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.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade perf-debuginfoUpgrade python-perf-debuginfoUpgrade kernel-livepatch-5.10.165-143.735Upgrade kernel-debuginfo-common-aarch64Upgrade kernel-tools-develUpgrade perfUpgrade kernel-livepatch-5.15.86-53.137Upgrade kernel-headersUpgrade kernel-toolsUpgrade kernel-tools-debuginfoUpgrade kernel-develUpgrade kernelUpgrade kernel-debuginfo-common-x86_64Upgrade bpftoolUpgrade python-perfUpgrade bpftool-debuginfoUpgrade kernel-debuginfo | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Sep 22, 2025 | Sep 22, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernelUpgrade python3-perfUpgrade kernel-abi-stablelistsUpgrade kernel-tools-libsUpgrade bpftoolUpgrade kernel-tools | Dec 12, 2025 | Dec 11, 2025 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Sep 18, 2025 |
| Ubuntu | — | Upgrade linux-hwe-5.15Upgrade linux-oracle-5.15Upgrade linux-lowlatencyUpgrade linux-intel-iotgUpgrade linux-nvidiaUpgrade linux-lowlatency-hwe-5.15Upgrade linux-azureUpgrade linux-ibmUpgrade linux-intel-iotg-5.15Upgrade linux-raspiUpgrade linux-bluefieldUpgrade linux-gkeopUpgrade linux-realtimeUpgrade linux-kvmUpgrade linux-azure-5.15Upgrade linux-oracleUpgrade linux-gcp-5.15Upgrade linux-awsUpgrade linux-aws-5.15Upgrade linux-gcpUpgrade linux-gkeUpgrade linux-nvidia-tegra-5.15Upgrade linuxUpgrade linux-riscv-5.15Upgrade linux-intel-iot-realtime | Sep 26, 2025 | Sep 18, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 15, 2025 | Sep 18, 2025 |
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