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In the Linux kernel, the following vulnerability has been resolved:
md: init bioset in mddev_init
IO operations may be needed before md_run(), such as updating metadata after writing sysfs. Without bioset, this triggers a NULL pointer dereference as below:
BUG: kernel NULL pointer dereference, address: 0000000000000020 Call Trace: md_update_sb+0x658/0xe00 new_level_store+0xc5/0x120 md_attr_store+0xc9/0x1e0 sysfs_kf_write+0x6f/0xa0 kernfs_fop_write_iter+0x141/0x2a0 vfs_write+0x1fc/0x5a0 ksys_write+0x79/0x180 __x64_sys_write+0x1d/0x30 x64_sys_call+0x2818/0x2880 do_syscall_64+0xa9/0x580 entry_SYSCALL_64_after_hwframe+0x4b/0x53
Reproducer ``` mdadm -CR /dev/md0 -l1 -n2 /dev/sd[cd] echo inactive > /sys/block/md0/md/array_state echo 10 > /sys/block/md0/md/new_level ```
mddev_init() can only be called once per mddev, no need to test if bioset has been initialized anymore.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Dec 24, 2025 |
| Ubuntu | — | Upgrade linux-image-gcpUpgrade linux-image-oracle-6.17Upgrade linux-image-6.17.0-22-generic-64kUpgrade linux-image-6.17.0-1011-oracleUpgrade linux-image-oem-24.04Upgrade linux-image-6.17.0-1012-aws-64kUpgrade linux-image-oem-24.04dUpgrade linux-image-gcp-6.17Upgrade linux-image-oem-24.04bUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-realtimeUpgrade linux-image-oracleUpgrade linux-image-aws-6.17Upgrade linux-image-oem-6.17Upgrade linux-image-aws-64kUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-6.17.0-1012-gcp-64kUpgrade linux-image-6.17.0-1011-oracle-64kUpgrade linux-image-awsUpgrade linux-image-oem-24.04cUpgrade linux-image-virtualUpgrade linux-image-oracle-64k-6.17Upgrade linux-image-generic-6.17Upgrade linux-image-6.17.0-1012-gcpUpgrade linux-image-oem-24.04aUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-6.17.0-1013-azureUpgrade linux-image-azureUpgrade linux-image-raspi-6.17Upgrade linux-image-raspiUpgrade linux-image-gcp-64kUpgrade linux-image-generic-64kUpgrade linux-image-6.17.0-1014-raspiUpgrade linux-image-6.17.0-1020-oemUpgrade linux-image-gcp-64k-6.17Upgrade linux-image-oracle-64kUpgrade linux-image-6.17.0-1012-awsUpgrade linux-image-realtime-hwe-24.04Upgrade linux-image-6.17.0-1010-realtimeUpgrade linux-image-genericUpgrade linux-image-generic-64k-6.17Upgrade linux-image-aws-64k-6.17Upgrade linux-image-6.17.0-22-genericUpgrade linux-image-azure-6.17Upgrade linux-image-realtime-6.17Upgrade linux-image-virtual-6.17 | Apr 17, 2026 | Dec 24, 2025 |
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