CVE-2025-38586 (GCVE-0-2025-38586)

Vulnerability from cvelistv5 – Published: 2025-08-19 17:03 – Updated: 2025-09-29 05:54
VLAI?
Title
bpf, arm64: Fix fp initialization for exception boundary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 5d4fa9ec5643a5c75d3c1e6abf50fb9284caf1ff , < 0dbef493cae7d451f740558665893c000adb2321 (git)
Affected: 5d4fa9ec5643a5c75d3c1e6abf50fb9284caf1ff , < e23184725dbb72d5d02940222eee36dbba2aa422 (git)
Affected: 5d4fa9ec5643a5c75d3c1e6abf50fb9284caf1ff , < 1ce30231e0a2c8c361ee5f8f7f265fc17130adce (git)
Affected: 5d4fa9ec5643a5c75d3c1e6abf50fb9284caf1ff , < b114fcee766d5101eada1aca7bb5fd0a86c89b35 (git)
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    Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 6.12.42 , ≤ 6.12.* (semver)
Unaffected: 6.15.10 , ≤ 6.15.* (semver)
Unaffected: 6.16.1 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/net/bpf_jit_comp.c"
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                  "vulnerable": true
                },
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-29T05:54:18.300Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0dbef493cae7d451f740558665893c000adb2321"
        },
        {
          "url": "https://git.kernel.org/stable/c/e23184725dbb72d5d02940222eee36dbba2aa422"
        },
        {
          "url": "https://git.kernel.org/stable/c/1ce30231e0a2c8c361ee5f8f7f265fc17130adce"
        },
        {
          "url": "https://git.kernel.org/stable/c/b114fcee766d5101eada1aca7bb5fd0a86c89b35"
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      ],
      "title": "bpf, arm64: Fix fp initialization for exception boundary",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38586",
    "datePublished": "2025-08-19T17:03:08.012Z",
    "dateReserved": "2025-04-16T04:51:24.026Z",
    "dateUpdated": "2025-09-29T05:54:18.300Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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