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-livepatch-5.15.152-100.162Upgrade perfUpgrade perf-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfoUpgrade python-perfUpgrade python-perf-debuginfoUpgrade kernel-headersUpgrade bpftool-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-toolsUpgrade kernel-livepatch-5.10.192-182.736Upgrade kernelUpgrade kernel-develUpgrade kernel-livepatch-4.14.322-244.536Upgrade bpftoolUpgrade kernel-tools-develUpgrade kernel-debuginfo-common-x86_64 | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade kernel-develUpgrade kernel-modules-extraUpgrade kernel-libbpfUpgrade kernel-debuginfo-common-aarch64Upgrade perfUpgrade bpftool-debuginfoUpgrade kernel-toolsUpgrade perf-debuginfoUpgrade kernel-libbpf-develUpgrade kernel-tools-develUpgrade kernel-libbpf-staticUpgrade kernel-modules-extra-commonUpgrade kernel-debuginfoUpgrade python3-perfUpgrade kernel-headersUpgrade kernel-tools-debuginfoUpgrade kernel-livepatch-6.1.84-99.169Upgrade kernel-debuginfo-common-x86_64Upgrade python3-perf-debuginfoUpgrade bpftoolUpgrade kernel | Oct 16, 2025 | Sep 15, 2025 |
| Debian | — | Upgrade linux | Sep 17, 2025 | Sep 17, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernel-abi-stablelistsUpgrade kernelUpgrade kernel-tools-libsUpgrade kernel-toolsUpgrade python3-perf | Mar 17, 2026 | Mar 16, 2026 |
| Huawei Euleros 2_0_sp13 | — | Upgrade python3-perfUpgrade kernel-tools-libsUpgrade bpftoolUpgrade kernelUpgrade kernel-abi-stablelistsUpgrade kernel-tools | Mar 10, 2026 | Mar 10, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Sep 15, 2025 |
| Ubuntu | — | Upgrade linux-oracle-5.15Upgrade linux-ibmUpgrade linux-azure-fde-5.15Upgrade linux-intel-iotg-5.15Upgrade linux-azureUpgrade linuxUpgrade linux-aws-5.4Upgrade linux-gkeopUpgrade linux-azure-fipsUpgrade linux-hwe-5.15Upgrade linux-aws-5.15Upgrade linux-ibm-5.4Upgrade linux-raspiUpgrade linux-lowlatency-hwe-5.15Upgrade linux-lowlatencyUpgrade linux-azure-5.4Upgrade linux-realtimeUpgrade linux-awsUpgrade linux-iotUpgrade linux-intel-iotgUpgrade linux-nvidiaUpgrade linux-raspi-5.4Upgrade linux-gcp-5.15Upgrade linux-xilinx-zynqmpUpgrade linux-azure-5.15Upgrade linux-oracleUpgrade linux-nvidia-tegra-igxUpgrade linux-bluefieldUpgrade linux-oracle-5.4Upgrade linux-gcp-fipsUpgrade linux-kvmUpgrade linux-gcp-5.4Upgrade linux-nvidia-tegra-5.15Upgrade linux-ibm-5.15Upgrade linux-gcpUpgrade linux-hwe-5.4Upgrade linux-intel-iot-realtimeUpgrade linux-nvidia-tegraUpgrade linux-aws-fipsUpgrade linux-gkeUpgrade linux-riscv-5.15Upgrade linux-fips | 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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