linux-cve-announce - CVE-2026-22991: libceph: make free_choose_arg

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Message-ID: <2026012351-CVE-2026-22991-e4a2@gregkh>
Date: Fri, 23 Jan 2026 16:25:02 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2026-22991: libceph: make free_choose_arg_map() resilient to partial allocation

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

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

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

libceph: make free_choose_arg_map() resilient to partial allocation

free_choose_arg_map() may dereference a NULL pointer if its caller fails
after a partial allocation.

For example, in decode_choose_args(), if allocation of arg_map->args
fails, execution jumps to the fail label and free_choose_arg_map() is
called. Since arg_map->size is updated to a non-zero value before memory
allocation, free_choose_arg_map() will iterate over arg_map->args and
dereference a NULL pointer.

To prevent this potential NULL pointer dereference and make
free_choose_arg_map() more resilient, add checks for pointers before
iterating.

The Linux kernel CVE team has assigned CVE-2026-22991 to this issue.


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

	Fixed in 5.10.248 with commit 9b3730dabcf3764bfe3ff07caf55e641a0b45234
	Fixed in 5.15.198 with commit 851241d3f78a5505224dc21c03d8692f530256b4
	Fixed in 6.1.161 with commit ec1850f663da64842614c86b20fe734be070c2ba
	Fixed in 6.6.121 with commit 8081faaf089db5280c3be820948469f7c58ef8dd
	Fixed in 6.12.66 with commit c4c2152a858c0ce4d2bff6ca8c1d5b0ef9f2cbdf
	Fixed in 6.18.6 with commit f21c3fdb96833aac2f533506899fe38c19cf49d5
	Fixed in 6.19-rc5 with commit e3fe30e57649c551757a02e1cad073c47e1e075e

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-2026-22991
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:
	net/ceph/osdmap.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/9b3730dabcf3764bfe3ff07caf55e641a0b45234
	https://git.kernel.org/stable/c/851241d3f78a5505224dc21c03d8692f530256b4
	https://git.kernel.org/stable/c/ec1850f663da64842614c86b20fe734be070c2ba
	https://git.kernel.org/stable/c/8081faaf089db5280c3be820948469f7c58ef8dd
	https://git.kernel.org/stable/c/c4c2152a858c0ce4d2bff6ca8c1d5b0ef9f2cbdf
	https://git.kernel.org/stable/c/f21c3fdb96833aac2f533506899fe38c19cf49d5
	https://git.kernel.org/stable/c/e3fe30e57649c551757a02e1cad073c47e1e075e