CVE-2026-23047

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

libceph: make calc_target() set t->paused, not just clear it

Currently calc_target() clears t->paused if the request shouldn't be

paused anymore, but doesn't ever set t->paused even though it's able to

determine when the request should be paused. Setting t->paused is left

to __submit_request() which is fine for regular requests but doesn't

work for linger requests -- since __submit_request() doesn't operate

on linger requests, there is nowhere for lreq->t.paused to be set.

One consequence of this is that watches don't get reestablished on

paused -> unpaused transitions in cases where requests have been paused

long enough for the (paused) unwatch request to time out and for the

subsequent (re)watch request to enter the paused state. On top of the

watch not getting reestablished, rbd_reregister_watch() gets stuck with

rbd_dev->watch_mutex held:

rbd_register_watch

__rbd_register_watch

ceph_osdc_watch

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References