Vulnerability-Lookup

SUSE-SU-2026:24114-1

Vulnerability from csaf_suse - Published: 2026-10-07 09:30 - Updated: 2026-10-12 17:30

Summary

Security update for swtpm

Severity

Moderate

Notes

Title of the patch: Security update for swtpm

Description of the patch: This update for swtpm fixes the following issues: Security issue fixed: - CVE-2026-75900: Out-of-bounds read in SWTPM_NVRAM_CheckHeader due to sizeof(pointer) vs sizeof(struct) mismatch (bsc#1275653). Changes for swtpm: Update to 0.10.2: * Properly check for truncation following snprintf call - add upstream signing key and validate source signature - Fix SELinux policy for virtqemud_t swtpm_t setsched process and unix socket interactions. Allows virtqemud_t to: Signal and control swtpm_t processes (noatsecure, rlimitinh, siginh, signull, setsched), create and listen on Unix stream sockets with swtpm_t processes (bsc#1266339). Already accepted on upstream: https://github.com/stefanberger/swtpm/pull/1132 - Drop tunable in require to avoid policy loading issues with toolchain 3.11 (bsc#1271417). Can be dropped, once this is accepted upstream: https://github.com/stefanberger/swtpm/pull/1139 - Update SELinux module dir as macro to allow root path move from /var/lib/selinux to /etc/selinux (bsc#1221342) - Also load swtpm_libvirt in the selinux subpackage (bsc#1251789) - Update to version 0.10.1: + swtpm: Fix build error on 32bit systems due to inconsistent _FILE_OFFSET_BITS. + swtpm_setup: - Use DISTRO_PROFILES_DIR when listing profiles (fix path issue). - Do not pass a TPM 2 profile to swtpm when reconfiguring. + selinux: - Add rule for swtpm to be able to read password from pipe. - allow to map state file. - add NFS permissions for swtpm_t. - Add rule to allow swtpm_t opening of virt_log_t files.

Patchnames: SUSE-SL-Micro-6.2-1861

CVE-2026-75900

6.1 (Medium)


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

Affected products

Recommended 5 products

Product	Version	Remediation
Unresolved product id: SUSE Linux Micro 6.2:swtpm-0:0.10.2-160000.1.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.2:swtpm-0:0.10.2-160000.1.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.2:swtpm-0:0.10.2-160000.1.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.2:swtpm-0:0.10.2-160000.1.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.2:swtpm-selinux-0:0.10.2-160000.1.1.noarch	—	Vendor Fix

Threats

Impact moderate

References

12 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/1221342	self
https://bugzilla.suse.com/1251789	self
https://bugzilla.suse.com/1266339	self
https://bugzilla.suse.com/1271417	self
https://bugzilla.suse.com/1275653	self
https://www.suse.com/security/cve/CVE-2026-75900/	self
https://www.suse.com/security/cve/CVE-2026-75900	external
https://bugzilla.suse.com/1275653	external

JSON

To clipboard

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        "text": "This update for swtpm fixes the following issues:\n\nSecurity issue fixed:\n\n- CVE-2026-75900: Out-of-bounds read in SWTPM_NVRAM_CheckHeader due to sizeof(pointer) vs sizeof(struct) mismatch\n  (bsc#1275653).\n\nChanges for swtpm:\n\nUpdate to 0.10.2:\n\n* Properly check for truncation following snprintf call\n- add upstream signing key and validate source signature\n- Fix SELinux policy for virtqemud_t swtpm_t setsched\n process and unix socket interactions. Allows virtqemud_t to: Signal and\n control swtpm_t processes (noatsecure, rlimitinh, siginh, signull, setsched),\n create and listen on Unix stream sockets with swtpm_t processes (bsc#1266339).\n Already accepted on upstream:\n https://github.com/stefanberger/swtpm/pull/1132\n- Drop tunable in require to avoid policy loading issues\n with toolchain 3.11 (bsc#1271417).\n Can be dropped, once this is accepted upstream:\n https://github.com/stefanberger/swtpm/pull/1139\n- Update SELinux module dir as macro to allow root path move from /var/lib/selinux\n to /etc/selinux (bsc#1221342)\n- Also load swtpm_libvirt in the selinux subpackage (bsc#1251789)\n- Update to version 0.10.1:\n + swtpm: Fix build error on 32bit systems due to inconsistent\n _FILE_OFFSET_BITS.\n + swtpm_setup:\n - Use DISTRO_PROFILES_DIR when listing profiles (fix path\n issue).\n - Do not pass a TPM 2 profile to swtpm when reconfiguring.\n + selinux:\n - Add rule for swtpm to be able to read password from pipe.\n - allow to map state file.\n - add NFS permissions for swtpm_t.\n - Add rule to allow swtpm_t opening of virt_log_t files.\n",
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  },
  "vulnerabilities": [
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      "ids": [
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          "text": "https://www.suse.com/security/cve/CVE-2026-75900"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "An out-of-bounds read vulnerability was found in swtpm\u0027s SWTPM_NVRAM_CheckHeader() function. The entry guard checks the buffer length against sizeof(bh), where bh is a pointer, instead of sizeof(*bh), the actual struct size. This allows an undersized buffer to pass validation, causing a 2-byte heap overread on 64-bit systems (6 bytes on 32-bit) when accessing the totlen field. This may cause daemon termination on some platforms and leaks heap data to the log.",
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      "scores": [
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            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H",
            "version": "3.1"
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            "SUSE Linux Micro 6.2:swtpm-selinux-0:0.10.2-160000.1.1.noarch"
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          "category": "impact",
          "date": "2026-10-07T09:30:38Z",
          "details": "moderate"
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      ],
      "title": "CVE-2026-75900"
    }
  ]
}

CVE-2026-75900 (GCVE-0-2026-75900)

Vulnerability from cvelistv5 – Published: 2026-08-19 07:44 – Updated: 2026-08-21 19:22

Title

Swtpm: swtpm: out-of-bounds read in swtpm_nvram_checkheader due to sizeof(pointer) vs sizeof(struct) mismatch

Summary

An out-of-bounds read vulnerability was found in swtpm's SWTPM_NVRAM_CheckHeader() function. The entry guard checks the buffer length against sizeof(bh), where bh is a pointer, instead of sizeof(*bh), the actual struct size. This allows an undersized buffer to pass validation, causing a 2-byte heap overread on 64-bit systems (6 bytes on 32-bit) when accessing the totlen field. This may cause daemon termination on some platforms and leaks heap data to the log.

Severity

6.1 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-21 19:22 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

redhat redhat root Scorecard

References

2 references

URL	Tags
https://access.redhat.com/security/cve/CVE-2026-75900	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2517910	issue-trackingx_refsource_REDHAT

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

2026-08-19 07:30

Credits

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

Show details on NVD website

JSON

To clipboard

{
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                "id": "CVE-2026-75900",
                "options": [
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                  },
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                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-21T19:22:31.516001Z",
                "version": "2.0.3"
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          "shortName": "CISA-ADP"
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      }
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    "cna": {
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      "credits": [
        {
          "lang": "en",
          "value": "Red Hat would like to thank Suraj Theekshana (\u682a\u5f0f\u4f1a\u793eCyberCrew) for reporting this issue."
        }
      ],
      "datePublic": "2026-08-19T07:30:46.262Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "An out-of-bounds read vulnerability was found in swtpm\u0027s SWTPM_NVRAM_CheckHeader() function. The entry guard checks the buffer length against sizeof(bh), where bh is a pointer, instead of sizeof(*bh), the actual struct size. This allows an undersized buffer to pass validation, causing a 2-byte heap overread on 64-bit systems (6 bytes on 32-bit) when accessing the totlen field. This may cause daemon termination on some platforms and leaks heap data to the log."
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      ],
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            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H",
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          "url": "https://access.redhat.com/security/cve/CVE-2026-75900"
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          "time": "2026-08-14T00:00:00.000Z",
          "value": "Reported to Red Hat."
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          "lang": "en",
          "time": "2026-08-19T07:30:46.262Z",
          "value": "Made public."
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      ],
      "title": "Swtpm: swtpm: out-of-bounds read in swtpm_nvram_checkheader due to sizeof(pointer) vs sizeof(struct) mismatch",
      "workarounds": [
        {
          "lang": "en",
          "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.\nFixed version: 0.10.2"
        }
      ],
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  "cveMetadata": {
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    "datePublished": "2026-08-19T07:44:35.968Z",
    "dateReserved": "2026-08-18T14:30:48.257Z",
    "dateUpdated": "2026-08-21T19:22:41.001Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.
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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.

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SUSE-SU-2026:24114-1

CVE-2026-75900 (GCVE-0-2026-75900)

Tags

Sightings

Nomenclature

Related by attack behaviour