CVE-2026-89092— glibc nscd 堆溢出漏洞
一分钟漏洞结论
影响对象
The GNU C Library glibc
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
自 GNU C 库 2.3.4 起，nscd 服务可能在恶意 DNS 服务器返回过大的 DNS 查询响应时，因栈溢出（stack overflow）而导致崩溃，从而导致系统的 DNS 解析性能下降。 利用此漏洞需要系统启用 nscd 服务，并使用不受信任的 DNS 服务器进行域名解析，且该受控 DNS 服务器能够处理足够大的记录，从而在 nscd 线程栈中引发栈溢出。在实验过程中，BIND 9 无法处理大记录，但未来版本或其他名称服务器可能会改变这一情况。在典型安装中，nscd 作为独立用户运行在隔离的环境中，且无
可能的 ATT&CK 技术 1 AI
T1210 · Exploitation of Remote Services影响版本矩阵 1
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| The GNU C Library | glibc | 2.3.4< 2.45 |
affected |
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一、 漏洞 CVE-2026-89092 基础信息
漏洞信息
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Vulnerability Title
Stack overflow in nscd due to unbounded alloca use
来源: CVE Program / CVE List V5
Vulnerability Description
The nscd service in the GNU C Library 2.3.4 onwards may crash due to a
stack overflow when a malicious DNS server returns too large a response
for a DNS query, resulting in degraded DNS resolution for the system.
Exploitation of this bug needs a system that has nscd enabled and using
an untrusted DNS server for name resolution, with the compromised DNS
server being capable of processing records large enough to result in a
stack overflow in an nscd thread stack. During experimentation, bind 9
was unable to handle large records, but that could change in future or
with a different name server. In typical installations, nscd is
executed in an isolated context as its own user without a shell, due to
which any compromise of that service is isolated.
There is a remote possibility of nscd cache corruption if an attacker
manages to get the stack pointer into a desired point in the heap,
potentially resulting in other caches in nscd being overwritten with
corrupt data through the stack overflow, until the buggy code path
eventually results in a crash.
Finally, a crash in nscd may result in performance degradation when
resolving names, but it does not result in a denial of service.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
来源: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
来源: CVE Program / CVE List V5
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| The GNU C Library | glibc | 2.3.4 ~ 2.45 | - |
|
二、漏洞 CVE-2026-89092 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-89092 厂商安全公告 (1)
-
🔗 Making sure you're not a bot! vendor-advisory
CVE-2026-89092 其他参考 (1)
-
🔗 Making sure you're not a bot! issue-tracking
IV. Related Vulnerabilities
V. Comments for CVE-2026-89092
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