linux-cve-announce - CVE-2026-22990: libceph: replace overzealous BUG_ON in osdmap_apply

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Message-ID: <2026012351-CVE-2026-22990-a62e@gregkh>
Date: Fri, 23 Jan 2026 16:25:01 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2026-22990: libceph: replace overzealous BUG_ON in osdmap_apply_incremental()

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

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

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

libceph: replace overzealous BUG_ON in osdmap_apply_incremental()

If the osdmap is (maliciously) corrupted such that the incremental
osdmap epoch is different from what is expected, there is no need to
BUG.  Instead, just declare the incremental osdmap to be invalid.

The Linux kernel CVE team has assigned CVE-2026-22990 to this issue.


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

	Fixed in 5.10.248 with commit 9aa0b0c14cefece078286d78b97d4c09685e372d
	Fixed in 5.15.198 with commit 4b106fbb1c7b841cd402abd83eb2447164c799ea
	Fixed in 6.1.161 with commit 6afd2a4213524bc742b709599a3663aeaf77193c
	Fixed in 6.6.121 with commit d3613770e2677683e65d062da5e31f48c409abe9
	Fixed in 6.12.66 with commit 6c6cec3db3b418c4fdf815731bc39e46dff75e1b
	Fixed in 6.18.6 with commit 6348d70af847b79805374fe628d3809a63fd7df3
	Fixed in 6.19-rc5 with commit e00c3f71b5cf75681dbd74ee3f982a99cb690c2b

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-2026-22990
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/9aa0b0c14cefece078286d78b97d4c09685e372d
	https://git.kernel.org/stable/c/4b106fbb1c7b841cd402abd83eb2447164c799ea
	https://git.kernel.org/stable/c/6afd2a4213524bc742b709599a3663aeaf77193c
	https://git.kernel.org/stable/c/d3613770e2677683e65d062da5e31f48c409abe9
	https://git.kernel.org/stable/c/6c6cec3db3b418c4fdf815731bc39e46dff75e1b
	https://git.kernel.org/stable/c/6348d70af847b79805374fe628d3809a63fd7df3
	https://git.kernel.org/stable/c/e00c3f71b5cf75681dbd74ee3f982a99cb690c2b