uio: uio_pci_generic_sva: fix double free of devm_kzalloc() memory

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Summary

CVECVE-2026-63907
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:08 UTC
Updated2026-07-19 16:17:08 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.001890000 probability, percentile 0.087840000 (date 2026-07-20)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3397c3cd859a2c51962ad032dcf97961d42f9db2 e344865bfca4eb37ed8d7ac5917226e49fcec7ce git Not specified
CNA Linux Linux affected 3397c3cd859a2c51962ad032dcf97961d42f9db2 f74c8696f14149d5e43cc28b015326a759c48f00 git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 7.0.12 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e344865bfca4eb37ed8d7ac5917226e49fcec7ce 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f74c8696f14149d5e43cc28b015326a759c48f00 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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