Description
When using Arm Cortex-M Security Extensions (CMSE), Secure stack
contents can be leaked to Non-secure state via floating-point registers
when a Secure to Non-secure function call is made that returns a
floating-point value and when this is the first use of floating-point
since entering Secure state. This allows an attacker to read a limited
quantity of Secure stack contents with an impact on confidentiality.
This issue is specific to code generated using LLVM-based compilers.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Arm | Arm Compiler for Embedded | 6.6 – ≤ 6.22 | — |
| Arm | Arm Compiler for Embedded FuSa 6.16LTS | All versions | — |
| Arm | Arm Compiler for Embedded FuSa 6.21 | All versions | — |
| Arm | Arm Compiler for Functional Safety 6.6 | All versions | — |
| Arm | CLang | 13 – ≤ 19 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 13 | llvm-toolchain-17 +2 | No fix yet | — |
| Debian 12 | llvm-toolchain-14 +3 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | llvm-toolchain-17 | No fix yet | — |
| Ubuntu 26.04 LTS | llvm-toolchain-17 | No fix yet | — |
| Ubuntu 25.10 | llvm-toolchain-14 +3 | No fix yet | — |
| Ubuntu 24.04 LTS | llvm-toolchain-14 +5 | No fix yet | — |
| Ubuntu 22.04 LTS | llvm-toolchain-11 +4 | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | llvm-toolchain-11 +2 | No fix yet | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | clang | 18.1.2-4 | — |