CVE-2023-53668 (GCVE-0-2023-53668)
Vulnerability from cvelistv5
Published
2025-10-07 15:21
Modified
2025-10-07 15:21
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Fix deadloop issue on reading trace_pipe Soft lockup occurs when reading file 'trace_pipe': watchdog: BUG: soft lockup - CPU#6 stuck for 22s! [cat:4488] [...] RIP: 0010:ring_buffer_empty_cpu+0xed/0x170 RSP: 0018:ffff88810dd6fc48 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000246 RCX: ffffffff93d1aaeb RDX: ffff88810a280040 RSI: 0000000000000008 RDI: ffff88811164b218 RBP: ffff88811164b218 R08: 0000000000000000 R09: ffff88815156600f R10: ffffed102a2acc01 R11: 0000000000000001 R12: 0000000051651901 R13: 0000000000000000 R14: ffff888115e49500 R15: 0000000000000000 [...] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8d853c2000 CR3: 000000010dcd8000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __find_next_entry+0x1a8/0x4b0 ? peek_next_entry+0x250/0x250 ? down_write+0xa5/0x120 ? down_write_killable+0x130/0x130 trace_find_next_entry_inc+0x3b/0x1d0 tracing_read_pipe+0x423/0xae0 ? tracing_splice_read_pipe+0xcb0/0xcb0 vfs_read+0x16b/0x490 ksys_read+0x105/0x210 ? __ia32_sys_pwrite64+0x200/0x200 ? switch_fpu_return+0x108/0x220 do_syscall_64+0x33/0x40 entry_SYSCALL_64_after_hwframe+0x61/0xc6 Through the vmcore, I found it's because in tracing_read_pipe(), ring_buffer_empty_cpu() found some buffer is not empty but then it cannot read anything due to "rb_num_of_entries() == 0" always true, Then it infinitely loop the procedure due to user buffer not been filled, see following code path: tracing_read_pipe() { ... ... waitagain: tracing_wait_pipe() // 1. find non-empty buffer here trace_find_next_entry_inc() // 2. loop here try to find an entry __find_next_entry() ring_buffer_empty_cpu(); // 3. find non-empty buffer peek_next_entry() // 4. but peek always return NULL ring_buffer_peek() rb_buffer_peek() rb_get_reader_page() // 5. because rb_num_of_entries() == 0 always true here // then return NULL // 6. user buffer not been filled so goto 'waitgain' // and eventually leads to an deadloop in kernel!!! } By some analyzing, I found that when resetting ringbuffer, the 'entries' of its pages are not all cleared (see rb_reset_cpu()). Then when reducing the ringbuffer, and if some reduced pages exist dirty 'entries' data, they will be added into 'cpu_buffer->overrun' (see rb_remove_pages()), which cause wrong 'overrun' count and eventually cause the deadloop issue. To fix it, we need to clear every pages in rb_reset_cpu().
References
Impacted products
Vendor Product Version
Linux Linux Version: a5fb833172eca69136e9ee1ada778e404086ab8a
Version: a5fb833172eca69136e9ee1ada778e404086ab8a
Version: a5fb833172eca69136e9ee1ada778e404086ab8a
Version: a5fb833172eca69136e9ee1ada778e404086ab8a
Version: a5fb833172eca69136e9ee1ada778e404086ab8a
Version: a5fb833172eca69136e9ee1ada778e404086ab8a
Version: a5fb833172eca69136e9ee1ada778e404086ab8a
Version: a5fb833172eca69136e9ee1ada778e404086ab8a
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/ring_buffer.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "4.19.291",
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              "version": "5.4.251",
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              "version": "5.10.188",
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              "version": "5.15.121",
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              "version": "6.1.40",
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              "version": "6.4.5",
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              "status": "unaffected",
              "version": "6.5",
              "versionType": "original_commit_for_fix"
            }
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        }
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      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.14.322",
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                  "vulnerable": true
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Fix deadloop issue on reading trace_pipe\n\nSoft lockup occurs when reading file \u0027trace_pipe\u0027:\n\n  watchdog: BUG: soft lockup - CPU#6 stuck for 22s! [cat:4488]\n  [...]\n  RIP: 0010:ring_buffer_empty_cpu+0xed/0x170\n  RSP: 0018:ffff88810dd6fc48 EFLAGS: 00000246\n  RAX: 0000000000000000 RBX: 0000000000000246 RCX: ffffffff93d1aaeb\n  RDX: ffff88810a280040 RSI: 0000000000000008 RDI: ffff88811164b218\n  RBP: ffff88811164b218 R08: 0000000000000000 R09: ffff88815156600f\n  R10: ffffed102a2acc01 R11: 0000000000000001 R12: 0000000051651901\n  R13: 0000000000000000 R14: ffff888115e49500 R15: 0000000000000000\n  [...]\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 00007f8d853c2000 CR3: 000000010dcd8000 CR4: 00000000000006e0\n  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n  Call Trace:\n   __find_next_entry+0x1a8/0x4b0\n   ? peek_next_entry+0x250/0x250\n   ? down_write+0xa5/0x120\n   ? down_write_killable+0x130/0x130\n   trace_find_next_entry_inc+0x3b/0x1d0\n   tracing_read_pipe+0x423/0xae0\n   ? tracing_splice_read_pipe+0xcb0/0xcb0\n   vfs_read+0x16b/0x490\n   ksys_read+0x105/0x210\n   ? __ia32_sys_pwrite64+0x200/0x200\n   ? switch_fpu_return+0x108/0x220\n   do_syscall_64+0x33/0x40\n   entry_SYSCALL_64_after_hwframe+0x61/0xc6\n\nThrough the vmcore, I found it\u0027s because in tracing_read_pipe(),\nring_buffer_empty_cpu() found some buffer is not empty but then it\ncannot read anything due to \"rb_num_of_entries() == 0\" always true,\nThen it infinitely loop the procedure due to user buffer not been\nfilled, see following code path:\n\n  tracing_read_pipe() {\n    ... ...\n    waitagain:\n      tracing_wait_pipe() // 1. find non-empty buffer here\n      trace_find_next_entry_inc()  // 2. loop here try to find an entry\n        __find_next_entry()\n          ring_buffer_empty_cpu();  // 3. find non-empty buffer\n          peek_next_entry()  // 4. but peek always return NULL\n            ring_buffer_peek()\n              rb_buffer_peek()\n                rb_get_reader_page()\n                  // 5. because rb_num_of_entries() == 0 always true here\n                  //    then return NULL\n      // 6. user buffer not been filled so goto \u0027waitgain\u0027\n      //    and eventually leads to an deadloop in kernel!!!\n  }\n\nBy some analyzing, I found that when resetting ringbuffer, the \u0027entries\u0027\nof its pages are not all cleared (see rb_reset_cpu()). Then when reducing\nthe ringbuffer, and if some reduced pages exist dirty \u0027entries\u0027 data, they\nwill be added into \u0027cpu_buffer-\u003eoverrun\u0027 (see rb_remove_pages()), which\ncause wrong \u0027overrun\u0027 count and eventually cause the deadloop issue.\n\nTo fix it, we need to clear every pages in rb_reset_cpu()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-07T15:21:26.164Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0a29dae5786d263016a9aceb1e56bf3fd4cc6fa0"
        },
        {
          "url": "https://git.kernel.org/stable/c/a55e8a3596048c2f7b574049aeb1885b5abba1cc"
        },
        {
          "url": "https://git.kernel.org/stable/c/e84829522fc72bb43556b31575731de0440ac0dd"
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          "url": "https://git.kernel.org/stable/c/5e68f1f3a20fe9b6bde018e353269fbfa289609c"
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        {
          "url": "https://git.kernel.org/stable/c/bb14a93bccc92766b1d9302c6bcbea17d4bce306"
        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/27bdd93e44cc28dd9b94893fae146b83d4f5b31e"
        },
        {
          "url": "https://git.kernel.org/stable/c/7e42907f3a7b4ce3a2d1757f6d78336984daf8f5"
        }
      ],
      "title": "ring-buffer: Fix deadloop issue on reading trace_pipe",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53668",
    "datePublished": "2025-10-07T15:21:26.164Z",
    "dateReserved": "2025-10-07T15:16:59.663Z",
    "dateUpdated": "2025-10-07T15:21:26.164Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53668\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-07T16:15:50.640\",\"lastModified\":\"2025-10-08T19:38:09.863\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nring-buffer: Fix deadloop issue on reading trace_pipe\\n\\nSoft lockup occurs when reading file \u0027trace_pipe\u0027:\\n\\n  watchdog: BUG: soft lockup - CPU#6 stuck for 22s! [cat:4488]\\n  [...]\\n  RIP: 0010:ring_buffer_empty_cpu+0xed/0x170\\n  RSP: 0018:ffff88810dd6fc48 EFLAGS: 00000246\\n  RAX: 0000000000000000 RBX: 0000000000000246 RCX: ffffffff93d1aaeb\\n  RDX: ffff88810a280040 RSI: 0000000000000008 RDI: ffff88811164b218\\n  RBP: ffff88811164b218 R08: 0000000000000000 R09: ffff88815156600f\\n  R10: ffffed102a2acc01 R11: 0000000000000001 R12: 0000000051651901\\n  R13: 0000000000000000 R14: ffff888115e49500 R15: 0000000000000000\\n  [...]\\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n  CR2: 00007f8d853c2000 CR3: 000000010dcd8000 CR4: 00000000000006e0\\n  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\\n  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\\n  Call Trace:\\n   __find_next_entry+0x1a8/0x4b0\\n   ? peek_next_entry+0x250/0x250\\n   ? down_write+0xa5/0x120\\n   ? down_write_killable+0x130/0x130\\n   trace_find_next_entry_inc+0x3b/0x1d0\\n   tracing_read_pipe+0x423/0xae0\\n   ? tracing_splice_read_pipe+0xcb0/0xcb0\\n   vfs_read+0x16b/0x490\\n   ksys_read+0x105/0x210\\n   ? __ia32_sys_pwrite64+0x200/0x200\\n   ? switch_fpu_return+0x108/0x220\\n   do_syscall_64+0x33/0x40\\n   entry_SYSCALL_64_after_hwframe+0x61/0xc6\\n\\nThrough the vmcore, I found it\u0027s because in tracing_read_pipe(),\\nring_buffer_empty_cpu() found some buffer is not empty but then it\\ncannot read anything due to \\\"rb_num_of_entries() == 0\\\" always true,\\nThen it infinitely loop the procedure due to user buffer not been\\nfilled, see following code path:\\n\\n  tracing_read_pipe() {\\n    ... ...\\n    waitagain:\\n      tracing_wait_pipe() // 1. find non-empty buffer here\\n      trace_find_next_entry_inc()  // 2. loop here try to find an entry\\n        __find_next_entry()\\n          ring_buffer_empty_cpu();  // 3. find non-empty buffer\\n          peek_next_entry()  // 4. but peek always return NULL\\n            ring_buffer_peek()\\n              rb_buffer_peek()\\n                rb_get_reader_page()\\n                  // 5. because rb_num_of_entries() == 0 always true here\\n                  //    then return NULL\\n      // 6. user buffer not been filled so goto \u0027waitgain\u0027\\n      //    and eventually leads to an deadloop in kernel!!!\\n  }\\n\\nBy some analyzing, I found that when resetting ringbuffer, the \u0027entries\u0027\\nof its pages are not all cleared (see rb_reset_cpu()). Then when reducing\\nthe ringbuffer, and if some reduced pages exist dirty \u0027entries\u0027 data, they\\nwill be added into \u0027cpu_buffer-\u003eoverrun\u0027 (see rb_remove_pages()), which\\ncause wrong \u0027overrun\u0027 count and eventually cause the deadloop issue.\\n\\nTo fix it, we need to clear every pages in rb_reset_cpu().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0a29dae5786d263016a9aceb1e56bf3fd4cc6fa0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/27bdd93e44cc28dd9b94893fae146b83d4f5b31e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5e68f1f3a20fe9b6bde018e353269fbfa289609c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7e42907f3a7b4ce3a2d1757f6d78336984daf8f5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8b0b63fdac6b70a45614e7d4b30e5bbb93deb007\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a55e8a3596048c2f7b574049aeb1885b5abba1cc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bb14a93bccc92766b1d9302c6bcbea17d4bce306\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e84829522fc72bb43556b31575731de0440ac0dd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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