CVE-2026-53321 (GCVE-0-2026-53321)
Vulnerability from cvelistv5
Published
2026-06-26 19:41
Modified
2026-06-26 19:41
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: io_uring/napi: cap busy_poll_to 10 msec Currently there's no cap on the maximum amount of time that napi is allowed to poll if no events are found, which can lead to kernel complaints on a task being stuck as there's no conditional rescheduling done within that loop. Just cap it to 10 msec in total, that's already way above any kind of sane value that will reap any benefits, yet low enough that it's nowhere near being able to trigger preemption complaints.
References
Impacted products
Vendor Product Version
Linux Linux Version: 8d0c12a80cdeb80d5e0510e96d38fe551ed8e9b5
Version: 8d0c12a80cdeb80d5e0510e96d38fe551ed8e9b5
Version: 8d0c12a80cdeb80d5e0510e96d38fe551ed8e9b5
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "io_uring/napi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "8d0c12a80cdeb80d5e0510e96d38fe551ed8e9b5",
              "versionType": "git"
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              "versionType": "git"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.9"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
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            },
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              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.33",
                  "versionStartIncluding": "6.9",
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                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/napi: cap busy_poll_to 10 msec\n\nCurrently there\u0027s no cap on the maximum amount of time that napi is\nallowed to poll if no events are found, which can lead to kernel\ncomplaints on a task being stuck as there\u0027s no conditional rescheduling\ndone within that loop.\n\nJust cap it to 10 msec in total, that\u0027s already way above any kind of\nsane value that will reap any benefits, yet low enough that it\u0027s\nnowhere near being able to trigger preemption complaints."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-26T19:41:12.589Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/39767f944a8c9e696566c37ad5b20131406c4b8d"
        },
        {
          "url": "https://git.kernel.org/stable/c/cb3af525f8dfb8930f0c123e5755fa967a12d5c1"
        },
        {
          "url": "https://git.kernel.org/stable/c/df8599ee18c0e5fe343ffe0b4c379636b8bb839a"
        }
      ],
      "title": "io_uring/napi: cap busy_poll_to 10 msec",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53321",
    "datePublished": "2026-06-26T19:41:12.589Z",
    "dateReserved": "2026-06-09T07:44:35.398Z",
    "dateUpdated": "2026-06-26T19:41:12.589Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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