{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2024-46704",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nworkqueue: Fix spruious data race in __flush_work()\n\nWhen flushing a work item for cancellation, __flush_work() knows that it\nexclusively owns the work item through its PENDING bit. 134874e2eee9\n(\"workqueue: Allow cancel_work_sync() and disable_work() from atomic\ncontexts on BH work items\") added a read of @work->data to determine whether\nto use busy wait for BH work items that are being canceled. While the read\nis safe when @from_cancel, @work->data was read before testing @from_cancel\nto simplify code structure:\n\n\tdata = *work_data_bits(work);\n\tif (from_cancel &&\n\t    !WARN_ON_ONCE(data & WORK_STRUCT_PWQ) && (data & WORK_OFFQ_BH)) {\n\nWhile the read data was never used if !@from_cancel, this could trigger\nKCSAN data race detection spuriously:\n\n  ==================================================================\n  BUG: KCSAN: data-race in __flush_work / __flush_work\n\n  write to 0xffff8881223aa3e8 of 8 bytes by task 3998 on cpu 0:\n   instrument_write include/linux/instrumented.h:41 [inline]\n   ___set_bit include/asm-generic/bitops/instrumented-non-atomic.h:28 [inline]\n   insert_wq_barrier kernel/workqueue.c:3790 [inline]\n   start_flush_work kernel/workqueue.c:4142 [inline]\n   __flush_work+0x30b/0x570 kernel/workqueue.c:4178\n   flush_work kernel/workqueue.c:4229 [inline]\n   ...\n\n  read to 0xffff8881223aa3e8 of 8 bytes by task 50 on cpu 1:\n   __flush_work+0x42a/0x570 kernel/workqueue.c:4188\n   flush_work kernel/workqueue.c:4229 [inline]\n   flush_delayed_work+0x66/0x70 kernel/workqueue.c:4251\n   ...\n\n  value changed: 0x0000000000400000 -> 0xffff88810006c00d\n\nReorganize the code so that @from_cancel is tested before @work->data is\naccessed. The only problem is triggering KCSAN detection spuriously. This\nshouldn't need READ_ONCE() or other access qualifiers.\n\nNo functional changes."
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "n/a"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Linux",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Linux",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "134874e2eee9",
                                            "version_value": "91d09642127a"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "6.10",
                                                        "status": "affected"
                                                    },
                                                    {
                                                        "version": "0",
                                                        "lessThan": "6.10",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.10.7",
                                                        "lessThanOrEqual": "6.10.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.11",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
                                                    }
                                                ],
                                                "defaultStatus": "affected"
                                            }
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://git.kernel.org/stable/c/91d09642127a32fde231face2ff489af70eef316",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/91d09642127a32fde231face2ff489af70eef316"
            },
            {
                "url": "https://git.kernel.org/stable/c/8bc35475ef1a23b0e224f3242eb11c76cab0ea88",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/8bc35475ef1a23b0e224f3242eb11c76cab0ea88"
            }
        ]
    },
    "generator": {
        "engine": "bippy-c9c4e1df01b2"
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}