CVE-2026-52962: ceph: fix a buffer leak in __ceph_setxattr()

CVE-2026-52962: ceph: fix a buffer leak in __ceph_setxattr()

[Greg Kroah-Hartman]

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

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

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

ceph: fix a buffer leak in __ceph_setxattr()

The old_blob in __ceph_setxattr() can store
ci->i_xattrs.prealloc_blob value during the retry.
However, it is never called the ceph_buffer_put()
for the old_blob object. This patch fixes the issue of
the buffer leak.

The Linux kernel CVE team has assigned CVE-2026-52962 to this issue.


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

	Fixed in 5.10.258 with commit 521e5aba857fd267624892c8dd6295f22ce0267e
	Fixed in 5.15.209 with commit d0cb994605c84a159c1d00d72cdc8583c321ef95
	Fixed in 6.1.175 with commit ecf94823c5c6a20790bb76ed2816822b0beb0c22
	Fixed in 6.6.141 with commit 4bfdcefdaa6092a06cacd59389c7756b36e6de8c
	Fixed in 6.12.91 with commit 7d3e8d2d648d5f0df29b4710246680f47695fe94
	Fixed in 6.18.33 with commit 3fa13ceefbc5f36131110342743994cb3de80637
	Fixed in 7.0.10 with commit bc7abce4460e490dcb579eec770f175b150b685f
	Fixed in 7.1 with commit 5d3cc36b4e77a27ce7b686b7c59c7072bcb3fa8e

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-2026-52962
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/xattr.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/521e5aba857fd267624892c8dd6295f22ce0267e
	https://git.kernel.org/stable/c/d0cb994605c84a159c1d00d72cdc8583c321ef95
	https://git.kernel.org/stable/c/ecf94823c5c6a20790bb76ed2816822b0beb0c22
	https://git.kernel.org/stable/c/4bfdcefdaa6092a06cacd59389c7756b36e6de8c
	https://git.kernel.org/stable/c/7d3e8d2d648d5f0df29b4710246680f47695fe94
	https://git.kernel.org/stable/c/3fa13ceefbc5f36131110342743994cb3de80637
	https://git.kernel.org/stable/c/bc7abce4460e490dcb579eec770f175b150b685f
	https://git.kernel.org/stable/c/5d3cc36b4e77a27ce7b686b7c59c7072bcb3fa8e