CVE-2026-74750

CVE CVE-2026-74750EUVD EUVD-2026-66580Published 2026-08-26T14:36:58.000ZLast changed 2026-08-27T05:01:10.000ZCVSS 7.5

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: ovpn: defer key slot crypto freeing to workqueue Key slots are released through a kref and the existing release path frees the AEAD transforms from an RCU callback. That is not safe for all crypto implementations: crypto_free_aead can sleep, for example when an async or hardware implementation has teardown work to complete. Use queue_rcu_work for key-slot release. This keeps the RCU grace period needed by lockless key-slot readers, but runs the actual crypto teardown from workqueue context where sleeping is allowed. Once the rcu_work callback runs, pre-existing RCU readers are gone, and the final kref put already proves that no transform user remains, so the worker can release the AEAD transforms and free the slot directly. The previous patch drains ovpn_wq during module exit, so queued key-slot teardown work cannot outlive module text.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Linux — Linux 6.16; 8534731dbf2d52a539b94defd06d2a8d3514aacb <2da3dfa1ddfe55a065f484750c83660e3bd4ac00; patch: 0; 8534731dbf2d52a539b94defd06d2a8d3514aacb <0f77ed5ee91946ea63e29f2e0ff9dc9e722d8da3; patch: 7.2; patch: 7.1.10

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Linux — Linux

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