{"id":"CVE-2023-52446","summary":"bpf: Fix a race condition between btf_put() and map_free()","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 && rec-\u003erefcount_off \u003e= 0 &&\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---","modified":"2026-04-02T09:42:43.493886Z","published":"2024-02-22T16:21:38.408Z","related":["USN-6818-2","USN-6819-2"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52446.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/59e5791f59dd83e8aa72a4e74217eabb6e8cfd90"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d048dced8ea5eac6723ae873a40567e6f101ea42"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f9ff6ef1c73cd9e1a6bb1ab3e57c5d141a536306"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52446.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-52446"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"958cf2e273f0929c66169e0788031310e8118722"},{"fixed":"d048dced8ea5eac6723ae873a40567e6f101ea42"},{"fixed":"f9ff6ef1c73cd9e1a6bb1ab3e57c5d141a536306"},{"fixed":"59e5791f59dd83e8aa72a4e74217eabb6e8cfd90"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-52446.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}