CVE-2026-23227

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

drm/exynos: vidi: use ctx->lock to protect struct vidi_context member variables related to memory alloc/free

Exynos Virtual Display driver performs memory alloc/free operations without lock protection, which easily causes concurrency problem.

For example, use-after-free can occur in race scenario like this:

    CPU0                CPU1                CPU2
    ----                ----                ----
  vidi_connection_ioctl()
    if (vidi->connection) // true
      drm_edid = drm_edid_alloc(); // alloc drm_edid
      ...
      ctx->raw_edid = drm_edid;
      ...
                                drm_mode_getconnector()
                                  drm_helper_probe_single_connector_modes()
                                    vidi_get_modes()
                                      if (ctx->raw_edid) // true
                                        drm_edid_dup(ctx->raw_edid);
                                          if (!drm_edid) // false
                                          ...
                vidi_connection_ioctl()
                  if (vidi->connection) // false
                    drm_edid_free(ctx->raw_edid); // free drm_edid
                    ...
                                          drm_edid_alloc(drm_edid->edid)
                                            kmemdup(edid); // UAF!!
                                            ...

To prevent these vulns, at least in vidi_context, member variables related to memory alloc/free should be protected with ctx->lock.