Advisory [CVE-2026-63907] fix double free of devm_kzalloc memory
This security Red Hat Linux advisory covers CVE-2026-63907.
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Summary
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. 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. This vulnerability, a double free, occurs because memory allocated with `devm_kzalloc()` is automatically freed, but the `kfree(udev)` function is also explicitly called during both error handling and device removal.
A local attacker could exploit this double free to cause memory corruption, potentially leading to a denial of service (DoS) on the system. Red Hat severity: not rated.
Weakness: CWE-1341.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · medium-confidence parse· fetched 7 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 7 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 7 days ago·verify at source
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