CVE-2025-38586

Description

In the Linux kernel, the following vulnerability has been resolved: bpf, arm64: Fix fp initialization for exception boundary In the ARM64 BPF JIT when prog->aux->exception_boundary is set for a BPF program, find_used_callee_regs() is not called because for a program acting as exception boundary, all callee saved registers are saved. find_used_callee_regs() sets `ctx->fp_used = true;` when it sees FP being used in any of the instructions. For programs acting as exception boundary, ctx->fp_used remains false even if frame pointer is used by the program and therefore, FP is not set-up for such programs in the prologue. This can cause the kernel to crash due to a pagefault. Fix it by setting ctx->fp_used = true for exception boundary programs as fp is always saved in such programs.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

References

• https://git.kernel.org/stable/c/0dbef493cae7d451f740558665893c000adb2321 ↗
• https://git.kernel.org/stable/c/e23184725dbb72d5d02940222eee36dbba2aa422 ↗
• https://git.kernel.org/stable/c/1ce30231e0a2c8c361ee5f8f7f265fc17130adce ↗
• https://git.kernel.org/stable/c/b114fcee766d5101eada1aca7bb5fd0a86c89b35 ↗