CVE-2026-45981 (GCVE-0-2026-45981)
Vulnerability from cvelistv5 – Published: 2026-05-27 12:18 – Updated: 2026-06-01 16:16
VLAI
EPSS
VEX
Title
s390/cio: Fix device lifecycle handling in css_alloc_subchannel()
Summary
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.
Severity
5.5 (Medium)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
e5dcf0025d7af58f525590ac86ac27cb44714e8d , < abb6e07f46a740cda4f07d1b561ae4eaa7a1df42
(git)
Affected: e5dcf0025d7af58f525590ac86ac27cb44714e8d , < f96c5ccf95ae5f27218c1ce2d6a3ad2d3e105424 (git) Affected: e5dcf0025d7af58f525590ac86ac27cb44714e8d , < 6715560527e343a387e4a0d2e6c401748e89fa55 (git) Affected: e5dcf0025d7af58f525590ac86ac27cb44714e8d , < c35cfbb5341ba05ad1b4476ffc3c21cc3ff8f603 (git) Affected: e5dcf0025d7af58f525590ac86ac27cb44714e8d , < f65c75b0b9b5a390bc3beadcde0a6fbc3ad118f7 (git) |
guessed | |
| Linux | Linux |
Affected:
3.10
Unaffected: 0 , < 3.10 (semver) Unaffected: 6.6.128 , ≤ 6.6.* (semver) Unaffected: 6.12.75 , ≤ 6.12.* (semver) Unaffected: 6.18.14 , ≤ 6.18.* (semver) Unaffected: 6.19.4 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
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"product": "Linux",
"programFiles": [
"drivers/s390/cio/css.c"
],
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"versionType": "git"
},
{
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],
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},
{
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"version": "7.0",
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}
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}
],
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}
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},
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"url": "https://git.kernel.org/stable/c/f96c5ccf95ae5f27218c1ce2d6a3ad2d3e105424"
},
{
"url": "https://git.kernel.org/stable/c/6715560527e343a387e4a0d2e6c401748e89fa55"
},
{
"url": "https://git.kernel.org/stable/c/c35cfbb5341ba05ad1b4476ffc3c21cc3ff8f603"
},
{
"url": "https://git.kernel.org/stable/c/f65c75b0b9b5a390bc3beadcde0a6fbc3ad118f7"
}
],
"title": "s390/cio: Fix device lifecycle handling in css_alloc_subchannel()",
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"cveId": "CVE-2026-45981",
"datePublished": "2026-05-27T12:18:39.923Z",
"dateReserved": "2026-05-13T15:03:33.090Z",
"dateUpdated": "2026-06-01T16:16:41.646Z",
"state": "PUBLISHED"
},
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"cve": "CVE-2026-45981",
"date": "2026-09-16",
"epss": "0.00126",
"percentile": "0.02657"
},
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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-28T07:40:20+00:00",
"cve": "CVE-2026-45981",
"id": "CVE-2026-45981",
"initial_release_date": "2026-05-27T00:00:00+00:00",
"product_status:known_affected": "184",
"product_status:known_not_affected": "90",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: s390/cio: Fix device lifecycle handling in css_alloc_subchannel()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45981.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-11T01:13:46Z",
"cve": "CVE-2026-45981",
"id": "CVE-2026-45981",
"initial_release_date": "2026-05-28T03:55:00Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "578",
"product_status:known_not_affected": "71",
"product_status:recommended": "273",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-45981",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-45981.json",
"version": "15"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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