In the Linux kernel, the following vulnerability has been resolved:
md/raid10: prevent soft lockup while flush writes
Currently, there is no limit for raid1/raid10 plugged bio. While flushing writes, raid1 has cond_resched() while raid10 doesn't, and too many writes can cause soft lockup.
Follow up soft lockup can be triggered easily with writeback test for raid10 with ramdisks:
watchdog: BUG: soft lockup - CPU#10 stuck for 27s! [md0_raid10:1293] Call Trace: <TASK> call_rcu+0x16/0x20 put_object+0x41/0x80 __delete_object+0x50/0x90 delete_object_full+0x2b/0x40 kmemleak_free+0x46/0xa0 slab_free_freelist_hook.constprop.0+0xed/0x1a0 kmem_cache_free+0xfd/0x300 mempool_free_slab+0x1f/0x30 mempool_free+0x3a/0x100 bio_free+0x59/0x80 bio_put+0xcf/0x2c0 free_r10bio+0xbf/0xf0 raid_end_bio_io+0x78/0xb0 one_write_done+0x8a/0xa0 raid10_end_write_request+0x1b4/0x430 bio_endio+0x175/0x320 brd_submit_bio+0x3b9/0x9b7 [brd] __submit_bio+0x69/0xe0 submit_bio_noacct_nocheck+0x1e6/0x5a0 submit_bio_noacct+0x38c/0x7e0 flush_pending_writes+0xf0/0x240 raid10d+0xac/0x1ed0
Fix the problem by adding cond_resched() to raid10 like what raid1 did.
Note that unlimited plugged bio still need to be optimized, for example, in the case of lots of dirty pages writeback, this will take lots of memory and io will spend a long time in plug, hence io latency is bad.
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 kernelUpgrade kernel-livepatch-5.10.192-182.736Upgrade kernel-tools-develUpgrade bpftoolUpgrade kernel-toolsUpgrade kernel-livepatch-4.14.322-244.536Upgrade kernel-develUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-debuginfoUpgrade python-perf-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-livepatch-5.15.152-100.162Upgrade perf-debuginfoUpgrade bpftool-debuginfoUpgrade kernel-headersUpgrade perfUpgrade python-perf | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade python3-perf-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-headersUpgrade python3-perfUpgrade kernel-debuginfoUpgrade kernel-modules-extra-commonUpgrade bpftoolUpgrade kernel-livepatch-6.1.84-99.169Upgrade kernel-tools-develUpgrade kernel-libbpf-develUpgrade kernelUpgrade kernel-libbpf-staticUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-develUpgrade kernel-libbpfUpgrade kernel-toolsUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-modules-extraUpgrade perf-debuginfoUpgrade bpftool-debuginfoUpgrade perf | Oct 16, 2025 | Sep 15, 2025 |
| Debian | — | Upgrade linux | Sep 17, 2025 | Sep 17, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernel-tools-libsUpgrade kernelUpgrade kernel-abi-stablelistsUpgrade kernel-toolsUpgrade python3-perf | Mar 17, 2026 | Mar 16, 2026 |
| Huawei Euleros 2_0_sp13 | — | Upgrade bpftoolUpgrade kernel-tools-libsUpgrade python3-perfUpgrade kernelUpgrade kernel-toolsUpgrade kernel-abi-stablelists | Mar 10, 2026 | Mar 10, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Sep 15, 2025 |
| Ubuntu | — | Upgrade linux-oracle-5.15Upgrade linux-azure-fde-5.15Upgrade linux-ibmUpgrade linux-realtimeUpgrade linux-aws-5.4Upgrade linux-gkeopUpgrade linux-ibm-5.4Upgrade linux-iotUpgrade linux-azureUpgrade linux-lowlatency-hwe-5.15Upgrade linux-raspiUpgrade linux-hwe-5.15Upgrade linux-azure-fipsUpgrade linux-lowlatencyUpgrade linux-azure-5.4Upgrade linux-intel-iotg-5.15Upgrade linux-awsUpgrade linux-aws-5.15Upgrade linuxUpgrade linux-nvidia-tegra-igxUpgrade linux-oracleUpgrade linux-bluefieldUpgrade linux-nvidiaUpgrade linux-gkeUpgrade linux-nvidia-tegraUpgrade linux-intel-iot-realtimeUpgrade linux-riscv-5.15Upgrade linux-aws-fipsUpgrade linux-raspi-5.4Upgrade linux-oracle-5.4Upgrade linux-gcp-fipsUpgrade linux-gcpUpgrade linux-kvmUpgrade linux-gcp-5.15Upgrade linux-hwe-5.4Upgrade linux-intel-iotgUpgrade linux-ibm-5.15Upgrade linux-nvidia-tegra-5.15Upgrade linux-gcp-5.4Upgrade linux-xilinx-zynqmpUpgrade linux-fipsUpgrade linux-azure-5.15 | Sep 19, 2025 | Sep 16, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 10, 2025 | Sep 15, 2025 |
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