CVE-2026-99267

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: io_uring/napi: make stale entries time out after 60s With dynamic tracking a NAPI id that hasn't been seen for a minute is meant to be dropped from the list the ring busy polls. The timeout is added to jiffies, but it is defined as 60 * SEC_CONVERSION, and SEC_CONVERSION isn't the number of jiffies in a second. It is the internal factor of __timespec64_to_jiffies(), HZ scaled up by SEC_JIFFIE_SC bits. For HZ=1000 that is 1000 << 22, which puts the timeout at about eight years. On 32-bit the multiplication overflows. So entries are never removed, and every id that a socket of the ring ever had keeps being polled on each wait.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-11-03 12:17:33.860000

Last modified

2026-11-03 12:17:33.860000

View original CVE JSON

{
  "id": "CVE-2026-99267",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-11-03T12:17:33.860",
  "lastModified": "2026-11-03T12:17:33.860",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/napi: make stale entries time out after 60s\n\nWith dynamic tracking a NAPI id that hasn't been seen for a minute is\nmeant to be dropped from the list the ring busy polls. The timeout is\nadded to jiffies, but it is defined as 60 * SEC_CONVERSION, and\nSEC_CONVERSION isn't the number of jiffies in a second. It is the\ninternal factor of __timespec64_to_jiffies(), HZ scaled up by\nSEC_JIFFIE_SC bits. For HZ=1000 that is 1000 << 22, which puts the\ntimeout at about eight years. On 32-bit the multiplication overflows.\n\nSo entries are never removed, and every id that a socket of the ring\never had keeps being polled on each wait."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "io_uring/napi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "8d0c12a80cdeb80d5e0510e96d38fe551ed8e9b5",
              "lessThan": "3fe820cf35f83534eab72ea73f1a83cfd3cd8079",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "8d0c12a80cdeb80d5e0510e96d38fe551ed8e9b5",
              "lessThan": "18c373f446068972788158c8c7de6e849b04ed98",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "8d0c12a80cdeb80d5e0510e96d38fe551ed8e9b5",
              "lessThan": "981621d6eadcd232d4ea748aaeb046337f10d3c1",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "io_uring/napi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.9",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.9",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.115",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.60",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.14",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/18c373f446068972788158c8c7de6e849b04ed98",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/3fe820cf35f83534eab72ea73f1a83cfd3cd8079",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/981621d6eadcd232d4ea748aaeb046337f10d3c1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}