processed in sctp_assoc_add_peer(); this is network ingress on SCTP servers (telecom, signaling gateways) before any local diagnostic action.\nAC:L - An attacker controlling an SCTP association can script 65536 unique peer addresses via connectx, repeated ASCONF ADD_IP, or INIT parameters; no race or victim-specific state is required beyond reaching the transport limit.\nPR:L - The heap overflow is triggered via NETLINK_SOCK_DIAG (ss/netlink), reachable by unprivileged users; SCTP socket creation and connectx need no capabilities beyond a normal local account (including user namespaces).\nUI:N - Exploitation requires no victim interaction; the attacker drives transport accumulation and issues the diagnostic dump themselves.\nS:U - Impact is kernel heap corruption within the same kernel security boundary; this is not a VM escape, sandbox breakout, or cross-authority scope change.\nC:H - When transport_count wraps to zero, inet_diag_msg_sctpaddrs_fill() reserves no space but iterates all 65536 transports, writing ~8 MiB past the skb tail and enabling adjacent kernel heap reads.\nI:H - The same diag path performs a massive out-of-bounds write of sockaddr_storage entries past the allocated skb buffer, corrupting adjacent kernel heap objects and enabling control-flow hijacking.\nA:H - Corrupting sk_buff heap metadata and adjacent allocations via an ~8 MiB out-of-bounds write can cause kernel oops, panic, or hang, meeting high availability impact."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:37:15.198Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/b453e00da1211e997b82743d28af7714c59c05c8"
},
{
"url": "https://git.kernel.org/stable/c/dfea32dd76f390e3155177b0038cc47b01386198"
},
{
"url": "https://git.kernel.org/stable/c/80f48523a0fe42db2e7375dff4e38a25c117090a"
},
{
"url": "https://git.kernel.org/stable/c/546221b86ceeba0d8fec92d46a0604bb7b62be07"
},
{
"url": "https://git.kernel.org/stable/c/09e722030e8148ba4ed1e42c6b2ea57bda9f9895"
},
{
"url": "https://git.kernel.org/stable/c/4ba5bf7ed50f235ea4581de8e7a0002f4ed287b0"
},
{
"url": "https://git.kernel.org/stable/c/6201cd1d70f1670c5b31ac506e7ab2fa7b8e7f75"
},
{
"url": "https://git.kernel.org/stable/c/bd0e9289e2642f6a5c54faad304ce0f41e926d22"
}
],
"title": "sctp: prevent peer transport count overflow",
"x_generator": {
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}
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},
"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-74469",
"datePublished": "2026-08-15T12:27:06.873Z",
"dateReserved": "2026-08-15T05:44:03.902Z",
"dateUpdated": "2026-08-19T16:37:15.198Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-74469",
"date": "2026-10-01",
"epss": "0.01083",
"percentile": "0.63935"
},
"microsoft_vex": {
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"cve": "CVE-2026-74469",
"id": "msrc_CVE-2026-74469",
"initial_release_date": "2026-08-23T14:54:23.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "sctp: prevent peer transport count overflow",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74469.json",
"version": "3"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/sctp/associola.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
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{
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"versionType": "git"
},
{
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]
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{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"version": "4.7"
},
{
"lessThan": "4.7",
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"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.151",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.103",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.18.44",
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},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: prevent peer transport count overflow\n\nsctp_assoc_add_peer() increments the association\u0027s 16-bit transport_count\nfor every new unique peer. Adding the 65,536th transport wraps the count to\nzero.\n\nSCTP sock_diag uses transport_count to reserve the INET_DIAG_PEERS payload,\nthen copies one sockaddr_storage for every entry in transport_addr_list.\nAfter the wrap, a diagnostic dump reserves an empty payload and writes\n8 MiB of peer addresses past the skb tail.\n\nReject a new unique peer when transport_count has reached U16_MAX. Perform\nthe check after the existing-peer lookup so a duplicate address continues\nto return its existing transport at the limit."
}
],
"id": "CVE-2026-74469",
"lastModified": "2026-08-19T17:21:03.977",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-08-15T13:17:51.623",
"references": [
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"url": "https://git.kernel.org/stable/c/09e722030e8148ba4ed1e42c6b2ea57bda9f9895"
},
{
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"url": "https://git.kernel.org/stable/c/4ba5bf7ed50f235ea4581de8e7a0002f4ed287b0"
},
{
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"url": "https://git.kernel.org/stable/c/546221b86ceeba0d8fec92d46a0604bb7b62be07"
},
{
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"url": "https://git.kernel.org/stable/c/6201cd1d70f1670c5b31ac506e7ab2fa7b8e7f75"
},
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},
{
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"url": "https://git.kernel.org/stable/c/b453e00da1211e997b82743d28af7714c59c05c8"
},
{
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"url": "https://git.kernel.org/stable/c/bd0e9289e2642f6a5c54faad304ce0f41e926d22"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/dfea32dd76f390e3155177b0038cc47b01386198"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-09-30T14:45:46+00:00",
"cve": "CVE-2026-74469",
"id": "CVE-2026-74469",
"initial_release_date": "2026-08-15T00:00:00+00:00",
"product_status:fixed": "1518",
"product_status:known_affected": "234",
"product_status:known_not_affected": "14",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: sctp: prevent peer transport count overflow",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74469.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-09-19T01:49:45Z",
"cve": "CVE-2026-74469",
"id": "CVE-2026-74469",
"initial_release_date": "2026-08-15T23:52:23Z",
"product_status:known_affected": "356",
"product_status:known_not_affected": "6",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-74469",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74469.json",
"version": "9"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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