CVE-2022-50382: linux kernel — Fix

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.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-667 CWE-667

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.8 — 5.10.163
linux	linux_kernel	5.11 — 5.15.86
linux	linux_kernel	5.16 — 6.0.16
linux	linux_kernel	6.1 — 6.1.2

References

Advisories & Patches

https://git.kernel.org/stable/c/17afa98bccec4f52203508b3f49b5f948c6fd6ac https://git.kernel.org/stable/c/34c3a47d20ae55b3600fed733bf96eafe9c500d5 https://git.kernel.org/stable/c/6cfa9e60c0f88fdec6368e081ab968411cc706b1 https://git.kernel.org/stable/c/7337adb20fcc0aebb50eaff2bc5a8dd9a7c6743d https://git.kernel.org/stable/c/8e0681dd4eee029eb1d533d06993f7cb091efb73

Frequently Asked Questions

What is CVE-2022-50382? +

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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-50382? +

CVE-2022-50382 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2022-50382? +

CVE-2022-50382 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2022-50382? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2022-50382