PT-2026-61384 · Linux · Linux
CVE-2026-64067
·
Publicado
2026-07-19
·
Atualizado
2026-07-19
CVSS v3.1
9.8
Crítica
| Vetor | AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
In the Linux kernel, the following vulnerability has been resolved:
netfs: Fix missing barriers when accessing stream->subrequests locklessly
The list of subrequests attached to stream->subrequests is accessed without
locks by netfs collect read results() and netfs collect write results(),
and then they access subreq->flags without taking a barrier after getting
the subreq pointer from the list. Relatedly, the functions that build the
list don't use any sort of write barrier when constructing the list to make
sure that the NETFS SREQ IN PROGRESS flag is perceived to be set first if
no lock is taken.
Fix this by:
(1) Add a new list add tail release() function that uses a release barrier
to set the pointer to the new member of the list.
(2) Add a new list first entry or null acquire() function that uses an
acquire barrier to read the pointer to the first member in a list (or
return NULL).
(3) Use list add tail release() when adding a subreq to ->subrequests.
(4) Use list first entry or null acquire() when initially accessing the
front of the list (when an item is removed, the pointer to the new
front iterm is obtained under the same lock).
Correção
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Linux