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io_uring/poll: fix signed comparison in io_poll_get_ownership()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: io_uring/poll: fix signed comparison in io_poll_get_ownership() io_poll_get_ownership() uses a signed comparison to check whether poll_refs has reached the threshold for the slowpath: if (unlikely(atomic_read(&req->poll_refs) >= IO_POLL_REF_BIAS)) atomic_read() returns int (signed). When IO_POLL_CANCEL_FLAG (BIT(31)) is set in poll_refs, the value becomes negative in signed arithmetic, so the >= 128 comparison always evaluates to false and the slowpath is never taken. Fix this by casting the atomic_read() result to unsigned int before the comparison, so that the cancel flag is treated as a large positive value and correctly triggers the slowpath.

Announced Source revision 1
Original source ↗

CVE-2026-52933

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-52933

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "a26a35e9019fd70bf3cf647dcfdae87abc7bacea",
        "lessThan": "81bf96b0abbfa4cd47ea32e12596aed3855fb2f3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a26a35e9019fd70bf3cf647dcfdae87abc7bacea",
        "lessThan": "cf522703d4f194991615763697ae25a3f9539763",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a26a35e9019fd70bf3cf647dcfdae87abc7bacea",
        "lessThan": "fc47043f3d9af3efa407665b47f8378ec691ba18",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a26a35e9019fd70bf3cf647dcfdae87abc7bacea",
        "lessThan": "ea0697129807d718037f618221037aa0660ee3c5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a26a35e9019fd70bf3cf647dcfdae87abc7bacea",
        "lessThan": "c6d191164dc81838d8dbf452a6000f68c558d1ae",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a26a35e9019fd70bf3cf647dcfdae87abc7bacea",
        "lessThan": "326941b22806cbf2df1fbfe902b7908b368cce42",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4b702b7d11ce1b9d26fc6d7c5a7ef4ac1d455048",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bc4e6ee16778149811333a969a7a893d4cc110c5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.15.82",
        "lessThan": "5.16",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.0.11",
        "lessThan": "6.1",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "io_uring/poll.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.1"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.1",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.1.175",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.140",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.86",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.27",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "io_uring/poll.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-52933

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40703 · Revision 1
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Publisher date
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