{"id":"CVE-2026-93266","revision":"8ca0d76be48c452db907455a5dfab5d5","records":[{"revision":"8ca0d76be48c452db907455a5dfab5d5","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-93266","aliases":[],"title":"arm64: RSI: fix field-spanning write warning in attestation token init","description":"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","state":0,"publishedAt":"2026-09-24T15:52:05.559+00:00","modifiedAt":"2026-10-19T09:08:19.34+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"arch/arm64/include/asm/rsi_cmds.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"b880a80011f56880f32bde47fc6af313359f926b\",\n                            \"lessThan\": \"e505092cb200d430d5b8d8d3e926d45f29474ba3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b880a80011f56880f32bde47fc6af313359f926b\",\n                            \"lessThan\": \"d29a8ee271da17b5e32d7a76a9c78d43f66447ca\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b880a80011f56880f32bde47fc6af313359f926b\",\n                            \"lessThan\": \"221049874b6a78c7d87bc826581b0695cd338e2b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"arch/arm64/include/asm/rsi_cmds.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.13\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.13\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.52\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.6\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/e505092cb200d430d5b8d8d3e926d45f29474ba3","https://git.kernel.org/stable/c/d29a8ee271da17b5e32d7a76a9c78d43f66447ca","https://git.kernel.org/stable/c/221049874b6a78c7d87bc826581b0695cd338e2b"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-93266","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-93266","identifiers":["CVE-2026-93266"]},"retained":false,"historicalAffected":[]}],"coverage":[]}