{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2024-46789",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/slub: add check for s->flags in the alloc_tagging_slab_free_hook\n\nWhen enable CONFIG_MEMCG & CONFIG_KFENCE & CONFIG_KMEMLEAK, the following\nwarning always occurs,This is because the following call stack occurred:\nmem_pool_alloc\n    kmem_cache_alloc_noprof\n        slab_alloc_node\n            kfence_alloc\n\nOnce the kfence allocation is successful,slab->obj_exts will not be empty,\nbecause it has already been assigned a value in kfence_init_pool.\n\nSince in the prepare_slab_obj_exts_hook function,we perform a check for\ns->flags & (SLAB_NO_OBJ_EXT | SLAB_NOLEAKTRACE),the alloc_tag_add function\nwill not be called as a result.Therefore,ref->ct remains NULL.\n\nHowever,when we call mem_pool_free,since obj_ext is not empty, it\neventually leads to the alloc_tag_sub scenario being invoked.  This is\nwhere the warning occurs.\n\nSo we should add corresponding checks in the alloc_tagging_slab_free_hook.\nFor __GFP_NO_OBJ_EXT case,I didn't see the specific case where it's using\nkfence,so I won't add the corresponding check in\nalloc_tagging_slab_free_hook for now.\n\n[    3.734349] ------------[ cut here ]------------\n[    3.734807] alloc_tag was not set\n[    3.735129] WARNING: CPU: 4 PID: 40 at ./include/linux/alloc_tag.h:130 kmem_cache_free+0x444/0x574\n[    3.735866] Modules linked in: autofs4\n[    3.736211] CPU: 4 UID: 0 PID: 40 Comm: ksoftirqd/4 Tainted: G        W          6.11.0-rc3-dirty #1\n[    3.736969] Tainted: [W]=WARN\n[    3.737258] Hardware name: QEMU KVM Virtual Machine, BIOS unknown 2/2/2022\n[    3.737875] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[    3.738501] pc : kmem_cache_free+0x444/0x574\n[    3.738951] lr : kmem_cache_free+0x444/0x574\n[    3.739361] sp : ffff80008357bb60\n[    3.739693] x29: ffff80008357bb70 x28: 0000000000000000 x27: 0000000000000000\n[    3.740338] x26: ffff80008207f000 x25: ffff000b2eb2fd60 x24: ffff0000c0005700\n[    3.740982] x23: ffff8000804229e4 x22: ffff800082080000 x21: ffff800081756000\n[    3.741630] x20: fffffd7ff8253360 x19: 00000000000000a8 x18: ffffffffffffffff\n[    3.742274] x17: ffff800ab327f000 x16: ffff800083398000 x15: ffff800081756df0\n[    3.742919] x14: 0000000000000000 x13: 205d344320202020 x12: 5b5d373038343337\n[    3.743560] x11: ffff80008357b650 x10: 000000000000005d x9 : 00000000ffffffd0\n[    3.744231] x8 : 7f7f7f7f7f7f7f7f x7 : ffff80008237bad0 x6 : c0000000ffff7fff\n[    3.744907] x5 : ffff80008237ba78 x4 : ffff8000820bbad0 x3 : 0000000000000001\n[    3.745580] x2 : 68d66547c09f7800 x1 : 68d66547c09f7800 x0 : 0000000000000000\n[    3.746255] Call trace:\n[    3.746530]  kmem_cache_free+0x444/0x574\n[    3.746931]  mem_pool_free+0x44/0xf4\n[    3.747306]  free_object_rcu+0xc8/0xdc\n[    3.747693]  rcu_do_batch+0x234/0x8a4\n[    3.748075]  rcu_core+0x230/0x3e4\n[    3.748424]  rcu_core_si+0x14/0x1c\n[    3.748780]  handle_softirqs+0x134/0x378\n[    3.749189]  run_ksoftirqd+0x70/0x9c\n[    3.749560]  smpboot_thread_fn+0x148/0x22c\n[    3.749978]  kthread+0x10c/0x118\n[    3.750323]  ret_from_fork+0x10/0x20\n[    3.750696] ---[ end trace 0000000000000000 ]---"
            }
        ]
    },
    "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": "4b8736964640",
                                            "version_value": "2d476c86ba47"
                                        },
                                        {
                                            "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": "6.10.10",
                                                        "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/2d476c86ba4745fcbc912ce4627df4fa80caa9ad",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/2d476c86ba4745fcbc912ce4627df4fa80caa9ad"
            },
            {
                "url": "https://git.kernel.org/stable/c/ab7ca09520e9c41c219a4427fe0dae24024bfe7f",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/ab7ca09520e9c41c219a4427fe0dae24024bfe7f"
            }
        ]
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    "generator": {
        "engine": "bippy-c9c4e1df01b2"
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}