CVE-2025-38151: RDMA/cma: Fix hang when cma_netevent_callback fails to queue_work

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-07-03 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/cma: Fix hang when cma_netevent_callback fails to queue_work The cited commit fixed a crash when cma_netevent_callback was called for a cma_id while work on that id from a previous call had not yet started. The work item was re-initialized in the second call, which corrupted the work item currently in the work queue. However, it left a problem when queue_work fails (because the item is still pending in the work queue from a previous call). In this case, cma_id_put (which is called in the work handler) is therefore not called. This results in a userspace process hang (zombie process). Fix this by calling cma_id_put() if queue_work fails.

Affected products

Debian Linux: 11.0
Linux kernel: from 6.1.135 before 6.1.142; from 6.6.88 before 6.6.94; from 6.12.25 before 6.12.34; from 6.14.4 before 6.15; from 6.15.1 before 6.15.3; 6.15, 6.15-rc3, 6.15-rc4, 6.15-rc5, 6.15-rc6, 6.15-rc7 — fixed in 6.1.142, 6.12.34, 6.15, 6.15.3, 6.6.94

How to fix

Upgrade to a fixed version: Linux kernel 6.1.142, 6.12.34, 6.15, 6.15.3. Check the vendor advisory for mitigations.

References

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