{"id":"CVE-2026-45981","title":"s390/cio: Fix device lifecycle handling in css_alloc_subchannel()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/cio: Fix device lifecycle handling in css_alloc_subchannel()\n\n`css_alloc_subchannel()` calls `device_initialize()` before setting up\nthe DMA masks. If `dma_set_coh…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= e5dcf0025d7af58f525590ac86ac27cb44714e8d < abb6e07f46a740cda4f07d1b561ae4eaa7a1df42","Linux >= e5dcf0025d7af58f525590ac86ac27cb44714e8d < f96c5ccf95ae5f27218c1ce2d6a3ad2d3e105424","Linux >= e5dcf0025d7af58f525590ac86ac27cb44714e8d < 6715560527e343a387e4a0d2e6c401748e89fa55","Linux >= e5dcf0025d7af58f525590ac86ac27cb44714e8d < c35cfbb5341ba05ad1b4476ffc3c21cc3ff8f603","Linux >= e5dcf0025d7af58f525590ac86ac27cb44714e8d < f65c75b0b9b5a390bc3beadcde0a6fbc3ad118f7","Linux 3.10"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:03:48.168902Z"},"published":"2026-05-27","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:13:29.775Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-45981","references":[{"url":"https://git.kernel.org/stable/c/abb6e07f46a740cda4f07d1b561ae4eaa7a1df42"},{"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"}],"tags":["cve.org"],"epss":0.00126,"epssPercentile":0.02329,"ingestedAt":"2026-11-06T16:57:43.355Z","slug":"CVE-2026-45981","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ns390/cio: Fix device lifecycle handling in css_alloc_subchannel()\n\n`css_alloc_subchannel()` calls `device_initialize()` before setting up\nthe DMA masks. If `dma_set_coherent_mask()` or `dma_set_mask()` fails,\nthe error path frees the subchannel structure directly, bypassing\nthe device model reference counting.\n\nOnce `device_initialize()` has been called, the embedded struct device\nmust be released via `put_device()`, allowing the release callback to\nfree the container structure.\n\nFix the error path by dropping the initial device reference with\n`put_device()` instead of calling `kfree()` directly.\n\nThis ensures correct device lifetime handling and avoids potential\nuse-after-free or double-free issues.\n\n## Affected\n\n- `Linux >= e5dcf0025d7af58f525590ac86ac27cb44714e8d < abb6e07f46a740cda4f07d1b561ae4eaa7a1df42`\n- `Linux >= e5dcf0025d7af58f525590ac86ac27cb44714e8d < f96c5ccf95ae5f27218c1ce2d6a3ad2d3e105424`\n- `Linux >= e5dcf0025d7af58f525590ac86ac27cb44714e8d < 6715560527e343a387e4a0d2e6c401748e89fa55`\n- `Linux >= e5dcf0025d7af58f525590ac86ac27cb44714e8d < c35cfbb5341ba05ad1b4476ffc3c21cc3ff8f603`\n- `Linux >= e5dcf0025d7af58f525590ac86ac27cb44714e8d < f65c75b0b9b5a390bc3beadcde0a6fbc3ad118f7`\n- `Linux 3.10`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}