CVE-2026-52933 (GCVE-0-2026-52933)
Vulnerability from cvelistv5
Published
2026-06-24 07:14
Modified
2026-10-19 19:47
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: a26a35e9019fd70bf3cf647dcfdae87abc7bacea
Version: a26a35e9019fd70bf3cf647dcfdae87abc7bacea
Version: a26a35e9019fd70bf3cf647dcfdae87abc7bacea
Version: a26a35e9019fd70bf3cf647dcfdae87abc7bacea
Version: a26a35e9019fd70bf3cf647dcfdae87abc7bacea
Version: a26a35e9019fd70bf3cf647dcfdae87abc7bacea
Version: 4b702b7d11ce1b9d26fc6d7c5a7ef4ac1d455048
Version: bc4e6ee16778149811333a969a7a893d4cc110c5
Version: 5.15.82   ≤
Version: 6.0.11   ≤
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the race participants are attacker-controlled.\\nPR:L - With the default `io_uring_disabled=0`, an unprivileged local user can create and use io_uring; no real root or init-namespace capability is required.\\nUI:N - Exploitation does not require another user to mount, open, or process anything; the attacker drives the syscall and file-descriptor activity directly.\\nS:U - This is a kernel request-lifetime/ownership bug within the same host kernel security authority, not a VM, IOMMU, or separate security-scope escape.\\nC:H - The signedness bug defeats the poll_refs overflow/ownership slow path after cancellation, allowing ref-bit wrap and duplicate ownership/completion of an `io_kiocb`; that is UAF-style kernel memory corruption with plausible memory disclosure.\\nI:H - The same duplicate ownership/completion and request lifetime corruption can plausibly be shaped into arbitrary kernel memory modification or control-flow compromise, so integrity impact is high.\\nA:H - At minimum, corrupted poll ownership and duplicate completion can trigger kernel warnings, NULL dereferences, UAF crashes, or hangs in a local attacker-controlled loop.\"}]}], \"affected\": [{\"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\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/81bf96b0abbfa4cd47ea32e12596aed3855fb2f3\"}, {\"url\": \"https://git.kernel.org/stable/c/cf522703d4f194991615763697ae25a3f9539763\"}, {\"url\": \"https://git.kernel.org/stable/c/fc47043f3d9af3efa407665b47f8378ec691ba18\"}, {\"url\": \"https://git.kernel.org/stable/c/ea0697129807d718037f618221037aa0660ee3c5\"}, {\"url\": \"https://git.kernel.org/stable/c/c6d191164dc81838d8dbf452a6000f68c558d1ae\"}, {\"url\": \"https://git.kernel.org/stable/c/326941b22806cbf2df1fbfe902b7908b368cce42\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nio_uring/poll: fix signed comparison in io_poll_get_ownership()\\n\\nio_poll_get_ownership() uses a signed comparison to check whether\\npoll_refs has reached the threshold for the slowpath:\\n\\n    if (unlikely(atomic_read(\u0026req-\u003epoll_refs) \u003e= IO_POLL_REF_BIAS))\\n\\natomic_read() returns int (signed). When IO_POLL_CANCEL_FLAG\\n(BIT(31)) is set in poll_refs, the value becomes negative in\\nsigned arithmetic, so the \u003e= 128 comparison always evaluates to\\nfalse and the slowpath is never taken.\\n\\nFix this by casting the atomic_read() result to unsigned int\\nbefore the comparison, so that the cancel flag is treated as a\\nlarge positive value and correctly triggers the slowpath.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.175\", \"versionStartIncluding\": \"6.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.140\", \"versionStartIncluding\": \"6.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.86\", \"versionStartIncluding\": \"6.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.27\", \"versionStartIncluding\": \"6.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0.4\", \"versionStartIncluding\": \"6.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1\", \"versionStartIncluding\": \"6.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.15.82\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.0.11\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:31:51.192Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-52933\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T19:47:08.287Z\", \"dateReserved\": \"2026-06-09T07:44:35.369Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-06-24T07:14:24.678Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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