CVE-2026-98221: KEYS: trusted: Fix tpm2_load_cmd() boundary check

CVE-2026-98221: KEYS: trusted: Fix tpm2_load_cmd() boundary check

[Greg Kroah-Hartman]

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

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

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

KEYS: trusted: Fix tpm2_load_cmd() boundary check

tpm2_load_cmd() does boundary checks against the ASN.1 size i.e.,
payload->blob_len. Address this by passing the decoded blob size to
tpm2_load_cmd(), and use it for the boundary checks.

The Linux kernel CVE team has assigned CVE-2026-98221 to this issue.


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

	Issue introduced in 5.13 with commit f2219745250f388edacabe6cca73654131c67d0a and fixed in 5.15.222 with commit cc86227fea28aed86c1fb52a884560b4440da198
	Issue introduced in 5.13 with commit f2219745250f388edacabe6cca73654131c67d0a and fixed in 6.1.189 with commit b020b447338872440142fe8a57350a483da86b7a
	Issue introduced in 5.13 with commit f2219745250f388edacabe6cca73654131c67d0a and fixed in 6.6.158 with commit 3fd487c69ad3161e358c33c170bab0cf02a071b7
	Issue introduced in 5.13 with commit f2219745250f388edacabe6cca73654131c67d0a and fixed in 6.12.112 with commit 5afa57ea91481c6c49f194b0f5a5c4d96a4d7348
	Issue introduced in 5.13 with commit f2219745250f388edacabe6cca73654131c67d0a and fixed in 6.18.54 with commit 9ddbc5f4bb498aff8096a5231574858a4bffee4f
	Issue introduced in 5.13 with commit f2219745250f388edacabe6cca73654131c67d0a and fixed in 7.2.8 with commit 134825dfc971fbf2b1d0f58f0b3bce8332ad0afb
	Issue introduced in 5.13 with commit f2219745250f388edacabe6cca73654131c67d0a and fixed in 7.3-rc4 with commit 114f00d738f15dd8c7318369edcdc53dd6d08763

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-2026-98221
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:
	security/keys/trusted-keys/trusted_tpm2.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/cc86227fea28aed86c1fb52a884560b4440da198
	https://git.kernel.org/stable/c/b020b447338872440142fe8a57350a483da86b7a
	https://git.kernel.org/stable/c/3fd487c69ad3161e358c33c170bab0cf02a071b7
	https://git.kernel.org/stable/c/5afa57ea91481c6c49f194b0f5a5c4d96a4d7348
	https://git.kernel.org/stable/c/9ddbc5f4bb498aff8096a5231574858a4bffee4f
	https://git.kernel.org/stable/c/134825dfc971fbf2b1d0f58f0b3bce8332ad0afb
	https://git.kernel.org/stable/c/114f00d738f15dd8c7318369edcdc53dd6d08763