RHSA-2026:15980

Vulnerability from csaf_redhat - Published: 2026-05-11 12:26 - Updated: 2026-07-16 12:43
Summary
Red Hat Security Advisory: rhc security update
Severity
Important
Notes
Topic: An update for rhc is now available for Red Hat Enterprise Linux 8. 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: rhc is a client tool and daemon that connects the system to Red Hat hosted services enabling system and subscription management. Security Fix(es): * golang: internal/syscall/unix: Root.Chmod can follow symlinks out of the root (CVE-2026-32282) * crypto/tls: golang: Go crypto/tls: Denial of Service via multiple TLS 1.3 key update messages (CVE-2026-32283) * crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building (CVE-2026-32280) 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.
CVE-2026-32280

A flaw was found in the Go standard library packages `crypto/x509` and `crypto/tls`. During the process of building a certificate chain, an attacker can provide a large number of intermediate certificates. This excessive input is not properly limited, leading to an uncontrolled amount of work being performed. This can result in a denial of service (DoS) condition, making the affected system or application unavailable to legitimate users.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-770 - Allocation of Resources Without Limits or Throttling
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-7.el8_10.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-7.el8_10.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-7.el8_10.s390x —
Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-7.el8_10.src —
Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-7.el8_10.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-7.el8_10.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-7.el8_10.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-7.el8_10.s390x —
Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-7.el8_10.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-7.el8_10.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-7.el8_10.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-7.el8_10.s390x —
Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-7.el8_10.x86_64 —
Vendor Fix fix
Threats
Impact Important
CVE-2026-32282

A flaw was found in the internal/syscall/unix package in the Go standard library. If the target of the `Root.Chmod` function is replaced with a symbolic link during execution, specifically after `Root.Chmod` checks the target but before acting, the `chmod` operation will be performed on the file the symbolic link points to. This issue can bypass directory restrictions and lead to unauthorized permission changes on the filesystem.

7.8 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-7.el8_10.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-7.el8_10.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-7.el8_10.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-7.el8_10.src —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-7.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-7.el8_10.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-7.el8_10.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-7.el8_10.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-7.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-7.el8_10.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-7.el8_10.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-7.el8_10.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-7.el8_10.x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Moderate
CVE-2026-32283

A flaw was found in the `crypto/tls` package within the Go (golang) standard library, specifically affecting TLS 1.3 connections. A remote attacker can exploit this vulnerability by sending multiple key update messages in a single record after the handshake. This can cause the connection to deadlock, leading to uncontrolled consumption of resources and ultimately a denial of service (DoS).

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-764 - Multiple Locks of a Critical Resource
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-7.el8_10.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-7.el8_10.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-7.el8_10.s390x —
Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-7.el8_10.src —
Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-7.el8_10.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-7.el8_10.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-7.el8_10.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-7.el8_10.s390x —
Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-7.el8_10.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-7.el8_10.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-7.el8_10.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-7.el8_10.s390x —
Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-7.el8_10.x86_64 —
Vendor Fix fix
Threats
Impact Important
References
To clipboard 

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          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
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          "details": "Moderate"
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      ],
      "title": "golang: internal/syscall/unix: Root.Chmod can follow symlinks out of the root"
    },
    {
      "cve": "CVE-2026-32283",
      "cwe": {
        "id": "CWE-764",
        "name": "Multiple Locks of a Critical Resource"
      },
      "discovery_date": "2026-04-08T02:01:16.213799+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2456338"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the `crypto/tls` package within the Go (golang) standard library, specifically affecting TLS 1.3 connections. A remote attacker can exploit this vulnerability by sending multiple key update messages in a single record after the handshake. This can cause the connection to deadlock, leading to uncontrolled consumption of resources and ultimately a denial of service (DoS).",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "crypto/tls: golang: Go crypto/tls: Denial of Service via multiple TLS 1.3 key update messages",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Important: A flaw in the Go `crypto/tls` package allows a remote attacker to cause a denial of service in applications using TLS 1.3. By sending multiple key update messages in a single record post-handshake, an attacker can trigger a connection deadlock, leading to uncontrolled resource consumption. This impacts Red Hat products utilizing the affected Go standard library for TLS 1.3 connections.",
          "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": [
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          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-32283"
        },
        {
          "category": "external",
          "summary": "RHBZ#2456338",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2456338"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-32283",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-32283"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-32283",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-32283"
        },
        {
          "category": "external",
          "summary": "https://go.dev/cl/763767",
          "url": "https://go.dev/cl/763767"
        },
        {
          "category": "external",
          "summary": "https://go.dev/issue/78334",
          "url": "https://go.dev/issue/78334"
        },
        {
          "category": "external",
          "summary": "https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU",
          "url": "https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU"
        },
        {
          "category": "external",
          "summary": "https://pkg.go.dev/vuln/GO-2026-4870",
          "url": "https://pkg.go.dev/vuln/GO-2026-4870"
        }
      ],
      "release_date": "2026-04-08T01:06:57.670000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-05-11T12:26:50+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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      "title": "crypto/tls: golang: Go crypto/tls: Denial of Service via multiple TLS 1.3 key update messages"
    }
  ]
}



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Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.