CVE-2026-98418 (GCVE-0-2026-98418)

Vulnerability from cvelistv5 – Published: 2026-10-14 13:27 – Updated: 2026-10-14 13:27
VLAI
Title
sched/core: Avoid false migration warning for proxy donors
Summary
In the Linux kernel, the following vulnerability has been resolved: sched/core: Avoid false migration warning for proxy donors Proxy execution can move a blocked donor's scheduling context to the lock owner's CPU even when the donor is migration-disabled. The donor does not execute there, and its original execution CPU remains recorded in wake_cpu. set_task_cpu() warns unconditionally for migration-disabled tasks, so a subsequent proxy migration or the wakeup path returning the donor home triggers a false positive: moving a blocked scheduling context does not violate the migration-disabled execution context. For example, creating a mutex owner on CPU1 and a migration-disabled waiter on CPU0 can trigger the following warning: proxy_migrate_repro: donor blocking on CPU0 with migration disabled proxy_migrate_repro: donor moved from CPU0 to CPU1 WARNING: kernel/sched/core.c:3389 at set_task_cpu+0x1d3/0x280 ... Call Trace: try_to_wake_up+0x43f/0x780 __mutex_unlock_slowpath+0x330/0x540 owner_fn+0x9f/0xc0 [proxy_migrate_repro] ... proxy_migrate_repro: donor woke on CPU0, task_cpu=0 proxy_migrate_repro: completed Exclude blocked proxy donors from the warning. The proxy wakeup path restores an executable placement before clearing the blocked state.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6666 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b049b81bdff6fc6794200a4c7d7d910e2008d57f , < e4a442da49fff7619b3cb2988e477022dcea6688 (git)
Affected: b049b81bdff6fc6794200a4c7d7d910e2008d57f , < fe3c73d7bc769e7afc252f867a3421fe168b898d (git)
guessed Create a notification for this product.
Linux Linux Affected: 7.1
Unaffected: 0 , < 7.1 (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": [
            "kernel/sched/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e4a442da49fff7619b3cb2988e477022dcea6688",
              "status": "affected",
              "version": "b049b81bdff6fc6794200a4c7d7d910e2008d57f",
              "versionType": "git"
            },
            {
              "lessThan": "fe3c73d7bc769e7afc252f867a3421fe168b898d",
              "status": "affected",
              "version": "b049b81bdff6fc6794200a4c7d7d910e2008d57f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/sched/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.1"
            },
            {
              "lessThan": "7.1",
              "status": "unaffected",
              "version": "0",
              "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": "7.2.8",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc4",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/core: Avoid false migration warning for proxy donors\n\nProxy execution can move a blocked donor\u0027s scheduling context to the\nlock owner\u0027s CPU even when the donor is migration-disabled. The donor\ndoes not execute there, and its original execution CPU remains recorded\nin wake_cpu.\n\nset_task_cpu() warns unconditionally for migration-disabled tasks, so a\nsubsequent proxy migration or the wakeup path returning the donor home\ntriggers a false positive: moving a blocked scheduling context does not\nviolate the migration-disabled execution context.\n\nFor example, creating a mutex owner on CPU1 and a migration-disabled\nwaiter on CPU0 can trigger the following warning:\n\n  proxy_migrate_repro: donor blocking on CPU0 with migration disabled\n  proxy_migrate_repro: donor moved from CPU0 to CPU1\n  WARNING: kernel/sched/core.c:3389 at set_task_cpu+0x1d3/0x280\n  ...\n  Call Trace:\n   try_to_wake_up+0x43f/0x780\n   __mutex_unlock_slowpath+0x330/0x540\n   owner_fn+0x9f/0xc0 [proxy_migrate_repro]\n  ...\n  proxy_migrate_repro: donor woke on CPU0, task_cpu=0\n  proxy_migrate_repro: completed\n\nExclude blocked proxy donors from the warning. The proxy wakeup path\nrestores an executable placement before clearing the blocked state."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-14T13:27:48.406Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e4a442da49fff7619b3cb2988e477022dcea6688"
        },
        {
          "url": "https://git.kernel.org/stable/c/fe3c73d7bc769e7afc252f867a3421fe168b898d"
        }
      ],
      "title": "sched/core: Avoid false migration warning for proxy donors",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98418",
    "datePublished": "2026-10-14T13:27:48.406Z",
    "dateReserved": "2026-09-25T10:25:14.347Z",
    "dateUpdated": "2026-10-14T13:27:48.406Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-98418",
      "date": "2026-10-16",
      "epss": "0.00216",
      "percentile": "0.11238"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "kernel/sched/core.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "e4a442da49fff7619b3cb2988e477022dcea6688",
                    "status": "affected",
                    "version": "b049b81bdff6fc6794200a4c7d7d910e2008d57f",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "fe3c73d7bc769e7afc252f867a3421fe168b898d",
                    "status": "affected",
                    "version": "b049b81bdff6fc6794200a4c7d7d910e2008d57f",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "kernel/sched/core.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "7.1"
                  },
                  {
                    "lessThan": "7.1",
                    "status": "unaffected",
                    "version": "0",
                    "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\nsched/core: Avoid false migration warning for proxy donors\n\nProxy execution can move a blocked donor\u0027s scheduling context to the\nlock owner\u0027s CPU even when the donor is migration-disabled. The donor\ndoes not execute there, and its original execution CPU remains recorded\nin wake_cpu.\n\nset_task_cpu() warns unconditionally for migration-disabled tasks, so a\nsubsequent proxy migration or the wakeup path returning the donor home\ntriggers a false positive: moving a blocked scheduling context does not\nviolate the migration-disabled execution context.\n\nFor example, creating a mutex owner on CPU1 and a migration-disabled\nwaiter on CPU0 can trigger the following warning:\n\n  proxy_migrate_repro: donor blocking on CPU0 with migration disabled\n  proxy_migrate_repro: donor moved from CPU0 to CPU1\n  WARNING: kernel/sched/core.c:3389 at set_task_cpu+0x1d3/0x280\n  ...\n  Call Trace:\n   try_to_wake_up+0x43f/0x780\n   __mutex_unlock_slowpath+0x330/0x540\n   owner_fn+0x9f/0xc0 [proxy_migrate_repro]\n  ...\n  proxy_migrate_repro: donor woke on CPU0, task_cpu=0\n  proxy_migrate_repro: completed\n\nExclude blocked proxy donors from the warning. The proxy wakeup path\nrestores an executable placement before clearing the blocked state."
          }
        ],
        "id": "CVE-2026-98418",
        "lastModified": "2026-10-14T14:17:53.173",
        "metrics": {},
        "published": "2026-10-14T14:17:53.173",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e4a442da49fff7619b3cb2988e477022dcea6688"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/fe3c73d7bc769e7afc252f867a3421fe168b898d"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-16T12:10:12+00:00",
      "cve": "CVE-2026-98418",
      "id": "CVE-2026-98418",
      "initial_release_date": "2026-10-14T00:00:00+00:00",
      "product_status:known_not_affected": "277",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sched/core: Avoid false migration warning for proxy donors",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98418.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    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.