PT-2026-61224 · Linux · Linux
CVE-2026-63907
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Publicado
2026-07-19
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Atualizado
2026-07-19
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In the Linux kernel, the following vulnerability has been resolved:
uio: uio pci generic sva: fix double free of devm kzalloc() memory
uio pci sva allocates struct uio pci sva dev with devm kzalloc() in
probe(), but then calls kfree(udev) both on the probe() error path
(label out free) and again in remove().
Because devm kzalloc() allocations are devres-managed and are freed
automatically when the device is detached (including after a failing
probe() and during driver unbind), the explicit kfree() can lead to a
double free.
If probe() fails after devm kzalloc(), the error path frees udev and
devres cleanup will free it again when the core unwinds the partially
bound device. On normal driver removal, remove() frees udev and devres
will free it again when the device is detached.
This issue was identified by a static analysis tool I developed and
confirmed by manual review. Fix by removing the manual kfree() calls
and dropping the now-unused label.
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