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        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
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        "summary": "Canonical URL",
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          "date": "2025-09-11T17:15:00Z",
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          "text": "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.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "known_affected": [
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2025-39782"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/26cb9aad94cb1811d8fae115594cc71fa3d91ab0",
          "url": "https://git.kernel.org/stable/c/26cb9aad94cb1811d8fae115594cc71fa3d91ab0"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/3faac5e1d14c63260fd1bf789d96bde3ab3d9e54",
          "url": "https://git.kernel.org/stable/c/3faac5e1d14c63260fd1bf789d96bde3ab3d9e54"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/41f40038de62e8306897cf6840791b268996432a",
          "url": "https://git.kernel.org/stable/c/41f40038de62e8306897cf6840791b268996432a"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/429d50cbaff45090d52a1ea850d5de8c14881ee7",
          "url": "https://git.kernel.org/stable/c/429d50cbaff45090d52a1ea850d5de8c14881ee7"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/84ff98c1ea19acd3f9389e4bb6061364e943f85e",
          "url": "https://git.kernel.org/stable/c/84ff98c1ea19acd3f9389e4bb6061364e943f85e"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/9d98cf4632258720f18265a058e62fde120c0151",
          "url": "https://git.kernel.org/stable/c/9d98cf4632258720f18265a058e62fde120c0151"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/f683d611518d30334813eecf9a8c687453e2800e",
          "url": "https://git.kernel.org/stable/c/f683d611518d30334813eecf9a8c687453e2800e"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/f7ee8fd689e6d534f9fd2494b9266f7998082e65",
          "url": "https://git.kernel.org/stable/c/f7ee8fd689e6d534f9fd2494b9266f7998082e65"
        },
        {
          "category": "external",
          "summary": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html",
          "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
        },
        {
          "category": "external",
          "summary": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html",
          "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
        },
        {
          "category": "external",
          "summary": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html",
          "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
        },
        {
          "category": "external",
          "summary": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html",
          "url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"
        }
      ],
      "release_date": "2025-09-11T17:15:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-07-24T15:33:42.557821Z",
          "details": "This is a local-only kernel scheduling bug in jbd2’s ext4 checkpoint path that can lead to a watchdog soft lockup (CPU stall), with no confidentiality or integrity impact—the effect is limited to availability. Exploitation requires local code execution capable of generating sustained ext4/JBD2 writeback contention; there is no remote trigger and no privilege escalation. Given these constraints and the specific workload conditions required, enterprise server/VM deployments can reasonably deprioritize this CVE relative to issues that threaten data integrity or confidentiality.",
          "product_ids": [
            "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64",
            "Debian-10:hyperv-daemons-0:4.19.325-1.amd64",
            "Debian-10:libbpf-dev-0:4.19.325-1+tuxcare.els1.amd64",
            "Debian-10:libbpf-dev-0:4.19.325-1.amd64",
            "Debian-10:libbpf4.19-0:4.19.325-1+tuxcare.els1.amd64",
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            "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1+tuxcare.els1.amd64",
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            "Debian-10:linux-cpupower-0:4.19.325-1.amd64",
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            "Debian-10:linux-headers-4.19.0-28-all-0:4.19.325-1.amd64",
            "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64",
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            "Debian-10:linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64",
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          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
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      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ]
    }
  ]
}