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CVE-2026-58218— Samba: dns signing dos via tkey name cache exhaustion

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.

Samba是Samba组织开源的一个适用于 Linux 和 Unix 的标准 Windows 互操作性程序套件。 Samba存在资源管理错误漏洞，该漏洞源于内部DNS服务器中未经验证的TKEY注册请求在拒绝前被添加到TKEY名称缓存，导致远程未认证攻击者可通过发送大量TKEY请求耗尽缓存并驱逐合法条目，从而阻止合法TSIG认证，造成拒绝服务。

CVSS 5.3 · Medium EPSS 0.78% · P54

Affected Version Matrix 7

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any unknown
Red Hat Red Hat Enterprise Linux 6 any unknown
any unknown
Red Hat Red Hat Enterprise Linux 7 any unknown
Red Hat Red Hat Enterprise Linux 8 any unknown
Red Hat Red Hat Enterprise Linux 9 any unknown
Red Hat Red Hat OpenShift Container Platform 4 any unknown
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I. Basic Information for CVE-2026-58218

Vulnerability Information
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Vulnerability Title
Samba: dns signing dos via tkey name cache exhaustion
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in Samba's internal DNS server where unauthenticated TKEY registration requests were added to the TKEY name cache before being rejected. A remote, unauthenticated attacker can exploit this behavior by sending a large number of TKEY requests with arbitrary names, exhausting the cache and evicting legitimate TKEY entries. This can prevent legitimate TSIG authentication for signed DNS queries, resulting in a denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的资源池
Source: CVE Program / CVE List V5
Vulnerability Title
Samba 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Samba是Samba组织开源的一个适用于 Linux 和 Unix 的标准 Windows 互操作性程序套件。 Samba存在资源管理错误漏洞，该漏洞源于内部DNS服务器中未经验证的TKEY注册请求在拒绝前被添加到TKEY名称缓存，导致远程未认证攻击者可通过发送大量TKEY请求耗尽缓存并驱逐合法条目，从而阻止合法TSIG认证，造成拒绝服务。
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 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 OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-58218

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III. Intelligence Information for CVE-2026-58218

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Patches & Fixes for CVE-2026-58218 (1)

Vendor Advisories for CVE-2026-58218 (3)

Same Patch Batch · Red Hat · 2026-07-30 · 15 CVEs total

CVE-2026-16526 8.8 HIGH Pcp: pcp: privilege escalation to root via linux_sockets pmda vulnerability
CVE-2026-58222 8.8 HIGH Samba: samba ad ldap compare filter injection and trusted-request confusion disclose prote
CVE-2026-16524 7.8 HIGH Pcp: pcp linux_sockets pmda: arbitrary command execution via command injection
CVE-2026-18381 7.6 HIGH Project-koku/koku-metrics-operator: koku-metrics-operator: operator service-account token
CVE-2026-18378 7.6 HIGH Project-koku/koku-metrics-operator: koku-metrics-operator: cluster pull-secret token exfil
CVE-2026-16529 7.5 HIGH Pcp: pcp: denial of service due to signed integer overflow
CVE-2026-16527 7.3 HIGH Pcp: pcp pmproxy: unauthenticated access to /store endpoint allows bypassing pmcd access r
CVE-2026-18382 6.8 MEDIUM Project-koku/koku-metrics-operator: koku-metrics-operator: service-account client credenti
CVE-2026-16530 6.5 MEDIUM Pcp: pcp: remote denial of service and information leakage
CVE-2026-68562 6.2 MEDIUM Ansible-collection-redhat-leapp: ansible-collection-redhat-leapp: information disclosure v
CVE-2026-18369 5.8 MEDIUM Dogtag-pki: pki-core: redhat-pki: pki: acme http-01 validation ssrf via ip literal identif
CVE-2026-68563 5.5 MEDIUM Ansible-collection-redhat-leapp: ansible-collection-redhat-leapp: information disclosure o
CVE-2026-16531 5.3 MEDIUM Pcp: pcp: arbitrary file creation via path traversal in pmproxy logger servlet
CVE-2026-58216 5.3 MEDIUM Samba: kpasswd service: kpasswd packet that contains malformed asn.1 might cause the serve

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-410

V. Comments for CVE-2026-58218

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