RDMA/uverbs: Guard legacy bundles without method_elm

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89505
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:32 UTC
Updated2026-09-11 20:19:32 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: RDMA/uverbs: Guard legacy bundles without method_elm The legacy write() path dispatches through a uverbs_api_write_method, but the uverbs_attr_bundle passed to provider code does not have an ioctl method element. If malformed provider input causes the common uverbs validation code to emit an error message, uverbs_get_handler_fn() dereferences the uninitialized method_elm pointer. Initialize method_elm explicitly for legacy bundles and make uverbs_get_handler_fn() return NULL when no ioctl method is present. The legacy dispatcher continues to use its local write method, while the ioctl path continues to use the registered ioctl handler.

Risk And Classification

EPSS: 0.001620000 probability, percentile 0.057740000 (date 2026-09-14)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7122ff96068a03595bde2fbafaca82ca2ed8084e edae84e5461749ed9adf9fcf5c6e075381040ac3 git Not specified
CNA Linux Linux affected 7122ff96068a03595bde2fbafaca82ca2ed8084e 60a42d510113f46de47e86a84bf5758597644487 git Not specified
CNA Linux Linux affected 7.1 Not specified
CNA Linux Linux unaffected 7.1 semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/60a42d510113f46de47e86a84bf5758597644487 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/edae84e5461749ed9adf9fcf5c6e075381040ac3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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