suse-su-2026:4278-1
MEDIUM CVSS 5.9 csaf_suse
Description
Security update for libtpms
Timeline
- Published
- 2026-09-22 08:31 UTC
- Last Modified
- 2026-09-23
CVSS Details
CVSS details not available.
Affected Products
No product information available.
References
No references available.
Linked Vulnerabilities
No linked vulnerabilities found.
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"text": "Libtpms is a library that targets the integration of TPM functionality into hypervisors, primarily into Qemu. Libtpms, which is derived from the TPM 2.0 reference implementation code published by the Trusted Computing Group, is prone to a potential out of bounds (OOB) read vulnerability. The vulnerability occurs in the 'CryptHmacSign' function with an inconsistent pairing of the signKey and signScheme parameters, where the signKey is ALG_KEYEDHASH key and inScheme is an ECC or RSA scheme. The reported vulnerability is in the 'CryptHmacSign' function, which is defined in the \"Part 4: Supporting Routines - Code\" document, section \"7.151 - /tpm/src/crypt/CryptUtil.c \". This vulnerability can be triggered from user-mode applications by sending malicious commands to a TPM 2.0/vTPM (swtpm) whose firmware is based on an affected TCG reference implementation. The effect on libtpms is that it will cause an abort due to the detection of the out-of-bounds access, thus for example making a vTPM (swtpm) unavailable to a VM. This vulnerability is fixed in 0.7.12, 0.8.10, 0.9.7, and 0.10.1.",
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],
"threats": [
{
"category": "impact",
"date": "2026-09-22T08:31:49Z",
"details": "moderate"
}
],
"title": "CVE-2025-49133"
},
{
"cve": "CVE-2026-85769",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-85769"
}
],
"notes": [
{
"category": "general",
"text": "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.",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
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},
"references": [
{
"category": "external",
"summary": "CVE-2026-85769",
"url": "https://www.suse.com/security/cve/CVE-2026-85769"
},
{
"category": "external",
"summary": "SUSE Bug 1279628 for CVE-2026-85769",
"url": "https://bugzilla.suse.com/1279628"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
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}
],
"scores": [
{
"cvss_v3": {
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
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"threats": [
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"category": "impact",
"date": "2026-09-22T08:31:49Z",
"details": "moderate"
}
],
"title": "CVE-2026-85769"
}
]
}