CVE-2026-104036— Sssd: sssd: denial of service via out-of-bounds write in nfs idmap plugin
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.
发现 SSSD（System Security Services Daemon）的 NFS idmap 插件存在一个缺陷。当检索缓存的用户名或组名时，该插件能够检测到条目是否超出目标缓冲区的大小，但在复制数据之前未能中止操作。本地攻击者可以通过发起身份查找请求，使这些请求解析为过大的缓存条目，从而触发此漏洞，导致越界写入。该缺陷主要会导致身份映射服务崩溃，从而造成拒绝服务（DoS），同时还可能破坏相邻的进程内存。
Possible ATT&CK Techniques 2 AI
T1068 · Exploitation for Privilege Escalation T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-104036
Vulnerability Information
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Vulnerability Title
Sssd: sssd: denial of service via out-of-bounds write in nfs idmap plugin
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in SSSD's NFS idmap plugin. When retrieving cached user or group names, the plugin detects if an entry exceeds the destination buffer size but fails to abort before copying data. A local attacker can trigger this vulnerability by requesting identity lookups that resolve to oversized cached entries, resulting in an out-of-bounds write. This flaw primarily leads to a Denial of Service (DoS) by crashing the identity mapping service, and may also corrupt adjacent process memory.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
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-2026-104036
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-104036 (2)
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🔗 2479057 – (CVE-2026-104036) CVE-2026-104036 sssd: sssd: Denial of service via out-of-bounds write in NFS idmap plugin Read full article issue-tracking x_refsource_REDHAT
Same Patch Batch · Red Hat · 2026-10-06 · 16 CVEs total
| CVE-2026-92821 | 6.8 MEDIUM | Sssd: sssd: access control bypass via premature ldap access rule evaluation |
| CVE-2026-104044 | 6.2 MEDIUM | Sssd: sssd: denial of service via crafted passkey kerberos authentication request |
| CVE-2026-104038 | 5.9 MEDIUM | Sssd: sssd: denial of service via missing sid extension in certificate mapping |
| CVE-2026-104043 | 5.5 MEDIUM | Sssd: sssd: denial of service via undersized packet parsing in nss responder |
| CVE-2026-104042 | 5.5 MEDIUM | Sssd: sssd: denial of service via out-of-bounds read in pam responder |
| CVE-2026-104041 | 5.5 MEDIUM | Sssd: sssd: denial of service via unbounded negative cache growth |
| CVE-2026-104037 | 5.5 MEDIUM | Sssd: sssd: denial of service via packet length underflow in autofs responder |
| CVE-2026-104035 | 5.5 MEDIUM | Sssd: sssd: denial of service via memory exhaustion in kcm responder |
| CVE-2026-104032 | 5.5 MEDIUM | Sssd: sssd: denial of service via unprivileged autofs cache invalidation |
| CVE-2026-104031 | 5.5 MEDIUM | Sssd: sssd: denial of service via memory exhaustion in autofs responder |
| CVE-2026-105305 | 5.4 MEDIUM | Keycloak-services: keycloak-services: device authorization grant bypasses per-client minim |
| CVE-2026-104033 | 5.4 MEDIUM | Sssd: sssd: access control bypass via improper ldap shadow expiration check |
| CVE-2026-104039 | 4.7 MEDIUM | Sssd: sssd: denial of service via stale connection state reuse in pam gssapi responder |
| CVE-2026-104034 | 4.7 MEDIUM | Sssd: sssd: denial of service via use-after-free in kcm ticket renewal |
| CVE-2026-104040 | 4.4 MEDIUM | Sssd: sssd: information disclosure via odata injection in entra id lookups |
IV. Related Vulnerabilities
Same product: Red Hat Enterprise Linux 10
-
CVE-2026-104044
Sssd: sssd: denial of service via crafted passkey kerberos a -
CVE-2026-104043
Sssd: sssd: denial of service via undersized packet parsing -
CVE-2026-104042
Sssd: sssd: denial of service via out-of-bounds read in pam -
CVE-2026-104041
Sssd: sssd: denial of service via unbounded negative cache g -
CVE-2026-104040
Sssd: sssd: information disclosure via odata injection in en
Same vendor: Red Hat
-
CVE-2026-105305
Keycloak-services: keycloak-services: device authorization g -
CVE-2026-104044
Sssd: sssd: denial of service via crafted passkey kerberos a -
CVE-2026-104043
Sssd: sssd: denial of service via undersized packet parsing -
CVE-2026-104042
Sssd: sssd: denial of service via out-of-bounds read in pam -
CVE-2026-104041
Sssd: sssd: denial of service via unbounded negative cache g
V. Comments for CVE-2026-104036
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