Vulnerability-Lookup

CVE-2026-93167 (GCVE-0-2026-93167)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:11 – Updated: 2026-09-17 16:11

Title

csky: Fix a4/a5 restoration in syscall trace path

Summary

In the Linux kernel, the following vulnerability has been resolved: csky: Fix a4/a5 restoration in syscall trace path The syscall trace path reloads syscall arguments from pt_regs before calling the syscall handler. On C-SKY ABIv2, the 5th and 6th syscall arguments are prepared as stack arguments before invoking syscallid. The current code adjusts sp before loading LSAVE_A4 and LSAVE_A5. Since those offsets are relative to the original pt_regs base, loading them after changing sp fetches the wrong slots. As a result, traced syscalls that use the 5th or 6th argument may receive corrupted arguments. This is visible with mmap2(), which takes six arguments. A small PTRACE_SYSCALL reproducer opens a file and maps one page with: mmap(NULL, 4096, PROT_READ | PROT_EXEC, MAP_PRIVATE, fd, 0) Before the fix, the traced child fails the mmap and exits with 12. After the fix, the mapping succeeds and the child exits with 0. Fix the trace path by loading a4/a5 from pt_regs before changing sp. Tested on: ck860f, linux-4.19.15, C-SKY abiv2

Severity

No CVSS data available.

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/e9ae8e86eed68bea5…
https://git.kernel.org/stable/c/64e3ec7a71d3b715e…
https://git.kernel.org/stable/c/863fa63fd1491f201…
https://git.kernel.org/stable/c/e71a3dc5b8d2ea4d9…
https://git.kernel.org/stable/c/31c81b376e5f058c7…
https://git.kernel.org/stable/c/a776afa89424570bf…
https://git.kernel.org/stable/c/343aa5275484d627c…
https://git.kernel.org/stable/c/abb81e5ce7d995baa…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: e0bbb53843b5fdfe464b099217e3b9d97e8a75d7 , < e9ae8e86eed68bea5d2670eadf61938a43bd2263 (git) Affected: e0bbb53843b5fdfe464b099217e3b9d97e8a75d7 , < 64e3ec7a71d3b715e2567f19f64207f04999bb0c (git) Affected: e0bbb53843b5fdfe464b099217e3b9d97e8a75d7 , < 863fa63fd1491f201ac819f805a8db98d2a32c3d (git) Affected: e0bbb53843b5fdfe464b099217e3b9d97e8a75d7 , < e71a3dc5b8d2ea4d9cfbdb135d6b7777de84212e (git) Affected: e0bbb53843b5fdfe464b099217e3b9d97e8a75d7 , < 31c81b376e5f058c7f2c94f69719cf7caec2fc3f (git) Affected: e0bbb53843b5fdfe464b099217e3b9d97e8a75d7 , < a776afa89424570bfa637ebf812ca281a5732904 (git) Affected: e0bbb53843b5fdfe464b099217e3b9d97e8a75d7 , < 343aa5275484d627c921a42e8e115cae366be5de (git) Affected: e0bbb53843b5fdfe464b099217e3b9d97e8a75d7 , < abb81e5ce7d995baa41556b8125fa59e28ba3be8 (git) Affected: 108681048cf728a8570e036c34ebd7daa43133b4 (git) Affected: 3a5837c692918c229baf63fe7950965d27c48ac2 (git) Affected: 5.4.47 , < 5.5 (semver) Affected: 5.6.19 , < 5.7 (semver)	guessed
Linux	Linux	Affected: 5.7 Unaffected: 0 , < 5.7 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.52 , ≤ 6.18.* (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/csky/kernel/entry.S"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e9ae8e86eed68bea5d2670eadf61938a43bd2263",
              "status": "affected",
              "version": "e0bbb53843b5fdfe464b099217e3b9d97e8a75d7",
              "versionType": "git"
            },
            {
              "lessThan": "64e3ec7a71d3b715e2567f19f64207f04999bb0c",
              "status": "affected",
              "version": "e0bbb53843b5fdfe464b099217e3b9d97e8a75d7",
              "versionType": "git"
            },
            {
              "lessThan": "863fa63fd1491f201ac819f805a8db98d2a32c3d",
              "status": "affected",
              "version": "e0bbb53843b5fdfe464b099217e3b9d97e8a75d7",
              "versionType": "git"
            },
            {
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              "version": "e0bbb53843b5fdfe464b099217e3b9d97e8a75d7",
              "versionType": "git"
            },
            {
              "lessThan": "31c81b376e5f058c7f2c94f69719cf7caec2fc3f",
              "status": "affected",
              "version": "e0bbb53843b5fdfe464b099217e3b9d97e8a75d7",
              "versionType": "git"
            },
            {
              "lessThan": "a776afa89424570bfa637ebf812ca281a5732904",
              "status": "affected",
              "version": "e0bbb53843b5fdfe464b099217e3b9d97e8a75d7",
              "versionType": "git"
            },
            {
              "lessThan": "343aa5275484d627c921a42e8e115cae366be5de",
              "status": "affected",
              "version": "e0bbb53843b5fdfe464b099217e3b9d97e8a75d7",
              "versionType": "git"
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              "status": "affected",
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              "versionType": "git"
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              "status": "affected",
              "version": "108681048cf728a8570e036c34ebd7daa43133b4",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3a5837c692918c229baf63fe7950965d27c48ac2",
              "versionType": "git"
            },
            {
              "lessThan": "5.5",
              "status": "affected",
              "version": "5.4.47",
              "versionType": "semver"
            },
            {
              "lessThan": "5.7",
              "status": "affected",
              "version": "5.6.19",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/csky/kernel/entry.S"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.7"
            },
            {
              "lessThan": "5.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.4.47",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.6.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-17T16:11:59.234Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e9ae8e86eed68bea5d2670eadf61938a43bd2263"
        },
        {
          "url": "https://git.kernel.org/stable/c/64e3ec7a71d3b715e2567f19f64207f04999bb0c"
        },
        {
          "url": "https://git.kernel.org/stable/c/863fa63fd1491f201ac819f805a8db98d2a32c3d"
        },
        {
          "url": "https://git.kernel.org/stable/c/e71a3dc5b8d2ea4d9cfbdb135d6b7777de84212e"
        },
        {
          "url": "https://git.kernel.org/stable/c/31c81b376e5f058c7f2c94f69719cf7caec2fc3f"
        },
        {
          "url": "https://git.kernel.org/stable/c/a776afa89424570bfa637ebf812ca281a5732904"
        },
        {
          "url": "https://git.kernel.org/stable/c/343aa5275484d627c921a42e8e115cae366be5de"
        },
        {
          "url": "https://git.kernel.org/stable/c/abb81e5ce7d995baa41556b8125fa59e28ba3be8"
        }
      ],
      "title": "csky: Fix a4/a5 restoration in syscall trace path",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93167",
    "datePublished": "2026-09-17T16:11:59.234Z",
    "dateReserved": "2026-09-17T16:02:15.090Z",
    "dateUpdated": "2026-09-17T16:11:59.234Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-93167\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-17T17:18:12.243\",\"lastModified\":\"2026-09-17T17:18:12.243\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"arch/csky/kernel/entry.S\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e0bbb53843b5fdfe464b099217e3b9d97e8a75d7\",\"lessThan\":\"e9ae8e86eed68bea5d2670eadf61938a43bd2263\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e0bbb53843b5fdfe464b099217e3b9d97e8a75d7\",\"lessThan\":\"64e3ec7a71d3b715e2567f19f64207f04999bb0c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e0bbb53843b5fdfe464b099217e3b9d97e8a75d7\",\"lessThan\":\"863fa63fd1491f201ac819f805a8db98d2a32c3d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e0bbb53843b5fdfe464b099217e3b9d97e8a75d7\",\"lessThan\":\"e71a3dc5b8d2ea4d9cfbdb135d6b7777de84212e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e0bbb53843b5fdfe464b099217e3b9d97e8a75d7\",\"lessThan\":\"31c81b376e5f058c7f2c94f69719cf7caec2fc3f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e0bbb53843b5fdfe464b099217e3b9d97e8a75d7\",\"lessThan\":\"a776afa89424570bfa637ebf812ca281a5732904\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e0bbb53843b5fdfe464b099217e3b9d97e8a75d7\",\"lessThan\":\"343aa5275484d627c921a42e8e115cae366be5de\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e0bbb53843b5fdfe464b099217e3b9d97e8a75d7\",\"lessThan\":\"abb81e5ce7d995baa41556b8125fa59e28ba3be8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"108681048cf728a8570e036c34ebd7daa43133b4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3a5837c692918c229baf63fe7950965d27c48ac2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.4.47\",\"lessThan\":\"5.5\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.6.19\",\"lessThan\":\"5.7\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"arch/csky/kernel/entry.S\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.7\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.7\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.270\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.110\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.52\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.6\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/31c81b376e5f058c7f2c94f69719cf7caec2fc3f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/343aa5275484d627c921a42e8e115cae366be5de\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/64e3ec7a71d3b715e2567f19f64207f04999bb0c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/863fa63fd1491f201ac819f805a8db98d2a32c3d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a776afa89424570bfa637ebf812ca281a5732904\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/abb81e5ce7d995baa41556b8125fa59e28ba3be8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e71a3dc5b8d2ea4d9cfbdb135d6b7777de84212e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e9ae8e86eed68bea5d2670eadf61938a43bd2263\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}

FKIE_CVE-2026-93167

Vulnerability from fkie_nvd - Published: 2026-09-17 17:18 - Updated: 2026-09-17 17:18

Severity

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/31c81b376e5f058c7f2c94f69719cf7caec2fc3f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/343aa5275484d627c921a42e8e115cae366be5de
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/64e3ec7a71d3b715e2567f19f64207f04999bb0c
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/863fa63fd1491f201ac819f805a8db98d2a32c3d
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a776afa89424570bfa637ebf812ca281a5732904
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/abb81e5ce7d995baa41556b8125fa59e28ba3be8
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e71a3dc5b8d2ea4d9cfbdb135d6b7777de84212e
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e9ae8e86eed68bea5d2670eadf61938a43bd2263

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/csky/kernel/entry.S"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e9ae8e86eed68bea5d2670eadf61938a43bd2263",
              "status": "affected",
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          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/csky/kernel/entry.S"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "5.7"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.18.52",
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              "versionType": "semver"
            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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"
    }
  ],
  "id": "CVE-2026-93167",
  "lastModified": "2026-09-17T17:18:12.243",
  "metrics": {},
  "published": "2026-09-17T17:18:12.243",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/31c81b376e5f058c7f2c94f69719cf7caec2fc3f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/343aa5275484d627c921a42e8e115cae366be5de"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/64e3ec7a71d3b715e2567f19f64207f04999bb0c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/863fa63fd1491f201ac819f805a8db98d2a32c3d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a776afa89424570bfa637ebf812ca281a5732904"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/abb81e5ce7d995baa41556b8125fa59e28ba3be8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e71a3dc5b8d2ea4d9cfbdb135d6b7777de84212e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e9ae8e86eed68bea5d2670eadf61938a43bd2263"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-FGG4-F5V2-253F

Vulnerability from github – Published: 2026-09-17 18:32 – Updated: 2026-09-17 18:32

Details

In the Linux kernel, the following vulnerability has been resolved:

csky: Fix a4/a5 restoration in syscall trace path

The syscall trace path reloads syscall arguments from pt_regs before calling the syscall handler. On C-SKY ABIv2, the 5th and 6th syscall arguments are prepared as stack arguments before invoking syscallid.

The current code adjusts sp before loading LSAVE_A4 and LSAVE_A5. Since those offsets are relative to the original pt_regs base, loading them after changing sp fetches the wrong slots. As a result, traced syscalls that use the 5th or 6th argument may receive corrupted arguments.

This is visible with mmap2(), which takes six arguments. A small PTRACE_SYSCALL reproducer opens a file and maps one page with:

mmap(NULL, 4096, PROT_READ | PROT_EXEC, MAP_PRIVATE, fd, 0)

Before the fix, the traced child fails the mmap and exits with 12. After the fix, the mapping succeeds and the child exits with 0.

Fix the trace path by loading a4/a5 from pt_regs before changing sp.

Tested on: ck860f, linux-4.19.15, C-SKY abiv2

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-93167"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-17T17:18:12Z",
    "severity": null
  },
  "details": "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",
  "id": "GHSA-fgg4-f5v2-253f",
  "modified": "2026-09-17T18:32:13Z",
  "published": "2026-09-17T18:32:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93167"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/31c81b376e5f058c7f2c94f69719cf7caec2fc3f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/343aa5275484d627c921a42e8e115cae366be5de"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/64e3ec7a71d3b715e2567f19f64207f04999bb0c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/863fa63fd1491f201ac819f805a8db98d2a32c3d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a776afa89424570bfa637ebf812ca281a5732904"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/abb81e5ce7d995baa41556b8125fa59e28ba3be8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e71a3dc5b8d2ea4d9cfbdb135d6b7777de84212e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e9ae8e86eed68bea5d2670eadf61938a43bd2263"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

CVE-2026-93167 (GCVE-0-2026-93167)

FKIE_CVE-2026-93167

GHSA-FGG4-F5V2-253F

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