CVE-2026-98248 (GCVE-0-2026-98248)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:45 – Updated: 2026-10-06 08:45
VLAI
Title
arm64: percpu: Fix LSE operations on {8,16}-bit types
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).
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 54/100 over 6618 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 959bf2fd03b59fc107584c21425f3dc73c49f762 , < d69ab4480e49bf925f4781afcc9f284affcb96b6 (git)
Affected: 959bf2fd03b59fc107584c21425f3dc73c49f762 , < 390742871a723b52de9b92a94c0d1c85a2531e3e (git)
Affected: 959bf2fd03b59fc107584c21425f3dc73c49f762 , < 843ace1d0a39e9b1cfcbfb3856a7b0fbdd9cd003 (git)
Affected: 959bf2fd03b59fc107584c21425f3dc73c49f762 , < 8cf2093f5372952a9ebc805c418d45df7112cd14 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.54 , ≤ 6.18.* (semver)
Unaffected: 7.2.8 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc4 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "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": [
            {
              "lessThan": "d69ab4480e49bf925f4781afcc9f284affcb96b6",
              "status": "affected",
              "version": "959bf2fd03b59fc107584c21425f3dc73c49f762",
              "versionType": "git"
            },
            {
              "lessThan": "390742871a723b52de9b92a94c0d1c85a2531e3e",
              "status": "affected",
              "version": "959bf2fd03b59fc107584c21425f3dc73c49f762",
              "versionType": "git"
            },
            {
              "lessThan": "843ace1d0a39e9b1cfcbfb3856a7b0fbdd9cd003",
              "status": "affected",
              "version": "959bf2fd03b59fc107584c21425f3dc73c49f762",
              "versionType": "git"
            },
            {
              "lessThan": "8cf2093f5372952a9ebc805c418d45df7112cd14",
              "status": "affected",
              "version": "959bf2fd03b59fc107584c21425f3dc73c49f762",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "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": [
            {
              "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"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc4",
              "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
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.8",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc4",
                  "versionStartIncluding": "5.0",
                  "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": "2026-10-06T08:45:16.693Z",
        "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": "2026-10-06T08:45:16.693Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-98248",
      "date": "2026-10-10",
      "epss": "0.002",
      "percentile": "0.09044"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "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": [
                  {
                    "lessThan": "d69ab4480e49bf925f4781afcc9f284affcb96b6",
                    "status": "affected",
                    "version": "959bf2fd03b59fc107584c21425f3dc73c49f762",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "390742871a723b52de9b92a94c0d1c85a2531e3e",
                    "status": "affected",
                    "version": "959bf2fd03b59fc107584c21425f3dc73c49f762",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "843ace1d0a39e9b1cfcbfb3856a7b0fbdd9cd003",
                    "status": "affected",
                    "version": "959bf2fd03b59fc107584c21425f3dc73c49f762",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "8cf2093f5372952a9ebc805c418d45df7112cd14",
                    "status": "affected",
                    "version": "959bf2fd03b59fc107584c21425f3dc73c49f762",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "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": [
                  {
                    "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"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.3-rc4",
                    "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\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)."
          }
        ],
        "id": "CVE-2026-98248",
        "lastModified": "2026-10-06T09:18:13.143",
        "metrics": {},
        "published": "2026-10-06T09:18:13.143",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/390742871a723b52de9b92a94c0d1c85a2531e3e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/843ace1d0a39e9b1cfcbfb3856a7b0fbdd9cd003"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8cf2093f5372952a9ebc805c418d45df7112cd14"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d69ab4480e49bf925f4781afcc9f284affcb96b6"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-10-07T23:45:37Z",
      "cve": "CVE-2026-98248",
      "id": "CVE-2026-98248",
      "initial_release_date": "2026-10-07T23:45:37Z",
      "product_status:known_affected": "146",
      "product_status:known_not_affected": "201",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98248",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-98248.json",
      "version": "2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.