CVE-2022-50206 (GCVE-0-2022-50206)

Vulnerability from cvelistv5 – Published: 2025-06-18 11:03 – Updated: 2025-12-20 08:50
VLAI?
Title
arm64: fix oops in concurrently setting insn_emulation sysctls
Summary
In the Linux kernel, the following vulnerability has been resolved: arm64: fix oops in concurrently setting insn_emulation sysctls emulation_proc_handler() changes table->data for proc_dointvec_minmax and can generate the following Oops if called concurrently with itself: | Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010 | Internal error: Oops: 96000006 [#1] SMP | Call trace: | update_insn_emulation_mode+0xc0/0x148 | emulation_proc_handler+0x64/0xb8 | proc_sys_call_handler+0x9c/0xf8 | proc_sys_write+0x18/0x20 | __vfs_write+0x20/0x48 | vfs_write+0xe4/0x1d0 | ksys_write+0x70/0xf8 | __arm64_sys_write+0x20/0x28 | el0_svc_common.constprop.0+0x7c/0x1c0 | el0_svc_handler+0x2c/0xa0 | el0_svc+0x8/0x200 To fix this issue, keep the table->data as &insn->current_mode and use container_of() to retrieve the insn pointer. Another mutex is used to protect against the current_mode update but not for retrieving insn_emulation as table->data is no longer changing.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 0be7320a635c2e434e8b67e0e9474a85ceb421c4 , < 9d5fec6ba2e4117d196a8259ab54615ffe562460 (git)
Affected: 0be7320a635c2e434e8b67e0e9474a85ceb421c4 , < b51881b1da57fe9877125dfdd0aac5172958fcfd (git)
Affected: 0be7320a635c2e434e8b67e0e9474a85ceb421c4 , < 04549063d5701976034d8c2bfda3d3a8cbf0409f (git)
Affected: 0be7320a635c2e434e8b67e0e9474a85ceb421c4 , < 353b4673d01c512303c45cf2346f630cda73b5c9 (git)
Affected: 0be7320a635c2e434e8b67e0e9474a85ceb421c4 , < cc69ef95988b9ef2fc730ec452a7441efb90ef5e (git)
Affected: 0be7320a635c2e434e8b67e0e9474a85ceb421c4 , < 6a2fd114678d7fc1b5a0f8865ae98f1c17787455 (git)
Affected: 0be7320a635c2e434e8b67e0e9474a85ceb421c4 , < 07022e07017ee5540f5559b0aeb916e8383c1e1a (git)
Affected: 0be7320a635c2e434e8b67e0e9474a85ceb421c4 , < af483947d472eccb79e42059276c4deed76f99a6 (git)
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    Linux Linux Affected: 3.7
Unaffected: 0 , < 3.7 (semver)
Unaffected: 4.14.291 , ≤ 4.14.* (semver)
Unaffected: 4.19.256 , ≤ 4.19.* (semver)
Unaffected: 5.4.211 , ≤ 5.4.* (semver)
Unaffected: 5.10.137 , ≤ 5.10.* (semver)
Unaffected: 5.15.61 , ≤ 5.15.* (semver)
Unaffected: 5.18.18 , ≤ 5.18.* (semver)
Unaffected: 5.19.2 , ≤ 5.19.* (semver)
Unaffected: 6.0 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
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      "cpeApplicability": [
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: fix oops in concurrently setting insn_emulation sysctls\n\nemulation_proc_handler() changes table-\u003edata for proc_dointvec_minmax\nand can generate the following Oops if called concurrently with itself:\n\n | Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010\n | Internal error: Oops: 96000006 [#1] SMP\n | Call trace:\n | update_insn_emulation_mode+0xc0/0x148\n | emulation_proc_handler+0x64/0xb8\n | proc_sys_call_handler+0x9c/0xf8\n | proc_sys_write+0x18/0x20\n | __vfs_write+0x20/0x48\n | vfs_write+0xe4/0x1d0\n | ksys_write+0x70/0xf8\n | __arm64_sys_write+0x20/0x28\n | el0_svc_common.constprop.0+0x7c/0x1c0\n | el0_svc_handler+0x2c/0xa0\n | el0_svc+0x8/0x200\n\nTo fix this issue, keep the table-\u003edata as \u0026insn-\u003ecurrent_mode and\nuse container_of() to retrieve the insn pointer. Another mutex is\nused to protect against the current_mode update but not for retrieving\ninsn_emulation as table-\u003edata is no longer changing."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-20T08:50:53.968Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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        },
        {
          "url": "https://git.kernel.org/stable/c/af483947d472eccb79e42059276c4deed76f99a6"
        }
      ],
      "title": "arm64: fix oops in concurrently setting insn_emulation sysctls",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50206",
    "datePublished": "2025-06-18T11:03:46.505Z",
    "dateReserved": "2025-06-18T10:57:27.428Z",
    "dateUpdated": "2025-12-20T08:50:53.968Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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