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        "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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  "vulnerabilities": [
    {
      "cve": "CVE-2025-39749",
      "notes": [
        {
          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nrcu: Protect ->defer_qs_iw_pending from data race\n\nOn kernels built with CONFIG_IRQ_WORK=y, when rcu_read_unlock() is\ninvoked within an interrupts-disabled region of code [1], it will invoke\nrcu_read_unlock_special(), which uses an irq-work handler to force the\nsystem to notice when the RCU read-side critical section actually ends.\nThat end won't happen until interrupts are enabled at the soonest.\n\nIn some kernels, such as those booted with rcutree.use_softirq=y, the\nirq-work handler is used unconditionally.\n\nThe per-CPU rcu_data structure's ->defer_qs_iw_pending field is\nupdated by the irq-work handler and is both read and updated by\nrcu_read_unlock_special().  This resulted in the following KCSAN splat:\n\n------------------------------------------------------------------------\n\nBUG: KCSAN: data-race in rcu_preempt_deferred_qs_handler / rcu_read_unlock_special\n\nread to 0xffff96b95f42d8d8 of 1 bytes by task 90 on cpu 8:\n rcu_read_unlock_special+0x175/0x260\n __rcu_read_unlock+0x92/0xa0\n rt_spin_unlock+0x9b/0xc0\n __local_bh_enable+0x10d/0x170\n __local_bh_enable_ip+0xfb/0x150\n rcu_do_batch+0x595/0xc40\n rcu_cpu_kthread+0x4e9/0x830\n smpboot_thread_fn+0x24d/0x3b0\n kthread+0x3bd/0x410\n ret_from_fork+0x35/0x40\n ret_from_fork_asm+0x1a/0x30\n\nwrite to 0xffff96b95f42d8d8 of 1 bytes by task 88 on cpu 8:\n rcu_preempt_deferred_qs_handler+0x1e/0x30\n irq_work_single+0xaf/0x160\n run_irq_workd+0x91/0xc0\n smpboot_thread_fn+0x24d/0x3b0\n kthread+0x3bd/0x410\n ret_from_fork+0x35/0x40\n ret_from_fork_asm+0x1a/0x30\n\nno locks held by irq_work/8/88.\nirq event stamp: 200272\nhardirqs last  enabled at (200272): [<ffffffffb0f56121>] finish_task_switch+0x131/0x320\nhardirqs last disabled at (200271): [<ffffffffb25c7859>] __schedule+0x129/0xd70\nsoftirqs last  enabled at (0): [<ffffffffb0ee093f>] copy_process+0x4df/0x1cc0\nsoftirqs last disabled at (0): [<0000000000000000>] 0x0\n\n------------------------------------------------------------------------\n\nThe problem is that irq-work handlers run with interrupts enabled, which\nmeans that rcu_preempt_deferred_qs_handler() could be interrupted,\nand that interrupt handler might contain an RCU read-side critical\nsection, which might invoke rcu_read_unlock_special().  In the strict\nKCSAN mode of operation used by RCU, this constitutes a data race on\nthe ->defer_qs_iw_pending field.\n\nThis commit therefore disables interrupts across the portion of the\nrcu_preempt_deferred_qs_handler() that updates the ->defer_qs_iw_pending\nfield.  This suffices because this handler is not a fast path.",
          "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": {
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        "known_affected": [
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          "Ubuntu-20:linux-headers-5.4.0-225-lowlatency-0:5.4.0-225.245.amd64",
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          "Ubuntu-20:linux-modules-5.4.0-225-lowlatency-0:5.4.0-225.245.amd64",
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          "Ubuntu-20:linux-tools-5.4.0-225-generic-0:5.4.0-225.245.amd64",
          "Ubuntu-20:linux-tools-5.4.0-225-lowlatency-0:5.4.0-225.245.amd64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2025-39749"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/0ad84d62217488e679ecc90e8628980dcc003de3",
          "url": "https://git.kernel.org/stable/c/0ad84d62217488e679ecc90e8628980dcc003de3"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/55e11f6776798b27cf09a7aa0d718415d4fc9cf5",
          "url": "https://git.kernel.org/stable/c/55e11f6776798b27cf09a7aa0d718415d4fc9cf5"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/74f58f382a7c8333f8d09701aefaa25913bdbe0e",
          "url": "https://git.kernel.org/stable/c/74f58f382a7c8333f8d09701aefaa25913bdbe0e"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/90c09d57caeca94e6f3f87c49e96a91edd40cbfd",
          "url": "https://git.kernel.org/stable/c/90c09d57caeca94e6f3f87c49e96a91edd40cbfd"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/90de9c94ea72327cfa9c2c9f6113c23a513af60b",
          "url": "https://git.kernel.org/stable/c/90de9c94ea72327cfa9c2c9f6113c23a513af60b"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/b55947b725f190396f475d5d0c59aa855a4d8895",
          "url": "https://git.kernel.org/stable/c/b55947b725f190396f475d5d0c59aa855a4d8895"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/b5de8d80b5d049f051b95d9b1ee50ae4ab656124",
          "url": "https://git.kernel.org/stable/c/b5de8d80b5d049f051b95d9b1ee50ae4ab656124"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/e35e711c78c8a4c43330c0dcb1c4d507a19c20f4",
          "url": "https://git.kernel.org/stable/c/e35e711c78c8a4c43330c0dcb1c4d507a19c20f4"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/f937759c7432d6151b73e1393b6517661813d506",
          "url": "https://git.kernel.org/stable/c/f937759c7432d6151b73e1393b6517661813d506"
        },
        {
          "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"
        }
      ],
      "release_date": "2025-09-11T17:15:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-03-06T16:38:19.622404Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1772815097",
          "product_ids": [
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            "Ubuntu-20:linux-image-unsigned-5.4.0-225-tuxcare.els7-lowlatency-0:5.4.0-225.245.amd64",
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            "Ubuntu-20:linux-modules-5.4.0-225-tuxcare.els7-lowlatency-0:5.4.0-225.245.amd64",
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          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1772815097"
        },
        {
          "category": "none_available",
          "details": "Affected",
          "product_ids": [
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            "Ubuntu-20:linux-image-unsigned-5.4.0-225-lowlatency-0:5.4.0-225.245.amd64",
            "Ubuntu-20:linux-modules-5.4.0-225-generic-0:5.4.0-225.245.amd64",
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.0,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
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}