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CVE-2021-47345: RDMA/cma: Fix rdma_resolve_route() memory leak

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-05-21 · updated 2026-06-17
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/cma: Fix rdma_resolve_route() memory leak Fix a memory leak when "mda_resolve_route() is called more than once on the same "rdma_cm_id". This is possible if cma_query_handler() triggers the RDMA_CM_EVENT_ROUTE_ERROR flow which puts the state machine back and allows rdma_resolve_route() to be called again.

Affected products

• Linux kernel: before 4.4.276; from 4.5 before 4.9.276; from 4.10 before 4.14.240; from 4.15 before 4.19.198; from 4.20 before 5.4.133; from 5.5 before 5.10.51 — fixed in 4.14.240, 4.19.198, 4.4.276, 4.9.276, 5.10.51, 5.12.18

How to fix

Upgrade to a fixed version: Linux kernel 4.14.240, 4.19.198, 4.4.276, 4.9.276. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/032c68b4f5be128a2167f35b558b7cec88fe4972
• https://git.kernel.org/stable/c/07583ba2e2d8947c3d365d97608cb436510885ac
• https://git.kernel.org/stable/c/3d08b5917984f737f32d5bee9737b9075c3895c6
• https://git.kernel.org/stable/c/40b613db3a95bc27998e4097d74c2f7e5d083a0b
• https://git.kernel.org/stable/c/4893c938f2a140a74be91779e45e4a7fa111198f
• https://git.kernel.org/stable/c/74f160ead74bfe5f2b38afb4fcf86189f9ff40c9
• https://git.kernel.org/stable/c/e2da8ce2a9543f3ca5c93369bd1fe6eeb572101a
• https://git.kernel.org/stable/c/e4e062da082a199357ba4911145f331d40139ad8
• https://git.kernel.org/stable/c/f4f553d67236145fa5fd203ed7b35b9377e19939
• https://git.kernel.org/stable/c/032c68b4f5be128a2167f35b558b7cec88fe4972
• https://git.kernel.org/stable/c/07583ba2e2d8947c3d365d97608cb436510885ac
• https://git.kernel.org/stable/c/3d08b5917984f737f32d5bee9737b9075c3895c6

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