CVE-2025-39782 (GCVE-0-2025-39782)
Vulnerability from cvelistv5
Published
2025-09-11 16:56
Modified
2025-09-11 16:56
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: jbd2: prevent softlockup in jbd2_log_do_checkpoint() Both jbd2_log_do_checkpoint() and jbd2_journal_shrink_checkpoint_list() periodically release j_list_lock after processing a batch of buffers to avoid long hold times on the j_list_lock. However, since both functions contend for j_list_lock, the combined time spent waiting and processing can be significant. jbd2_journal_shrink_checkpoint_list() explicitly calls cond_resched() when need_resched() is true to avoid softlockups during prolonged operations. But jbd2_log_do_checkpoint() only exits its loop when need_resched() is true, relying on potentially sleeping functions like __flush_batch() or wait_on_buffer() to trigger rescheduling. If those functions do not sleep, the kernel may hit a softlockup. watchdog: BUG: soft lockup - CPU#3 stuck for 156s! [kworker/u129:2:373] CPU: 3 PID: 373 Comm: kworker/u129:2 Kdump: loaded Not tainted 6.6.0+ #10 Hardware name: Huawei TaiShan 2280 /BC11SPCD, BIOS 1.27 06/13/2017 Workqueue: writeback wb_workfn (flush-7:2) pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : native_queued_spin_lock_slowpath+0x358/0x418 lr : jbd2_log_do_checkpoint+0x31c/0x438 [jbd2] Call trace: native_queued_spin_lock_slowpath+0x358/0x418 jbd2_log_do_checkpoint+0x31c/0x438 [jbd2] __jbd2_log_wait_for_space+0xfc/0x2f8 [jbd2] add_transaction_credits+0x3bc/0x418 [jbd2] start_this_handle+0xf8/0x560 [jbd2] jbd2__journal_start+0x118/0x228 [jbd2] __ext4_journal_start_sb+0x110/0x188 [ext4] ext4_do_writepages+0x3dc/0x740 [ext4] ext4_writepages+0xa4/0x190 [ext4] do_writepages+0x94/0x228 __writeback_single_inode+0x48/0x318 writeback_sb_inodes+0x204/0x590 __writeback_inodes_wb+0x54/0xf8 wb_writeback+0x2cc/0x3d8 wb_do_writeback+0x2e0/0x2f8 wb_workfn+0x80/0x2a8 process_one_work+0x178/0x3e8 worker_thread+0x234/0x3b8 kthread+0xf0/0x108 ret_from_fork+0x10/0x20 So explicitly call cond_resched() in jbd2_log_do_checkpoint() to avoid softlockup.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/26cb9aad94cb1811d8fae115594cc71fa3d91ab0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3faac5e1d14c63260fd1bf789d96bde3ab3d9e54
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/41f40038de62e8306897cf6840791b268996432a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/429d50cbaff45090d52a1ea850d5de8c14881ee7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/84ff98c1ea19acd3f9389e4bb6061364e943f85e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9d98cf4632258720f18265a058e62fde120c0151
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f683d611518d30334813eecf9a8c687453e2800e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f7ee8fd689e6d534f9fd2494b9266f7998082e65
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/jbd2/checkpoint.c"
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "5.4.297",
              "versionType": "semver"
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              "version": "5.10.241",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.15.190",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.1.149",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.6.103",
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              "status": "unaffected",
              "version": "6.12.44",
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              "version": "6.16.4",
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              "status": "unaffected",
              "version": "6.17-rc3",
              "versionType": "original_commit_for_fix"
            }
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      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\njbd2: prevent softlockup in jbd2_log_do_checkpoint()\n\nBoth jbd2_log_do_checkpoint() and jbd2_journal_shrink_checkpoint_list()\nperiodically release j_list_lock after processing a batch of buffers to\navoid long hold times on the j_list_lock. However, since both functions\ncontend for j_list_lock, the combined time spent waiting and processing\ncan be significant.\n\njbd2_journal_shrink_checkpoint_list() explicitly calls cond_resched() when\nneed_resched() is true to avoid softlockups during prolonged operations.\nBut jbd2_log_do_checkpoint() only exits its loop when need_resched() is\ntrue, relying on potentially sleeping functions like __flush_batch() or\nwait_on_buffer() to trigger rescheduling. If those functions do not sleep,\nthe kernel may hit a softlockup.\n\nwatchdog: BUG: soft lockup - CPU#3 stuck for 156s! [kworker/u129:2:373]\nCPU: 3 PID: 373 Comm: kworker/u129:2 Kdump: loaded Not tainted 6.6.0+ #10\nHardware name: Huawei TaiShan 2280 /BC11SPCD, BIOS 1.27 06/13/2017\nWorkqueue: writeback wb_workfn (flush-7:2)\npstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\npc : native_queued_spin_lock_slowpath+0x358/0x418\nlr : jbd2_log_do_checkpoint+0x31c/0x438 [jbd2]\nCall trace:\n native_queued_spin_lock_slowpath+0x358/0x418\n jbd2_log_do_checkpoint+0x31c/0x438 [jbd2]\n __jbd2_log_wait_for_space+0xfc/0x2f8 [jbd2]\n add_transaction_credits+0x3bc/0x418 [jbd2]\n start_this_handle+0xf8/0x560 [jbd2]\n jbd2__journal_start+0x118/0x228 [jbd2]\n __ext4_journal_start_sb+0x110/0x188 [ext4]\n ext4_do_writepages+0x3dc/0x740 [ext4]\n ext4_writepages+0xa4/0x190 [ext4]\n do_writepages+0x94/0x228\n __writeback_single_inode+0x48/0x318\n writeback_sb_inodes+0x204/0x590\n __writeback_inodes_wb+0x54/0xf8\n wb_writeback+0x2cc/0x3d8\n wb_do_writeback+0x2e0/0x2f8\n wb_workfn+0x80/0x2a8\n process_one_work+0x178/0x3e8\n worker_thread+0x234/0x3b8\n kthread+0xf0/0x108\n ret_from_fork+0x10/0x20\n\nSo explicitly call cond_resched() in jbd2_log_do_checkpoint() to avoid\nsoftlockup."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-11T16:56:32.616Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f683d611518d30334813eecf9a8c687453e2800e"
        },
        {
          "url": "https://git.kernel.org/stable/c/f7ee8fd689e6d534f9fd2494b9266f7998082e65"
        },
        {
          "url": "https://git.kernel.org/stable/c/84ff98c1ea19acd3f9389e4bb6061364e943f85e"
        },
        {
          "url": "https://git.kernel.org/stable/c/26cb9aad94cb1811d8fae115594cc71fa3d91ab0"
        },
        {
          "url": "https://git.kernel.org/stable/c/41f40038de62e8306897cf6840791b268996432a"
        },
        {
          "url": "https://git.kernel.org/stable/c/429d50cbaff45090d52a1ea850d5de8c14881ee7"
        },
        {
          "url": "https://git.kernel.org/stable/c/3faac5e1d14c63260fd1bf789d96bde3ab3d9e54"
        },
        {
          "url": "https://git.kernel.org/stable/c/9d98cf4632258720f18265a058e62fde120c0151"
        }
      ],
      "title": "jbd2: prevent softlockup in jbd2_log_do_checkpoint()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39782",
    "datePublished": "2025-09-11T16:56:32.616Z",
    "dateReserved": "2025-04-16T07:20:57.130Z",
    "dateUpdated": "2025-09-11T16:56:32.616Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39782\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-11T17:15:44.173\",\"lastModified\":\"2025-09-15T15:22:38.297\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\njbd2: prevent softlockup in jbd2_log_do_checkpoint()\\n\\nBoth jbd2_log_do_checkpoint() and jbd2_journal_shrink_checkpoint_list()\\nperiodically release j_list_lock after processing a batch of buffers to\\navoid long hold times on the j_list_lock. However, since both functions\\ncontend for j_list_lock, the combined time spent waiting and processing\\ncan be significant.\\n\\njbd2_journal_shrink_checkpoint_list() explicitly calls cond_resched() when\\nneed_resched() is true to avoid softlockups during prolonged operations.\\nBut jbd2_log_do_checkpoint() only exits its loop when need_resched() is\\ntrue, relying on potentially sleeping functions like __flush_batch() or\\nwait_on_buffer() to trigger rescheduling. If those functions do not sleep,\\nthe kernel may hit a softlockup.\\n\\nwatchdog: BUG: soft lockup - CPU#3 stuck for 156s! [kworker/u129:2:373]\\nCPU: 3 PID: 373 Comm: kworker/u129:2 Kdump: loaded Not tainted 6.6.0+ #10\\nHardware name: Huawei TaiShan 2280 /BC11SPCD, BIOS 1.27 06/13/2017\\nWorkqueue: writeback wb_workfn (flush-7:2)\\npstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\\npc : native_queued_spin_lock_slowpath+0x358/0x418\\nlr : jbd2_log_do_checkpoint+0x31c/0x438 [jbd2]\\nCall trace:\\n native_queued_spin_lock_slowpath+0x358/0x418\\n jbd2_log_do_checkpoint+0x31c/0x438 [jbd2]\\n __jbd2_log_wait_for_space+0xfc/0x2f8 [jbd2]\\n add_transaction_credits+0x3bc/0x418 [jbd2]\\n start_this_handle+0xf8/0x560 [jbd2]\\n jbd2__journal_start+0x118/0x228 [jbd2]\\n __ext4_journal_start_sb+0x110/0x188 [ext4]\\n ext4_do_writepages+0x3dc/0x740 [ext4]\\n ext4_writepages+0xa4/0x190 [ext4]\\n do_writepages+0x94/0x228\\n __writeback_single_inode+0x48/0x318\\n writeback_sb_inodes+0x204/0x590\\n __writeback_inodes_wb+0x54/0xf8\\n wb_writeback+0x2cc/0x3d8\\n wb_do_writeback+0x2e0/0x2f8\\n wb_workfn+0x80/0x2a8\\n process_one_work+0x178/0x3e8\\n worker_thread+0x234/0x3b8\\n kthread+0xf0/0x108\\n ret_from_fork+0x10/0x20\\n\\nSo explicitly call cond_resched() in jbd2_log_do_checkpoint() to avoid\\nsoftlockup.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/26cb9aad94cb1811d8fae115594cc71fa3d91ab0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3faac5e1d14c63260fd1bf789d96bde3ab3d9e54\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/41f40038de62e8306897cf6840791b268996432a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/429d50cbaff45090d52a1ea850d5de8c14881ee7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/84ff98c1ea19acd3f9389e4bb6061364e943f85e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9d98cf4632258720f18265a058e62fde120c0151\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f683d611518d30334813eecf9a8c687453e2800e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f7ee8fd689e6d534f9fd2494b9266f7998082e65\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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