Answer in brief
CVE-2026-45981 records a Unknown severity vulnerability in s390/cio: Fix device lifecycle handling in css_alloc_subchannel(). 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 | >=e5dcf0025d7af58f525590ac86ac27cb44714e8d <abb6e07f46a740cda4f07d1b561ae4eaa7a1df42 || >=e5dcf0025d7af58f525590ac86ac27cb44714e8d <f96c5ccf95ae5f27218c1ce2d6a3ad2d3e105424 || >=e5dcf0025d7af58f525590ac86ac27cb44714e8d <6715560527e343a387e4a0d2e6c401748e89fa55 || >=e5dcf0025d7af58f525590ac86ac27cb44714e8d <c35cfbb5341ba05ad1b4476ffc3c21cc3ff8f603 || >=e5dcf0025d7af58f525590ac86ac27cb44714e8d <f65c75b0b9b5a390bc3beadcde0a6fbc3ad118f7 | abb6e07f46a740cda4f07d1b561ae4eaa7a1df42, f96c5ccf95ae5f27218c1ce2d6a3ad2d3e105424, 6715560527e343a387e4a0d2e6c401748e89fa55, c35cfbb5341ba05ad1b4476ffc3c21cc3ff8f603, f65c75b0b9b5a390bc3beadcde0a6fbc3ad118f7 |
| Linux/Linuxgeneric | 3.10 | Not reported |
Published upstream
May 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 6, 2026
In the Linux kernel, the following vulnerability has been resolved: s390/cio: Fix device lifecycle handling in css_alloc_subchannel() `css_alloc_subchannel()` calls `device_initialize()` before setting up the DMA masks. If `dma_set_coherent_mask()` or `dma_set_mask()` fails, the error path frees the subchannel structure directly, bypassing the device model reference counting. Once `device_initialize()` has been called, the embedded struct device must be released via `put_device()`, allowing the release callback to free the container structure. Fix the error path by dropping the initial device reference with `put_device()` instead of calling `kfree()` directly. This ensures correct device lifetime handling and avoids potential use-after-free or double-free issues.
Quoted source text, attributed separately from HOL analysis.