CVE-2026-54875 (GCVE-0-2026-54875)
Vulnerability from cvelistv5
Published
2026-09-29 15:32
Modified
2026-09-29 17:17
Severity ?
CWE
  • CWE-208 - Observable Timing Discrepancy
Summary
Issue summary: A non-constant-time optimized implementation of scalar point multiplication is used for SM2 private key operations on ARM64 and RISC-V platforms. Impact summary: An attacker able to measure the time taken by, or to observe the cache-line access pattern of SM2 signing or decryption on an affected platform can learn information about the secret scalar. CWE: CWE-208: Observable Timing Discrepancy Description: On ARM64 and RISC-V processors, the SM2 curve uses an optimized scalar multiplication implementation whose conditional branches and table look ups are chosen according to the bits of the secret scalar. The execution time and the cache-access pattern therefore depend on the long-term private key (during SM2 decryption) or the per-signature nonce (during SM2 signature generation), forming a timing and cache side-channel. FIPS Impact: no SM2 is not a FIPS algorithm and the optimized SM2 implementation is not part of the FIPS module. OpenSSL 4.0, 3.6, 3.5 and 3.4 are vulnerable to this issue on AArch64 and RISC-V. OpenSSL 3.0, 1.1.1 and 1.0.2 are not affected by this issue. OpenSSL 4.0 users should upgrade to OpenSSL 4.0.3. OpenSSL 3.6 users should upgrade to OpenSSL 3.6.5. OpenSSL 3.5 users should upgrade to OpenSSL 3.5.9. OpenSSL 3.4 users should upgrade to OpenSSL 3.4.8. This issue was reported on 2 May 2026 by Abhinav Agarwal. It was independently reported on 6 June 2026 by Feng Xue. The fix was developed by Igor Ustinov. -- cut (non-publishing metadata for internal use) -- Reported by: Abhinav Agarwal, Feng Xue Fixed by: Igor Ustinov
References
Impacted products
Vendor Product Version
OpenSSL OpenSSL Version: 4.0.0   ≤
Version: 3.6.0   ≤
Version: 3.5.0   ≤
Version: 3.4.0   ≤
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              "value": "Issue summary: A non-constant-time optimized implementation of scalar\u003cbr\u003epoint multiplication is used for SM2 private key operations on ARM64 and\u003cbr\u003eRISC-V platforms.\u003cbr\u003e\u003cbr\u003eImpact summary: An attacker able to measure the time taken by, or to observe\u003cbr\u003ethe cache-line access pattern of SM2 signing or decryption on an affected\u003cbr\u003eplatform can learn information about the secret scalar.\u003cbr\u003e\u003cbr\u003eCWE: CWE-208: Observable Timing Discrepancy\u003cbr\u003e\u003cbr\u003eDescription: On ARM64 and RISC-V processors, the SM2 curve uses an optimized\u003cbr\u003escalar multiplication implementation whose conditional branches and table\u003cbr\u003elook ups are chosen according to the bits of the secret scalar. The execution\u003cbr\u003etime and the cache-access pattern therefore depend on the long-term private\u003cbr\u003ekey (during SM2 decryption) or the per-signature nonce (during SM2 signature\u003cbr\u003egeneration), forming a timing and cache side-channel.\u003cbr\u003e\u003cbr\u003eFIPS Impact: no\u003cbr\u003eSM2 is not a FIPS algorithm and the optimized SM2 implementation is not part\u003cbr\u003eof the FIPS module.\u003cbr\u003e\u003cbr\u003eOpenSSL 4.0, 3.6, 3.5 and 3.4 are vulnerable to this issue on AArch64 and\u003cbr\u003eRISC-V.\u003cbr\u003e\u003cbr\u003eOpenSSL 3.0, 1.1.1 and 1.0.2 are not affected by this issue.\u003cbr\u003e\u003cbr\u003eOpenSSL 4.0 users should upgrade to OpenSSL 4.0.3.\u003cbr\u003eOpenSSL 3.6 users should upgrade to OpenSSL 3.6.5.\u003cbr\u003eOpenSSL 3.5 users should upgrade to OpenSSL 3.5.9.\u003cbr\u003eOpenSSL 3.4 users should upgrade to OpenSSL 3.4.8.\u003cbr\u003e\u003cbr\u003eThis issue was reported on 2 May 2026 by Abhinav Agarwal.\u003cbr\u003eIt was independently reported on 6 June 2026 by Feng Xue.\u003cbr\u003eThe fix was developed by Igor Ustinov.\u003cbr\u003e\u003cbr\u003e-- cut (non-publishing metadata for internal use) --\u003cbr\u003eReported by: Abhinav Agarwal, Feng Xue\u003cbr\u003eFixed by: Igor Ustinov"
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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\u003cbr\u003epoint multiplication is used for SM2 private key operations on ARM64 and\u003cbr\u003eRISC-V platforms.\u003cbr\u003e\u003cbr\u003eImpact summary: An attacker able to measure the time taken by, or to observe\u003cbr\u003ethe cache-line access pattern of SM2 signing or decryption on an affected\u003cbr\u003eplatform can learn information about the secret scalar.\u003cbr\u003e\u003cbr\u003eCWE: CWE-208: Observable Timing Discrepancy\u003cbr\u003e\u003cbr\u003eDescription: On ARM64 and RISC-V processors, the SM2 curve uses an optimized\u003cbr\u003escalar multiplication implementation whose conditional branches and table\u003cbr\u003elook ups are chosen according to the bits of the secret scalar. 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