Riskcovery

CVE-2025-38586

bpf, arm64: Fix fp initialization for exception boundary

State
Published
Severity
7.8 High
Published
Aug 19, 2025
Updated
Oct 15, 2026
Reserved
Apr 16, 2025

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 5d4fa9ec5643a5c75d3c1e6abf50fb9284caf1ff to before 0dbef493cae7d451f740558665893c000adb2321Affected
  • 5d4fa9ec5643a5c75d3c1e6abf50fb9284caf1ff to before e23184725dbb72d5d02940222eee36dbba2aa422Affected
  • 5d4fa9ec5643a5c75d3c1e6abf50fb9284caf1ff to before 1ce30231e0a2c8c361ee5f8f7f265fc17130adceAffected
  • 5d4fa9ec5643a5c75d3c1e6abf50fb9284caf1ff to before b114fcee766d5101eada1aca7bb5fd0a86c89b35Affected
LinuxLinux
  • 6.12Affected
  • before 6.12Not affected
  • 6.12.42 through 6.12.*Not affected
  • 6.15.10 through 6.15.*Not affected
  • 6.16.1 through 6.16.*Not affected
  • 6.17 and laterNot affected

References

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