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CVE-2026-90994— Sssd: sssd: denial of service via malformed pam v1 requests

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.

sssd 中存在一个缺陷，具体位于 PAM（可插拔认证模块）响应器的协议 v1 解析器 中。拥有 PAM 响应器 UNIX 套接字访问权限的本地客户端，可以通过协商使用协议 v1 并发送一个为空或被截断的 PAM 请求体来利用此缺陷。这可能触发越界读取，导致 PAM 响应器终止或重启，从而引发本地拒绝服务（DoS）。

CVSS 4.0 · Medium
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I. Basic Information for CVE-2026-90994

Vulnerability Information
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Vulnerability Title
Sssd: sssd: denial of service via malformed pam v1 requests
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in sssd, specifically within the PAM (Pluggable Authentication Modules) responder's protocol v1 parser, pam_parse_in_data(). A local client with access to the PAM responder's UNIX socket can exploit this by negotiating protocol v1 and sending an empty or truncated PAM request body. This can trigger an out-of-bounds read, potentially causing the PAM responder to terminate or restart, leading to a local denial of service.
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:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
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 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
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-90994

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III. Intelligence Information for CVE-2026-90994

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Vendor Advisories for CVE-2026-90994 (1)

Other References for CVE-2026-90994 (1)

Same Patch Batch · Red Hat · 2026-09-14 · 7 CVEs total

CVE-2026-90947 7.8 HIGH Gimp: gimp: out-of-bounds write in lighting effects plugin via crafted preset file
CVE-2026-90949 7.8 HIGH Gimp: gimp: heap-based buffer overflow in psp loader due to selection-channel geometry mis
CVE-2026-90948 7.8 HIGH Gimp: gimp: heap-based buffer overflow in ico loader via integer overflow in embedded png
CVE-2026-90995 5.5 MEDIUM Sssd: sssd: local denial of service due to null pointer dereference in pam responder
CVE-2026-90996 4.0 MEDIUM Sssd: sssd: denial of service in nss responder via crafted zero-length requests
CVE-2026-90463 4.0 MEDIUM Sssd: local oob read in nss service request parsers (`sss_nss_protocol_parse_svc_name` / `

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-90994

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