CVE-2026-99059: wireguard: noise: reject response consumption after intermediate initiation
In the Linux kernel, the following vulnerability has been resolved:
wireguard: noise: reject response consumption after intermediate initiation
Two threads begin processing the identical response message, received twice. The first thread, A, runs. While it's running, the second one, B, gets partway through, and during that slow calculation, or even while blocking on downwrite(), A completes and then also a handshake initiation that's already been queued up runs in thread C, which itself takes that same downwrite(). The handshake initiation creation succeeds, and sets the state back to waiting-for-response, and calls upwrite(), at which point thread B resumes, because either its finished its calculations or was finally allowed to acquire downwrite(). Thread B then copies the state back to the peer, and begins a new session, using that state, which is the same session as the one made in thread A.
Thread A Thread B Thread C
downread() sA = handshake->state memcpy(cA, handshake->crypto) upread() if (sA != 1) goto fail slowcrypto(cA) downread() sB = handshake->state memcpy(cB, handshake->crypto) upread() if (sB != 1) goto fail slowcrypto(cB) downwrite() if (sA != handshake->state) goto fail memcpy(handshake->crypto, cA) handshake->state = 2 upwrite() downwrite() if (handshake->state != 2) goto fail derivesession(handshake->crypto) upwrite() downwrite() slowcrypto(handshake->crypto) handshake->state = 1 upwrite() downwrite() if (sB != handshake->state) goto fail memcpy(handshake->crypto, cB) handshake->state = 2 upwrite() downwrite() if (handshake->state != 2) goto fail derivesession(handshake->crypto) upwrite()
This seems basically impossible to hit in a meaningful way in practice, but ensure that it absolutely cannot happen by comparing the ephemeral private key that's on the stack with the latest one that the peer's handshake state has.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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ubuntu/linuxto a version that resolves this vulnerability.Fixed in 7.0.0-43.43 - Upgrade
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Event History
Frequently Asked Questions
What conditions are required for the race to occur?
The same WireGuard response message must be processed twice concurrently. One response-processing thread must complete while another is delayed in cryptographic work or waiting for the write lock, and a queued handshake initiation must reset the state to waiting-for-response before the delayed thread resumes.
What is the resulting state problem?
The delayed response-processing thread can copy its earlier handshake state back to the peer after a new initiation has already changed that state. It can then begin a session using the same session state that was used by the first response-processing thread.