CVE-2026-98248 (GCVE-0-2026-98248)
Vulnerability from cvelistv5
Published
2026-10-06 08:45
Modified
2026-10-19 09:16
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: arm64: percpu: Fix LSE operations on {8,16}-bit types The assembly for __percpu_##name##_case_##sz() and __percpu_##name##_return_case_##sz() doesn't use the 'sfx' macro argument to form the LSE instruction. Without 'sfx', a W register argument will imply a 32-bit memory location, and consequently {8,16}-bit ops will erroneously read and write 32 bits of memory when the LSE instruction is used. Fix this by appending 'sfx' to 'op_lse' to LSE instruction. It is not necessary (and not valid) to append 'sfx' to 'op_llsc', as 'op_llsc' is a register-register operation which does not access memory (and does not take a size suffix).
References
Impacted products
Vendor Product Version
Linux Linux Version: 959bf2fd03b59fc107584c21425f3dc73c49f762
Version: 959bf2fd03b59fc107584c21425f3dc73c49f762
Version: 959bf2fd03b59fc107584c21425f3dc73c49f762
Version: 959bf2fd03b59fc107584c21425f3dc73c49f762
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/include/asm/percpu.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.0"
            },
            {
              "lessThan": "5.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.112",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.54",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "7.2.8",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: percpu: Fix LSE operations on {8,16}-bit types\n\nThe assembly for __percpu_##name##_case_##sz() and\n__percpu_##name##_return_case_##sz() doesn\u0027t use the \u0027sfx\u0027 macro\nargument to form the LSE instruction. Without \u0027sfx\u0027, a W register\nargument will imply a 32-bit memory location, and consequently\n{8,16}-bit ops will erroneously read and write 32 bits of memory when\nthe LSE instruction is used.\n\nFix this by appending \u0027sfx\u0027 to \u0027op_lse\u0027 to LSE instruction. It is not\nnecessary (and not valid) to append \u0027sfx\u0027 to \u0027op_llsc\u0027, as \u0027op_llsc\u0027 is\na register-register operation which does not access memory (and does not\ntake a size suffix)."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:16:19.730Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d69ab4480e49bf925f4781afcc9f284affcb96b6"
        },
        {
          "url": "https://git.kernel.org/stable/c/390742871a723b52de9b92a94c0d1c85a2531e3e"
        },
        {
          "url": "https://git.kernel.org/stable/c/843ace1d0a39e9b1cfcbfb3856a7b0fbdd9cd003"
        },
        {
          "url": "https://git.kernel.org/stable/c/8cf2093f5372952a9ebc805c418d45df7112cd14"
        }
      ],
      "title": "arm64: percpu: Fix LSE operations on {8,16}-bit types",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98248",
    "datePublished": "2026-10-06T08:45:16.693Z",
    "dateReserved": "2026-09-25T10:25:14.330Z",
    "dateUpdated": "2026-10-19T09:16:19.730Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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