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CVE-2026-85769— Libtpms: libtpms: heap out-of-bounds read in tpm2 state unmarshalling via unchecked block_skip_read() blocksize

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

（一个提供软件 TPM 2.0 模拟的库）中发现了缺陷。在恢复 TPM 2.0 状态时（例如在虚拟机开机或状态/迁移恢复过程中），一个格式错误的状态数据块可能提供一个过大的“跳过块长度”（skip-block length），而该长度未与输入缓冲区的剩余大小进行校验。这会导致内部大小计数器变为负值，并由于不安全的有符号转无符号转换，绕过了后续的边界检查，从而使解析器读取了保存状态数据的堆缓冲区之外的内存。成功利用该漏洞可以导致托管 libtpms 的进程（如 ）崩溃，进而造成所模拟的 TPM 设备及其依赖的虚拟机发

CVSS 6.5 · Medium

Affected Version Matrix 3

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
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I. Basic Information for CVE-2026-85769

Vulnerability Information
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Vulnerability Title
Libtpms: libtpms: heap out-of-bounds read in tpm2 state unmarshalling via unchecked block_skip_read() blocksize
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
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

II. Public POCs for CVE-2026-85769

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III. Intelligence Information for CVE-2026-85769

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Patches & Fixes for CVE-2026-85769 (1)

Vendor Advisories for CVE-2026-85769 (1)

Other References for CVE-2026-85769 (1)

Other References for CVE-2026-85769 (1)

Same Patch Batch · Red Hat · 2026-09-04 · 6 CVEs total

CVE-2026-85197 7.6 HIGH Libsoup: libsoup: heap use-after-free in libsoup http/2 client on_data_read() via goaway d
CVE-2026-81665 7.5 HIGH Corosync: corosync: heap-based buffer overflow in totempg assembly buffer during fragmente
CVE-2026-81666 6.5 MEDIUM Corosync: corosync: integer overflow in check_memb_commit_token_sanity may bypass message
CVE-2026-85534 5.9 MEDIUM Libsoup: libsoup: http/2 client crash in on_data_source_read_callback when settings initia
CVE-2026-76925 5.8 MEDIUM Flatpak: flatpak: toctou race condition allows symlink redirection

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-125

V. Comments for CVE-2026-85769

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