s390/cio: Fix device lifecycle handling in css_alloc_subchannel()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-45981
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:15 UTC
Updated2026-06-16 02:39:43 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000240000 probability, percentile 0.069180000 (date 2026-06-04)

Problem Types: CWE-401

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e5dcf0025d7af58f525590ac86ac27cb44714e8d abb6e07f46a740cda4f07d1b561ae4eaa7a1df42 git Not specified
CNA Linux Linux affected e5dcf0025d7af58f525590ac86ac27cb44714e8d f96c5ccf95ae5f27218c1ce2d6a3ad2d3e105424 git Not specified
CNA Linux Linux affected e5dcf0025d7af58f525590ac86ac27cb44714e8d 6715560527e343a387e4a0d2e6c401748e89fa55 git Not specified
CNA Linux Linux affected e5dcf0025d7af58f525590ac86ac27cb44714e8d c35cfbb5341ba05ad1b4476ffc3c21cc3ff8f603 git Not specified
CNA Linux Linux affected e5dcf0025d7af58f525590ac86ac27cb44714e8d f65c75b0b9b5a390bc3beadcde0a6fbc3ad118f7 git Not specified
CNA Linux Linux affected 3.10 Not specified
CNA Linux Linux unaffected 3.10 semver Not specified
CNA Linux Linux unaffected 6.6.128 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.75 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.14 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.4 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f65c75b0b9b5a390bc3beadcde0a6fbc3ad118f7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f96c5ccf95ae5f27218c1ce2d6a3ad2d3e105424 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/abb6e07f46a740cda4f07d1b561ae4eaa7a1df42 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6715560527e343a387e4a0d2e6c401748e89fa55 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c35cfbb5341ba05ad1b4476ffc3c21cc3ff8f603 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2b2ad7ad4a28ffdb9f94e6d979b88a5b12b71681 MITRE git.kernel.org
git.kernel.org/stable/c/b1d4e6fb241672850296956c4d782a69363a3807 MITRE git.kernel.org
git.kernel.org/stable/c/fd295a75d828c11acfcc6869c2a12cdaaf9b7722 MITRE git.kernel.org
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