CVE-2026-89675 (GCVE-0-2026-89675)
Vulnerability from cvelistv5
Published
2026-09-11 19:45
Modified
2026-10-19 08:50
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
nfsd: fix UAF in async copy cancel and shutdown
An async copy could be freed or used after free while a teardown caller
(OFFLOAD_CANCEL, nfsd4_shutdown_copy, nfsd4_cancel_copy_by_sb) raced the
copy kthread:
- find_async_copy() bumped copy->refcount but left the copy on
clp->async_copies, so the reaper's cleanup_async_copy() could run
release_copy_files() concurrently with a cancel/shutdown caller. Both
put and NULL nf_src/nf_dst without a common lock, double-putting the
nfsd_file and freeing it early.
- nfsd4_do_async_copy() set NFSD4_COPY_F_STOPPED before its final uses
of the copy (nfsd_update_cmtime_attr() on copy->nf_dst,
nfsd4_send_cb_offload()). nfsd4_stop_copy() treats a set STOPPED bit
as "kthread done, skip kthread_stop()", so a teardown caller ran
release_copy_files() -- which puts and NULLs nf_dst -- while the
kthread still dereferenced it (NULL/UAF).
- copy->copy_task was never pinned. The one-shot kthread self-reaps on
return, so kthread_stop()'s get_task_struct() could touch a freed
task_struct.
- co_cb is embedded in the copy, but nfsd4_send_cb_offload() held a
reference only on the client, so a concurrent teardown could free
the copy while the CB_OFFLOAD callback was in flight.
Fix the teardown lifetime as a whole:
- find_async_copy() unlinks the copy (clear cp_clp, list_del_init)
under async_lock; the cancel, shutdown, and sb-cancel paths drop the
list-membership reference via nfs4_put_copy() after nfsd4_stop_copy().
Drop the now-redundant list_del fixup from cleanup_async_copy().
- Because unlinking hides the copy from the reaper, its
cleanup_async_copy() can no longer remove the copy's s2s_cp_stateids
entry; the cancel/shutdown/sb-cancel paths now call
nfs4_free_copy_state() themselves (while cp_clp is still valid) so
the entry does not dangle at freed memory for the laundromat and
manage_cpntf_state() to dereference.
- Give the kthread its own reference, taken in nfsd4_copy() before
wake_up_process() and dropped at the end of nfsd4_do_async_copy();
call wake_up_process() before list_add().
- Pin the task_struct with get_task_struct() in nfsd4_copy(), released
in nfs4_put_copy(), so kthread_stop() is safe whenever the kthread
exits. Set NFSD4_COPY_F_STOPPED only in nfsd4_stop_copy(), which now
always kthread_stop()s before release_copy_files(); completion is
still reported via NFSD4_COPY_F_COMPLETED, so
nfsd4_has_active_async_copies() is unaffected. Each teardown caller
removes the copy from clp->async_copies first, so kthread_stop() runs
exactly once.
- Take a copy reference in nfsd4_send_cb_offload(), dropped in
nfsd4_cb_offload_release(). The kthread still holds its own reference
there, so the refcount_inc() cannot race the final free.
- Read cp_clp with smp_load_acquire() to pair with the unordered
set_bit()/clear_bit() writers (Documentation/atomic_bitops.rst).
References
Impacted products
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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