CVE-2024-56690: crypto: pcrypt - Call crypto layer directly when padata_do_parallel() return -EBUSY

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: 2024-12-28 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: crypto: pcrypt - Call crypto layer directly when padata_do_parallel() return -EBUSY Since commit 8f4f68e788c3 ("crypto: pcrypt - Fix hungtask for PADATA_RESET"), the pcrypt encryption and decryption operations return -EAGAIN when the CPU goes online or offline. In alg_test(), a WARN is generated when pcrypt_aead_decrypt() or pcrypt_aead_encrypt() returns -EAGAIN, the unnecessary panic will occur when panic_on_warn set 1. Fix this issue by calling crypto layer directly without parallelization in that case.

Affected products

Linux kernel: from 4.14.331 before 4.15; from 4.19.300 before 4.19.325; from 5.4.262 before 5.4.287; from 5.10.202 before 5.10.231; from 5.15.140 before 5.15.174; from 6.1.64 before 6.1.120 — fixed in 4.15, 4.19.325, 5.10.231, 5.15.174, 5.4.287, 6.1.120

How to fix

Upgrade to a fixed version: Linux kernel 4.15, 4.19.325, 5.10.231, 5.15.174. Check the vendor advisory for mitigations.

References

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