CVE-2026-18938— P11-kit: integer overflow in rpc attribute-array length calculation can under-allocate nested attribute storage on 32 bit systems
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.
P11-glue p11-kit是P11-glue团队的一个提供PKCS#11模块加载与共享的加密组件。 P11-glue p11-kit存在缓冲区错误漏洞，该漏洞源于整数溢出，导致系统错误计算嵌套属性的内存分配，进而造成堆越界写入，可能使本地攻击者或可访问RPC通道的攻击者通过发送特制消息导致p11-kit RPC解析进程崩溃，造成拒绝服务。该漏洞仅在32位系统上可利用。
Affected Version Matrix 7
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 6 | any |
unaffected |
| Red Hat | Red Hat Enterprise Linux 7 | any |
unaffected |
| Red Hat | Red Hat Enterprise Linux 8 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 9 | any |
affected |
| Red Hat | Red Hat Hardened Images | any |
affected |
| Red Hat | Red Hat OpenShift Container Platform 4 | any |
unaffected |
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I. Basic Information for CVE-2026-18938
Vulnerability Information
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Vulnerability Title
P11-kit: integer overflow in rpc attribute-array length calculation can under-allocate nested attribute storage on 32 bit systems
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in p11-kit. A local attacker, or one with equivalent access to a reachable RPC channel, could exploit an integer overflow vulnerability. By sending specially crafted messages, the attacker can cause the system to miscalculate memory allocation for nested attributes. This leads to a memory corruption issue, specifically a heap out-of-bounds write, which can crash the p11-kit RPC parsing process, resulting in a Denial of Service (DoS). This vulnerability is only exploitable on 32 bit systems.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
P11-glue p11-kit 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
P11-glue p11-kit是P11-glue团队的一个提供PKCS#11模块加载与共享的加密组件。 P11-glue p11-kit存在缓冲区错误漏洞，该漏洞源于整数溢出，导致系统错误计算嵌套属性的内存分配，进而造成堆越界写入，可能使本地攻击者或可访问RPC通道的攻击者通过发送特制消息导致p11-kit RPC解析进程崩溃，造成拒绝服务。该漏洞仅在32位系统上可利用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
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 6 | - |
cpe:/o:redhat:enterprise_linux:6
|
|
| 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 Hardened Images | - |
cpe:/a:redhat:hummingbird:1
|
|
| Red Hat | Red Hat OpenShift Container Platform 4 | - |
cpe:/a:redhat:openshift:4
|
|
II. Public POCs for CVE-2026-18938
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-18938 (2)
Same Patch Batch · Red Hat · 2026-08-07 · 4 CVEs total
| CVE-2026-15816 | 7.5 HIGH | Dracut: dracut: root code execution via unescaped error message written to sourced emergen |
| CVE-2026-19079 | 4.4 MEDIUM | Policycoreutils: policycoreutils: toctou race condition in fixfiles allows arbitrary selin |
| CVE-2026-61477 | 2.3 LOW | Libvirt: libvirt: newline injection in network xml dns txt/srv fields allows dnsmasq confi |
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