{"id":"CVE-2026-89940","title":"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`","summary":"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_…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f < 6865d79fca17a80fbd60c12550ca9a5e0e20e0eb","Linux >= 3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f < 510497e31be4f241103507315a859e2085ccb081","Linux >= 3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f < 8b3e221590181a8beb3735bbabf166df02c839b5","Linux >= 3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f < f25ec4627d935dedfb5fe83bd2c2678cdcc19611","Linux 6.11"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T15:18:19.340","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89940","references":[{"url":"https://git.kernel.org/stable/c/510497e31be4f241103507315a859e2085ccb081","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6865d79fca17a80fbd60c12550ca9a5e0e20e0eb","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8b3e221590181a8beb3735bbabf166df02c839b5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f25ec4627d935dedfb5fe83bd2c2678cdcc19611","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-16T10:53:53.968Z","epss":0.00159,"epssPercentile":0.05431,"slug":"CVE-2026-89940","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":205101,"id":"CVE-2026-89940","ts":1789570705235,"field":"cvss","old":null,"new":"7.8"},{"seq":205100,"id":"CVE-2026-89940","ts":1789570705235,"field":"severity","old":"none","new":"high"}]}