{"id":"CVE-2026-89940","summary":"iio: buffer: Tie IIO dma fence lock lifetime to the fence","details":"In the Linux kernel, the following vulnerability has been resolved:\n\niio: buffer: Tie IIO dma fence lock lifetime to the fence\n\nThe `iio_dma_fence` implementation currently uses a lock embedded in the\n`iio_dmabuf_priv`. But the `iio_dma_fence` can outlive the\n`iio_dmabuf_priv`, which can cause a use-after-free.\n\nTie the lifetime of the lock to the lifetime of the fence by embedding them\nin the same struct.\n\nWe can't just hold a reference to the `iio_dmabuf_priv` from the\n`iio_dma_fence` since `iio_buffer_dmabuf_release()` might sleep and the\nfence release callback is not allowed to sleep.\n\nNote that the `dma_fence` framework now has an internal lock that gets used\nwhen the passing `NULL` for `lock` in `dma_fence_init()`, but in order to\nallow this patch to be backportable use an external lock.","modified":"2026-09-18T03:46:28.826193442Z","published":"2026-09-16T10:32:28.395Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89940.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/510497e31be4f241103507315a859e2085ccb081"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6865d79fca17a80fbd60c12550ca9a5e0e20e0eb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8b3e221590181a8beb3735bbabf166df02c839b5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f25ec4627d935dedfb5fe83bd2c2678cdcc19611"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89940.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89940"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f"},{"fixed":"6865d79fca17a80fbd60c12550ca9a5e0e20e0eb"},{"fixed":"510497e31be4f241103507315a859e2085ccb081"},{"fixed":"8b3e221590181a8beb3735bbabf166df02c839b5"},{"fixed":"f25ec4627d935dedfb5fe83bd2c2678cdcc19611"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89940.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.11.0"},{"fixed":"6.12.110"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.51"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89940.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}