CVE-2025-38169 (GCVE-0-2025-38169)

Vulnerability from cvelistv5 – Published: 2025-07-03 08:36 – Updated: 2025-07-28 04:14
VLAI?
Title
arm64/fpsimd: Avoid clobbering kernel FPSIMD state with SMSTOP
Summary
In the Linux kernel, the following vulnerability has been resolved: arm64/fpsimd: Avoid clobbering kernel FPSIMD state with SMSTOP On system with SME, a thread's kernel FPSIMD state may be erroneously clobbered during a context switch immediately after that state is restored. Systems without SME are unaffected. If the CPU happens to be in streaming SVE mode before a context switch to a thread with kernel FPSIMD state, fpsimd_thread_switch() will restore the kernel FPSIMD state using fpsimd_load_kernel_state() while the CPU is still in streaming SVE mode. When fpsimd_thread_switch() subsequently calls fpsimd_flush_cpu_state(), this will execute an SMSTOP, causing an exit from streaming SVE mode. The exit from streaming SVE mode will cause the hardware to reset a number of FPSIMD/SVE/SME registers, clobbering the FPSIMD state. Fix this by calling fpsimd_flush_cpu_state() before restoring the kernel FPSIMD state.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e92bee9f861b466c676f0200be3e46af7bc4ac6b , < 55d52af498daea75aa03ba9b7e444c8ae495ac20 (git)
Affected: e92bee9f861b466c676f0200be3e46af7bc4ac6b , < a305821f597ec943849d3e53924adb88c61ed682 (git)
Affected: e92bee9f861b466c676f0200be3e46af7bc4ac6b , < 01098d893fa8a6edb2b56e178b798e3e6b674f02 (git)
Affected: e003c485ac82a9f8de4204912ed059ac6dd4257c (git)
Affected: 25b90cd122d546823da90b916f7c3289dfe83a99 (git)
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    Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.12.34 , ≤ 6.12.* (semver)
Unaffected: 6.15.3 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/kernel/fpsimd.c"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64/fpsimd: Avoid clobbering kernel FPSIMD state with SMSTOP\n\nOn system with SME, a thread\u0027s kernel FPSIMD state may be erroneously\nclobbered during a context switch immediately after that state is\nrestored. Systems without SME are unaffected.\n\nIf the CPU happens to be in streaming SVE mode before a context switch\nto a thread with kernel FPSIMD state, fpsimd_thread_switch() will\nrestore the kernel FPSIMD state using fpsimd_load_kernel_state() while\nthe CPU is still in streaming SVE mode. When fpsimd_thread_switch()\nsubsequently calls fpsimd_flush_cpu_state(), this will execute an\nSMSTOP, causing an exit from streaming SVE mode. The exit from\nstreaming SVE mode will cause the hardware to reset a number of\nFPSIMD/SVE/SME registers, clobbering the FPSIMD state.\n\nFix this by calling fpsimd_flush_cpu_state() before restoring the kernel\nFPSIMD state."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T04:14:09.744Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/55d52af498daea75aa03ba9b7e444c8ae495ac20"
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        {
          "url": "https://git.kernel.org/stable/c/a305821f597ec943849d3e53924adb88c61ed682"
        },
        {
          "url": "https://git.kernel.org/stable/c/01098d893fa8a6edb2b56e178b798e3e6b674f02"
        }
      ],
      "title": "arm64/fpsimd: Avoid clobbering kernel FPSIMD state with SMSTOP",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38169",
    "datePublished": "2025-07-03T08:36:08.393Z",
    "dateReserved": "2025-04-16T04:51:23.991Z",
    "dateUpdated": "2025-07-28T04:14:09.744Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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