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 kernel-develUpgrade kernel-debuginfo-common-x86_64Upgrade kernelUpgrade kernel-tools-develUpgrade bpftoolUpgrade kernel-toolsUpgrade kernel-livepatch-4.14.322-244.536Upgrade kernel-livepatch-5.10.192-182.736Upgrade python-perf-debuginfoUpgrade perfUpgrade bpftool-debuginfoUpgrade kernel-livepatch-5.15.152-100.162Upgrade kernel-debuginfoUpgrade perf-debuginfoUpgrade kernel-headersUpgrade kernel-debuginfo-common-aarch64Upgrade python-perfUpgrade kernel-tools-debuginfo | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade kernel-livepatch-6.1.84-99.169Upgrade python3-perf-debuginfoUpgrade bpftoolUpgrade kernel-debuginfoUpgrade kernel-libbpf-develUpgrade kernel-libbpf-staticUpgrade kernelUpgrade python3-perfUpgrade kernel-headersUpgrade kernel-modules-extra-commonUpgrade kernel-tools-debuginfoUpgrade kernel-tools-develUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-toolsUpgrade perfUpgrade bpftool-debuginfoUpgrade perf-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-modules-extraUpgrade kernel-develUpgrade kernel-libbpf | Oct 16, 2025 | Sep 15, 2025 |
| Debian | — | Upgrade linux | Sep 17, 2025 | Sep 17, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernel-tools-libsUpgrade kernel-abi-stablelistsUpgrade kernel-toolsUpgrade kernelUpgrade python3-perf | Mar 17, 2026 | Mar 16, 2026 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-tools-libsUpgrade bpftoolUpgrade python3-perfUpgrade kernel-toolsUpgrade kernel-abi-stablelistsUpgrade kernel | Mar 10, 2026 | Mar 10, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Sep 15, 2025 |
| Ubuntu | — | Upgrade linux-kvmUpgrade linux-nvidia-tegraUpgrade linux-aws-fipsUpgrade linux-gcp-5.4Upgrade linux-xilinx-zynqmpUpgrade linux-intel-iot-realtimeUpgrade linux-azure-5.15Upgrade linux-gcp-fipsUpgrade linux-nvidia-tegra-igxUpgrade linux-riscv-5.15Upgrade linux-gkeUpgrade linux-gcpUpgrade linux-nvidia-tegra-5.15Upgrade linux-intel-iotgUpgrade linux-ibm-5.15Upgrade linux-hwe-5.4Upgrade linux-oracle-5.4Upgrade linux-bluefieldUpgrade linux-fipsUpgrade linux-nvidiaUpgrade linux-raspi-5.4Upgrade linux-gcp-5.15Upgrade linux-oracleUpgrade linux-ibmUpgrade linux-realtimeUpgrade linux-azure-5.4Upgrade linux-hwe-5.15Upgrade linux-azure-fde-5.15Upgrade linux-oracle-5.15Upgrade linux-aws-5.15Upgrade linux-aws-5.4Upgrade linux-iotUpgrade linux-azureUpgrade linux-lowlatencyUpgrade linux-raspiUpgrade linux-gkeopUpgrade linuxUpgrade linux-azure-fipsUpgrade linux-ibm-5.4Upgrade linux-lowlatency-hwe-5.15Upgrade linux-intel-iotg-5.15Upgrade linux-aws | 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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