CVE-2026-54875

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The execution<br>time and the cache-access pattern therefore depend on the long-term private<br>key (during SM2 decryption) or the per-signature nonce (during SM2 signature<br>generation), forming a timing and cache side-channel.<br><br>FIPS Impact: no<br>SM2 is not a FIPS algorithm and the optimized SM2 implementation is not part<br>of the FIPS module.<br><br>OpenSSL 4.0, 3.6, 3.5 and 3.4 are vulnerable to this issue on AArch64 and<br>RISC-V.<br><br>OpenSSL 3.0, 1.1.1 and 1.0.2 are not affected by this issue.<br><br>OpenSSL 4.0 users should upgrade to OpenSSL 4.0.3.<br>OpenSSL 3.6 users should upgrade to OpenSSL 3.6.5.<br>OpenSSL 3.5 users should upgrade to OpenSSL 3.5.9.<br>OpenSSL 3.4 users should upgrade to OpenSSL 3.4.8.<br><br>This issue was reported on 2 May 2026 by Abhinav Agarwal.<br>It was independently reported on 6 June 2026 by Feng Xue.<br>The fix was developed by Igor Ustinov.<br><br>-- cut (non-publishing metadata for internal use) --<br>Reported by: Abhinav Agarwal, Feng Xue<br>Fixed by: Igor Ustinov"}], "value": "Issue summary: A non-constant-time optimized implementation of scalar\npoint multiplication is used for SM2 private key operations on ARM64 and\nRISC-V platforms.\n\nImpact summary: An attacker able to measure the time taken by, or to observe\nthe cache-line access pattern of SM2 signing or decryption on an affected\nplatform can learn information about the secret scalar.\n\nCWE: CWE-208: Observable Timing Discrepancy\n\nDescription: On ARM64 and RISC-V processors, the SM2 curve uses an optimized\nscalar multiplication implementation whose conditional branches and table\nlook ups are chosen according to the bits of the secret scalar. The execution\ntime and the cache-access pattern therefore depend on the long-term private\nkey (during SM2 decryption) or the per-signature nonce (during SM2 signature\ngeneration), forming a timing and cache side-channel.\n\nFIPS Impact: no\nSM2 is not a FIPS algorithm and the optimized SM2 implementation is not part\nof the FIPS module.\n\nOpenSSL 4.0, 3.6, 3.5 and 3.4 are vulnerable to this issue on AArch64 and\nRISC-V.\n\nOpenSSL 3.0, 1.1.1 and 1.0.2 are not affected by this issue.\n\nOpenSSL 4.0 users should upgrade to OpenSSL 4.0.3.\nOpenSSL 3.6 users should upgrade to OpenSSL 3.6.5.\nOpenSSL 3.5 users should upgrade to OpenSSL 3.5.9.\nOpenSSL 3.4 users should upgrade to OpenSSL 3.4.8.\n\nThis issue was reported on 2 May 2026 by Abhinav Agarwal.\nIt was independently reported on 6 June 2026 by Feng Xue.\nThe fix was developed by Igor Ustinov.\n\n-- cut (non-publishing metadata for internal use) --\nReported by: Abhinav Agarwal, Feng Xue\nFixed by: Igor Ustinov"}], "metrics": [{"format": "other", "other": {"content": {"text": "Low"}, "type": "https://openssl-library.org/policies/general/security-policy/"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-208", "description": "CWE-208 Observable Timing Discrepancy", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "shortName": "openssl", "dateUpdated": "2026-09-29T15:32:17.206Z"}, "references": [{"name": "OpenSSL Advisory", "tags": ["vendor-advisory"], "url": "https://openssl-library.org/news/secadv/20260929.txt"}, {"name": "4.0.3 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/9794ed473764839275cb701b4850f3c24d929c28"}, {"name": "3.6.5 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/dddad955d5ff3e9507619cf4e0f13e9988e2197c"}, {"name": "3.5.9 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/469f3e42629f4a0b5631796e20c66c92c138a3e8"}, {"name": "3.4.8 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/3f01bbc28f7e08211fcdc797fd43816504f94257"}], "source": {"discovery": "UNKNOWN"}, "title": "Non-Constant-Time SM2 Scalar Multiplication on ARM64 and RISC-V", "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 3.7, "attackVector": "NETWORK", "baseSeverity": "LOW", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-09-29T17:17:05.164162Z", "id": "CVE-2026-54875", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-29T17:17:20.483Z"}}]}}

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The execution\ntime and the cache-access pattern therefore depend on the long-term private\nkey (during SM2 decryption) or the per-signature nonce (during SM2 signature\ngeneration), forming a timing and cache side-channel.\n\nFIPS Impact: no\nSM2 is not a FIPS algorithm and the optimized SM2 implementation is not part\nof the FIPS module.\n\nOpenSSL 4.0, 3.6, 3.5 and 3.4 are vulnerable to this issue on AArch64 and\nRISC-V.\n\nOpenSSL 3.0, 1.1.1 and 1.0.2 are not affected by this issue.\n\nOpenSSL 4.0 users should upgrade to OpenSSL 4.0.3.\nOpenSSL 3.6 users should upgrade to OpenSSL 3.6.5.\nOpenSSL 3.5 users should upgrade to OpenSSL 3.5.9.\nOpenSSL 3.4 users should upgrade to OpenSSL 3.4.8.\n\nThis issue was reported on 2 May 2026 by Abhinav Agarwal.\nIt was independently reported on 6 June 2026 by Feng Xue.\nThe fix was developed by Igor Ustinov.\n\n-- cut (non-publishing metadata for internal use) --\nReported by: Abhinav Agarwal, Feng Xue\nFixed by: Igor Ustinov", "supportingMedia": [{"type": "text/html", "value": "Issue summary: A non-constant-time optimized implementation of scalar<br>point multiplication is used for SM2 private key operations on ARM64 and<br>RISC-V platforms.<br><br>Impact summary: An attacker able to measure the time taken by, or to observe<br>the cache-line access pattern of SM2 signing or decryption on an affected<br>platform can learn information about the secret scalar.<br><br>CWE: CWE-208: Observable Timing Discrepancy<br><br>Description: On ARM64 and RISC-V processors, the SM2 curve uses an optimized<br>scalar multiplication implementation whose conditional branches and table<br>look ups are chosen according to the bits of the secret scalar. The execution<br>time and the cache-access pattern therefore depend on the long-term private<br>key (during SM2 decryption) or the per-signature nonce (during SM2 signature<br>generation), forming a timing and cache side-channel.<br><br>FIPS Impact: no<br>SM2 is not a FIPS algorithm and the optimized SM2 implementation is not part<br>of the FIPS module.<br><br>OpenSSL 4.0, 3.6, 3.5 and 3.4 are vulnerable to this issue on AArch64 and<br>RISC-V.<br><br>OpenSSL 3.0, 1.1.1 and 1.0.2 are not affected by this issue.<br><br>OpenSSL 4.0 users should upgrade to OpenSSL 4.0.3.<br>OpenSSL 3.6 users should upgrade to OpenSSL 3.6.5.<br>OpenSSL 3.5 users should upgrade to OpenSSL 3.5.9.<br>OpenSSL 3.4 users should upgrade to OpenSSL 3.4.8.<br><br>This issue was reported on 2 May 2026 by Abhinav Agarwal.<br>It was independently reported on 6 June 2026 by Feng Xue.<br>The fix was developed by Igor Ustinov.<br><br>-- cut (non-publishing metadata for internal use) --<br>Reported by: Abhinav Agarwal, Feng Xue<br>Fixed by: Igor Ustinov", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-208", "description": "CWE-208 Observable Timing Discrepancy"}]}], "providerMetadata": {"orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "shortName": "openssl", "dateUpdated": "2026-09-29T15:32:17.206Z"}}}, "cveMetadata": {"cveId": "CVE-2026-54875", "state": "PUBLISHED", "dateUpdated": "2026-09-29T17:17:20.483Z", "dateReserved": "2026-06-16T10:18:08.636Z", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "datePublished": "2026-09-29T15:32:17.206Z", "assignerShortName": "openssl"}, "dataVersion": "5.2"}

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The execution\ntime and the cache-access pattern therefore depend on the long-term private\nkey (during SM2 decryption) or the per-signature nonce (during SM2 signature\ngeneration), forming a timing and cache side-channel.\n\nFIPS Impact: no\nSM2 is not a FIPS algorithm and the optimized SM2 implementation is not part\nof the FIPS module.\n\nOpenSSL 4.0, 3.6, 3.5 and 3.4 are vulnerable to this issue on AArch64 and\nRISC-V.\n\nOpenSSL 3.0, 1.1.1 and 1.0.2 are not affected by this issue.\n\nOpenSSL 4.0 users should upgrade to OpenSSL 4.0.3.\nOpenSSL 3.6 users should upgrade to OpenSSL 3.6.5.\nOpenSSL 3.5 users should upgrade to OpenSSL 3.5.9.\nOpenSSL 3.4 users should upgrade to OpenSSL 3.4.8.\n\nThis issue was reported on 2 May 2026 by Abhinav Agarwal.\nIt was independently reported on 6 June 2026 by Feng Xue.\nThe fix was developed by Igor Ustinov.\n\n-- cut (non-publishing metadata for internal use) --\nReported by: Abhinav Agarwal, Feng Xue\nFixed by: Igor Ustinov"}], "id": "CVE-2026-54875", "lastModified": "2026-10-08T01:19:29.883", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 1.4, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-54875", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-29T17:17:05.164162Z", "version": "2.0.3"}}]}, "published": "2026-09-29T16:17:08.920", "references": [{"source": "openssl-security@openssl.org", "tags": ["Patch"], "url": "https://github.com/openssl/openssl/commit/3f01bbc28f7e08211fcdc797fd43816504f94257"}, {"source": "openssl-security@openssl.org", "tags": ["Patch"], "url": "https://github.com/openssl/openssl/commit/469f3e42629f4a0b5631796e20c66c92c138a3e8"}, {"source": "openssl-security@openssl.org", "tags": ["Patch"], "url": "https://github.com/openssl/openssl/commit/9794ed473764839275cb701b4850f3c24d929c28"}, {"source": "openssl-security@openssl.org", "tags": ["Patch"], "url": "https://github.com/openssl/openssl/commit/dddad955d5ff3e9507619cf4e0f13e9988e2197c"}, {"source": "openssl-security@openssl.org", "tags": ["Vendor Advisory"], "url": "https://openssl-library.org/news/secadv/20260929.txt"}], "sourceIdentifier": "openssl-security@openssl.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-208"}], "source": "openssl-security@openssl.org", "type": "Secondary"}]}

{"bugzilla": {"description": "openssl: openssl: information disclosure via non-constant-time SM2 scalar multiplication on ARM64 and RISC-V", "id": "2543256", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543256"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-208", "details": ["A flaw was found in OpenSSL. The optimized scalar point multiplication used for SM2 cryptographic operations on ARM64 and RISC-V architectures does not execute in constant time. An attacker capable of measuring execution times or observing processor cache-access patterns can exploit this side channel during decryption or digital signature generation. This vulnerability allows the attacker to deduce sensitive private keys or signature nonces, leading to information disclosure."], "name": "CVE-2026-54875", "package_state": [{"cpe": "cpe:/a:redhat:rhdh:1", "fix_state": "Fix deferred", "package_name": "rhdh/rhdh-hub-rhel9", "product_name": "Red Hat Developer Hub"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "edk2", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "shim", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "shim-unsigned-aarch64", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "shim-unsigned-x64", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "ovmf", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "shim-signed", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "compat-openssl10", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "edk2", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "mingw-openssl", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "shim", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "shim-unsigned-aarch64", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "shim-unsigned-x64", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "compat-openssl11", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "edk2", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "shim", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "shim-unsigned-aarch64", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "shim-unsigned-x64", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "openssl3", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "unbound", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:jboss_core_services:1", "fix_state": "Fix deferred", "package_name": "jbcs-httpd24-openssl", "product_name": "Red Hat JBoss Core Services"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "openvox-agent", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "puppet-agent", "product_name": "Red Hat Satellite 6"}], "public_date": "2026-09-29T15:32:17Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-54875\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-54875\nhttps://github.com/openssl/openssl/commit/3f01bbc28f7e08211fcdc797fd43816504f94257\nhttps://github.com/openssl/openssl/commit/469f3e42629f4a0b5631796e20c66c92c138a3e8\nhttps://github.com/openssl/openssl/commit/9794ed473764839275cb701b4850f3c24d929c28\nhttps://github.com/openssl/openssl/commit/dddad955d5ff3e9507619cf4e0f13e9988e2197c\nhttps://openssl-library.org/news/secadv/20260929.txt"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.0.0,4.0.3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.6.0,3.6.5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.5.0,3.5.9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.4.0,3.4.8)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "OpenSSL", "source": "cna", "vendor": "OpenSSL"}, "product": "openssl", "vendor": "openssl"}], "created": "2026-09-29T17:30:17.063309+00:00", "updated": "2026-09-30T01:15:04.785617+00:00", "vendors": ["openssl", "openssl$PRODUCT$openssl"]}