CVE-2026-52960: ceph: put folios not suitable for writeback

CVE-2026-52960: ceph: put folios not suitable for writeback

[Greg Kroah-Hartman]

From: Greg Kroah-Hartman <gregkh@kernel.org>

Description
===========

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

ceph: put folios not suitable for writeback

The batch holds references to the folios (see `filemap_get_folios`,
`folio_batch_release`), so we need to `folio_put` the folios we remove.

Tested on v6.18.

The Linux kernel CVE team has assigned CVE-2026-52960 to this issue.


Affected and fixed versions
===========================

	Fixed in 7.0.10 with commit 86921e890fe1dea9791fb70bec552516fd47716a
	Fixed in 7.1 with commit 544576f0f05c4a759806acddfaaeb686f14fb4b0

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-52960
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	fs/ceph/addr.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/86921e890fe1dea9791fb70bec552516fd47716a
	https://git.kernel.org/stable/c/544576f0f05c4a759806acddfaaeb686f14fb4b0