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Linux KernelOperating system · Linux

CVE-2025-71150

MEDIUM · 5.5 CVSS v3.1 Published 2026-01-23
Fix available
A fix is available. Upgrade to 5.16 / 6.1.160 or later.
See remediation →
57/100
Remediation priority · Elevated
Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
In the Linux kernel, the following vulnerability has been resolved: ksmbd: Fix refcount leak when invalid session is found on session lookup When a session is found but its state is not SMB2_SESSION_VALID, It indicates that no valid session was found, but it is missing to decrement the reference count acquired by the session lookup, which results in a reference count leak. This patch fixes the issue by explicitly calling ksmbd_user_session_put to release the reference to the session.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Linux KernelOperating system
Affected:>= 5.15.176, < 5.16>= 6.1.121, < 6.1.160>= 6.6.67, < 6.6.120>= 6.12.6, < 6.12.64>= 6.13.1, < 6.18.3= 6.13= 6.19

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 5.16 / 6.1.160 / 6.6.120 or later
Fixed in 5.166.1.1606.6.120
Vendor patch git.kernel.org →
Recommended fix High confidence

Upgrade to kernel >= 5.16, >= 6.1.160, >= 6.6.120, or >= 6.12.64 (or any later stable release)

  1. 1. Check current kernel version: `uname -r`
  2. 2. For Debian/Ubuntu: Run `sudo apt update && sudo apt upgrade` or install a newer kernel package
  3. 3. For RHEL/CentOS: Run `sudo yum update kernel` or `sudo dnf update kernel`
  4. 4. For Fedora: Run `sudo dnf update kernel`
  5. 5. Reboot the system to load the new kernel: `sudo reboot`
  6. 6. Verify the new kernel version is loaded: `uname -r`
Caveat Kernel upgrades may require system reboot and could introduce unrelated regressions; verify compatibility with critical kernel modules or custom drivers before upgrading

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,600. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-71150 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data