{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-93167",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-93167",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-09-17T16:11:59.234Z",
    "updatedAt": "2026-10-19T09:06:39.063Z",
    "importedAt": "2026-10-24T01:58:35.090Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "csky: Fix a4/a5 restoration in syscall trace path",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ncsky: Fix a4/a5 restoration in syscall trace path\n\nThe syscall trace path reloads syscall arguments from pt_regs before\ncalling the syscall handler. On C-SKY ABIv2, the 5th and 6th syscall\narguments are prepared as stack arguments before invoking syscallid.\n\nThe current code adjusts sp before loading LSAVE_A4 and LSAVE_A5. Since\nthose offsets are relative to the original pt_regs base, loading them\nafter changing sp fetches the wrong slots. As a result, traced syscalls\nthat use the 5th or 6th argument may receive corrupted arguments.\n\nThis is visible with mmap2(), which takes six arguments. A small\nPTRACE_SYSCALL reproducer opens a file and maps one page with:\n\n  mmap(NULL, 4096, PROT_READ | PROT_EXEC, MAP_PRIVATE, fd, 0)\n\nBefore the fix, the traced child fails the mmap and exits with 12.\nAfter the fix, the mapping succeeds and the child exits with 0.\n\nFix the trace path by loading a4/a5 from pt_regs before changing sp.\n\nTested on: ck860f, linux-4.19.15, C-SKY abiv2",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "e0bbb53843b5fdfe464b099217e3b9d97e8a75d7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e9ae8e86eed68bea5d2670eadf61938a43bd2263"
            },
            {
              "version": "e0bbb53843b5fdfe464b099217e3b9d97e8a75d7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "64e3ec7a71d3b715e2567f19f64207f04999bb0c"
            },
            {
              "version": "e0bbb53843b5fdfe464b099217e3b9d97e8a75d7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "863fa63fd1491f201ac819f805a8db98d2a32c3d"
            },
            {
              "version": "e0bbb53843b5fdfe464b099217e3b9d97e8a75d7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e71a3dc5b8d2ea4d9cfbdb135d6b7777de84212e"
            },
            {
              "version": "e0bbb53843b5fdfe464b099217e3b9d97e8a75d7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "31c81b376e5f058c7f2c94f69719cf7caec2fc3f"
            },
            {
              "version": "e0bbb53843b5fdfe464b099217e3b9d97e8a75d7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a776afa89424570bfa637ebf812ca281a5732904"
            },
            {
              "version": "e0bbb53843b5fdfe464b099217e3b9d97e8a75d7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "343aa5275484d627c921a42e8e115cae366be5de"
            },
            {
              "version": "e0bbb53843b5fdfe464b099217e3b9d97e8a75d7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "abb81e5ce7d995baa41556b8125fa59e28ba3be8"
            },
            {
              "version": "108681048cf728a8570e036c34ebd7daa43133b4",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "3a5837c692918c229baf63fe7950965d27c48ac2",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "5.4.47",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.5"
            },
            {
              "version": "5.6.19",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.7"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.7",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.7"
            },
            {
              "version": "5.10.270",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.221",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.188",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.157",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.110",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.52",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.2.6",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "version": "7.3",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}