ALSA: FCP: Fix NULL pointer dereference in interface lookup

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Summary

CVECVE-2026-72403
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:13 UTC
Updated2026-08-17 06:19:06 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ALSA: FCP: Fix NULL pointer dereference in interface lookup A malformed USB device can provide a vendor-specific interface without any endpoint descriptors. fcp_find_fc_interface() currently selects the first vendor-specific interface and reads endpoint 0 from it, without checking whether the interface actually has any endpoints. When bNumEndpoints is zero, no endpoint array is allocated for the parsed alternate setting, so get_endpoint(..., 0) yields an invalid endpoint descriptor pointer. Dereferencing it through usb_endpoint_num() then triggers a NULL pointer dereference. Skip vendor-specific interfaces that do not have any endpoints.

Risk And Classification

EPSS: 0.001980000 probability, percentile 0.099060000 (date 2026-08-17)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 46757a3e7d50dac923888e7fbe68377736f13c70 f28d7b5f1578a7501ab17b10643ed1e4f729187e git Not specified
CNA Linux Linux affected 46757a3e7d50dac923888e7fbe68377736f13c70 3ab06151ffcb8c3aeb8f78508658b6c0f05be932 git Not specified
CNA Linux Linux affected 46757a3e7d50dac923888e7fbe68377736f13c70 e1e31e0ec8a609e17fd2e86b77bc00d9cbb24d7c git Not specified
CNA Linux Linux affected 6.14 Not specified
CNA Linux Linux unaffected 6.14 semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f28d7b5f1578a7501ab17b10643ed1e4f729187e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3ab06151ffcb8c3aeb8f78508658b6c0f05be932 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e1e31e0ec8a609e17fd2e86b77bc00d9cbb24d7c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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