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NVD / CVE Program· CNA redhat

CVE-2026-15779: Samba-winbind: samba: pam_winbind mkhomedir chowns critical system paths without validation

Noroxi assessment

Priority: Monitor (action score 24/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.10% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: samba (openSUSE:Leap 16.0) 4.22.11+git.552.66cfeb7de0a-160000.1.1, 4.22.9+git.538.af6cb4fb2e-160000.1.1; samba (SUSE:Enterprise Storage 7.1) 4.15.13+git.808.eeca19f5e1-150300.3.106.1; samba (SUSE:Linux Enterprise High Availability Extension 12 SP5) 4.15.13+git.729.a8ce057e8d-3.109.1.

Low priority for now. Upgrade to samba (openSUSE:Leap 16.0) 4.22.11+git.552.66cfeb7de0a-160000.1.1, 4.22.9+git.538.af6cb4fb2e-160000.1.1; samba (SUSE:Enterprise Storage 7.1) 4.15.13+git.808.eeca19f5e1-150300.3.106.1; samba (SUSE:Linux Enterprise High Availability Extension 12 SP5) 4.15.13+git.729.a8ce057e8d-3.109.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A flaw was found in samba's pam_winbind. When mkhomedir is enabled, pam_winbind chowns the target account's home directory without validating the path is not a critical system directory such as /. On affected systems, accounts with / as their home directory (a common default for system accounts) can have this triggered not only by root, but by a non-root user holding a narrow sudo delegation to run commands as that account, causing ownership of / to change and resulting in severe denial of service (SSH, sudo, and package-manager failures). The change does not grant write access to / (which ships with restrictive 0555 permissions on RHEL), so the impact is availability loss rather than further privilege escalation.

MediumCVSS 6.1 · v3.1—No exploit Fix available
Published
Jul 15, 2026
Updated
Nov 5, 2026
EPSS
0.1% · 1th percentile

Report tools

JSON

Action score

24

Monitor

Low priority for now.

CVSS
24 / 40 · 6.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
6.1
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat Enterprise Linux 10

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 8

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 9

    • all versionsaffected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12sambafrom 0—
openSUSE:Leap 16.0sambabefore 4.22.11+git.552.66cfeb7de0a-160000.1.14.22.11+git.552.66cfeb7de0a-160000.1.1
openSUSE:Leap 16.0sambabefore 4.22.9+git.538.af6cb4fb2e-160000.1.14.22.9+git.538.af6cb4fb2e-160000.1.1
SUSE:Enterprise Storage 7.1sambabefore 4.15.13+git.808.eeca19f5e1-150300.3.106.14.15.13+git.808.eeca19f5e1-150300.3.106.1
SUSE:Linux Enterprise High Availability Extension 12 SP5sambabefore 4.15.13+git.729.a8ce057e8d-3.109.14.15.13+git.729.a8ce057e8d-3.109.1
SUSE:Linux Enterprise High Availability Extension 15 SP6sambabefore 4.19.8+git.501.67274891bc-150600.3.29.14.19.8+git.501.67274891bc-150600.3.29.1
SUSE:Linux Enterprise Micro 5.3sambabefore 4.15.13+git.808.eeca19f5e1-150400.3.52.14.15.13+git.808.eeca19f5e1-150400.3.52.1
SUSE:Linux Enterprise Micro 5.5sambabefore 4.17.12+git.581.f49579c6cd-150500.3.42.14.17.12+git.581.f49579c6cd-150500.3.42.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7sambabefore 4.21.10+git.533.31d7e5508d-150700.3.29.14.21.10+git.533.31d7e5508d-150700.3.29.1
SUSE:Linux Micro 6.2sambabefore 4.22.9+git.538.af6cb4fb2e-160000.1.14.22.9+git.538.af6cb4fb2e-160000.1.1
SUSE:Linux Micro 6.2sambabefore 4.22.11+git.552.66cfeb7de0a-160000.1.14.22.11+git.552.66cfeb7de0a-160000.1.1

Same product

red hat: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-10230Samba: command injection in wins server hook script
    52Plan
  • CVE-2026-4631Cockpit: cockpit: unauthenticated remote code execution due to ssh command-line argument injection
    44Plan
  • CVE-2026-76578Ipa: freeipa: freeipa: unauthenticated ldap client can obtain administrator credentials via the self-managed-token aci
    39Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-15713Jul 14, 2026 · Libsoup: soupcache: libsoup: http/2 frame window exhaustion remote denial of service via memory leak
    23Monitor
  • ← EarlierCVE-2026-15714Jul 14, 2026 · Libsoup: soupmultipartinputstream: libsoup: out-of-bounds read in soup_multipart_input_stream_read_headers via an oversized multipart boundary string
    26Monitor
  • Later →CVE-2026-3842Jul 15, 2026 · Qemu-kvm: hyperv/syndbg: missing mapped-length guard after cpu_physical_memory_map causes host oob write
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
opensuse:samba4.22.9+git.538.af6cb4fb2e-160000.1.1 · openSUSE:Leap 16.0Package registry (OSV)
suse:samba4.22.9+git.538.af6cb4fb2e-160000.1.1 · SUSE:Linux Micro 6.2Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-8482857 days apartPcs: pcs: non-root haclient users can read arbitrary files via pcs host auth --token
    26Monitor
  • CVE-2026-6856315 days apartAnsible-collection-redhat-leapp: ansible-collection-redhat-leapp: information disclosure of postgresql data via insecure backup permissions
    22Monitor
  • CVE-2026-6362326 days apartLibvirt: information disclosure via world-readable storage volume images during clone/convert
    22Monitor
  • CVE-2026-684284 days apartNano: nano: local attacker can inject malicious .desktop launcher due to insecure directory permissions
    10Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
low · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
Low
Availability impact
High

Weakness class (CWE)

CWE-732 · Incorrect Permission Assignment for Critical Resource

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records