{
  "cveId": "CVE-2024-46789",
  "url": "https://patchblox.com/security/cve/CVE-2024-46789",
  "summary": "CVE-2024-46789 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-46789, released September 18, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  mm/slub: add check for s-\u003Eflags in the alloc_tag...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mm/slub: add check for s-\u003Eflags in the alloc_tagging_slab_free_hook  When enable CONFIG_MEMCG \u0026 CONFIG_KFENCE \u0026 CONFIG_KMEMLEAK, the following warning always occurs,This is because the following call stack occurred: mem_pool_alloc     kmem_cache_alloc_noprof         slab_alloc_node             kfence_alloc  Once the kfence allocation is successful,slab-\u003Eobj_exts will not be empty, because it has already been assigned a value in kfence_init_pool.  Since in the prepare_slab_obj_exts_hook function,we perform a check for s-\u003Eflags \u0026 (SLAB_NO_OBJ_EXT | SLAB_NOLEAKTRACE),the alloc_tag_add function will not be called as a result.Therefore,ref-\u003Ect remains NULL.  However,when we call mem_pool_free,since obj_ext is not empty, it eventually leads to the alloc_tag_sub scenario being invoked.  This is where the warning occurs.  So we should add corresponding checks in the alloc_tagging_slab_free_hook. For __GFP_NO_OBJ_EXT case,I didn\u0027t see the specific case where it\u0027s using kfence,so I won\u0027t add the corresponding check in alloc_tagging_slab_free_hook for now.  [    3.734349] ------------[ cut here ]------------ [    3.734807] alloc_tag was not set [    3.735129] WARNING: CPU: 4 PID: 40 at ./include/linux/alloc_tag.h:130 kmem_cache_free\u002B0x444/0x574 [    3.735866] Modules linked in: autofs4 [    3.736211] CPU: 4 UID: 0 PID: 40 Comm: ksoftirqd/4 Tainted: G        W          6.11.0-rc3-dirty #1 [    3.736969] Tainted: [W]=WARN [    3.737258] Hardware name: QEMU KVM Virtual Machine, BIOS unknown 2/2/2022 [    3.737875] pstate: 60400005 (nZCv daif \u002BPAN -UAO -TCO -DIT -SSBS BTYPE=--) [    3.738501] pc : kmem_cache_free\u002B0x444/0x574 [    3.738951] lr : kmem_cache_free\u002B0x444/0x574 [    3.739361] sp : ffff80008357bb60 [    3.739693] x29: ffff80008357bb70 x28: 0000000000000000 x27: 0000000000000000 [    3.740338] x26: ffff80008207f000 x25: ffff000b2eb2fd60 x24: ffff0000c0005700 [    3.740982] x23: ffff8000804229e4 x22: ffff800082080000 x21: ffff800081756000 [    3.741630] x20: fffffd7ff8253360 x19: 00000000000000a8 x18: ffffffffffffffff [    3.742274] x17: ffff800ab327f000 x16: ffff800083398000 x15: ffff800081756df0 [    3.742919] x14: 0000000000000000 x13: 205d344320202020 x12: 5b5d373038343337 [    3.743560] x11: ffff80008357b650 x10: 000000000000005d x9 : 00000000ffffffd0 [    3.744231] x8 : 7f7f7f7f7f7f7f7f x7 : ffff80008237bad0 x6 : c0000000ffff7fff [    3.744907] x5 : ffff80008237ba78 x4 : ffff8000820bbad0 x3 : 0000000000000001 [    3.745580] x2 : 68d66547c09f7800 x1 : 68d66547c09f7800 x0 : 0000000000000000 [    3.746255] Call trace: [    3.746530]  kmem_cache_free\u002B0x444/0x574 [    3.746931]  mem_pool_free\u002B0x44/0xf4 [    3.747306]  free_object_rcu\u002B0xc8/0xdc [    3.747693]  rcu_do_batch\u002B0x234/0x8a4 [    3.748075]  rcu_core\u002B0x230/0x3e4 [    3.748424]  rcu_core_si\u002B0x14/0x1c [    3.748780]  handle_softirqs\u002B0x134/0x378 [    3.749189]  run_ksoftirqd\u002B0x70/0x9c [    3.749560]  smpboot_thread_fn\u002B0x148/0x22c [    3.749978]  kthread\u002B0x10c/0x118 [    3.750323]  ret_from_fork\u002B0x10/0x20 [    3.750696] ---[ end trace 0000000000000000 ]---",
  "published": "2024-09-18T08:15:05Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00177,
  "epssPercentile": 0.07298,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.10.11-1",
      "fix": "DEBIAN-CVE-2024-46789",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2024-46789",
      "released": "2024-09-18T08:15:05Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.10.11-1",
      "fix": "DEBIAN-CVE-2024-46789",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2024-46789",
      "released": "2024-09-18T08:15:05Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}