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swtpm CVE-2026-75900

| EUVDEUVD-2026-62363 MEDIUM
Out-of-bounds Read (CWE-125)
2026-08-19 redhat GHSA-gqrg-h59c-j4wj
Information Disclosure Buffer Overflow Red Hat Enterprise Linux 10 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 9 Red Hat Suse
6.1
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
6.1 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
vuln.today AI
6.1 MEDIUM

Local socket access and low-privilege account required; heap leak goes to log not attacker; daemon crash drives high availability impact.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative
Red Hat
6.1 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
High

Lifecycle Timeline

2
Analysis Generated
Aug 19, 2026 - 08:36 vuln.today
CVE Published
Aug 19, 2026 - 07:44 nvd
MEDIUM 6.1

DescriptionCVE.org

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.

AnalysisAI

Heap overread in swtpm's SWTPM_NVRAM_CheckHeader() function allows local low-privileged users to crash the swtpm daemon and leak heap memory contents to system logs on Red Hat Enterprise Linux 8, 9, and 10. The root cause is a classic sizeof-pointer vs. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Gain low-privilege local user access
Delivery
Identify active swtpm socket on KVM host
Exploit
Craft NVRAM header buffer sized to satisfy pointer-width guard
Install
Submit malformed buffer to swtpm daemon
C2
Bypass sizeof(bh) validation check
Execute
Trigger 2-byte heap overread on totlen access
Impact
Crash daemon disrupting VM TPM services or leak heap data to log
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Vulnerability AssessmentAI

Exploitation Exploitation requires a local user account with at least low-privilege access on the affected system (PR:L per CVSS vector). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 score of 6.1 (Medium) accurately reflects the constrained attack surface: local access is required (AV:L), low-privilege credentials suffice (PR:L), and complexity is low (AC:L). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A local user with a standard unprivileged account on an RHEL 8/9/10 KVM host crafts an NVRAM blob with a header buffer sized to match sizeof(bh) (8 bytes on 64-bit) - just enough to pass the flawed guard - and submits it to the swtpm daemon via its socket interface. The daemon reads 2 bytes past the allocated buffer when accessing the totlen field; on platforms where this triggers an access violation, the swtpm process terminates, disrupting TPM services for all VMs relying on it, and any heap contents at the overread address are written to the daemon's log. …
Remediation Monitor the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-75900 for the official patched swtpm package - no exact fix version is confirmed in the available intelligence and none should be assumed. … Detailed patch versions, workarounds, and compensating controls in full report.
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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Micro 5.3 Affected
SUSE Linux Enterprise Micro 5.4 Affected
SUSE Linux Enterprise Micro 5.5 Affected
SUSE Linux Enterprise Module for Server Applications 15 SP7 Affected

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CVE-2026-75900 vulnerability details – vuln.today
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