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Linux KernelOperating system · Linux

CVE-2025-39715

MEDIUM · 5.5 CVSS v3.1 Published 2025-09-05
Fix available
A fix is available. Upgrade to 6.1.149 / 6.6.103 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: parisc: Revise gateway LWS calls to probe user read access We use load and stbys,e instructions to trigger memory reference interruptions without writing to memory. Because of the way read access support is implemented, read access interruptions are only triggered at privilege levels 2 and 3. The kernel and gateway page execute at privilege level 0, so this code never triggers a read access interruption. Thus, it is currently possible for user code to execute a LWS compare and swap operation at an address that is read protected at privilege level 3 (PRIV_USER). Fix this by probing read access rights at privilege level 3 and branching to lws_fault if access isn't allowed.

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:>= 5.17, < 6.1.149>= 6.2, < 6.6.103>= 6.7, < 6.12.44>= 6.13, < 6.16.4
Debian LinuxOperating system
Affected:= 11.0

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 6.1.149 / 6.6.103 / 6.12.44 or later
Fixed in 6.1.1496.6.1036.12.44
Vendor patch git.kernel.org →
Recommended fix High confidence

Linux Kernel 6.1.149+, 6.6.103+, 6.12.44+, or 6.16.4+ (depending on which branch is in use); Debian 12 for Debian-based systems

  1. Identify the currently running Linux kernel version using `uname -r`
  2. Determine which kernel branch (6.1, 6.6, 6.7, 6.12, or 6.13) is applicable to your system
  3. Upgrade the Linux kernel to a fixed version: 6.1.149 or later for 6.1.y, 6.6.103 or later for 6.6.y, 6.12.44 or later for 6.7-6.12, or 6.16.4 or later for 6.13.y
  4. For Debian 11 (bullseye) systems, apply Debian security updates or upgrade to Debian 12 which includes a newer kernel
  5. Reboot the system after kernel upgrade to load the patched kernel
  6. Verify the fix is applied by checking the kernel version matches a fixed release
Caveat Kernel upgrades may require rebuilding third-party kernel modules; ensure compatibility with system hardware and software stack 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-2025-39715 in production — separate from our analysis above.

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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
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