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CVE-2026-99277

ksmbd: hold a connection reference for each session channel

CVSS score

—

EPSS probability

—

Risk score

—

Published

4 h ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Patch status has not yet been verified

Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.

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Vulnerability description

DayBreach AI Explanation

Verified against sources

Linux kernel ksmbd session channel reference vulnerability

Sources read

2

Source agreement

Tam uyum

Evidence confidence

%63

Short explanation

The ksmbd module in the Linux kernel has a connection reference management issue during ksmbd_session_unregister() due to how sessions are removed from tables while concurrent reference holders keep them alive. This can cause a connection to be freed while another session reference holder is still accessing it.

Why does it matter?

The premature freeing of connections while active access is ongoing can lead to memory integrity issues or instability within the Linux kernel.

What should be done?

  • Taking a connection reference when registering a channel
  • Releasing the reference on insertion failure, channel removal, or final session destruction
  • Following vendor advisories and reviewing provided stable git references
Chain of evidence and sources3 verified claims

ksmbd_session_unregister() oturumu tablolardan çıkarırken eşzamanlı başvuru tutucular oturumu canlı tutabilmektedir.

S0 · daybreach-canonicalS1 · cvelistS2 · nvd

Kanal yalnızca ham bir bağlantı işaretçisi sakladığından, başka bir oturum başvuru sahibi erişirken bağlantı serbest bırakılabilir.

S0 · daybreach-canonicalS1 · cvelistS2 · nvd

Yama durumu resmî kaynaklarda incelenmiş ancak CONFIDENCE değeri sıfır olarak belirlenmiştir.

S0 · daybreach-canonical
Show the technical text from the sources

In the Linux kernel, the following vulnerability has been resolved: ksmbd: hold a connection reference for each session channel ksmbd_session_unregister() removes a session from the global and per- connection tables before dropping the table reference. A concurrent reference holder can keep the session and its channel list alive after those removals. Connection cleanup can no longer find the unpublished session to remove its channels. Since a channel only stores a raw conn pointer, the connection can be freed while another session reference holder is still accessing it, for example during SMB3.1.1 binding or a procfs read. Take a connection reference when registering a channel and release it on insertion failure, channel removal, or final session destruction. Keep the channels and signing keys until the session is destroyed so a response can still be signed after the session has been unregistered.

This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-99277 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1linuxLinux View
2linuxLinux View
Total affected vendors: 1|Products: 2

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
The sources have not yet published a verified CVSS metric.

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-99277 is associated with the following CWEs:

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')CWE-20: Improper Input Validation

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-99277 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Official Sources and Advisories

https://git.kernel.org/stable/c/4b333aed69cfc2c8687b86b6a4364a0dffc16dd8vendor-advisoryhttps://git.kernel.org/stable/c/add8d7fb04efe564193df73581889c62fc0016f1vendor-advisory

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

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CVE-2026-99277 · ksmbd: hold a connection reference for each…