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  "vulnerabilities": [
    {
      "cve": "CVE-2025-21931",
      "cwe": {
        "id": "CWE-667",
        "name": "Improper Locking"
      },
      "notes": [
        {
          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwpoison, memory_hotplug: lock folio before unmap hwpoisoned folio\n\nCommit b15c87263a69 (\"hwpoison, memory_hotplug: allow hwpoisoned pages to\nbe offlined) add page poison checks in do_migrate_range in order to make\noffline hwpoisoned page possible by introducing isolate_lru_page and\ntry_to_unmap for hwpoisoned page.  However folio lock must be held before\ncalling try_to_unmap.  Add it to fix this problem.\n\nWarning will be produced if folio is not locked during unmap:\n\n  ------------[ cut here ]------------\n  kernel BUG at ./include/linux/swapops.h:400!\n  Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP\n  Modules linked in:\n  CPU: 4 UID: 0 PID: 411 Comm: bash Tainted: G        W          6.13.0-rc1-00016-g3c434c7ee82a-dirty #41\n  Tainted: [W]=WARN\n  Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015\n  pstate: 40400005 (nZcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n  pc : try_to_unmap_one+0xb08/0xd3c\n  lr : try_to_unmap_one+0x3dc/0xd3c\n  Call trace:\n   try_to_unmap_one+0xb08/0xd3c (P)\n   try_to_unmap_one+0x3dc/0xd3c (L)\n   rmap_walk_anon+0xdc/0x1f8\n   rmap_walk+0x3c/0x58\n   try_to_unmap+0x88/0x90\n   unmap_poisoned_folio+0x30/0xa8\n   do_migrate_range+0x4a0/0x568\n   offline_pages+0x5a4/0x670\n   memory_block_action+0x17c/0x374\n   memory_subsys_offline+0x3c/0x78\n   device_offline+0xa4/0xd0\n   state_store+0x8c/0xf0\n   dev_attr_store+0x18/0x2c\n   sysfs_kf_write+0x44/0x54\n   kernfs_fop_write_iter+0x118/0x1a8\n   vfs_write+0x3a8/0x4bc\n   ksys_write+0x6c/0xf8\n   __arm64_sys_write+0x1c/0x28\n   invoke_syscall+0x44/0x100\n   el0_svc_common.constprop.0+0x40/0xe0\n   do_el0_svc+0x1c/0x28\n   el0_svc+0x30/0xd0\n   el0t_64_sync_handler+0xc8/0xcc\n   el0t_64_sync+0x198/0x19c\n  Code: f9407be0 b5fff320 d4210000 17ffff97 (d4210000)\n  ---[ end trace 0000000000000000 ]---",
          "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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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2025-21931"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/3926b572fd073491bde13ec42ee08ac1b337bf4d",
          "url": "https://git.kernel.org/stable/c/3926b572fd073491bde13ec42ee08ac1b337bf4d"
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        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/576a2f4c437c19bec7d05d05b5990f178d2b0f40",
          "url": "https://git.kernel.org/stable/c/576a2f4c437c19bec7d05d05b5990f178d2b0f40"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/629dfc6ba5431056701d4e44830f3409b989955a",
          "url": "https://git.kernel.org/stable/c/629dfc6ba5431056701d4e44830f3409b989955a"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/93df6da64b004f75d307ed08d3f0f1020280d339",
          "url": "https://git.kernel.org/stable/c/93df6da64b004f75d307ed08d3f0f1020280d339"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/af288a426c3e3552b62595c6138ec6371a17dbba",
          "url": "https://git.kernel.org/stable/c/af288a426c3e3552b62595c6138ec6371a17dbba"
        },
        {
          "category": "external",
          "summary": "https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html",
          "url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html"
        }
      ],
      "release_date": "2025-04-01T16:15:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "details": "CVE-2025-21931 is only reachable when a page has already been marked hwpoisoned by a hardware memory error (or via privileged test interfaces) and the system is actively offlining memory through the kernel’s memory‑hotplug path, which is an administrative, root‑writable sysfs operation. The impact is limited to a local availability issue (kernel warning/oops) with no confidentiality or integrity effect and no remote vector. Given these narrow, hardware/error‑dependent preconditions and the DoS‑only outcome, this can be safely deprioritized for managed VM/server deployments.",
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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"
          },
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          "category": "impact",
          "details": "Moderate"
        }
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}