CVE-2022-50382: padata: Always leave BHs disabled when running ->parallel()

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-09-18 · updated 2026-06-17
Weakness: CWE-667

Description

In the Linux kernel, the following vulnerability has been resolved: padata: Always leave BHs disabled when running ->parallel() A deadlock can happen when an overloaded system runs ->parallel() in the context of the current task: padata_do_parallel ->parallel() pcrypt_aead_enc/dec padata_do_serial spin_lock(&reorder->lock) // BHs still enabled <interrupt> ... __do_softirq ... padata_do_serial spin_lock(&reorder->lock) It's a bug for BHs to be on in _do_serial as Steffen points out, so ensure they're off in the "current task" case like they are in padata_parallel_worker to avoid this situation.

Affected products

Linux kernel: from 5.8 before 5.10.163; from 5.11 before 5.15.86; from 5.16 before 6.0.16; from 6.1 before 6.1.2 — fixed in 5.10.163, 5.15.86, 6.0.16, 6.1.2

How to fix

Upgrade to a fixed version: Linux kernel 5.10.163, 5.15.86, 6.0.16, 6.1.2. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2022-50382 or the next vulnerability affects your stack