CVE-2026-18938: Heap-based Buffer Overflow in Red Hat Red Hat Enterprise Linux 10
CVE-2026-18938 is a heap-based buffer overflow vulnerability in the p11-kit component of Red Hat Enterprise Linux 10 on 32-bit systems. It arises from an integer overflow that causes incorrect memory allocation for nested attributes during RPC parsing, leading to heap out-of-bounds writes. This can crash the p11-kit RPC parsing process, resulting in a denial of service (DoS). The vulnerability requires local access or equivalent access to a reachable RPC channel and does not affect confidentiality or integrity. No patch or mitigation currently meets Red Hat's criteria for deployment.
AI Analysis
Technical Summary
This vulnerability in p11-kit involves an integer overflow during the calculation of attribute array lengths in RPC messages on 32-bit Red Hat Enterprise Linux 10 systems. By sending specially crafted messages, an attacker with local or equivalent RPC channel access can cause the system to under-allocate memory for nested attributes, resulting in a heap out-of-bounds write. This memory corruption leads to a crash of the p11-kit RPC parsing process, causing denial of service. The vulnerability does not impact confidentiality or integrity but affects availability. Red Hat has not provided an official fix or mitigation that meets their criteria for ease of use, applicability, or stability.
Potential Impact
The vulnerability allows an attacker with local or equivalent RPC channel access on 32-bit systems to cause a denial of service by crashing the p11-kit RPC parsing process through heap memory corruption. There is no impact on confidentiality or integrity. No known exploits are reported in the wild. The CVSS v3.1 score is 6.2 (medium severity) with an availability impact only.
Mitigation Recommendations
Red Hat currently does not offer a fix or mitigation that meets their criteria for deployment. Users should monitor the Red Hat advisory for updates. Since no official patch or mitigation is available, affected users should consider limiting access to the RPC channel or using 64-bit systems where the vulnerability is not exploitable.
CVE-2026-18938: Heap-based Buffer Overflow in Red Hat Red Hat Enterprise Linux 10
Description
CVE-2026-18938 is a heap-based buffer overflow vulnerability in the p11-kit component of Red Hat Enterprise Linux 10 on 32-bit systems. It arises from an integer overflow that causes incorrect memory allocation for nested attributes during RPC parsing, leading to heap out-of-bounds writes. This can crash the p11-kit RPC parsing process, resulting in a denial of service (DoS). The vulnerability requires local access or equivalent access to a reachable RPC channel and does not affect confidentiality or integrity. No patch or mitigation currently meets Red Hat's criteria for deployment.
CVSS v3.1
Score 6.2medium
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in p11-kit involves an integer overflow during the calculation of attribute array lengths in RPC messages on 32-bit Red Hat Enterprise Linux 10 systems. By sending specially crafted messages, an attacker with local or equivalent RPC channel access can cause the system to under-allocate memory for nested attributes, resulting in a heap out-of-bounds write. This memory corruption leads to a crash of the p11-kit RPC parsing process, causing denial of service. The vulnerability does not impact confidentiality or integrity but affects availability. Red Hat has not provided an official fix or mitigation that meets their criteria for ease of use, applicability, or stability.
Potential Impact
The vulnerability allows an attacker with local or equivalent RPC channel access on 32-bit systems to cause a denial of service by crashing the p11-kit RPC parsing process through heap memory corruption. There is no impact on confidentiality or integrity. No known exploits are reported in the wild. The CVSS v3.1 score is 6.2 (medium severity) with an availability impact only.
Mitigation Recommendations
Red Hat currently does not offer a fix or mitigation that meets their criteria for deployment. Users should monitor the Red Hat advisory for updates. Since no official patch or mitigation is available, affected users should consider limiting access to the RPC channel or using 64-bit systems where the vulnerability is not exploitable.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-08-05T12:44:08.706Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-18938","vendor":"Red Hat"}]
Threat ID: 6a759a47bf8831d539075a55
Added to database: 08/07/2026, 08:41:43 UTC
Last enriched: 08/07/2026, 09:00:15 UTC
Last updated: 08/07/2026, 09:02:04 UTC
Views: 4
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