CVE-2022-50382 — linux / linux_kernel
Improper LockingIn 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.
| Software | From | Fixed in |
|---|---|---|
| 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 |
- 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
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A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.
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