{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-99243",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-25T10:25:14.403Z",
        "datePublished": "2026-11-03T11:14:30.233Z",
        "dateUpdated": "2026-11-03T11:15:42.615Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-11-03T11:15:42.615Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio-wq: order the exit bit against worker creation task work\n\nio_wq_exit_workers() cancels task work for queued worker creation with\ntask_work_cancel_match(). That has a plain load of task->task_works.\n\nio_queue_worker_create() adds the new entry and tests IO_WQ_BIT_EXIT to\ncancel it if the workqueue is already on its way out.\n\nThat must be ordered. task_work_add() has a full barrier via cmpxchg().\nBut io_wq_exit_start() sets the bit with set_bit() which doesn't have\nany memory ordering.\n\nSo afaict, on weakly ordered architectures the exiting task may load\ntask_works before the store of the bit is visible. The other side tests\nthe bit before the store is visible as well. So the entry remains queued\nwith worker_refs and the exiting task waits on worker_done indefinitely.\n\nIf the task still has rings then io_uring_del_tctx_node() provides the\nbarrier via test_and_set_bit() in io_wq_set_exit_on_idle(). When it\nhas closed all rings though that barrier is gone.\n\nAdd the barrier after the set_bit()."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "io_uring/io-wq.c"
                    ],
                    "versions": [
                        {
                            "version": "4b4e5bbf9386d4ec21d91c0cb0fd60b9bba778ec",
                            "lessThan": "67da3eec264aeb67835886720243ae2dc1463315",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "71a85387546e50b1a37b0fa45dadcae3bfb35cf6",
                            "lessThan": "a63c752157eacf49f628359822666b32503d194a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "71a85387546e50b1a37b0fa45dadcae3bfb35cf6",
                            "lessThan": "1432d881d99584105122760133caeff1dce7a9f7",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "71a85387546e50b1a37b0fa45dadcae3bfb35cf6",
                            "lessThan": "6cf012a4d5e461c788ecc9dbed67adc31a142644",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "71a85387546e50b1a37b0fa45dadcae3bfb35cf6",
                            "lessThan": "0d81cdd433b0a96c5275c01b8172e0b1f71dd595",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "71a85387546e50b1a37b0fa45dadcae3bfb35cf6",
                            "lessThan": "75395db7a9b40a2e826c838e648fef8ed1a2d174",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "71a85387546e50b1a37b0fa45dadcae3bfb35cf6",
                            "lessThan": "31fc780b75b278d37700373d54a99fdb4117fdd6",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5.15.11",
                            "lessThan": "5.15.224",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "io_uring/io-wq.c"
                    ],
                    "versions": [
                        {
                            "version": "5.16",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.16",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.224",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.191",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.161",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.115",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.60",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.14",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3.1",
                            "lessThanOrEqual": "7.3.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.15.11",
                                    "versionEndExcluding": "5.15.224"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.16",
                                    "versionEndExcluding": "6.1.191"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.16",
                                    "versionEndExcluding": "6.6.161"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.16",
                                    "versionEndExcluding": "6.12.115"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.16",
                                    "versionEndExcluding": "6.18.60"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.16",
                                    "versionEndExcluding": "7.2.14"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.16",
                                    "versionEndExcluding": "7.3.1"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/67da3eec264aeb67835886720243ae2dc1463315"
                },
                {
                    "url": "https://git.kernel.org/stable/c/a63c752157eacf49f628359822666b32503d194a"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1432d881d99584105122760133caeff1dce7a9f7"
                },
                {
                    "url": "https://git.kernel.org/stable/c/6cf012a4d5e461c788ecc9dbed67adc31a142644"
                },
                {
                    "url": "https://git.kernel.org/stable/c/0d81cdd433b0a96c5275c01b8172e0b1f71dd595"
                },
                {
                    "url": "https://git.kernel.org/stable/c/75395db7a9b40a2e826c838e648fef8ed1a2d174"
                },
                {
                    "url": "https://git.kernel.org/stable/c/31fc780b75b278d37700373d54a99fdb4117fdd6"
                }
            ],
            "title": "io-wq: order the exit bit against worker creation task work",
            "x_generator": {
                "engine": "bippy-1.2.0"
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        }
    }
}