{"id":"CVE-2026-89940","published":"2026-09-16T11:17:03.610","lastModified":"2026-09-16T15:18:19.340","description":"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.","cvssScore":7.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/510497e31be4f241103507315a859e2085ccb081","tags":[]},{"url":"https://git.kernel.org/stable/c/6865d79fca17a80fbd60c12550ca9a5e0e20e0eb","tags":[]},{"url":"https://git.kernel.org/stable/c/8b3e221590181a8beb3735bbabf166df02c839b5","tags":[]},{"url":"https://git.kernel.org/stable/c/f25ec4627d935dedfb5fe83bd2c2678cdcc19611","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"The vulnerability in the Linux kernel allows a use-after-free condition due to the improper management of lock lifetimes in the `iio_dma_fence` implementation, which can lead to potential security issues if exploited.","exploitability":"Exploitation requires low privileges and specific conditions, making it moderately difficult. The attacker must have access to the affected system and be able to trigger the use-after-free condition.","blast_radius":"If exploited, the vulnerability could lead to high impact, including data corruption, system instability, or even remote code execution, depending on the context and system configuration.","remediation":"Upgrade to the latest version of the Linux kernel that includes the fix, such as 'Upgrade to 6.1.10 or later'.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["kernel","use-after-free","low-privilege","system-stability"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-10-08T08:43:02.240Z"}}