ghsa-rr3x-2w52-vv96
Vulnerability from github
Published
2025-08-19 18:31
Modified
2025-08-19 18:31
Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38586"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-08-19T17:15:36Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, arm64: Fix fp initialization for exception boundary\n\nIn the ARM64 BPF JIT when prog-\u003eaux-\u003eexception_boundary is set for a BPF\nprogram, find_used_callee_regs() is not called because for a program\nacting as exception boundary, all callee saved registers are saved.\nfind_used_callee_regs() sets `ctx-\u003efp_used = true;` when it sees FP\nbeing used in any of the instructions.\n\nFor programs acting as exception boundary, ctx-\u003efp_used remains false\neven if frame pointer is used by the program and therefore, FP is not\nset-up for such programs in the prologue. This can cause the kernel to\ncrash due to a pagefault.\n\nFix it by setting ctx-\u003efp_used = true for exception boundary programs as\nfp is always saved in such programs.",
  "id": "GHSA-rr3x-2w52-vv96",
  "modified": "2025-08-19T18:31:33Z",
  "published": "2025-08-19T18:31:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38586"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0dbef493cae7d451f740558665893c000adb2321"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1ce30231e0a2c8c361ee5f8f7f265fc17130adce"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b114fcee766d5101eada1aca7bb5fd0a86c89b35"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e23184725dbb72d5d02940222eee36dbba2aa422"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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