DEBIAN-CVE-2026-89558

In the Linux kernel, the following vulnerability has been resolved:  md/raid10: fix stilldegraded being inverted in raid10syncrequest()  Commit fe6a19d40ceb ("md/md-bitmap: merge mdbitmapstartsync() into bitmapoperations") converted stilldegraded from int to bool, but inverted the assignment in the loop that checks whether the array will still be degraded after the current device is recovered: "stilldegraded = 1" became "stilldegraded = false".  As a result, recovering a device while another mirror is still missing calls mdbitmapstartsync() with degraded == false, which clears bitmap bits that the still-missing device needs.  When that device is re-added, its bitmap-based recovery finds the bits already cleared and skips every region written while the array was degraded, so it is marked Insync while holding stale data: silent corruption.  Reproducer (raid10 near=2, 4 disks, internal bitmap):  - fail and remove one disk of each mirror pair  - write to the degraded array  - re-add both disks and let recovery finish  - "check" reports mismatchcnt=262272 after 256 MiB of degraded    writes and file contents differ; the second disk's "recovery"    completes in milliseconds because everything is skipped  The same conversion in raid1 got it right (stilldegraded = true). Restore the correct value.