vulnerability

Oracle Linux: CVE-2024-57942: ELSA-2025-20095-0: kernel security update (MODERATE)

Severity
5
CVSS
(AV:L/AC:L/Au:S/C:N/I:N/A:C)
Published
Jan 21, 2025
Added
Dec 3, 2025
Modified
Dec 3, 2025

Description

In the Linux kernel, the following vulnerability has been resolved:
netfs: Fix ceph copy to cache on write-begin
At the end of netfs_unlock_read_folio() in which folios are marked
appropriately for copying to the cache (either with by being marked dirty
and having their private data set or by having PG_private_2 set) and then
unlocked, the folio_queue struct has the entry pointing to the folio
cleared. This presents a problem for netfs_pgpriv2_write_to_the_cache(),
which is used to write folios marked with PG_private_2 to the cache as it
expects to be able to trawl the folio_queue list thereafter to find the
relevant folios, leading to a hang.
Fix this by not clearing the folio_queue entry if we're going to do the
deprecated copy-to-cache. The clearance will be done instead as the folios
are written to the cache.
This can be reproduced by starting cachefiles, mounting a ceph filesystem
with "-o fsc" and writing to it.

Solution

oracle-linux-upgrade-kernel
Title
NEW

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