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CVE-2026-58216— Samba: kpasswd service: kpasswd packet that contains malformed asn.1 might cause the server to access 6 bytes of unallocated memory leading server to crash

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存在缓冲区错误漏洞，该漏洞源于处理畸形ASN.1编码的Kerberos密码更改请求时，结构大小计算错误导致越界读取，可能导致KDC进程崩溃，造成拒绝服务。

CVSS 5.3 · Medium EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1499.002 · Service Exhaustion Flood

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-2026-58216

Vulnerability Information
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Vulnerability Title
Samba: kpasswd service: kpasswd packet that contains malformed asn.1 might cause the server to access 6 bytes of unallocated memory leading server to crash
Source: CVE Program / CVE List V5
Vulnerability Description
An out-of-bounds read flaw was found in Samba's Kerberos Key Distribution Center's (KDC) password change (kpasswd) service. When processing malformed ASN.1-encoded Kerberos password change request, Samba server miscalculates the structure size and attempts to read up to six bytes beyond the end of the allocated buffer. While this out-of-bounds read typically results in a harmless decryption failure, if the read hits unmapped memory, it causes the KDC process to crash. An authenticated attacker can send a specially crafted kpasswd request containing malformed ASN.1 data to trigger the out-of-bounds read, which may cause the KDC process to terminate, resulting in a denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Samba 缓冲区错误漏洞
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存在缓冲区错误漏洞，该漏洞源于处理畸形ASN.1编码的Kerberos密码更改请求时，结构大小计算错误导致越界读取，可能导致KDC进程崩溃，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-2026-58216

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III. Intelligence Information for CVE-2026-58216

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Vendor Advisories for CVE-2026-58216 (4)

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-2026-58218 5.3 MEDIUM Samba: dns signing dos via tkey name cache exhaustion

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-125

V. Comments for CVE-2026-58216

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