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Linux KernelOperating system · Linux

CVE-2025-39810

HIGH · 7.8 CVSS v3.1 Published 2025-09-16
Fix available
A fix is available. Upgrade to 6.12.45 / 6.16.5 or later.
See remediation →
80/100
Remediation priority · High
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: bnxt_en: Fix memory corruption when FW resources change during ifdown bnxt_set_dflt_rings() assumes that it is always called before any TC has been created. So it doesn't take bp->num_tc into account and assumes that it is always 0 or 1. In the FW resource or capability change scenario, the FW will return flags in bnxt_hwrm_if_change() that will cause the driver to reinitialize and call bnxt_cancel_reservations(). This will lead to bnxt_init_dflt_ring_mode() calling bnxt_set_dflt_rings() and bp->num_tc may be greater than 1. This will cause bp->tx_ring[] to be sized too small and cause memory corruption in bnxt_alloc_cp_rings(). Fix it by properly scaling the TX rings by bp->num_tc in the code paths mentioned above. Add 2 helper functions to determine bp->tx_nr_rings and bp->tx_nr_rings_per_tc.

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
How this class of weakness works · CWE-787

The program writes past the bounds of a buffer, overwriting adjacent memory an attacker can turn to their advantage. Crafted input can overwrite control data and redirect execution. Remediation is validating every index and length before a write, plus modern memory-safety mitigations.

General guidance for the out-of-bounds write class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

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:>= 5.4, < 6.12.45>= 6.13, < 6.16.5= 6.17

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
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 6.12.45 / 6.16.5 or later
Fixed in 6.12.456.16.5
Vendor patch git.kernel.org →
Recommended fix High confidence

Kernel 6.12.45 or later for 6.12.x; Kernel 6.16.5 or later for 6.13-6.15.x; Kernel 6.18 or later for 6.17.x

  1. Identify the currently running Linux kernel version using `uname -r`
  2. Check if the running kernel version falls within the affected range: 5.4 to < 6.12.45, 6.13 to < 6.16.5, or exactly 6.17
  3. Schedule a maintenance window for kernel update (this requires system reboot)
  4. Upgrade the Linux kernel to version 6.12.45 or later (for systems on 6.12.x branch)
  5. Upgrade the Linux kernel to version 6.16.5 or later (for systems on 6.13-6.15.x branch)
  6. For systems running 6.17.x, monitor for 6.18 or subsequent stable releases that include the fix
  7. After reboot, verify the new kernel version is loaded using `uname -r`
  8. Confirm the bnxt_en driver is loaded without errors using `lsmod | grep bnxt` and check dmesg for any driver-related errors
Caveat Kernel upgrades may introduce changes to driver APIs, filesystem compatibility, or remove support for older hardware; ensure application compatibility testing is performed before production deployment

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 $3,200. 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-2025-39810 in production — separate from our analysis above.

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What this is

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  • Version or environment caveats, and links to real fixes
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