Vulnerability-Lookup

SUSE-SU-2026:23926-1

Vulnerability from csaf_suse - Published: 2026-09-22 11:40 - Updated: 2026-09-30 11:16

Summary

Security update for libtpms

Severity

Moderate

Notes

Title of the patch: Security update for libtpms

Description of the patch: This update for libtpms fixes the following issue: - CVE-2026-85769: heap out-of-bounds read in TPM2 state unmarshalling via unchecked block_skip_read() blocksize (bsc#1279628).

Patchnames: SUSE-SLE-Micro-6.1-741

CVE-2026-85769

5.5 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

Recommended 4 products

Product	Version	Remediation
Unresolved product id: SUSE Linux Micro 6.1:libtpms0-0:0.9.6-slfo.1.1_3.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:libtpms0-0:0.9.6-slfo.1.1_3.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:libtpms0-0:0.9.6-slfo.1.1_3.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:libtpms0-0:0.9.6-slfo.1.1_3.1.x86_64	—	Vendor Fix

Threats

Impact moderate

References

8 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/s…	self
https://www.suse.com/support/update/announcement/…	self
https://www.suse.com/support/update/announcement/…	self
https://bugzilla.suse.com/1279628	self
https://www.suse.com/security/cve/CVE-2026-85769/	self
https://www.suse.com/security/cve/CVE-2026-85769	external
https://bugzilla.suse.com/1279628	external

JSON

To clipboard

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CVE-2026-85769 (GCVE-0-2026-85769)

Vulnerability from cvelistv5 – Published: 2026-09-04 17:48 – Updated: 2026-09-09 17:11

Title

Libtpms: libtpms: heap out-of-bounds read in tpm2 state unmarshalling via unchecked block_skip_read() blocksize

Summary

A flaw was found in libtpms, a library that provides software TPM 2.0 emulation. When restoring TPM 2.0 state (for example during a virtual machine's power-on or state/migration restore), a malformed state blob can supply an oversized skip-block length that is not validated against the remaining size of the input buffer. This can drive an internal size counter negative, which bypasses a subsequent bounds check due to an unsafe signed-to-unsigned conversion, causing the parser to read memory outside the bounds of the heap buffer holding the state data. Successful exploitation can crash the process hosting libtpms (such as swtpm), resulting in a denial of service of the emulated TPM device and the virtual machine that depends on it. No data corruption or information disclosure was confirmed.

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-04 18:51 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

redhat redhat root Scorecard

References

5 references

URL	Tags
https://access.redhat.com/security/cve/CVE-2026-85769	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2528538	issue-trackingx_refsource_REDHAT
https://github.com/stefanberger/libtpms/commit/b1…
https://github.com/stefanberger/libtpms/issues/614
https://github.com/stefanberger/libtpms/pull/613

Impacted products

3 products

Vendor	Product	Version
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9

Date Public

2026-09-04 00:00

Credits

Red Hat would like to thank Isuka Sanuj (株式会社CyberCrew) for reporting this issue.

Show details on NVD website

JSON

To clipboard

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    "assignerShortName": "redhat",
    "cveId": "CVE-2026-85769",
    "datePublished": "2026-09-04T17:48:13.674Z",
    "dateReserved": "2026-09-04T15:19:09.987Z",
    "dateUpdated": "2026-09-09T17:11:13.677Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

SUSE-SU-2026:23926-1

CVE-2026-85769 (GCVE-0-2026-85769)

Tags

Sightings

Nomenclature

Related by attack behaviour