CVE-2026-24882

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{"bugzilla": {"description": "GnuPG: GnuPG: Stack-based buffer overflow in tpm2daemon allows arbitrary code execution", "id": "2433464", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2433464"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-121", "details": ["A flaw was found in GnuPG. This vulnerability, a stack-based buffer overflow, occurs in the `tpm2daemon` component when processing PKDECRYPT commands for cryptographic keys secured by a Trusted Platform Module (TPM). A local attacker could exploit this to execute unauthorized code, potentially gaining full control of the system, or disrupt its operation, leading to a denial of service."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-24882", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "gnupg2", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Affected", "package_name": "gnupg2", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "gnupg2", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "gnupg2", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "gnupg2", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-01-27T18:40:18Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-24882\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-24882\nhttps://dev.gnupg.org/T8045\nhttps://www.openwall.com/lists/oss-security/2026/01/27/8"], "statement": "This is an IMPORTANT vulnerability in GnuPG's tpm2daemon, affecting systems configured to use TPM-backed RSA and ECC keys. A stack-based buffer overflow can occur when processing PKDECRYPT commands, potentially leading to denial of service or arbitrary code execution. Red Hat Enterprise Linux and Fedora systems are impacted if utilizing TPM-backed keys with GnuPG.", "threat_severity": "Important"}

{"analysis": {"en": {"generated_at": "2026-04-18T01:59:02.354204+00:00", "value": {"mitigation_remediation": ["Upgrade GnuPG to version 2.5.17 or later, which contains the buffer overflow fix.", "If an immediate upgrade is not possible, reduce the exposure by limiting the use of TPM-backed RSA/ECC keys or disabling the PKDECRYPT functionality in tpm2daemon if configuration options exist.", "Monitor the environment for signs of exploitation, such as unexpected process creation or use of the tpm2daemon binary, and apply least\u2011privilege mitigations by running the daemon with minimal permissions until a patch is available."], "summary": {"action": "Patch Now", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "The flaw applies to GnuPG versions prior to 2.5.17, including any Linux or Windows deployments that use GPG4Win, which incorporates the same vulnerable GnuPG libraries. Systems that rely on TPM\u2011backed RSA or ECC keys and invoke the PKDECRYPT command are at risk. No specific sub\u2011commitment or patch level is mentioned in the CVE data; it is safe to assume all releases below 2.5.17 are affected.", "description_and_impact": "The vulnerability is a stack-based buffer overflow in the tpm2daemon component of GnuPG, triggered during processing of the PKDECRYPT command for TPM-backed RSA and ECC keys. The overflow allows an attacker to overwrite adjacent memory on the stack, leading to arbitrary code execution. If successful, the attacker could execute arbitrary instructions with the privileges of the tpm2daemon process, potentially compromising system integrity, confidentiality, and availability.", "risk_and_exploitability": "The CVSS score of 8.4 indicates a high severity vulnerability. The EPSS score is below 1%, suggesting a low probability of exploitation in the wild at this time. The vulnerability is not currently listed in the CISA KEV catalog. Because tpm2daemon runs with elevated privileges to manage TPM functions, the attack vector is inferred to be local or remote depending on how the PKDECRYPT command is invoked; a threat actor would need to drive the vulnerable command into the daemon, possibly through crafted input data or malicious key usage. Overall, the risk is high and the vulnerability should be addressed promptly."}}}}, "created": "2026-01-28T12:22:03.244324+00:00", "updated": "2026-04-18T02:00:10.474324+00:00", "vendors": ["gnupg", "gnupg$PRODUCT$gnupg"]}