{"id":"CVE-2026-52933","revision":"29f76a2b112b496b9a710b4358b23aca","records":[{"revision":"29f76a2b112b496b9a710b4358b23aca","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-52933","aliases":[],"title":"io_uring/poll: fix signed comparison in io_poll_get_ownership()","description":"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(&req->poll_refs) >= 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 >= 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.","state":0,"publishedAt":"2026-06-24T07:14:24.678+00:00","modifiedAt":"2026-10-19T19:47:08.287+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"io_uring/poll.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"a26a35e9019fd70bf3cf647dcfdae87abc7bacea\",\n                            \"lessThan\": \"81bf96b0abbfa4cd47ea32e12596aed3855fb2f3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a26a35e9019fd70bf3cf647dcfdae87abc7bacea\",\n                            \"lessThan\": \"cf522703d4f194991615763697ae25a3f9539763\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a26a35e9019fd70bf3cf647dcfdae87abc7bacea\",\n                            \"lessThan\": \"fc47043f3d9af3efa407665b47f8378ec691ba18\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a26a35e9019fd70bf3cf647dcfdae87abc7bacea\",\n                            \"lessThan\": \"ea0697129807d718037f618221037aa0660ee3c5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a26a35e9019fd70bf3cf647dcfdae87abc7bacea\",\n                            \"lessThan\": \"c6d191164dc81838d8dbf452a6000f68c558d1ae\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a26a35e9019fd70bf3cf647dcfdae87abc7bacea\",\n                            \"lessThan\": \"326941b22806cbf2df1fbfe902b7908b368cce42\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4b702b7d11ce1b9d26fc6d7c5a7ef4ac1d455048\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"bc4e6ee16778149811333a969a7a893d4cc110c5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5.15.82\",\n                            \"lessThan\": \"5.16\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.0.11\",\n                            \"lessThan\": \"6.1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"io_uring/poll.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.1\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.1\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.175\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.140\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.86\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.27\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.4\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/81bf96b0abbfa4cd47ea32e12596aed3855fb2f3","https://git.kernel.org/stable/c/cf522703d4f194991615763697ae25a3f9539763","https://git.kernel.org/stable/c/fc47043f3d9af3efa407665b47f8378ec691ba18","https://git.kernel.org/stable/c/ea0697129807d718037f618221037aa0660ee3c5","https://git.kernel.org/stable/c/c6d191164dc81838d8dbf452a6000f68c558d1ae","https://git.kernel.org/stable/c/326941b22806cbf2df1fbfe902b7908b368cce42"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-52933","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-52933","identifiers":["CVE-2026-52933"]},"retained":false,"historicalAffected":[]}],"coverage":[]}