{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-11985","assignerOrgId":"e2e69745-5e70-4e92-8431-deb5529a81ad","state":"PUBLISHED","assignerShortName":"zephyr","dateReserved":"2026-06-11T14:04:09.251Z","datePublished":"2026-08-11T04:56:59.359Z","dateUpdated":"2026-08-11T17:55:22.188Z"},"containers":{"cna":{"providerMetadata":{"orgId":"e2e69745-5e70-4e92-8431-deb5529a81ad","shortName":"zephyr","dateUpdated":"2026-08-11T04:56:59.359Z"},"title":"Cross-thread FPU register leak on ARM when FPU enabled without register sharing","descriptions":[{"lang":"en","value":"On the Zephyr ARM port, enabling the hardware FPU (CONFIG_FPU) forces the \"Floating point ABI\" choice, which defaults to CONFIG_FP_HARDABI. Both FP_HARDABI and FP_SOFTABI permit the compiler to emit hardware FP instructions in any function, even code that never uses floating-point types. However, the callee-saved FP registers (s16-s31 / d8-d15) are only saved and restored across a context switch when CONFIG_FPU_SHARING is enabled (arch/arm/core/cortex_m/swap_helper.S and arch/arm/core/cortex_a_r/swap_helper.S), and prior to this fix selecting an ABI did not enable FPU register sharing, which defaults off.\n\nIn a build that enables the FPU with the default ABI but leaves CONFIG_FPU_SHARING disabled, the kernel preserves no callee-saved FP register state across thread switches. The documented precondition for this \"unshared\" mode — that only a single thread ever executes FP instructions — is silently violated because the compiler may generate FP instructions in every thread.\n\nUnder CONFIG_USERSPACE, where threads are mutually isolated, this becomes an information-disclosure boundary crossing: a victim thread can leave secret-derived values in s16-s31, and a co-resident unprivileged thread can read those registers directly (FP register access is not privilege-gated), recovering data left behind by another thread. Without userspace the same defect causes cross-thread FP state corruption (a correctness fault). The leak is bounded to the 16 callee-saved single-precision registers and is opportunistic, so impact is low.\n\nThe fix makes FP_HARDABI and FP_SOFTABI select CONFIG_FPU_SHARING and tags every thread with K_FP_REGS at creation, so callee-saved FP state is always preserved across context switches whenever the compiler may emit FP instructions."}],"affected":[{"vendor":"zephyrproject","product":"zephyr","collectionURL":"https://github.com/zephyrproject-rtos/zephyr","packageName":"zephyr","defaultStatus":"unaffected","programFiles":["arch/Kconfig","arch/arm/core/Kconfig","arch/arm/core/cortex_a_r/thread.c","arch/arm/core/cortex_m/thread.c"],"versions":[{"version":"1.13.0","status":"affected","versionType":"semver","lessThanOrEqual":"4.4.1"}]}],"references":[{"url":"https://github.com/zephyrproject-rtos/zephyr/commit/3d405326a7653cba6860280e45c8734f8d3fc423","name":"Fix commit","tags":["patch"]},{"url":"https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-qxr9-wh3c-hvgv","name":"GHSA-qxr9-wh3c-hvgv"}],"metrics":[{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","baseScore":3.6,"baseSeverity":"LOW"}}],"problemTypes":[{"descriptions":[{"lang":"en","description":"info-leak","cweId":"CWE-200","type":"CWE"}]}],"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-11T17:55:04.091131Z","id":"CVE-2026-11985","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":"2026-08-11T17:55:22.188Z"}}]}}