In the Linux kernel, the following vulnerability has been resolved:
md/raid10: fix null-ptr-deref in raid10_sync_request
init_resync() inits mempool and sets conf->have_replacemnt at the beginning of sync, close_sync() frees the mempool when sync is completed.
After [1] recovery might be skipped and init_resync() is called but close_sync() is not. null-ptr-deref occurs with r10bio->dev[i].repl_bio.
The following is one way to reproduce the issue.
1) create a array, wait for resync to complete, mddev->recovery_cp is set to MaxSector. 2) recovery is woken and it is skipped. conf->have_replacement is set to 0 in init_resync(). close_sync() not called. 3) some io errors and rdev A is set to WantReplacement. 4) a new device is added and set to A's replacement. 5) recovery is woken, A have replacement, but conf->have_replacemnt is 0. r10bio->dev[i].repl_bio will not be alloced and null-ptr-deref occurs.
Fix it by not calling init_resync() if recovery skipped.
[1] commit 7e83ccbecd60 ("md/raid10: Allow skipping recovery when clean arrays are assembled")
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade bpftoolUpgrade kernel-livepatch-5.15.117-72.142Upgrade perfUpgrade perf-debuginfoUpgrade kernel-develUpgrade kernel-tools-develUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-headersUpgrade kernelUpgrade python-perf-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-livepatch-5.10.184-174.730Upgrade bpftool-debuginfoUpgrade kernel-toolsUpgrade python-perf | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade kernelUpgrade kernel-tools-debuginfoUpgrade kernel-tools-develUpgrade kernel-libbpfUpgrade perfUpgrade kernel-libbpf-staticUpgrade kernel-debuginfoUpgrade kernel-libbpf-develUpgrade python3-perfUpgrade bpftoolUpgrade python3-perf-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-livepatch-6.1.29-47.49Upgrade kernel-develUpgrade kernel-debuginfo-common-x86_64Upgrade perf-debuginfoUpgrade kernel-headersUpgrade bpftool-debuginfoUpgrade kernel-tools | Jan 12, 2026 | Dec 9, 2025 |
| Debian | — | Upgrade linux | Dec 10, 2025 | Dec 10, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernel-tools-libsUpgrade kernelUpgrade kernel-abi-stablelistsUpgrade python3-perfUpgrade kernel-tools | Mar 17, 2026 | Mar 16, 2026 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-abi-stablelistsUpgrade kernel-toolsUpgrade kernel-tools-libsUpgrade kernelUpgrade python3-perfUpgrade bpftool | Mar 10, 2026 | Mar 10, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Dec 9, 2025 |
| Ubuntu | — | Upgrade linux-azure-fdeUpgrade linux-azure-5.4Upgrade linux-aws-5.15Upgrade linux-iotUpgrade linux-realtimeUpgrade linux-intel-iot-realtimeUpgrade linux-awsUpgrade linux-lowlatency-hwe-5.15Upgrade linux-raspi-5.4Upgrade linux-nvidia-tegra-5.15Upgrade linux-gcp-fipsUpgrade linux-bluefieldUpgrade linux-gcpUpgrade linux-nvidia-tegraUpgrade linux-gcp-5.15Upgrade linuxUpgrade linux-intel-iotg-5.15Upgrade linux-azure-5.15Upgrade linux-oracleUpgrade linux-ibm-5.15Upgrade linux-raspiUpgrade linux-azureUpgrade linux-gkeopUpgrade linux-gkeUpgrade linux-gcp-5.4Upgrade linux-nvidia-tegra-igxUpgrade linux-kvmUpgrade linux-oracle-5.4Upgrade linux-hwe-5.15Upgrade linux-ibmUpgrade linux-xilinx-zynqmpUpgrade linux-azure-fipsUpgrade linux-fipsUpgrade linux-aws-5.4Upgrade linux-hwe-5.4Upgrade linux-nvidiaUpgrade linux-intel-iotgUpgrade linux-oracle-5.15Upgrade linux-ibm-5.4Upgrade linux-lowlatencyUpgrade linux-riscv-5.15Upgrade linux-aws-fips | Dec 11, 2025 | Dec 9, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Dec 9, 2025 |
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