CVE-2026-46058

Summary

In the Linux kernel, the following vulnerability has been resolved:

media: amphion: Fix race between m2m job_abort and device_run

Fix kernel panic caused by race condition where v4l2_m2m_ctx_release() frees m2m_ctx while v4l2_m2m_try_run() is about to call device_run with the same context.

Race sequence: v4l2_m2m_try_run(): v4l2_m2m_ctx_release(): lock/unlock v4l2_m2m_cancel_job() job_abort() v4l2_m2m_job_finish() kfree(m2m_ctx) <- frees ctx device_run() <- use-after-free crash at 0x538

Crash trace: Unable to handle kernel read from unreadable memory at virtual address 0000000000000538 v4l2_m2m_try_run+0x78/0x138 v4l2_m2m_device_run_work+0x14/0x20

The amphion vpu driver does not rely on the m2m framework's device_run callback to perform encode/decode operations.

Fix the race by preventing m2m framework job scheduling entirely:

• Add job_ready callback returning 0 (no jobs ready for m2m framework)
• Remove job_abort callback to avoid the race condition

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/516467052fdfc6a13eadc70d43420ae57436bf3c
• https://git.kernel.org/stable/c/42dc622776f3ce1a6c31b13bdc686f7295e3b323
• https://git.kernel.org/stable/c/da4f46c5cf1d26e6b09418ad453e152f2e75a02c
• https://git.kernel.org/stable/c/fdc150dac1adb9a98be9d6956cff0348838b024a
• https://git.kernel.org/stable/c/6be2cb75bc1300080cfc8051579f22efae9401f7
• https://git.kernel.org/stable/c/8cd35ceadcfc8c5da2eb7f7ce24525ce9d4ee62e

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