Vulnerability-Lookup

alsa-2026:22963

Vulnerability from osv_almalinux

Published

2026-06-03 00:00

Modified

2026-06-04 10:07

Summary

Critical: samba security update

Details

Samba is an open-source implementation of the Server Message Block (SMB) protocol and the related Common Internet File System (CIFS) protocol, which allow PC-compatible machines to share files, printers, and various information.

Security Fix(es):

samba: Missing access check on reparse point operations (CVE-2026-1933)
samba: vfs_worm does not block directory modification (CVE-2026-2340)
samba: group policy certificate enrollment uses http:// without validation (CVE-2026-3012)
samba: Samba: Remote Code Execution in printing subsystem via unescaped job description (CVE-2026-4480)
ngtcp2: ngtcp2: Denial of service via stack buffer overflow during QUIC handshake (CVE-2026-40170)
samba: Remote Code Execution in SAMR (CVE-2026-4408)

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.

References

URL

Type

	https://access.redhat.com/errata/RHSA-2026:22963	ADVISORY
	https://access.redhat.com/security/cve/CVE-2026-1933	REPORT
	https://access.redhat.com/security/cve/CVE-2026-2340	REPORT
	https://access.redhat.com/security/cve/CVE-2026-3012	REPORT
	https://access.redhat.com/security/cve/CVE-2026-40170	REPORT
	https://access.redhat.com/security/cve/CVE-2026-4408	REPORT
	https://access.redhat.com/security/cve/CVE-2026-4480	REPORT
	https://bugzilla.redhat.com/2447317	REPORT
	https://bugzilla.redhat.com/2447318	REPORT
	https://bugzilla.redhat.com/2447319	REPORT
	https://bugzilla.redhat.com/2452232	REPORT
	https://bugzilla.redhat.com/2459061	REPORT
	https://bugzilla.redhat.com/2479762	REPORT
	https://errata.almalinux.org/10/ALSA-2026-22963.html	ADVISORY

JSON

To clipboard

{
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      "package": {
        "ecosystem": "AlmaLinux:10",
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      },
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            }
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          "type": "ECOSYSTEM"
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    {
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        "name": "samba-winbind-modules"
      },
      "ranges": [
        {
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            },
            {
              "fixed": "4.23.5-109.el10_2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:10",
        "name": "samba-winexe"
      },
      "ranges": [
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            {
              "introduced": "0"
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            }
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          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "Samba is an open-source implementation of the Server Message Block (SMB) protocol and the related Common Internet File System (CIFS) protocol, which allow PC-compatible machines to share files, printers, and various information.  \n\nSecurity Fix(es):  \n\n  * samba: Missing access check on reparse point operations (CVE-2026-1933)\n  * samba: vfs_worm does not block directory modification (CVE-2026-2340)\n  * samba: group policy certificate enrollment uses \u003chttp://\u003e without validation (CVE-2026-3012)\n  * samba: Samba: Remote Code Execution in printing subsystem via unescaped job description (CVE-2026-4480)\n  * ngtcp2: ngtcp2: Denial of service via stack buffer overflow during QUIC handshake (CVE-2026-40170)\n  * samba: Remote Code Execution in SAMR (CVE-2026-4408)\n\n\nFor 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.\n",
  "id": "ALSA-2026:22963",
  "modified": "2026-06-04T10:07:02Z",
  "published": "2026-06-03T00:00:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:22963"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-1933"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-2340"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-3012"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-40170"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-4408"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-4480"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2447317"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2447318"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2447319"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2452232"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2459061"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2479762"
    },
    {
      "type": "ADVISORY",
      "url": "https://errata.almalinux.org/10/ALSA-2026-22963.html"
    }
  ],
  "related": [
    "CVE-2026-1933",
    "CVE-2026-2340",
    "CVE-2026-3012",
    "CVE-2026-4480",
    "CVE-2026-40170",
    "CVE-2026-4408"
  ],
  "summary": "Critical: samba security update"
}

CVE-2026-1933 (GCVE-0-2026-1933)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:28 – Updated: 2026-06-03 23:47

Title

Samba: missing access check on reparse point operations

Summary

A flaw was found in Samba’s handling of NTFS-style reparse points on shares configured with read only = yes. Due to missing SMB-layer access checks, authenticated users with underlying filesystem write permissions may create or delete reparse point metadata through SMB operations even on read-only exports. This could allow modification of SMB-visible file behavior, including converting files into symbolic links or other reparse point types.

Severity

7.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-284 - Improper Access Control

Assigner

redhat

References

4 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:22963	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-1933	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2447317	issue-trackingx_refsource_REDHAT
https://bugzilla.samba.org/show_bug.cgi?id=15992

Impacted products

6 products

Vendor	Product	Version
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:4.23.5-109.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
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

Date Public

2026-05-27 12:08

Credits

Red Hat would like to thank Asim Viladi Oglu Manizada for reporting this issue.

Show details on NVD website

JSON

To clipboard

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CVE-2026-2340 (GCVE-0-2026-2340)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:09 – Updated: 2026-06-04 00:08

Title

Samba: vfs_worm does not block directory modification

Summary

A flaw was found in Samba’s vfs_worm module. The module is intended to provide write-once, read-many (WORM) protections by preventing modification of files after a configurable grace period. Due to insufficient validation during rename operations, an authenticated user with write access to a share could overwrite a protected file by renaming a newly created file over the existing WORM-protected file.

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-280 - Improper Handling of Insufficient Permissions or Privileges

Assigner

redhat

References

4 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:22963	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-2340	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2447318	issue-trackingx_refsource_REDHAT
https://bugzilla.samba.org/show_bug.cgi?id=15997

Impacted products

6 products

Vendor	Product	Version
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:4.23.5-109.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
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

Date Public

2026-05-27 10:35

Credits

Red Hat would like to thank Pavel Kohout (Aisle Research) for reporting this issue.

Show details on NVD website

JSON

To clipboard

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CVE-2026-3012 (GCVE-0-2026-3012)

Vulnerability from cvelistv5 – Published: 2026-05-27 10:02 – Updated: 2026-06-03 23:47

Title

Samba: group policy certificate enrollment uses http:// without validation

Summary

A flaw was found in Samba’s certificate auto-enrollment Group Policy handling. When certificate auto-enrollment is enabled, Samba may retrieve a CA certificate over an unencrypted HTTP connection and install it into the local trust store without proper verification. An attacker with the ability to intercept or redirect network traffic could exploit this behavior to supply a malicious certificate authority certificate, potentially allowing interception or spoofing of trusted communications.

Severity

8 (High)


                        
                          CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-345 - Insufficient Verification of Data Authenticity

Assigner

redhat

References

5 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:22644	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22963	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-3012	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2447319	issue-trackingx_refsource_REDHAT
https://bugzilla.samba.org/show_bug.cgi?id=16003

Impacted products

6 products

Vendor	Product	Version
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:4.23.5-109.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 0:4.19.4-16.el8_10 , < * (rpm) cpe:/a:redhat:enterprise_linux:8::appstream cpe:/a:redhat:enterprise_linux:8::crb cpe:/o:redhat:enterprise_linux:8::baseos
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 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat OpenShift Container Platform 4	cpe:/a:redhat:openshift:4

Date Public

2026-05-27 09:17

Credits

Red Hat would like to thank Arad Inbar (DREAM Security Research Team), Ben Grinberg (DREAM Security Research Team), Michalis Vasileiadis, and Nir Somech (DREAM Security Research Team) for reporting this issue.

Show details on NVD website

JSON

To clipboard

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CVE-2026-40170 (GCVE-0-2026-40170)

Vulnerability from cvelistv5 – Published: 2026-04-16 21:34 – Updated: 2026-04-20 15:00

Title

ngtcp2 has a qlog transport parameter serialization stack buffer overflow

Summary

ngtcp2 is a C implementation of the IETF QUIC protocol. In versions prior to 1.22.1, ngtcp2_qlog_parameters_set_transport_params() serializes peer transport parameters into a fixed 1024-byte stack buffer without bounds checking. When qlog is enabled, a remote peer can send sufficiently large transport parameters during the QUIC handshake to cause writes beyond the buffer boundary, resulting in a stack buffer overflow. This affects deployments that enable the qlog callback and process untrusted peer transport parameters. This issue has been fixed in version 1.22.1. If developers are unable to immediately upgrade, they can disable the qlog on client.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-121 - Stack-based Buffer Overflow

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/ngtcp2/ngtcp2/security/advisor…	x_refsource_CONFIRM
https://github.com/ngtcp2/ngtcp2/commit/708a7640c…	x_refsource_MISC
http://www.openwall.com/lists/oss-security/2026/0…

Impacted products

1 product

Vendor	Product	Version
ngtcp2	ngtcp2	Affected: < 1.22.1

Show details on NVD website

JSON

To clipboard

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CVE-2026-4408 (GCVE-0-2026-4408)

Vulnerability from cvelistv5 – Published: 2026-05-28 07:25 – Updated: 2026-06-03 23:48

Title

Samba: remote code execution in samr

Summary

A flaw was found in Samba. A remote attacker can exploit a misconfiguration in Samba file servers and classic domain controllers that use the "check password script" feature. If this script is configured with the %u substitution character, the client-controlled username is passed without proper escaping of shell meta-characters. This vulnerability allows an attacker to achieve remote command execution on the affected system. This issue primarily affects non-standard configurations where the "check password script" is used with %u and the samba-dcerpcd service is started as a system service.

Severity

9 (Critical)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Assigner

redhat

References

5 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:22644	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22963	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-4408	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2479762	issue-trackingx_refsource_REDHAT
https://bugzilla.samba.org/show_bug.cgi?id=16034

Impacted products

6 products

Vendor	Product	Version
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:4.23.5-109.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 0:4.19.4-16.el8_10 , < * (rpm) cpe:/a:redhat:enterprise_linux:8::appstream cpe:/a:redhat:enterprise_linux:8::crb cpe:/o:redhat:enterprise_linux:8::baseos
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 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat OpenShift Container Platform 4	cpe:/a:redhat:openshift:4

Date Public

2026-05-26 00:00

Credits

Red Hat would like to thank John Walker (ZeroPath) and Ron Ben Yizhak (SafeBreach) for reporting this issue.

Show details on NVD website

JSON

To clipboard

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CVE-2026-4480 (GCVE-0-2026-4480)

Vulnerability from cvelistv5 – Published: 2026-05-26 13:56 – Updated: 2026-06-03 23:48

Title

Samba: samba: remote code execution in printing subsystem via unescaped job description

Summary

A flaw was found in the Samba printing subsystem. Samba passes the client-controlled job description string to the command configured with the "print command" setting via the "%J" substitution character without escaping shell meta characters. A remote attacker could exploit this vulnerability by sending a specially crafted print job description that contains unescaped shell characters. This could lead to remote code execution on the affected system.

Severity

9 (Critical)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Assigner

redhat

References

5 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:22644	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22963	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-4480	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2452232	issue-trackingx_refsource_REDHAT
https://bugzilla.samba.org/show_bug.cgi?id=16033

Impacted products

6 products

Vendor	Product	Version
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:4.23.5-109.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 0:4.19.4-16.el8_10 , < * (rpm) cpe:/a:redhat:enterprise_linux:8::appstream cpe:/a:redhat:enterprise_linux:8::crb cpe:/o:redhat:enterprise_linux:8::baseos
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 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat OpenShift Container Platform 4	cpe:/a:redhat:openshift:4

Date Public

2026-05-26 13:43

Credits

Red Hat would like to thank Arjun Basnet (Securin Labs), John Walker (ZeroPath), and Ron Ben Yizhak (SafeBreach) for reporting this issue.

Show details on NVD website

JSON

To clipboard

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          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
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          "packageName": "samba",
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          "cpes": [
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          "cpes": [
            "cpe:/o:redhat:enterprise_linux:7"
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          "packageName": "samba",
          "product": "Red Hat Enterprise Linux 7",
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          "packageName": "rhcos",
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      ],
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  "cveMetadata": {
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    "dateReserved": "2026-03-19T21:17:35.193Z",
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}

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.

Action not permitted

alsa-2026:22963

Vulnerability from osv_almalinux

CVE-2026-1933 (GCVE-0-2026-1933)

CVE-2026-2340 (GCVE-0-2026-2340)

CVE-2026-3012 (GCVE-0-2026-3012)

CVE-2026-40170 (GCVE-0-2026-40170)

CVE-2026-4408 (GCVE-0-2026-4408)

CVE-2026-4480 (GCVE-0-2026-4480)

Tags

Sightings

Nomenclature