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CVE-2026-31584: Linux

7.8

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се локално, без особени условия, с обикновен потребителски вход и без действие от потребителя.

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: media: mediatek: vcodec: fix use-after-free in encoder release path The fops_vcodec_release() function frees the context structure (ctx) without first cancelling any pending or running work in ctx->encode_work. This creates a race window where the workqueue handler (mtk_venc_worker) may still be accessing the context memory after it has been freed. Race condition: CPU 0 (release path) CPU 1 (workqueue) --------------------- ------------------ fops_vcodec_release() v4l2_m2m_ctx_release() v4l2_m2m_cancel_job() // waits for m2m job "done" mtk_venc_worker() v4l2_m2m_job_finish() // m2m job "done" // BUT worker still running! // post-job_finish access: other ctx dereferences // UAF if ctx already freed // returns (job "done") kfree(ctx) // ctx freed Root cause: The v4l2_m2m_ctx_release() only waits for the m2m job lifecycle (via TRANS_RUNNING flag), not the workqueue lifecycle. After v4l2_m2m_job_finish() is called, the m2m framework considers the job complete and v4l2_m2m_ctx_release() returns, but the worker function continues executing and may still access ctx. The work is queued during encode operations via: queue_work(ctx->dev->encode_workqueue, &ctx->encode_work) The worker function accesses ctx->m2m_ctx, ctx->dev, and other ctx fields even after calling v4l2_m2m_job_finish(). This vulnerability was confirmed with KASAN by running an instrumented test module that widens the post-job_finish race window. KASAN detected: BUG: KASAN: slab-use-after-free in mtk_venc_worker+0x159/0x180 Read of size 4 at addr ffff88800326e000 by ta

    Засегнати продукти

    • Linux Linux: 0934d37596151edce115c6d0843a9ad7d5e5d232 преди 9a9bdaf9dc42ccca50e53f82165292f74a365c11; 0934d37596151edce115c6d0843a9ad7d5e5d232 преди a8a55913552aed45108525d1851c65e1db0cc25b; 0934d37596151edce115c6d0843a9ad7d5e5d232 преди f99353cd0e9f58bf17889049137b8d65fb44ebf1; 0934d37596151edce115c6d0843a9ad7d5e5d232 преди 93d9a58961a9e09306857e999b3ee76aa4be67f0; 0934d37596151edce115c6d0843a9ad7d5e5d232 преди f1692337c6fa26e04f89b22a4d84bf5b7ada50d1; 0934d37596151edce115c6d0843a9ad7d5e5d232 преди 76e35091ffc722ba39b303e48bc5d08abb59dd56
    • Linux Linux: 6.6; преди 6.6; 6.6.136 до 6.6.*; 6.12.83 до 6.12.*; 6.18.24 до 6.18.*; 6.19.14 до 6.19.*; 7.0.1 до 7.0.*; от 7.1 нататък

    История

    • 24 април 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-31584: Linux | freedomonline.bg