RHSA-2026:99600
Vulnerability from csaf_redhat - Published: 2026-11-12 11:44 - Updated: 2026-11-12 17:25Summary
Red Hat Security Advisory: cockpit security update
Severity
Important
Notes
Topic: An update for cockpit is now available for Red Hat Enterprise Linux 10.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Cockpit enables users to administer GNU/Linux servers using a web browser. It offers network configuration, log inspection, diagnostic reports, SELinux troubleshooting, interactive command-line sessions, and more.
Security Fix(es):
* cockpit: Cockpit: Local privilege escalation via insecure symlink handling in public key addition helper (CVE-2026-91151)
* cockpit: cockpit: Denial of Service via unbounded fragmented WebSocket messages (CVE-2026-91150)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in Cockpit. This vulnerability allows a remote attacker, without prior authentication, to send specially crafted fragmented WebSocket messages. These messages accumulate without a total-size limit, leading to unbounded memory exhaustion and a denial of service in the `cockpit-ws` service.
7.5 (High)
Affected products
Fixed
26 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.3.Z:cockpit-packagekit-0:366.1.1-1.el10_3.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.3.Z:cockpit-storaged-0:366.1.1-1.el10_3.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-0:366.1.1-1.el10_3.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-0:366.1.1-1.el10_3.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-0:366.1.1-1.el10_3.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-0:366.1.1-1.el10_3.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-0:366.1.1-1.el10_3.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-bridge-0:366.1.1-1.el10_3.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-debuginfo-0:366.1.1-1.el10_3.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-debuginfo-0:366.1.1-1.el10_3.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-debuginfo-0:366.1.1-1.el10_3.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-debuginfo-0:366.1.1-1.el10_3.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-debugsource-0:366.1.1-1.el10_3.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-debugsource-0:366.1.1-1.el10_3.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-debugsource-0:366.1.1-1.el10_3.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-debugsource-0:366.1.1-1.el10_3.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-doc-0:366.1.1-1.el10_3.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-system-0:366.1.1-1.el10_3.noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-ws-0:366.1.1-1.el10_3.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-ws-0:366.1.1-1.el10_3.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-ws-0:366.1.1-1.el10_3.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-ws-0:366.1.1-1.el10_3.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-ws-selinux-0:366.1.1-1.el10_3.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-ws-selinux-0:366.1.1-1.el10_3.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-ws-selinux-0:366.1.1-1.el10_3.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: BaseOS-10.3.Z:cockpit-ws-selinux-0:366.1.1-1.el10_3.x86_64 | — |
Vendor Fix
fix
|
Threats
Impact
Important
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.
7.3 (High)
Affected products
Fixed
26 products, the same list as for
CVE-2026-91150
Threats
Impact
Important
References
16 references
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}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "cockpit: cockpit: Denial of Service via unbounded fragmented WebSocket messages"
},
{
"acknowledgments": [
{
"summary": "This issue was discovered by Red Hat."
}
],
"cve": "CVE-2026-91151",
"cwe": {
"id": "CWE-59",
"name": "Improper Link Resolution Before File Access"
},
"discovery_date": "2026-05-18T03:32:25+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2478404"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Cockpit. A local authenticated user with control over a target account\u0027s 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.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "cockpit: Cockpit: Local privilege escalation via insecure symlink handling in public key addition helper",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Important flaw in Cockpit\u0027s `ssh-add-public-key.sh` helper allows a local authenticated user to escalate privileges. By manipulating symlinks within their home directory, an attacker can redirect privileged filesystem operations performed by the helper during the \"Add public key\" workflow in a privileged Cockpit session. This can lead to arbitrary ownership and mode changes on sensitive files, resulting in integrity, confidentiality, and availability impacts. Exploitation requires user interaction and a privileged execution context, preventing unauthenticated or remote attacks.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-91151"
},
{
"category": "external",
"summary": "RHBZ#2478404",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2478404"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-91151",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-91151"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-91151",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91151"
},
{
"category": "external",
"summary": "https://github.com/cockpit-project/cockpit/commit/4796b28be064a90e32262cec85be7839e6198e23",
"url": "https://github.com/cockpit-project/cockpit/commit/4796b28be064a90e32262cec85be7839e6198e23"
},
{
"category": "external",
"summary": "https://github.com/cockpit-project/cockpit/releases/tag/372",
"url": "https://github.com/cockpit-project/cockpit/releases/tag/372"
}
],
"release_date": "2026-11-10T23:59:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-11-12T11:44:48+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"restart_required": {
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"url": "https://access.redhat.com/errata/RHSA-2026:99600"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.3,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "cockpit: Cockpit: Local privilege escalation via insecure symlink handling in public key addition helper"
}
]
}
Loading…
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.