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CVE-2026-91203— Cockpit-files: cockpit-files: arbitrary file ownership and permission modification via symlink race condition

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.

在 中发现了缺陷。该漏洞允许本地攻击者利用时间差问题（即符号链接竞态条件，symlink race condition），在特权文件操作（如修改文件所有权或权限）过程中进行利用。通过操纵目录项并赢得该竞态条件，攻击者可以将这些操作重定向到非预期的文件。这可能导致任意文件的所有权和权限发生未授权变更，从而可能通过改变系统或应用状态，或使服务不可用，进而影响系统的完整性和可用性。

CVSS 6.0 · Medium

Possible ATT&CK Techniques 1 AI

T1069 · Permission Groups Discovery

Affected Version Matrix 2

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any unknown
Red Hat Red Hat Enterprise Linux 9 any affected
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I. Basic Information for CVE-2026-91203

Vulnerability Information
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Vulnerability Title
Cockpit-files: cockpit-files: arbitrary file ownership and permission modification via symlink race condition
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in cockpit-files. This vulnerability allows a local attacker to exploit a timing issue, known as a symlink race condition, during privileged file operations such as changing file ownership or permissions. By manipulating directory entries and winning this race, the attacker can redirect these operations to unintended files. This could lead to unauthorized changes in file ownership and permissions on arbitrary files, potentially compromising system integrity and availability by altering system or application states or rendering services unusable.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
允许符号链接跟随的竞争条件
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 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-91203

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III. Intelligence Information for CVE-2026-91203

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Vendor Advisories for CVE-2026-91203 (1)

Other References for CVE-2026-91203 (1)

Same Patch Batch · Red Hat · 2026-09-18 · 42 CVEs total

CVE-2026-93569 8.2 HIGH Io.netty/netty-codec-http2: http/1 absolute-form host mismatch is translated to http/2 :au
CVE-2026-91149 7.5 HIGH Cockpit: cockpit: denial of service via unbounded connection thread spawning
CVE-2026-93565 7.5 HIGH Io.netty/netty-codec-http: netty rtspdecoder method-token smuggling via trailing control b
CVE-2026-93564 7.5 HIGH Io.netty/netty-codec-haproxy: netty: haproxy proxy-v2 nested-tlv grandchild bytebuf refere
CVE-2026-93567 7.5 HIGH Io.netty/netty-codec-http2: http/1 authority-form connect is translated to malformed http/
CVE-2026-93558 7.5 HIGH Io.netty/netty-codec-http: netty: unbounded per-connection queue growth in websocketserver
CVE-2026-93576 7.5 HIGH Io.netty/netty-codec-smtp: netty netty-codec-smtp — smtp command-name field is not crlf-va
CVE-2026-93568 7.5 HIGH Io.netty/netty-codec-http2: io.netty/netty-codec-http3: netty: http/2 and http/3 extended
CVE-2026-93560 7.5 HIGH Io.netty/netty-codec-stomp: netty: stomp codec content-length long-to-int truncation cause
CVE-2026-93491 7.5 HIGH Io.netty/netty-codec-http: netty: denial of service via unbounded httpservercodec http/1.1
CVE-2026-93488 7.5 HIGH Io.netty/netty-codec-http: netty: denial of service via unbounded concurrent spdy streams
CVE-2026-93563 7.5 HIGH Io.netty/netty-codec-smtp: netty: unbounded multi-line response accumulation in smtprespon
CVE-2026-93572 7.5 HIGH Io.netty/netty-codec-redis: netty: redisarrayaggregator nested resp headers multiply patch
CVE-2026-93575 7.5 HIGH Io.netty/netty-codec-mqtt: netty: resource exhaustion in mqttdecoder
CVE-2026-87743 7.5 HIGH Quarkus-vertx-http: authorization bypass via path normalization discrepancy in quarkus htt
CVE-2026-93494 7.5 HIGH Io.netty/netty-codec-stomp: netty: bytebuf leak in stompsubframedecoder when a frame body
CVE-2026-89059 7.5 HIGH Resteasy-core: resteasy: iioimageprovider unbounded image decode (decompression-bomb dos)
CVE-2026-89058 7.4 HIGH Resteasy-core: resteasy: corsfilter reflects arbitrary origin with credentials under wildc
CVE-2026-81627 6.7 MEDIUM Qemu-kvm: vapic writable rom alias can escape the option-rom window and expose locked smra
CVE-2026-93566 6.5 MEDIUM Io.netty/netty-codec-http: netty: http request smuggling due to control characters in the

Showing top 20 of 42 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-363

V. Comments for CVE-2026-91203

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