CVE-2026-93220

Description

In the Linux kernel, the following vulnerability has been resolved: sched_ext: Keep kick_sync waiting on the rq's own CPU kick_sync_wait_bal_cb() assumes it runs on the rq's CPU from the __schedule() tail: the snapshots it compares against live in that CPU's percpu area and the busy-wait runs with the rq lock dropped and IRQs enabled. However, dispatch can now drop the rq lock while the callback sits queued, and rq lock takers in that window (the sched class change paths, the scx task iterator) flush pending balance callbacks on release, running the callback on a foreign CPU. Such a run compares against unrelated snapshots and can deadlock when the executing CPU is itself a wait target. Bail on a foreign CPU and leave the wait state alone. The wait only observes progress that the resched kicks already guarantee and the rq's next wait picks up the stale cpus_to_sync bits.

Overview

State: PUBLISHED
Assigner (CNA): Linux
CVSS severity: —
CVSS score: —
CVSS vector: —
Effective score: no score available from CNA, NVD, or AI yet
CWE(s): —
Reserved: 2026-09-17
Published: 2026-09-24 15:10 UTC
Last updated: 2026-09-24 15:10 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/93xxx/CVE-2026-93220.json

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NVD published: 2026-09-24 16:17:17 UTC
NVD last modified: 2026-09-24 16:17:17 UTC

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European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-85949
Assigner: Linux
Published: Sep 24, 2026, 3:10:43 PM
Updated: Sep 24, 2026, 3:10:43 PM
EUVD base score: 0.0 / 10
EUVD-reported EPSS: 0.0000
Vendors: Linux
Products: Linux (6.19)

Linux (4c95380701f58b8112f0b891de8d160e4199e19d <c736ea0fe7b4df920da6bd43a81c5eeecadcc8be)

Linux (4c95380701f58b8112f0b891de8d160e4199e19d <e0253dd04beb03e79477c5ef4768b11135687206)

Linux (patch: 0)

Linux (patch: 7.3-rc1)

Linux (patch: 7.2.4)
Aliases: GHSA-mp4r-853f-vhwr

ENISA description: In the Linux kernel, the following vulnerability has been resolved: sched_ext: Keep kick_sync waiting on the rq's own CPU kick_sync_wait_bal_cb() assumes it runs on the rq's CPU from the __schedule() tail: the snapshots it compares against live in that CPU's percpu area and the busy-wait runs with the rq lock dropped and IRQs enabled. However, dispatch can now drop the rq lock while the callback sits queued, and rq lock takers in that window (the sched class change paths, the scx task iterator) flush pending balance callbacks on release, running the callback on a foreign CPU. Such a run compares against unrelated snapshots and can deadlock when the executing CPU is itself a wait target. Bail on a foreign CPU and leave the wait state alone. The wait only observes progress that the resched kicks already guarantee and the rq's next wait picks up the stale cpus_to_sync bits.

EUVD references (2)

Affected products (2)

Vendor	Product	Versions	Platforms
Linux	Linux	`4c95380701f58b8112f0b891de8d160e4199e19d` (affected), `4c95380701f58b8112f0b891de8d160e4199e19d` (affected)	—
Linux	Linux	`6.19` (affected), `0` (unaffected), `7.2.4` (unaffected), `7.3-rc1` (unaffected)	—

Vendor references (2)

References embedded in the original CVE record by the assigning CNA.

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (2)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://git.kernel.org/stable/c/c736ea0fe7b4df920da6bd43a81c5eeecadcc8be 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/e0253dd04beb03e79477c5ef4768b11135687206 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Remediations (10)

Oracle Critical Patch Update Advisory - April 2026

web:blogs.oracle.com

This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

2026-09-25 10:45 UTC
CVE-2026-93220: Linux Vulnerability - CVETodo

web:cvetodo.com

CVE-2026-93220 vulnerability details and analysis. Full technical analysis, mitigations , and exploit status — updated in real time.

2026-09-25 10:45 UTC
Security Update Guide - Microsoft

web:msrc.microsoft.com

The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.

2026-09-25 10:45 UTC
Out-of-band Security Notification (September 2, 2026)

web:my.f5.com

On September 2, 2026 , F5 announced the following security issues. This document is intended to serve as an index of these vulnerabilities and security exposures to help determine the impact to your F5 devices. You can find the details of each issue in the associated articles.

2026-09-25 10:45 UTC
2026 Catalog Release History - Patch My PC

web:patchmypc.com

You can find the production release history below for 2026 .

2026-09-25 10:45 UTC
Cisco Advance Notification for Publication of September 16, 2026 ...

web:sec.cloudapps.cisco.com

On September 16, 2026 , the Cisco Product Security Incident Response Team (PSIRT) published the advisories that are listed in the following tables. To remediate these vulnerabilities, Cisco strongly recommends that customers upgrade to the fixed software that is indicated in the advisories. For more information about changes in Cisco PSIRT vulnerability disclosure, see Strengthening the ...

2026-09-25 10:45 UTC
What Is CVE Remediation in 2026? - aikido.dev

web:www.aikido.dev

CVE remediation is fixing known flaws in the software you run. Why upgrading often fails, what remediation actually involves, and how backporting fixes it.

2026-09-25 10:45 UTC
Security Bulletin: IBM MQ is affected by multiple vulnerabilities in ...

web:www.ibm.com

Multiple issues were identified with IBM WebSphere Application Server Liberty, which IBM MQ ships and uses to supply IBM MQ Console and IBM MQ REST API functionality.

2026-09-25 10:45 UTC
Oracle Critical Patch Update Advisory - April 2026

web:www.oracle.com

This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

2026-09-25 10:45 UTC
Oracle Critical Security Patch Update Advisory - June 2026

web:www.oracle.com

Additional CVEs addressed are: The patch for CVE - 2026 -34481 also addresses CVE - 2026 -34477, CVE - 2026 -34478, CVE - 2026 -34479, and CVE - 2026 -34480. Oracle Fusion Middleware Risk Matrix This Critical Security Patch Update contains 106 new security patches for Oracle Fusion Middleware. 53 of these vulnerabilities may be remotely exploitable without authentication, i.e., may be exploited over a ...

2026-09-25 10:45 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-93220.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/sched/ext/ext.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c736ea0fe7b4df920da6bd43a81c5eeecadcc8be",
              "status": "affected",
              "version": "4c95380701f58b8112f0b891de8d160e4199e19d",
              "versionType": "git"
            },
            {
              "lessThan": "e0253dd04beb03e79477c5ef4768b11135687206",
              "status": "affected",
              "version": "4c95380701f58b8112f0b891de8d160e4199e19d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/sched/ext/ext.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.19"
            },
            {
              "lessThan": "6.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "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": "7.2.4",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Keep kick_sync waiting on the rq's own CPU\n\nkick_sync_wait_bal_cb() assumes it runs on the rq's CPU from the\n__schedule() tail: the snapshots it compares against live in that CPU's\npercpu area and the busy-wait runs with the rq lock dropped and IRQs\nenabled.\n\nHowever, dispatch can now drop the rq lock while the callback sits queued,\nand rq lock takers in that window (the sched class change paths, the scx\ntask iterator) flush pending balance callbacks on release, running the\ncallback on a foreign CPU. Such a run compares against unrelated snapshots\nand can deadlock when the executing CPU is itself a wait target.\n\nBail on a foreign CPU and leave the wait state alone. The wait only observes\nprogress that the resched kicks already guarantee and the rq's next wait\npicks up the stale cpus_to_sync bits."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-24T15:10:43.770Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c736ea0fe7b4df920da6bd43a81c5eeecadcc8be"
        },
        {
          "url": "https://git.kernel.org/stable/c/e0253dd04beb03e79477c5ef4768b11135687206"
        }
      ],
      "title": "sched_ext: Keep kick_sync waiting on the rq's own CPU",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93220",
    "datePublished": "2026-09-24T15:10:43.770Z",
    "dateReserved": "2026-09-17T16:02:15.094Z",
    "dateUpdated": "2026-09-24T15:10:43.770Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}