{"schema":"threatline.record/2","record":{"id":"CVE-2026-93266","aliases":[],"summary":"arm64: RSI: fix field-spanning write warning in attestation token init","details":"In the Linux kernel, the following vulnerability has been resolved:\n\narm64: RSI: fix field-spanning write warning in attestation token init\n\nThe challenge is passed in registers a1 through a8. However, copying to\n&regs.a1 makes FORTIFY treat the destination as the single a1 field,\nresulting in a field-spanning write warning. [1]\n\nOverlay the SMCCC register structure with an RSI-specific argument\nlayout and copy the challenge into an explicit 64-byte array. This keeps\nthe existing a1-a8 argument encoding while giving the copy a correctly\nsized destination object.\n\n[1]\nmemcpy: detected field-spanning write (size 64) of single field \"&regs.a1\" at ./arch/arm64/include/asm/rsi_cmds.h:119 (size 8)\nWARNING: ./arch/arm64/include/asm/rsi_cmds.h:119 at rsi_attestation_token_init+0xdc/0xf8 [arm_cca_guest], CPU#0: cat/3314","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93266","source_modified_at":"2026-10-19T09:08:19.340Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"b880a80011f56880f32bde47fc6af313359f926b","lessThan":"e505092cb200d430d5b8d8d3e926d45f29474ba3","status":"affected","versionType":"git"},{"version":"b880a80011f56880f32bde47fc6af313359f926b","lessThan":"d29a8ee271da17b5e32d7a76a9c78d43f66447ca","status":"affected","versionType":"git"},{"version":"b880a80011f56880f32bde47fc6af313359f926b","lessThan":"221049874b6a78c7d87bc826581b0695cd338e2b","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93266","source_modified_at":"2026-10-19T09:08:19.340Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.13","status":"affected"},{"version":"0","lessThan":"6.13","status":"unaffected","versionType":"semver"},{"version":"6.18.52","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.6","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93266","source_modified_at":"2026-10-19T09:08:19.340Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"221049874b6a78c7d87bc826581b0695cd338e2b","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00184,"percentile":0.07596,"score_date":"2026-10-23"},"published_at":"2026-09-24T15:52:05.559Z","modified_at":"2026-10-19T09:08:19.340Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-93266","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:08:19.340Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-93266","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/e505092cb200d430d5b8d8d3e926d45f29474ba3"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/d29a8ee271da17b5e32d7a76a9c78d43f66447ca"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/221049874b6a78c7d87bc826581b0695cd338e2b"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:08:19.340Z","content_hash":"dbf74185ee977fd402e2a7c66d6056dc2647be2b54ada715336e5ecf526ddcdc"}}