wireguard: noise: reject response consumption after intermediate initiation

Description

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 down_write(), A completes and then also a handshake initiation that's already been queued up runs in thread C, which itself takes that same down_write(). The handshake initiation creation succeeds, and sets the state back to waiting-for-response, and calls up_write(), at which point thread B resumes, because either its finished its calculations or was finally allowed to acquire down_write(). 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 down_read() sA = handshake->state memcpy(cA, handshake->crypto) up_read() if (sA != 1) goto fail slow_crypto(cA) down_read() sB = handshake->state memcpy(cB, handshake->crypto) up_read() if (sB != 1) goto fail slow_crypto(cB) down_write() if (sA != handshake->state) goto fail memcpy(handshake->crypto, cA) handshake->state = 2 up_write() down_write() if (handshake->state != 2) goto fail derive_session(handshake->crypto) up_write() down_write() slow_crypto(handshake->crypto) handshake->state = 1 up_write() down_write() if (sB != handshake->state) goto fail memcpy(handshake->crypto, cB) handshake->state = 2 up_write() down_write() if (handshake->state != 2) goto fail derive_session(handshake->crypto) up_write() 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.

Timeline

Scores

EPSS (exploitation in 30 days)

0.51% · top 56% of all CVEs (12 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.7.

Affected products

• Linux · Linux

  • affected e7096c131e5161fa3b8e52a650d7719d2857adfd – < dbd1e21f4301bd2157cd771255f1ca6ba1c8a1f9
  • affected e7096c131e5161fa3b8e52a650d7719d2857adfd – < f4012ec25a4abb6a23dc40043f61e2d9a7deca6d
  • affected e7096c131e5161fa3b8e52a650d7719d2857adfd – < 6b5b14cb5421e84191e3f6b5a7566783a402ff7f
  • affected e7096c131e5161fa3b8e52a650d7719d2857adfd – < fb5ce4c7790c3eeec820302d08d70ecf46af4295
  • affected e7096c131e5161fa3b8e52a650d7719d2857adfd – < c76a80db593096edf2b3b3972f58b6342a8c6c04
  • affected e7096c131e5161fa3b8e52a650d7719d2857adfd – < 4d64a3d6e96aa78619c9c29ffde309794974588a
  • affected e7096c131e5161fa3b8e52a650d7719d2857adfd – < 3bec3d32c2a3afd164fc87f95457df2cf9049c20
  • affected e7096c131e5161fa3b8e52a650d7719d2857adfd – < d0305f8d90029556260c6824b61c493c424eba9e

• Linux · Linux

  • affected 5.6
  • unaffected < 5.6
  • unaffected 5.10.273 – ≤ 5.10.*
  • unaffected 5.15.224 – ≤ 5.15.*
  • unaffected 6.1.191 – ≤ 6.1.*
  • unaffected 6.6.160 – ≤ 6.6.*
  • unaffected 6.12.113 – ≤ 6.12.*
  • unaffected 6.18.57 – ≤ 6.18.*
  • unaffected 7.2.11 – ≤ 7.2.*
  • unaffected 7.3 – ≤ *

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2026-108725 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-99059](https://cveledger.app/badge/CVE-2026-99059.svg)](https://cveledger.app/cve/CVE-2026-99059)

Record last updated 30 Oct 2026, 12:41 UTC.