CVE-2026-90385 PUBLISHED

md/raid1: create serial pool adding rdev to array with serialize_policy=1

Assigner: Linux
Reserved: 11.09.2026 Published: 17.09.2026 Updated: 17.09.2026

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.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from 69b00b5bb23552d43e8bbed73ef6624604bb94a2 to f9e4364449f7ca6917f3599eb32064dba5b7b147 (excl.)
  • affected from 69b00b5bb23552d43e8bbed73ef6624604bb94a2 to 37f11973c3eb72a5eb061082cad529bb6939c24f (excl.)
  • affected from 69b00b5bb23552d43e8bbed73ef6624604bb94a2 to c02d675e81468003e4f2253b616c53729070d712 (excl.)
  • affected from 69b00b5bb23552d43e8bbed73ef6624604bb94a2 to 140234b2380ffb8ffb0cfc46fee0e822f43adef7 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 5.6 is affected
  • unaffected from 0 to 5.6 (excl.)
  • unaffected from 6.12.110 to 6.12.* (incl.)
  • unaffected from 6.18.52 to 6.18.* (incl.)
  • unaffected from 7.2.6 to 7.2.* (incl.)
  • unaffected from 7.3-rc1 to * (incl.)

References