CVE-2026-46051md/raid5: fix soft lockup in retry_aligned_read()

Official description

In the Linux kernel, the following vulnerability has been resolved: md/raid5: fix soft lockup in retry_aligned_read() When retry_aligned_read() encounters an overlapped stripe, it releases the stripe via raid5_release_stripe() which puts it on the lockless released_stripes llist. In the next raid5d loop iteration, release_stripe_list() drains the stripe onto handle_list (since STRIPE_HANDLE is set by the original IO), but retry_aligned_read() runs before handle_active_stripes() and removes the stripe from handle_list via find_get_stripe() -> list_del_init(). This prevents handle_stripe() from ever processing the stripe to resolve the overlap, causing an infinite loop and soft lockup. Fix this by using __release_stripe() with temp_inactive_list instead of raid5_release_stripe() in the failure path, so the stripe does not go through the released_stripes llist. This allows raid5d to break out of its loop, and the overlap will be resolved when the stripe is eventually processed by handle_stripe().

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/66df9f30673db66ac35145820a8e24906069ae57
• https://git.kernel.org/stable/c/4166d5234fe8b6c3c7f796a6c198605356c5b355
• https://git.kernel.org/stable/c/a9055300e07d9d6800264d3c2560e1d0144689ca
• https://git.kernel.org/stable/c/09880592f5a9dc73377d6eb5ac123537b5f8df49
• https://git.kernel.org/stable/c/80fc6ca2cbde018d52e13f305edcd643911bd94b
• https://git.kernel.org/stable/c/1985cb3247e87ff6b8ca4bc5f9626f4f51024507
• https://git.kernel.org/stable/c/883cc33b7af1c448663287f069ef9dfea001e90f
• https://git.kernel.org/stable/c/7f9f7c697474268d9ef9479df3ddfe7cdcfbbffc
• https://cert-portal.siemens.com/productcert/html/ssa-784472.html