CVE-2021-47378

Description

In the Linux kernel, the following vulnerability has been resolved: nvme-rdma: destroy cm id before destroy qp to avoid use after free We should always destroy cm_id before destroy qp to avoid to get cma event after qp was destroyed, which may lead to use after free. In RDMA connection establishment error flow, don't destroy qp in cm event handler.Just report cm_error to upper level, qp will be destroy in nvme_rdma_alloc_queue() after destroy cm id.

CVSS Metrics

• v3.1•CRITICAL•Score: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.09%• Percentile: 25%

Techniques & Countermeasures

• CWE-416•Use After Free

  The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected Systems

• linux•linux

  ≥ 7110230719602852481c2793d054f866b2bf4a2b, < ecf0dc5a904830c926a64feffd8e01141f89822f | ≥ 7110230719602852481c2793d054f866b2bf4a2b, < d268a182c56e8361e19fb781137411643312b994 | ≥ 7110230719602852481c2793d054f866b2bf4a2b, < 9817d763dbe15327b9b3ff4404fa6f27f927e744 | 4.8

• linux•linux_kernel

  < 5.10.70 | ≥ 5.11, < 5.14.9 | 5.15:rc1

References (3)

• https://git.kernel.org/stable/c/ecf0dc5a904830c926a64feffd8e01141f89822f
• https://git.kernel.org/stable/c/d268a182c56e8361e19fb781137411643312b994
• https://git.kernel.org/stable/c/9817d763dbe15327b9b3ff4404fa6f27f927e744