Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: arm64/fpsimd: Avoid clobbering kernel FPSIMD state with SMSTOP On system with SME, a thread's kernel FPSIMD state may be erroneously clobbered during a context switch immediately after that state is restored. Systems without SME are unaffected. If the CPU happens to be in streaming SVE mode before a context switch to a thread with kernel FPSIMD state, fpsimd_thread_switch() will restore the kernel FPSIMD state using fpsimd_load_kernel_state() while the CPU is still in streaming SVE mode. When fpsimd_thread_switch() subsequently calls fpsimd_flush_cpu_state(), this will execute an SMSTOP, causing an exit from streaming SVE mode. The exit from streaming SVE mode will cause the hardware to reset a number of FPSIMD/SVE/SME registers, clobbering the FPSIMD state. Fix this by calling fpsimd_flush_cpu_state() before restoring the kernel FPSIMD state.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected e92bee9f861b466c676f0200be3e46af7bc4ac6b before 55d52af498daea75aa03ba9b7e444c8ae495ac20; affected e92bee9f861b466c676f0200be3e46af7bc4ac6b before a305821f597ec943849d3e53924adb88c61ed682; affected e92bee9f861b466c676f0200be3e46af7bc4ac6b before 01098d893fa8a6edb2b56e178b798e3e6b674f02; affected e003c485ac82a9f8de4204912ed059ac6dd4257c; affected 25b90cd122d546823da90b916f7c3289dfe83a99; affected 6.8.12 before 6.9; affected 6.9.3 before 6.10 |
| Linux / Linux | affected 6.10; unaffected 0 before 6.10; unaffected 6.12.34 through 6.12.*; unaffected 6.15.3 through 6.15.*; unaffected 6.16 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/55d52af498daea75aa03ba9b7e444c8ae495ac20
- https://git.kernel.org/stable/c/a305821f597ec943849d3e53924adb88c61ed682
- https://git.kernel.org/stable/c/01098d893fa8a6edb2b56e178b798e3e6b674f02
ADP enrichment
No English description supplied.
No references supplied.