CVE-2026-81665— Corosync: corosync: heap-based buffer overflow in totempg assembly buffer during fragmented message reassembly
Quick assessment
Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
在 Corosync 的 Totem 进程组（totempg）消息重组过程中发现了一个堆缓冲区溢出漏洞。在处理分片的组播消息时，用于重组分片的缓冲区在 release 构建版本中缺少运行时边界检查。能够向集群发送精心构造的组播协议消息的邻近网络攻击者，可以利用攻击者可控的数据引发堆缓冲区溢出。这可能导致 Corosync 守护进程崩溃，从而使整个集群遭受拒绝服务攻击；在具备足够的堆破坏控制能力时，还可能被进一步利用以实现更深入的漏洞利用。
Affected Version Matrix 6
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 7 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 8 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 9 | any |
affected |
| Red Hat | Red Hat OpenShift Container Platform 4 | any |
affected |
any |
affected |
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I. Basic Information for CVE-2026-81665
Vulnerability Information
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Vulnerability Title
Corosync: corosync: heap-based buffer overflow in totempg assembly buffer during fragmented message reassembly
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | - |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 7 | - |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 | - |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 | - |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat OpenShift Container Platform 4 | - |
cpe:/a:redhat:openshift:4
|
|
| Red Hat | Red Hat OpenShift Container Platform 4 | - |
cpe:/a:redhat:openshift:4
|
|
II. Public POCs for CVE-2026-81665
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-81665 (1)
Other References for CVE-2026-81665 (1)
Same Patch Batch · Red Hat · 2026-09-04 · 6 CVEs total
| CVE-2026-85197 | 7.6 HIGH | Libsoup: libsoup: heap use-after-free in libsoup http/2 client on_data_read() via goaway d |
| CVE-2026-81666 | 6.5 MEDIUM | Corosync: corosync: integer overflow in check_memb_commit_token_sanity may bypass message |
| CVE-2026-85769 | 6.5 MEDIUM | Libtpms: libtpms: heap out-of-bounds read in tpm2 state unmarshalling via unchecked block_ |
| CVE-2026-85534 | 5.9 MEDIUM | Libsoup: libsoup: http/2 client crash in on_data_source_read_callback when settings initia |
| CVE-2026-76925 | 5.8 MEDIUM | Flatpak: flatpak: toctou race condition allows symlink redirection |
IV. Related Vulnerabilities
Same product: Red Hat Enterprise Linux 10
-
CVE-2026-76925
Flatpak: flatpak: toctou race condition allows symlink redir -
CVE-2026-85769
Libtpms: libtpms: heap out-of-bounds read in tpm2 state unma -
CVE-2026-85534
Libsoup: libsoup: http/2 client crash in on_data_source_read -
CVE-2026-81666
Corosync: corosync: integer overflow in check_memb_commit_to -
CVE-2026-85197
Libsoup: libsoup: heap use-after-free in libsoup http/2 clie
Same vendor: Red Hat
-
CVE-2026-76925
Flatpak: flatpak: toctou race condition allows symlink redir -
CVE-2026-85769
Libtpms: libtpms: heap out-of-bounds read in tpm2 state unma -
CVE-2026-85534
Libsoup: libsoup: http/2 client crash in on_data_source_read -
CVE-2026-81666
Corosync: corosync: integer overflow in check_memb_commit_to -
CVE-2026-85197
Libsoup: libsoup: heap use-after-free in libsoup http/2 clie
Same weakness: CWE-122
-
CVE-2026-86142
libxml2 2.15.4前 xpointer堆溢出 -
CVE-2026-57164
PJSIP: Heap overflow in the HTTP client -
CVE-2026-18341
IBM i is Affected By Buffer Overflow Vulnerability [] -
CVE-2026-83959
Substance3D - Sampler | Heap-based Buffer Overflow (CWE-122) -
CVE-2026-53720
pymonocypher: Potential heap buffer overflow on nb_blocks in
V. Comments for CVE-2026-81665
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