564 lines
25 KiB
JSON
564 lines
25 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-81665",
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"assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
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"state": "PUBLISHED",
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"assignerShortName": "redhat",
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"dateReserved": "2026-08-27T10:38:28.793Z",
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"datePublished": "2026-09-04T09:05:35.890Z",
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"dateUpdated": "2026-11-02T15:46:09.678Z"
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},
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"containers": {
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"cna": {
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"title": "Corosync: corosync: heap-based buffer overflow in totempg assembly buffer during fragmented message reassembly",
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"metrics": [
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{
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"other": {
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"content": {
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"value": "Important",
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"namespace": "https://access.redhat.com/security/updates/classification/"
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},
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"type": "Red Hat severity rating"
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}
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},
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{
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"cvssV3_1": {
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"attackComplexity": "HIGH",
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"attackVector": "ADJACENT_NETWORK",
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"availabilityImpact": "HIGH",
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"baseScore": 7.5,
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"baseSeverity": "HIGH",
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"confidentialityImpact": "HIGH",
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"integrityImpact": "HIGH",
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"privilegesRequired": "NONE",
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"scope": "UNCHANGED",
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"userInteraction": "NONE",
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"vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"version": "3.1"
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},
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"format": "CVSS"
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}
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],
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"descriptions": [
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{
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"lang": "en",
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"value": "A heap-based buffer overflow was found in Corosync's Totem Process Group (totempg) message reassembly. When processing fragmented multicast messages, the buffer used to reassemble fragments lacks a runtime bounds check in release builds. A network-adjacent attacker able to send crafted multicast protocol messages to the cluster could cause a heap buffer overflow with attacker-controlled data. This can crash the Corosync daemon, causing a denial of service to the entire cluster, and may potentially allow further exploitation given sufficient heap-corruption control."
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}
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],
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"affected": [
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{
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"vendor": "Red Hat",
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"packageName": "corosync",
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"status": "unaffected"
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{
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"references": [
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{
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"url": "https://access.redhat.com/errata/RHSA-2026:67872",
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"vendor-advisory",
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{
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"name": "RHSA-2026:67873",
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"vendor-advisory",
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"x_refsource_REDHAT"
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{
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"url": "https://access.redhat.com/errata/RHSA-2026:67878",
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"name": "RHSA-2026:67878",
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"tags": [
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"vendor-advisory",
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"x_refsource_REDHAT"
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]
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{
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"url": "https://access.redhat.com/errata/RHSA-2026:67879",
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"name": "RHSA-2026:67879",
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"tags": [
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"vendor-advisory",
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"x_refsource_REDHAT"
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]
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},
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{
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"url": "https://access.redhat.com/errata/RHSA-2026:67880",
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"name": "RHSA-2026:67880",
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"tags": [
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"vendor-advisory",
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"x_refsource_REDHAT"
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]
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},
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{
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"url": "https://access.redhat.com/errata/RHSA-2026:67881",
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"name": "RHSA-2026:67881",
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"tags": [
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"vendor-advisory",
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"x_refsource_REDHAT"
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]
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},
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{
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"url": "https://access.redhat.com/errata/RHSA-2026:68574",
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"name": "RHSA-2026:68574",
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"tags": [
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"vendor-advisory",
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"x_refsource_REDHAT"
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]
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},
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{
|
|
"url": "https://access.redhat.com/errata/RHSA-2026:69277",
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"name": "RHSA-2026:69277",
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"tags": [
|
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"vendor-advisory",
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"x_refsource_REDHAT"
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]
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},
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{
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"url": "https://access.redhat.com/errata/RHSA-2026:69278",
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"name": "RHSA-2026:69278",
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"tags": [
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"vendor-advisory",
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"x_refsource_REDHAT"
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]
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},
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{
|
|
"url": "https://access.redhat.com/errata/RHSA-2026:69279",
|
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"name": "RHSA-2026:69279",
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"tags": [
|
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"vendor-advisory",
|
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"x_refsource_REDHAT"
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]
|
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},
|
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{
|
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"url": "https://access.redhat.com/errata/RHSA-2026:69280",
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"name": "RHSA-2026:69280",
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"tags": [
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"vendor-advisory",
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"x_refsource_REDHAT"
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]
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},
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{
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"url": "https://access.redhat.com/security/cve/CVE-2026-81665",
|
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"tags": [
|
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"vdb-entry",
|
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"x_refsource_REDHAT"
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]
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},
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{
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2524910",
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"cweId": "CWE-122",
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"description": "Heap-based Buffer Overflow",
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"lang": "en",
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"value": "There is no complete mitigation for this vulnerability short of a fix, but the following steps significantly reduce risk:\n\n1. Ensure cluster message authentication is enabled in corosync.conf: set crypto_cipher to aes256 and crypto_hash to sha256 (or stronger) in the totem {} block, with a shared key generated by corosync-keygen. This is the default when clusters are configured via 'pcs cluster setup', and disabling it (cipher=none/hash=none) is an explicitly unsupported configuration per upstream maintainer guidance.\n2. Restrict network access to the cluster communication ports (default 5405-5412/UDP) to trusted cluster node addresses only, using firewalld or other firewall rules.\n3. Ensure SELinux is running in enforcing mode on cluster nodes to limit the impact of any successful exploitation."
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"time": "2026-08-23T00:00:00.000Z",
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"value": "Reported to Red Hat."
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"lang": "en",
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"value": "Red Hat would like to thank Tristan Madani (Talence Security) for reporting this issue."
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"metrics": [
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"content": {
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"timestamp": "2026-09-04T17:09:13.395902Z",
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"id": "CVE-2026-81665",
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"options": [
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"Exploitation": "none"
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"Automatable": "no"
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"title": "CISA ADP Vulnrichment",
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