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In the Linux kernel, the following vulnerability has been resolved:
auxdisplay: line-display: fix NULL dereference in linedisp_release
linedisp_release() currently retrieves the enclosing struct linedisp via to_linedisp(). That lookup depends on the attachment list, but the attachment may already have been removed before put_device() invokes the release callback. This can happen in linedisp_unregister(), and can also be reached from some linedisp_register() error paths.
In that case, to_linedisp() returns NULL and linedisp_release() dereferences it while freeing the display resources.
The struct device released here is the embedded linedisp->dev used by linedisp_register(), so retrieve the enclosing object directly with container_of() instead.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Ubuntu | — | Upgrade linux-nvidia | May 25, 2026 | May 1, 2026 |
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