Answer in brief
CVE-2025-68209 records a Unknown severity vulnerability in mlx5: Fix default values in create CQ. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=cdd04f4d4d71cbf93d0d9abe63bc838f47c467fa <1a7865e3e4de2830d8a9fe8c273dc10b248b7338 || >=cdd04f4d4d71cbf93d0d9abe63bc838f47c467fa <a39d334c9840705af69f0466f8f0129c366004ca || >=cdd04f4d4d71cbf93d0d9abe63bc838f47c467fa <08469f5393a1a39f26a6e2eb2e8c33187665c1f4 || >=cdd04f4d4d71cbf93d0d9abe63bc838f47c467fa <e5eba42f01340f73888dfe560be2806057c25913 | 1a7865e3e4de2830d8a9fe8c273dc10b248b7338, a39d334c9840705af69f0466f8f0129c366004ca, 08469f5393a1a39f26a6e2eb2e8c33187665c1f4, e5eba42f01340f73888dfe560be2806057c25913 |
| Linux/Linuxgeneric | 6.0 | Not reported |
Published upstream
Dec 16, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 21, 2026
In the Linux kernel, the following vulnerability has been resolved: mlx5: Fix default values in create CQ Currently, CQs without a completion function are assigned the mlx5_add_cq_to_tasklet function by default. This is problematic since only user CQs created through the mlx5_ib driver are intended to use this function. Additionally, all CQs that will use doorbells instead of polling for completions must call mlx5_cq_arm. However, the default CQ creation flow leaves a valid value in the CQ's arm_db field, allowing FW to send interrupts to polling-only CQs in certain corner cases. These two factors would allow a polling-only kernel CQ to be triggered by an EQ interrupt and call a completion function intended only for user CQs, causing a null pointer exception. Some areas in the driver have prevented this issue with one-off fixes but did not address the root cause. This patch fixes the described issue by adding defaults to the create CQ flow. It adds a default dummy completion function to protect against null pointer exceptions, and it sets an invalid command sequence number by default in kernel CQs to prevent the FW from sending an interrupt to the CQ until it is armed. User CQs are responsible for their own initialization values. Callers of mlx5_core_create_cq are responsible for changing the completion function and arming the CQ per their needs.
Quoted source text, attributed separately from HOL analysis.