GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

GSD-2023-52446

Vulnerability from gsd - Updated: 2024-02-21 06:01
Details
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix a race condition between btf_put() and map_free() When running `./test_progs -j` in my local vm with latest kernel, I once hit a kasan error like below: [ 1887.184724] BUG: KASAN: slab-use-after-free in bpf_rb_root_free+0x1f8/0x2b0 [ 1887.185599] Read of size 4 at addr ffff888106806910 by task kworker/u12:2/2830 [ 1887.186498] [ 1887.186712] CPU: 3 PID: 2830 Comm: kworker/u12:2 Tainted: G OEL 6.7.0-rc3-00699-g90679706d486-dirty #494 [ 1887.188034] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 [ 1887.189618] Workqueue: events_unbound bpf_map_free_deferred [ 1887.190341] Call Trace: [ 1887.190666] <TASK> [ 1887.190949] dump_stack_lvl+0xac/0xe0 [ 1887.191423] ? nf_tcp_handle_invalid+0x1b0/0x1b0 [ 1887.192019] ? panic+0x3c0/0x3c0 [ 1887.192449] print_report+0x14f/0x720 [ 1887.192930] ? preempt_count_sub+0x1c/0xd0 [ 1887.193459] ? __virt_addr_valid+0xac/0x120 [ 1887.194004] ? bpf_rb_root_free+0x1f8/0x2b0 [ 1887.194572] kasan_report+0xc3/0x100 [ 1887.195085] ? bpf_rb_root_free+0x1f8/0x2b0 [ 1887.195668] bpf_rb_root_free+0x1f8/0x2b0 [ 1887.196183] ? __bpf_obj_drop_impl+0xb0/0xb0 [ 1887.196736] ? preempt_count_sub+0x1c/0xd0 [ 1887.197270] ? preempt_count_sub+0x1c/0xd0 [ 1887.197802] ? _raw_spin_unlock+0x1f/0x40 [ 1887.198319] bpf_obj_free_fields+0x1d4/0x260 [ 1887.198883] array_map_free+0x1a3/0x260 [ 1887.199380] bpf_map_free_deferred+0x7b/0xe0 [ 1887.199943] process_scheduled_works+0x3a2/0x6c0 [ 1887.200549] worker_thread+0x633/0x890 [ 1887.201047] ? __kthread_parkme+0xd7/0xf0 [ 1887.201574] ? kthread+0x102/0x1d0 [ 1887.202020] kthread+0x1ab/0x1d0 [ 1887.202447] ? pr_cont_work+0x270/0x270 [ 1887.202954] ? kthread_blkcg+0x50/0x50 [ 1887.203444] ret_from_fork+0x34/0x50 [ 1887.203914] ? kthread_blkcg+0x50/0x50 [ 1887.204397] ret_from_fork_asm+0x11/0x20 [ 1887.204913] </TASK> [ 1887.204913] </TASK> [ 1887.205209] [ 1887.205416] Allocated by task 2197: [ 1887.205881] kasan_set_track+0x3f/0x60 [ 1887.206366] __kasan_kmalloc+0x6e/0x80 [ 1887.206856] __kmalloc+0xac/0x1a0 [ 1887.207293] btf_parse_fields+0xa15/0x1480 [ 1887.207836] btf_parse_struct_metas+0x566/0x670 [ 1887.208387] btf_new_fd+0x294/0x4d0 [ 1887.208851] __sys_bpf+0x4ba/0x600 [ 1887.209292] __x64_sys_bpf+0x41/0x50 [ 1887.209762] do_syscall_64+0x4c/0xf0 [ 1887.210222] entry_SYSCALL_64_after_hwframe+0x63/0x6b [ 1887.210868] [ 1887.211074] Freed by task 36: [ 1887.211460] kasan_set_track+0x3f/0x60 [ 1887.211951] kasan_save_free_info+0x28/0x40 [ 1887.212485] ____kasan_slab_free+0x101/0x180 [ 1887.213027] __kmem_cache_free+0xe4/0x210 [ 1887.213514] btf_free+0x5b/0x130 [ 1887.213918] rcu_core+0x638/0xcc0 [ 1887.214347] __do_softirq+0x114/0x37e The error happens at bpf_rb_root_free+0x1f8/0x2b0: 00000000000034c0 <bpf_rb_root_free>: ; { 34c0: f3 0f 1e fa endbr64 34c4: e8 00 00 00 00 callq 0x34c9 <bpf_rb_root_free+0x9> 34c9: 55 pushq %rbp 34ca: 48 89 e5 movq %rsp, %rbp ... ; if (rec && rec->refcount_off >= 0 && 36aa: 4d 85 ed testq %r13, %r13 36ad: 74 a9 je 0x3658 <bpf_rb_root_free+0x198> 36af: 49 8d 7d 10 leaq 0x10(%r13), %rdi 36b3: e8 00 00 00 00 callq 0x36b8 <bpf_rb_root_free+0x1f8> <==== kasan function 36b8: 45 8b 7d 10 movl 0x10(%r13), %r15d <==== use-after-free load 36bc: 45 85 ff testl %r15d, %r15d 36bf: 78 8c js 0x364d <bpf_rb_root_free+0x18d> So the problem ---truncated---
Aliases
To clipboard 

{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2023-52446"
      ],
      "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix a race condition between btf_put() and map_free()\n\nWhen running `./test_progs -j` in my local vm with latest kernel,\nI once hit a kasan error like below:\n\n  [ 1887.184724] BUG: KASAN: slab-use-after-free in bpf_rb_root_free+0x1f8/0x2b0\n  [ 1887.185599] Read of size 4 at addr ffff888106806910 by task kworker/u12:2/2830\n  [ 1887.186498]\n  [ 1887.186712] CPU: 3 PID: 2830 Comm: kworker/u12:2 Tainted: G           OEL     6.7.0-rc3-00699-g90679706d486-dirty #494\n  [ 1887.188034] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014\n  [ 1887.189618] Workqueue: events_unbound bpf_map_free_deferred\n  [ 1887.190341] Call Trace:\n  [ 1887.190666]  \u003cTASK\u003e\n  [ 1887.190949]  dump_stack_lvl+0xac/0xe0\n  [ 1887.191423]  ? nf_tcp_handle_invalid+0x1b0/0x1b0\n  [ 1887.192019]  ? panic+0x3c0/0x3c0\n  [ 1887.192449]  print_report+0x14f/0x720\n  [ 1887.192930]  ? preempt_count_sub+0x1c/0xd0\n  [ 1887.193459]  ? __virt_addr_valid+0xac/0x120\n  [ 1887.194004]  ? bpf_rb_root_free+0x1f8/0x2b0\n  [ 1887.194572]  kasan_report+0xc3/0x100\n  [ 1887.195085]  ? bpf_rb_root_free+0x1f8/0x2b0\n  [ 1887.195668]  bpf_rb_root_free+0x1f8/0x2b0\n  [ 1887.196183]  ? __bpf_obj_drop_impl+0xb0/0xb0\n  [ 1887.196736]  ? preempt_count_sub+0x1c/0xd0\n  [ 1887.197270]  ? preempt_count_sub+0x1c/0xd0\n  [ 1887.197802]  ? _raw_spin_unlock+0x1f/0x40\n  [ 1887.198319]  bpf_obj_free_fields+0x1d4/0x260\n  [ 1887.198883]  array_map_free+0x1a3/0x260\n  [ 1887.199380]  bpf_map_free_deferred+0x7b/0xe0\n  [ 1887.199943]  process_scheduled_works+0x3a2/0x6c0\n  [ 1887.200549]  worker_thread+0x633/0x890\n  [ 1887.201047]  ? __kthread_parkme+0xd7/0xf0\n  [ 1887.201574]  ? kthread+0x102/0x1d0\n  [ 1887.202020]  kthread+0x1ab/0x1d0\n  [ 1887.202447]  ? pr_cont_work+0x270/0x270\n  [ 1887.202954]  ? kthread_blkcg+0x50/0x50\n  [ 1887.203444]  ret_from_fork+0x34/0x50\n  [ 1887.203914]  ? kthread_blkcg+0x50/0x50\n  [ 1887.204397]  ret_from_fork_asm+0x11/0x20\n  [ 1887.204913]  \u003c/TASK\u003e\n  [ 1887.204913]  \u003c/TASK\u003e\n  [ 1887.205209]\n  [ 1887.205416] Allocated by task 2197:\n  [ 1887.205881]  kasan_set_track+0x3f/0x60\n  [ 1887.206366]  __kasan_kmalloc+0x6e/0x80\n  [ 1887.206856]  __kmalloc+0xac/0x1a0\n  [ 1887.207293]  btf_parse_fields+0xa15/0x1480\n  [ 1887.207836]  btf_parse_struct_metas+0x566/0x670\n  [ 1887.208387]  btf_new_fd+0x294/0x4d0\n  [ 1887.208851]  __sys_bpf+0x4ba/0x600\n  [ 1887.209292]  __x64_sys_bpf+0x41/0x50\n  [ 1887.209762]  do_syscall_64+0x4c/0xf0\n  [ 1887.210222]  entry_SYSCALL_64_after_hwframe+0x63/0x6b\n  [ 1887.210868]\n  [ 1887.211074] Freed by task 36:\n  [ 1887.211460]  kasan_set_track+0x3f/0x60\n  [ 1887.211951]  kasan_save_free_info+0x28/0x40\n  [ 1887.212485]  ____kasan_slab_free+0x101/0x180\n  [ 1887.213027]  __kmem_cache_free+0xe4/0x210\n  [ 1887.213514]  btf_free+0x5b/0x130\n  [ 1887.213918]  rcu_core+0x638/0xcc0\n  [ 1887.214347]  __do_softirq+0x114/0x37e\n\nThe error happens at bpf_rb_root_free+0x1f8/0x2b0:\n\n  00000000000034c0 \u003cbpf_rb_root_free\u003e:\n  ; {\n    34c0: f3 0f 1e fa                   endbr64\n    34c4: e8 00 00 00 00                callq   0x34c9 \u003cbpf_rb_root_free+0x9\u003e\n    34c9: 55                            pushq   %rbp\n    34ca: 48 89 e5                      movq    %rsp, %rbp\n  ...\n  ;       if (rec \u0026\u0026 rec-\u003erefcount_off \u003e= 0 \u0026\u0026\n    36aa: 4d 85 ed                      testq   %r13, %r13\n    36ad: 74 a9                         je      0x3658 \u003cbpf_rb_root_free+0x198\u003e\n    36af: 49 8d 7d 10                   leaq    0x10(%r13), %rdi\n    36b3: e8 00 00 00 00                callq   0x36b8 \u003cbpf_rb_root_free+0x1f8\u003e\n                                        \u003c==== kasan function\n    36b8: 45 8b 7d 10                   movl    0x10(%r13), %r15d\n                                        \u003c==== use-after-free load\n    36bc: 45 85 ff                      testl   %r15d, %r15d\n    36bf: 78 8c                         js      0x364d \u003cbpf_rb_root_free+0x18d\u003e\n\nSo the problem \n---truncated---",
      "id": "GSD-2023-52446",
      "modified": "2024-02-21T06:01:53.392356Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "cve@kernel.org",
        "ID": "CVE-2023-52446",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "Linux",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c",
                          "version_name": "958cf2e273f0",
                          "version_value": "d048dced8ea5"
                        },
                        {
                          "version_value": "not down converted",
                          "x_cve_json_5_version_data": {
                            "defaultStatus": "affected",
                            "versions": [
                              {
                                "status": "affected",
                                "version": "6.2"
                              },
                              {
                                "lessThan": "6.2",
                                "status": "unaffected",
                                "version": "0",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "6.6.*",
                                "status": "unaffected",
                                "version": "6.6.14",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "6.7.*",
                                "status": "unaffected",
                                "version": "6.7.2",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "*",
                                "status": "unaffected",
                                "version": "6.8",
                                "versionType": "original_commit_for_fix"
                              }
                            ]
                          }
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "Linux"
            }
          ]
        }
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix a race condition between btf_put() and map_free()\n\nWhen running `./test_progs -j` in my local vm with latest kernel,\nI once hit a kasan error like below:\n\n  [ 1887.184724] BUG: KASAN: slab-use-after-free in bpf_rb_root_free+0x1f8/0x2b0\n  [ 1887.185599] Read of size 4 at addr ffff888106806910 by task kworker/u12:2/2830\n  [ 1887.186498]\n  [ 1887.186712] CPU: 3 PID: 2830 Comm: kworker/u12:2 Tainted: G           OEL     6.7.0-rc3-00699-g90679706d486-dirty #494\n  [ 1887.188034] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014\n  [ 1887.189618] Workqueue: events_unbound bpf_map_free_deferred\n  [ 1887.190341] Call Trace:\n  [ 1887.190666]  \u003cTASK\u003e\n  [ 1887.190949]  dump_stack_lvl+0xac/0xe0\n  [ 1887.191423]  ? nf_tcp_handle_invalid+0x1b0/0x1b0\n  [ 1887.192019]  ? panic+0x3c0/0x3c0\n  [ 1887.192449]  print_report+0x14f/0x720\n  [ 1887.192930]  ? preempt_count_sub+0x1c/0xd0\n  [ 1887.193459]  ? __virt_addr_valid+0xac/0x120\n  [ 1887.194004]  ? bpf_rb_root_free+0x1f8/0x2b0\n  [ 1887.194572]  kasan_report+0xc3/0x100\n  [ 1887.195085]  ? bpf_rb_root_free+0x1f8/0x2b0\n  [ 1887.195668]  bpf_rb_root_free+0x1f8/0x2b0\n  [ 1887.196183]  ? __bpf_obj_drop_impl+0xb0/0xb0\n  [ 1887.196736]  ? preempt_count_sub+0x1c/0xd0\n  [ 1887.197270]  ? preempt_count_sub+0x1c/0xd0\n  [ 1887.197802]  ? _raw_spin_unlock+0x1f/0x40\n  [ 1887.198319]  bpf_obj_free_fields+0x1d4/0x260\n  [ 1887.198883]  array_map_free+0x1a3/0x260\n  [ 1887.199380]  bpf_map_free_deferred+0x7b/0xe0\n  [ 1887.199943]  process_scheduled_works+0x3a2/0x6c0\n  [ 1887.200549]  worker_thread+0x633/0x890\n  [ 1887.201047]  ? __kthread_parkme+0xd7/0xf0\n  [ 1887.201574]  ? kthread+0x102/0x1d0\n  [ 1887.202020]  kthread+0x1ab/0x1d0\n  [ 1887.202447]  ? pr_cont_work+0x270/0x270\n  [ 1887.202954]  ? kthread_blkcg+0x50/0x50\n  [ 1887.203444]  ret_from_fork+0x34/0x50\n  [ 1887.203914]  ? kthread_blkcg+0x50/0x50\n  [ 1887.204397]  ret_from_fork_asm+0x11/0x20\n  [ 1887.204913]  \u003c/TASK\u003e\n  [ 1887.204913]  \u003c/TASK\u003e\n  [ 1887.205209]\n  [ 1887.205416] Allocated by task 2197:\n  [ 1887.205881]  kasan_set_track+0x3f/0x60\n  [ 1887.206366]  __kasan_kmalloc+0x6e/0x80\n  [ 1887.206856]  __kmalloc+0xac/0x1a0\n  [ 1887.207293]  btf_parse_fields+0xa15/0x1480\n  [ 1887.207836]  btf_parse_struct_metas+0x566/0x670\n  [ 1887.208387]  btf_new_fd+0x294/0x4d0\n  [ 1887.208851]  __sys_bpf+0x4ba/0x600\n  [ 1887.209292]  __x64_sys_bpf+0x41/0x50\n  [ 1887.209762]  do_syscall_64+0x4c/0xf0\n  [ 1887.210222]  entry_SYSCALL_64_after_hwframe+0x63/0x6b\n  [ 1887.210868]\n  [ 1887.211074] Freed by task 36:\n  [ 1887.211460]  kasan_set_track+0x3f/0x60\n  [ 1887.211951]  kasan_save_free_info+0x28/0x40\n  [ 1887.212485]  ____kasan_slab_free+0x101/0x180\n  [ 1887.213027]  __kmem_cache_free+0xe4/0x210\n  [ 1887.213514]  btf_free+0x5b/0x130\n  [ 1887.213918]  rcu_core+0x638/0xcc0\n  [ 1887.214347]  __do_softirq+0x114/0x37e\n\nThe error happens at bpf_rb_root_free+0x1f8/0x2b0:\n\n  00000000000034c0 \u003cbpf_rb_root_free\u003e:\n  ; {\n    34c0: f3 0f 1e fa                   endbr64\n    34c4: e8 00 00 00 00                callq   0x34c9 \u003cbpf_rb_root_free+0x9\u003e\n    34c9: 55                            pushq   %rbp\n    34ca: 48 89 e5                      movq    %rsp, %rbp\n  ...\n  ;       if (rec \u0026\u0026 rec-\u003erefcount_off \u003e= 0 \u0026\u0026\n    36aa: 4d 85 ed                      testq   %r13, %r13\n    36ad: 74 a9                         je      0x3658 \u003cbpf_rb_root_free+0x198\u003e\n    36af: 49 8d 7d 10                   leaq    0x10(%r13), %rdi\n    36b3: e8 00 00 00 00                callq   0x36b8 \u003cbpf_rb_root_free+0x1f8\u003e\n                                        \u003c==== kasan function\n    36b8: 45 8b 7d 10                   movl    0x10(%r13), %r15d\n                                        \u003c==== use-after-free load\n    36bc: 45 85 ff                      testl   %r15d, %r15d\n    36bf: 78 8c                         js      0x364d \u003cbpf_rb_root_free+0x18d\u003e\n\nSo the problem \n---truncated---"
          }
        ]
      },
      "generator": {
        "engine": "bippy-8df59b4913de"
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "n/a"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://git.kernel.org/stable/c/d048dced8ea5eac6723ae873a40567e6f101ea42",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/d048dced8ea5eac6723ae873a40567e6f101ea42"
          },
          {
            "name": "https://git.kernel.org/stable/c/f9ff6ef1c73cd9e1a6bb1ab3e57c5d141a536306",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/f9ff6ef1c73cd9e1a6bb1ab3e57c5d141a536306"
          },
          {
            "name": "https://git.kernel.org/stable/c/59e5791f59dd83e8aa72a4e74217eabb6e8cfd90",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/59e5791f59dd83e8aa72a4e74217eabb6e8cfd90"
          }
        ]
      }
    },
    "nvd.nist.gov": {
      "cve": {
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "BDBBEB0E-D13A-4567-8984-51C5375350B9",
                    "versionEndExcluding": "6.6.14",
                    "versionStartIncluding": "6.2.0",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "0EA3778C-730B-464C-8023-18CA6AC0B807",
                    "versionEndExcluding": "6.7.2",
                    "versionStartIncluding": "6.7.0",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix a race condition between btf_put() and map_free()\n\nWhen running `./test_progs -j` in my local vm with latest kernel,\nI once hit a kasan error like below:\n\n  [ 1887.184724] BUG: KASAN: slab-use-after-free in bpf_rb_root_free+0x1f8/0x2b0\n  [ 1887.185599] Read of size 4 at addr ffff888106806910 by task kworker/u12:2/2830\n  [ 1887.186498]\n  [ 1887.186712] CPU: 3 PID: 2830 Comm: kworker/u12:2 Tainted: G           OEL     6.7.0-rc3-00699-g90679706d486-dirty #494\n  [ 1887.188034] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014\n  [ 1887.189618] Workqueue: events_unbound bpf_map_free_deferred\n  [ 1887.190341] Call Trace:\n  [ 1887.190666]  \u003cTASK\u003e\n  [ 1887.190949]  dump_stack_lvl+0xac/0xe0\n  [ 1887.191423]  ? nf_tcp_handle_invalid+0x1b0/0x1b0\n  [ 1887.192019]  ? panic+0x3c0/0x3c0\n  [ 1887.192449]  print_report+0x14f/0x720\n  [ 1887.192930]  ? preempt_count_sub+0x1c/0xd0\n  [ 1887.193459]  ? __virt_addr_valid+0xac/0x120\n  [ 1887.194004]  ? bpf_rb_root_free+0x1f8/0x2b0\n  [ 1887.194572]  kasan_report+0xc3/0x100\n  [ 1887.195085]  ? bpf_rb_root_free+0x1f8/0x2b0\n  [ 1887.195668]  bpf_rb_root_free+0x1f8/0x2b0\n  [ 1887.196183]  ? __bpf_obj_drop_impl+0xb0/0xb0\n  [ 1887.196736]  ? preempt_count_sub+0x1c/0xd0\n  [ 1887.197270]  ? preempt_count_sub+0x1c/0xd0\n  [ 1887.197802]  ? _raw_spin_unlock+0x1f/0x40\n  [ 1887.198319]  bpf_obj_free_fields+0x1d4/0x260\n  [ 1887.198883]  array_map_free+0x1a3/0x260\n  [ 1887.199380]  bpf_map_free_deferred+0x7b/0xe0\n  [ 1887.199943]  process_scheduled_works+0x3a2/0x6c0\n  [ 1887.200549]  worker_thread+0x633/0x890\n  [ 1887.201047]  ? __kthread_parkme+0xd7/0xf0\n  [ 1887.201574]  ? kthread+0x102/0x1d0\n  [ 1887.202020]  kthread+0x1ab/0x1d0\n  [ 1887.202447]  ? pr_cont_work+0x270/0x270\n  [ 1887.202954]  ? kthread_blkcg+0x50/0x50\n  [ 1887.203444]  ret_from_fork+0x34/0x50\n  [ 1887.203914]  ? kthread_blkcg+0x50/0x50\n  [ 1887.204397]  ret_from_fork_asm+0x11/0x20\n  [ 1887.204913]  \u003c/TASK\u003e\n  [ 1887.204913]  \u003c/TASK\u003e\n  [ 1887.205209]\n  [ 1887.205416] Allocated by task 2197:\n  [ 1887.205881]  kasan_set_track+0x3f/0x60\n  [ 1887.206366]  __kasan_kmalloc+0x6e/0x80\n  [ 1887.206856]  __kmalloc+0xac/0x1a0\n  [ 1887.207293]  btf_parse_fields+0xa15/0x1480\n  [ 1887.207836]  btf_parse_struct_metas+0x566/0x670\n  [ 1887.208387]  btf_new_fd+0x294/0x4d0\n  [ 1887.208851]  __sys_bpf+0x4ba/0x600\n  [ 1887.209292]  __x64_sys_bpf+0x41/0x50\n  [ 1887.209762]  do_syscall_64+0x4c/0xf0\n  [ 1887.210222]  entry_SYSCALL_64_after_hwframe+0x63/0x6b\n  [ 1887.210868]\n  [ 1887.211074] Freed by task 36:\n  [ 1887.211460]  kasan_set_track+0x3f/0x60\n  [ 1887.211951]  kasan_save_free_info+0x28/0x40\n  [ 1887.212485]  ____kasan_slab_free+0x101/0x180\n  [ 1887.213027]  __kmem_cache_free+0xe4/0x210\n  [ 1887.213514]  btf_free+0x5b/0x130\n  [ 1887.213918]  rcu_core+0x638/0xcc0\n  [ 1887.214347]  __do_softirq+0x114/0x37e\n\nThe error happens at bpf_rb_root_free+0x1f8/0x2b0:\n\n  00000000000034c0 \u003cbpf_rb_root_free\u003e:\n  ; {\n    34c0: f3 0f 1e fa                   endbr64\n    34c4: e8 00 00 00 00                callq   0x34c9 \u003cbpf_rb_root_free+0x9\u003e\n    34c9: 55                            pushq   %rbp\n    34ca: 48 89 e5                      movq    %rsp, %rbp\n  ...\n  ;       if (rec \u0026\u0026 rec-\u003erefcount_off \u003e= 0 \u0026\u0026\n    36aa: 4d 85 ed                      testq   %r13, %r13\n    36ad: 74 a9                         je      0x3658 \u003cbpf_rb_root_free+0x198\u003e\n    36af: 49 8d 7d 10                   leaq    0x10(%r13), %rdi\n    36b3: e8 00 00 00 00                callq   0x36b8 \u003cbpf_rb_root_free+0x1f8\u003e\n                                        \u003c==== kasan function\n    36b8: 45 8b 7d 10                   movl    0x10(%r13), %r15d\n                                        \u003c==== use-after-free load\n    36bc: 45 85 ff                      testl   %r15d, %r15d\n    36bf: 78 8c                         js      0x364d \u003cbpf_rb_root_free+0x18d\u003e\n\nSo the problem \n---truncated---"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: bpf: corrige una condici\u00f3n de ejecuci\u00f3n entre btf_put() y map_free() Al ejecutar `./test_progs -j` en mi m\u00e1quina virtual local con el \u00faltimo kernel, una vez encontr\u00e9 un error kasan como a continuaci\u00f3n: [ 1887.184724] ERROR: KASAN: slab-use-after-free en bpf_rb_root_free+0x1f8/0x2b0 [ 1887.185599] Lectura del tama\u00f1o 4 en la direcci\u00f3n ffff888106806910 por tarea kworker/u12:2/2830 [ 1887.186498] [ 1887.186712] CPU: 3 PID: 2830 Comm: kworker/u12:2 Contaminado: G OEL 6.7.0-rc3-00699-g90679706d486-dirty #494 [1887.188034] Nombre de hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0 -0-g155821a1990b-prebuilt.qemu.org 01/04/2014 [1887.189618] Cola de trabajo: events_unbound bpf_map_free_deferred [1887.190341] Seguimiento de llamadas: [1887.190666]  [1887.190949] dump_stack_lv l+0xac/0xe0 [ 1887.191423] ? nf_tcp_handle_invalid+0x1b0/0x1b0 [1887.192019]? p\u00e1nico+0x3c0/0x3c0 [ 1887.192449] print_report+0x14f/0x720 [ 1887.192930] ? preempt_count_sub+0x1c/0xd0 [1887.193459]? __virt_addr_valid+0xac/0x120 [1887.194004]? bpf_rb_root_free+0x1f8/0x2b0 [ 1887.194572] kasan_report+0xc3/0x100 [ 1887.195085] ? bpf_rb_root_free+0x1f8/0x2b0 [ 1887.195668] bpf_rb_root_free+0x1f8/0x2b0 [ 1887.196183] ? __bpf_obj_drop_impl+0xb0/0xb0 [1887.196736]? preempt_count_sub+0x1c/0xd0 [1887.197270]? preempt_count_sub+0x1c/0xd0 [1887.197802]? _raw_spin_unlock+0x1f/0x40 [ 1887.198319] bpf_obj_free_fields+0x1d4/0x260 [ 1887.198883] array_map_free+0x1a3/0x260 [ 1887.199380] bpf_map_free_deferred+0x7b/0xe0 [ 18 87.199943] Process_scheduled_works+0x3a2/0x6c0 [1887.200549] trabajador_thread+0x633/0x890 [1887.201047]? __kthread_parkme+0xd7/0xf0 [ 1887.201574] ? kthread+0x102/0x1d0 [ 1887.202020] kthread+0x1ab/0x1d0 [ 1887.202447] ? pr_cont_work+0x270/0x270 [1887.202954]? kthread_blkcg+0x50/0x50 [ 1887.203444] ret_from_fork+0x34/0x50 [ 1887.203914] ? kthread_blkcg+0x50/0x50 [ 1887.204397] ret_from_fork_asm+0x11/0x20 [ 1887.204913]  [ 1887.204913]  [ 1887.205209] [ 1887.205416] Asignado por tarea 2197: [1887.205881] kasan_set_track+0x3f/0x60 [1887.206366] __kasan_kmalloc +0x6e/0x80 [ 1887.206856] __kmalloc+0xac/0x1a0 [ 1887.207293] btf_parse_fields+0xa15/0x1480 [ 1887.207836] btf_parse_struct_metas+0x566/0x670 [ 1887.208387 ] btf_new_fd+0x294/0x4d0 [ 1887.208851] __sys_bpf+0x4ba/0x600 [ 1887.209292] __x64_sys_bpf+0x41 /0x50 [ 1887.209762] do_syscall_64+0x4c/0xf0 [ 1887.210222] Entry_SYSCALL_64_after_hwframe+0x63/0x6b [ 1887.210868] [ 1887.211074] Liberado por la tarea 36: [ 1887.21146 0] kasan_set_track+0x3f/0x60 [ 1887.211951] kasan_save_free_info+0x28/0x40 [ 1887.212485] ____kasan_slab_free+ 0x101/0x180 [ 1887.213027] __kmem_cache_free+0xe4/0x210 [ 1887.213514] btf_free+0x5b/0x130 [ 1887.213918] rcu_core+0x638/0xcc0 [ 1887.214347] __do_ softirq+0x114/0x37e El error ocurre en bpf_rb_root_free+0x1f8/0x2b0: 00000000000034c0 : ; { 34c0: f3 0f 1e fa endbr64 34c4: e8 00 00 00 00 callq 0x34c9  34c9: 55 pushq %rbp 34ca: 48 89 e5 movq %rsp, %rbp ... ; if (rec \u0026amp;\u0026amp; rec-\u0026gt;refcount_off \u0026gt;= 0 \u0026amp;\u0026amp; 36aa: 4d 85 ed testq %r13, %r13 36ad: 74 a9 je 0x3658  36af: 49 8d 7d 10 leaq 0x10(%r13), %rdi 36b3 : e8 00 00 00 00 callq 0x36b8  \u0026lt;==== funci\u00f3n kasan 36b8: 45 8b 7d 10 movl 0x10(%r13), %r15d \u0026lt;==== carga de uso despu\u00e9s de liberaci\u00f3n 36bc: 45 85 ff testl %r15d, %r15d 36bf: 78 8c js 0x364d  Entonces el problema ---truncado---"
          }
        ],
        "id": "CVE-2023-52446",
        "lastModified": "2024-03-14T19:47:14.733",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2024-02-22T17:15:08.527",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/59e5791f59dd83e8aa72a4e74217eabb6e8cfd90"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/d048dced8ea5eac6723ae873a40567e6f101ea42"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/f9ff6ef1c73cd9e1a6bb1ab3e57c5d141a536306"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-416"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.