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CVE Vulnerabilities

CVE-2025-9820

Stack-based Buffer Overflow

Published: Jan 26, 2026 | Modified: May 12, 2026
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
RedHat/V2
RedHat/V3
4 LOW
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Ubuntu
LOW
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2025-9820
CWEhttps://cwe.mitre.org/data/definitions/121.html

A flaw was found in the GnuTLS library, specifically in the gnutls_pkcs11_token_init() function that handles PKCS#11 token initialization. When a token label longer than expected is processed, the function writes past the end of a fixed-size stack buffer. This programming error can cause the application using GnuTLS to crash or, in certain conditions, be exploited for code execution. As a result, systems or applications relying on GnuTLS may be vulnerable to a denial of service or local privilege escalation attacks.

Weakness

A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

Affected Software

NameVendorStart VersionEnd Version
Red Hat Enterprise Linux 10RedHatgnutls-0:3.8.10-3.el10_1*
Red Hat Enterprise Linux 8RedHatgnutls-0:3.6.16-8.el8_10.5*
Red Hat Enterprise Linux 8RedHatgnutls-0:3.6.16-8.el8_10.5*
Red Hat Enterprise Linux 9RedHatgnutls-0:3.8.3-10.el9_7*
Red Hat Enterprise Linux 9RedHatgnutls-0:3.8.3-10.el9_7*
RHEL-8 based Middleware ContainersRedHatrhpam-7/rhpam-businesscentral-monitoring-rhel8:7.13.5-4.1777325677*
RHEL-8 based Middleware ContainersRedHatrhpam-7/rhpam-businesscentral-rhel8:7.13.5-4.1777325711*
RHEL-8 based Middleware ContainersRedHatrhpam-7/rhpam-controller-rhel8:7.13.5-4.1777325710*
RHEL-8 based Middleware ContainersRedHatrhpam-7/rhpam-dashbuilder-rhel8:7.13.5-3.1777325680*
RHEL-8 based Middleware ContainersRedHatrhpam-7/rhpam-kieserver-rhel8:7.13.5-4.1777325709*
RHEL-8 based Middleware ContainersRedHatrhpam-7/rhpam-process-migration-rhel8:7.13.5-4.1777325680*
RHEL-8 based Middleware ContainersRedHatrhpam-7/rhpam-smartrouter-rhel8:7.13.5-4.1777325708*
Red Hat Ceph Storage 8RedHatrhceph/rhceph-8-rhel9:1774002867*
Red Hat Discovery 2RedHatdiscovery/discovery-server-rhel9:1775668717*
Red Hat Discovery 2RedHatdiscovery/discovery-ui-rhel9:1775675922*
Red Hat Hardened ImagesRedHatgnutls-main-3.8.12-1.1.hum1*
Red Hat Insights proxy 1.5RedHatinsights-proxy/insights-proxy-container-rhel9:1773685509*
Red Hat Update Infrastructure 5RedHatrhui5/cds-rhel9:1773670073*
Red Hat Update Infrastructure 5RedHatrhui5/haproxy-rhel9:1773672059*
Red Hat Update Infrastructure 5RedHatrhui5/installer-rhel9:1773668803*
Red Hat Update Infrastructure 5RedHatrhui5/rhua-rhel9:1773670137*
Gnutls28Ubuntuesm-infra/xenial*
Gnutls28Ubuntufips-updates/jammy*
Gnutls28Ubuntufips-updates/noble*
Gnutls28Ubuntujammy*
Gnutls28Ubuntunoble*
Gnutls28Ubuntuplucky*
Gnutls28Ubuntuquesting*
Gnutls28Ubuntuupstream*

Potential Mitigations

  • Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index checking.
  • D3-SFCV (Stack Frame Canary Validation) from D3FEND [REF-1334] discusses canary-based detection in detail.
  • Run or compile the software using features or extensions that randomly arrange the positions of a program’s executable and libraries in memory. Because this makes the addresses unpredictable, it can prevent an attacker from reliably jumping to exploitable code.
  • Examples include Address Space Layout Randomization (ASLR) [REF-58] [REF-60] and Position-Independent Executables (PIE) [REF-64]. Imported modules may be similarly realigned if their default memory addresses conflict with other modules, in a process known as “rebasing” (for Windows) and “prelinking” (for Linux) [REF-1332] using randomly generated addresses. ASLR for libraries cannot be used in conjunction with prelink since it would require relocating the libraries at run-time, defeating the whole purpose of prelinking.
  • For more information on these techniques see D3-SAOR (Segment Address Offset Randomization) from D3FEND [REF-1335].

References

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