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CVE-2026-45988: rxrpc: Fix re-decryption of RESPONSE packets

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-27 · updated 2026-10-19
• Weakness: CWE-682

Description

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix re-decryption of RESPONSE packets If a RESPONSE packet gets a temporary failure during processing, it may end up in a partially decrypted state - and then get requeued for a retry. Fix this by just discarding the packet; we will send another CHALLENGE packet and thereby elicit a further response. Similarly, discard an incoming CHALLENGE packet if we get an error whilst generating a RESPONSE; the server will send another CHALLENGE.

Affected products

• Linux kernel: from 2.6.22 before 6.6.140; from 6.7 before 6.12.86; from 6.13 before 6.18.27; from 6.19 before 7.0.4 — fixed in 6.12.86, 6.18.27, 6.6.140, 7.0.4

How to fix

Upgrade to a fixed version: Linux kernel 6.12.86, 6.18.27, 6.6.140, 7.0.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0422e7a4883f25101903f3e8105c0808aa5f4ce9
• https://git.kernel.org/stable/c/76cb9a2d252274adfae6e293a292434631a7d472
• https://git.kernel.org/stable/c/7b89868305052b94a91b708c462bc2281fa42a4a
• https://git.kernel.org/stable/c/d61482be4aae1835b78875761206241835a7510e
• https://git.kernel.org/stable/c/f55b383070170e988e4dec28be2af1714d258521

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