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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vmwgfx: Create debugfs ttm_resource_manager entry only if needed\n\nThe driver creates /sys/kernel/debug/dri/0/mob_ttm even when the\ncorresponding ttm_resource_manager is not allocated.\nThis leads to a crash when trying to read from this file.\n\nAdd a check to create mob_ttm, system_mob_ttm, and gmr_ttm debug file\nonly when the corresponding ttm_resource_manager is allocated.\n\ncrash\u003e bt\nPID: 3133409  TASK: ffff8fe4834a5000  CPU: 3    COMMAND: \"grep\"\n #0 [ffffb954506b3b20] machine_kexec at ffffffffb2a6bec3\n #1 [ffffb954506b3b78] __crash_kexec at ffffffffb2bb598a\n #2 [ffffb954506b3c38] crash_kexec at ffffffffb2bb68c1\n #3 [ffffb954506b3c50] oops_end at ffffffffb2a2a9b1\n #4 [ffffb954506b3c70] no_context at ffffffffb2a7e913\n #5 [ffffb954506b3cc8] __bad_area_nosemaphore at ffffffffb2a7ec8c\n #6 [ffffb954506b3d10] do_page_fault at ffffffffb2a7f887\n #7 [ffffb954506b3d40] page_fault at ffffffffb360116e\n    [exception RIP: ttm_resource_manager_debug+0x11]\n    RIP: ffffffffc04afd11  RSP: ffffb954506b3df0  RFLAGS: 00010246\n    RAX: ffff8fe41a6d1200  RBX: 0000000000000000  RCX: 0000000000000940\n    RDX: 0000000000000000  RSI: ffffffffc04b4338  RDI: 0000000000000000\n    RBP: ffffb954506b3e08   R8: ffff8fee3ffad000   R9: 0000000000000000\n    R10: ffff8fe41a76a000  R11: 0000000000000001  R12: 00000000ffffffff\n    R13: 0000000000000001  R14: ffff8fe5bb6f3900  R15: ffff8fe41a6d1200\n    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018\n #8 [ffffb954506b3e00] ttm_resource_manager_show at ffffffffc04afde7 [ttm]\n #9 [ffffb954506b3e30] seq_read at ffffffffb2d8f9f3\n    RIP: 00007f4c4eda8985  RSP: 00007ffdbba9e9f8  RFLAGS: 00000246\n    RAX: ffffffffffffffda  RBX: 000000000037e000  RCX: 00007f4c4eda8985\n    RDX: 000000000037e000  RSI: 00007f4c41573000  RDI: 0000000000000003\n    RBP: 000000000037e000   R8: 0000000000000000   R9: 000000000037fe30\n    R10: 0000000000000000  R11: 0000000000000246  R12: 00007f4c41573000\n    R13: 0000000000000003  R14: 00007f4c41572010  R15: 0000000000000003\n    ORIG_RAX: 0000000000000000  CS: 0033  SS: 002b"
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    "dateReserved": "2024-02-19T14:20:24.197Z",
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmlxsw: spectrum_acl_tcam: Fix possible use-after-free during rehash\n\nThe rehash delayed work migrates filters from one region to another\naccording to the number of available credits.\n\nThe migrated from region is destroyed at the end of the work if the\nnumber of credits is non-negative as the assumption is that this is\nindicative of migration being complete. This assumption is incorrect as\na non-negative number of credits can also be the result of a failed\nmigration.\n\nThe destruction of a region that still has filters referencing it can\nresult in a use-after-free [1].\n\nFix by not destroying the region if migration failed.\n\n[1]\nBUG: KASAN: slab-use-after-free in mlxsw_sp_acl_ctcam_region_entry_remove+0x21d/0x230\nRead of size 8 at addr ffff8881735319e8 by task kworker/0:31/3858\n\nCPU: 0 PID: 3858 Comm: kworker/0:31 Tainted: G        W          6.9.0-rc2-custom-00782-gf2275c2157d8 #5\nHardware name: Mellanox Technologies Ltd. MSN3700/VMOD0005, BIOS 5.11 01/06/2019\nWorkqueue: mlxsw_core mlxsw_sp_acl_tcam_vregion_rehash_work\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0xc6/0x120\n print_report+0xce/0x670\n kasan_report+0xd7/0x110\n mlxsw_sp_acl_ctcam_region_entry_remove+0x21d/0x230\n mlxsw_sp_acl_ctcam_entry_del+0x2e/0x70\n mlxsw_sp_acl_atcam_entry_del+0x81/0x210\n mlxsw_sp_acl_tcam_vchunk_migrate_all+0x3cd/0xb50\n mlxsw_sp_acl_tcam_vregion_rehash_work+0x157/0x1300\n process_one_work+0x8eb/0x19b0\n worker_thread+0x6c9/0xf70\n kthread+0x2c9/0x3b0\n ret_from_fork+0x4d/0x80\n ret_from_fork_asm+0x1a/0x30\n \u003c/TASK\u003e\n\nAllocated by task 174:\n kasan_save_stack+0x33/0x60\n kasan_save_track+0x14/0x30\n __kasan_kmalloc+0x8f/0xa0\n __kmalloc+0x19c/0x360\n mlxsw_sp_acl_tcam_region_create+0xdf/0x9c0\n mlxsw_sp_acl_tcam_vregion_rehash_work+0x954/0x1300\n process_one_work+0x8eb/0x19b0\n worker_thread+0x6c9/0xf70\n kthread+0x2c9/0x3b0\n ret_from_fork+0x4d/0x80\n ret_from_fork_asm+0x1a/0x30\n\nFreed by task 7:\n kasan_save_stack+0x33/0x60\n kasan_save_track+0x14/0x30\n kasan_save_free_info+0x3b/0x60\n poison_slab_object+0x102/0x170\n __kasan_slab_free+0x14/0x30\n kfree+0xc1/0x290\n mlxsw_sp_acl_tcam_region_destroy+0x272/0x310\n mlxsw_sp_acl_tcam_vregion_rehash_work+0x731/0x1300\n process_one_work+0x8eb/0x19b0\n worker_thread+0x6c9/0xf70\n kthread+0x2c9/0x3b0\n ret_from_fork+0x4d/0x80\n ret_from_fork_asm+0x1a/0x30"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The only path into the vulnerable rehash work is local configuration of hardware-offloaded tc flower filters via rtnetlink (`mlxsw_sp_flower_replace` \u2192 `mlxsw_sp_acl_rule_add`), plus the devlink `acl_region_rehash_interval` knob; the multicast-routing ruleset that could be influenced by received traffic explicitly disables rehash, so no received packet reaches this code.\nAC:L - The attacker controls every precondition \u2014 the number, priority and mask diversity of offloaded filters, and hence the eRP/TCAM resource exhaustion that makes migration and its rollback fail \u2014 while the rehash delayed work re-arms itself automatically every 5 s, so there is no race to win and no state outside the attacker\u0027s influence.\nPR:L - Installing offloaded flower filters requires only CAP_NET_ADMIN checked against the owning network namespace\u0027s user_ns (`netlink_net_capable(skb, CAP_NET_ADMIN)`), which an unprivileged user holds in their own user namespace once a switch port is delegated to that netns \u2014 not real root in the initial namespace.\nUI:N - The attacker performs all steps itself \u2014 adding and removing tc flower rules until the device runs out of resources \u2014 and the periodic rehash worker then fires on its own with no victim action.\nS:U - The freed object and all subsequent dereferences are kernel heap memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed `mlxsw_sp_acl_tcam_region` comes from a sprayable general-purpose kmalloc cache and is later dereferenced as `cregion-\u003eregion-\u003etcam_region_info` and `cregion-\u003eparman`, so reclaiming the slot lets the attacker steer reads to arbitrary kernel addresses; per use-after-free scoring this is High.\nI:H - The same stale allocation is used for an indirect call `cregion-\u003eops-\u003eentry_remove(...)` and for `parman_item_remove()`/`rhashtable_remove_fast()`/`list_del()` writes, giving both a control-flow-hijack and a controlled-write primitive; stale `tcam_region_info` is additionally written to the ASIC, corrupting the switch\u0027s hardware ACL state.\nA:H - The confirmed KASAN slab-use-after-free in `mlxsw_sp_acl_ctcam_region_entry_remove()` runs from the `mlxsw_core` workqueue and reliably oopses/panics the kernel, and because the work re-arms every 5 s the condition recurs until the switch is unusable."
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