CVE-2025-38586

Summary

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.

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/0dbef493cae7d451f740558665893c000adb2321 ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/0dbef493cae7d451f740558665893c000adb2321Patch
• https://git.kernel.org/stable/c/1ce30231e0a2c8c361ee5f8f7f265fc17130adcePatch
• https://git.kernel.org/stable/c/b114fcee766d5101eada1aca7bb5fd0a86c89b35Patch
• https://git.kernel.org/stable/c/e23184725dbb72d5d02940222eee36dbba2aa422Patch