{"id":30625,"date":"2026-09-30T00:31:20","date_gmt":"2026-09-29T16:31:20","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-54875"},"modified":"2026-09-30T00:31:20","modified_gmt":"2026-09-29T16:31:20","slug":"cve-2026-54875","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-54875","title":{"rendered":"CVE-2026-54875 &#8211; Issue summary: A non-constant-time optimized implementation of scalar\npoint multiplication"},"content":{"rendered":"<p>Issue summary: A non-constant-time optimized implementation of scalar<br \/>\npoint multiplication is used for SM2 private key operations on ARM64 and<br \/>\nRISC-V platforms.<\/p>\n<p>Impact summary: An attacker able to measure the time taken by, or to observe<br \/>\nthe cache-line access pattern of SM2 signing or decryption on an affected<br \/>\nplatform can learn information about the secret scalar.<\/p>\n<p>CWE: CWE-208: Observable Timing Discrepancy<\/p>\n<p>Description: On ARM64 and RISC-V processors, the SM2 curve uses an optimized<br \/>\nscalar multiplication implementation whose conditional branches and table<br \/>\nlook ups are chosen according to the bits of the secret scalar. The execution<br \/>\ntime and the cache-access pattern therefore depend on the long-term private<br \/>\nkey (during SM2 decryption) or the per-signature nonce (during SM2 signature<br \/>\ngeneration), forming a timing and cache side-channel.<\/p>\n<p>FIPS Impact: no<br \/>\nSM2 is not a FIPS algorithm and the optimized SM2 implementation is not part<br \/>\nof the FIPS module.<\/p>\n<p>OpenSSL 4.0, 3.6, 3.5 and 3.4 are vulnerable to this issue on AArch64 and<br \/>\nRISC-V.<\/p>\n<p>OpenSSL 3.0, 1.1.1 and 1.0.2 are not affected by this issue.<\/p>\n<p>OpenSSL 4.0 users should upgrade to OpenSSL 4.0.3.<br \/>\nOpenSSL 3.6 users should upgrade to OpenSSL 3.6.5.<br \/>\nOpenSSL 3.5 users should upgrade to OpenSSL 3.5.9.<br \/>\nOpenSSL 3.4 users should upgrade to OpenSSL 3.4.8.<\/p>\n<p>This issue was reported on 2 May 2026 by Abhinav Agarwal.<br \/>\nIt was independently reported on 6 June 2026 by Feng Xue.<br \/>\nThe fix was developed by Igor Ustinov.<\/p>\n<p>&#8212; cut (non-publishing metadata for internal use) &#8212;<br \/>\nReported by: Abhinav Agarwal, Feng Xue<br \/>\nFixed by: Igor Ustinov<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Issue summary: A non-constant-time optimized implementation of scalar<br \/>\npoint multiplication is used for SM2 private key operations on ARM64 and<br \/>\nRISC-V platforms.<\/p>\n<p>Impact summary: An attacker able to me<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-30625","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/30625","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=30625"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=30625"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=30625"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}