CVE-2026-90385
UnknownSummary
In the Linux kernel, md/raid1 skips creating rdev->serial when a new rdev is added to an existing RAID1 array with serialize_policy enabled, due to a condition in mddev_create_serial_pool(). wait_for_serialization() assumes rdev->serial is initialized, leading to an Oops on access to the uninitialized structure. The fix creates the serial pool when adding the rdev.
Risk Assessment
A kernel Oops during I/O operations on a RAID1 array with serialize_policy may cause data unavailability. Systems with RAID1 arrays and serialization enabled are affected.
Recommendation
Update the Linux kernel to a version with the fix that creates the serial pool when adding an rdev to the array. Avoid adding new devices to RAID1 arrays with serialize_policy until updated.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: md/raid1: create serial pool adding rdev to array with serialize_policy=1 The following bug has been observed with kernel 7.1.3 after adding a new rdev to an existing RAID1 array with serialize_policy enabled: Oops: 0002 [#1] CPU: 0 UID: 0 PID: 19639 Comm: ext4lazyinit Not tainted 7.1.3-1-default RIP: _raw_spin_lock_irqsave+0x27/0x50 CR2: 0000000000004960 Call Trace: wait_for_serialization+0xb9/0x260 [raid1] raid1_make_request+0x762/0xaff [raid1] md_handle_request+0x1c9/0x2e0 [md_mod] The raid1.c code calls wait_for_serialization() if the MD_SERIALIZE_POLICY is set, and wait_for_serialization assumes that rdev->serial is initialized. Normally this will be the case for arrays that have the serialize_policy sysfs attribute set to 1. But when a new rdev is added to an existing array in bind_rdev_to_array(), the condition at mddev_create_serial_pool() causes creation of rdev->serial to be skipped. Fix it.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS