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CVE-2026-91151— Cockpit: cockpit: local privilege escalation via insecure symlink handling in public key addition helper

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.

Cockpit 中存在一个安全漏洞。拥有目标账户主目录控制权的本地已认证用户，可利用 辅助脚本中的特权符号链接解析漏洞。当该辅助脚本以 elevated privileges（提升的特权）运行时，可被诱导去解析攻击者控制的、位于 或 路径中的恶意符号链接。这使得攻击者能够任意修改文件的所有权和权限模式，可能导致本地权限提升，进而影响系统的完整性、机密性和可用性。

CVSS 7.3 · High

Possible ATT&CK Techniques 1 AI

T1548.001 · Setuid and Setgid

Affected Version Matrix 7

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 7 any affected
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
Red Hat Red Hat OpenShift Dev Spaces any affected
any affected
any affected
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I. Basic Information for CVE-2026-91151

Vulnerability Information
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Vulnerability Title
Cockpit: cockpit: local privilege escalation via insecure symlink handling in public key addition helper
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in Cockpit. A local authenticated user with control over a target account's home directory can exploit a privileged symlink dereference vulnerability in the `ssh-add-public-key.sh` helper. When this helper runs with elevated privileges, it can be tricked into following attacker-controlled symlinks within the `.ssh` or `authorized_keys` paths. This allows the attacker to arbitrarily change file ownership and modes, potentially leading to local privilege escalation and impacting the integrity, confidentiality, and availability of the system.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/a:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:rhel_els:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/a:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/a:redhat:enterprise_linux:9
Red Hat Red Hat OpenShift Dev Spaces - cpe:/a:redhat:openshift_devspaces:3
Red Hat Red Hat OpenShift Dev Spaces - cpe:/a:redhat:openshift_devspaces:3
Red Hat Red Hat OpenShift Dev Spaces - cpe:/a:redhat:openshift_devspaces:3

II. Public POCs for CVE-2026-91151

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III. Intelligence Information for CVE-2026-91151

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Other References for CVE-2026-91151 (4)

Same Patch Batch · Red Hat · 2026-11-11 · 16 CVEs total

CVE-2026-110697 9.9 CRITICAL Quay: quay: sql like wildcard injection in robot listing leaks cross-tenant robot tokens
CVE-2026-123710 9.8 CRITICAL Quay: red hat quay: unauthenticated registry signing-key takeover via service key rotation
CVE-2026-108472 7.8 HIGH Xfsprogs: xfsprogs: local privilege escalation via command injection in xfs_admin
CVE-2026-124741 7.6 HIGH Busybox: stack buffer overflow in udhcpc6 send_d6_renew() and send_d6_release()
CVE-2026-91150 7.5 HIGH Cockpit: cockpit: denial of service via unbounded fragmented websocket messages
CVE-2026-124739 7.5 HIGH Busybox: httpd stack buffer overflow via an "i:" rule in a subdirectory httpd.conf
CVE-2026-124737 7.5 HIGH Busybox: heap buffer overflow in the tftp client on fallback to the default block size
CVE-2026-116468 6.6 MEDIUM Keycloak-services: keycloak-services: delegated admin escalates to realm-admin via group m
CVE-2026-124744 6.3 MEDIUM Busybox: cpio hardlink target not sanitized under feature_path_traversal_protection
CVE-2026-124745 6.3 MEDIUM Busybox: tar deferred hardlink target resolved through a deferred symlink escapes the extr
CVE-2026-124746 5.5 MEDIUM Busybox: out-of-bounds read in volume_id_get_buffer() via an offset+length wraparound
CVE-2026-124743 5.5 MEDIUM Busybox: divide-by-zero and heap over-read in the volume_id hfs+ prober
CVE-2026-124742 5.5 MEDIUM Busybox: divide-by-zero in the volume_id fat prober via a zero sectors_per_cluster value
CVE-2026-124738 5.3 MEDIUM Busybox: httpd password rule bypass for pre-compressed .gz files via accept-encoding: gzip
CVE-2026-124740 4.3 MEDIUM Busybox: use-after-free of requested_ipv6 in udhcpc6

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-59