{"id":"CVE-2026-45981","state":"PUBLISHED","title":"s390/cio: Fix device lifecycle handling in css_alloc_subchannel()","description":"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_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.","publishedAt":"2026-05-27T12:18:39.923Z","updatedAt":"2026-06-01T16:16:41.646Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e5dcf0025d7af58f525590ac86ac27cb44714e8d","status":"affected","lessThan":"abb6e07f46a740cda4f07d1b561ae4eaa7a1df42","versionType":"git"},{"version":"e5dcf0025d7af58f525590ac86ac27cb44714e8d","status":"affected","lessThan":"f96c5ccf95ae5f27218c1ce2d6a3ad2d3e105424","versionType":"git"},{"version":"e5dcf0025d7af58f525590ac86ac27cb44714e8d","status":"affected","lessThan":"6715560527e343a387e4a0d2e6c401748e89fa55","versionType":"git"},{"version":"e5dcf0025d7af58f525590ac86ac27cb44714e8d","status":"affected","lessThan":"c35cfbb5341ba05ad1b4476ffc3c21cc3ff8f603","versionType":"git"},{"version":"e5dcf0025d7af58f525590ac86ac27cb44714e8d","status":"affected","lessThan":"f65c75b0b9b5a390bc3beadcde0a6fbc3ad118f7","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/s390/cio/css.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.10","versionType":"semver"},{"version":"6.6.128","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.75","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.14","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.4","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/s390/cio/css.c"]}],"references":["https://git.kernel.org/stable/c/abb6e07f46a740cda4f07d1b561ae4eaa7a1df42","https://git.kernel.org/stable/c/f96c5ccf95ae5f27218c1ce2d6a3ad2d3e105424","https://git.kernel.org/stable/c/6715560527e343a387e4a0d2e6c401748e89fa55","https://git.kernel.org/stable/c/c35cfbb5341ba05ad1b4476ffc3c21cc3ff8f603","https://git.kernel.org/stable/c/f65c75b0b9b5a390bc3beadcde0a6fbc3ad118f7"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/45xxx/CVE-2026-45981.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-45981","state":"PUBLISHED","datePublished":"2026-05-27T12:18:39.923Z","dateUpdated":"2026-06-01T16:16:41.646Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-13T15:03:33.090Z"},"containers":{"cna":{"title":"s390/cio: Fix device lifecycle handling in css_alloc_subchannel()","descriptions":[{"lang":"en","value":"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_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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e5dcf0025d7af58f525590ac86ac27cb44714e8d","status":"affected","lessThan":"abb6e07f46a740cda4f07d1b561ae4eaa7a1df42","versionType":"git"},{"version":"e5dcf0025d7af58f525590ac86ac27cb44714e8d","status":"affected","lessThan":"f96c5ccf95ae5f27218c1ce2d6a3ad2d3e105424","versionType":"git"},{"version":"e5dcf0025d7af58f525590ac86ac27cb44714e8d","status":"affected","lessThan":"6715560527e343a387e4a0d2e6c401748e89fa55","versionType":"git"},{"version":"e5dcf0025d7af58f525590ac86ac27cb44714e8d","status":"affected","lessThan":"c35cfbb5341ba05ad1b4476ffc3c21cc3ff8f603","versionType":"git"},{"version":"e5dcf0025d7af58f525590ac86ac27cb44714e8d","status":"affected","lessThan":"f65c75b0b9b5a390bc3beadcde0a6fbc3ad118f7","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/s390/cio/css.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.10","versionType":"semver"},{"version":"6.6.128","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.75","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.14","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.4","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/s390/cio/css.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-06-01T16:16:41.646Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"6.6.128"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"6.12.75"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"6.18.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"6.19.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}