{
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      "text": "important"
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    "csaf_version": "2.0",
    "distribution": {
      "text": "Copyright 2024 SUSE LLC. All rights reserved.",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "summary",
        "text": "Security update for kernel-livepatch-MICRO-6-0-RT_Update_7",
        "title": "Title of the patch"
      },
      {
        "category": "description",
        "text": "This update for kernel-livepatch-MICRO-6-0-RT_Update_7 fixes the following issues:\n\n- CVE-2025-22115: btrfs: fix block group refcount race in btrfs_create_pending_block_groups() (bsc#1241579)\n",
        "title": "Description of the patch"
      },
      {
        "category": "details",
        "text": "SUSE-SLE-Micro-6.0-kernel-59",
        "title": "Patchnames"
      },
      {
        "category": "legal_disclaimer",
        "text": "CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).",
        "title": "Terms of use"
      }
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      "contact_details": "https://www.suse.com/support/security/contact/",
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    },
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        "summary": "SUSE ratings",
        "url": "https://www.suse.com/support/security/rating/"
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        "category": "self",
        "summary": "URL of this CSAF notice",
        "url": "https://ftp.suse.com/pub/projects/security/csaf/suse-su-2025_20521-1.json"
      },
      {
        "category": "self",
        "summary": "URL for SUSE-SU-2025:20521-1",
        "url": "https://www.suse.com/support/update/announcement/2025/suse-su-202520521-1/"
      },
      {
        "category": "self",
        "summary": "E-Mail link for SUSE-SU-2025:20521-1",
        "url": "https://lists.suse.com/pipermail/sle-updates/2025-August/041030.html"
      },
      {
        "category": "self",
        "summary": "SUSE Bug 1241579",
        "url": "https://bugzilla.suse.com/1241579"
      },
      {
        "category": "self",
        "summary": "SUSE Bug 1244337",
        "url": "https://bugzilla.suse.com/1244337"
      },
      {
        "category": "self",
        "summary": "SUSE CVE CVE-2025-22115 page",
        "url": "https://www.suse.com/security/cve/CVE-2025-22115/"
      }
    ],
    "title": "Security update for kernel-livepatch-MICRO-6-0-RT_Update_7",
    "tracking": {
      "current_release_date": "2025-07-30T16:17:29Z",
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        "date": "2025-07-30T16:17:29Z",
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      },
      "id": "SUSE-SU-2025:20521-1",
      "initial_release_date": "2025-07-30T16:17:29Z",
      "revision_history": [
        {
          "date": "2025-07-30T16:17:29Z",
          "number": "1",
          "summary": "Current version"
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "kernel-livepatch-6_4_0-30-rt-2-1.3.x86_64",
                "product": {
                  "name": "kernel-livepatch-6_4_0-30-rt-2-1.3.x86_64",
                  "product_id": "kernel-livepatch-6_4_0-30-rt-2-1.3.x86_64"
                }
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            ],
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            "name": "x86_64"
          },
          {
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              {
                "category": "product_name",
                "name": "SUSE Linux Micro 6.0",
                "product": {
                  "name": "SUSE Linux Micro 6.0",
                  "product_id": "SUSE Linux Micro 6.0",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:suse:sl-micro:6.0"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "SUSE Linux Enterprise"
          }
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        "name": "SUSE"
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        "full_product_name": {
          "name": "kernel-livepatch-6_4_0-30-rt-2-1.3.x86_64 as component of SUSE Linux Micro 6.0",
          "product_id": "SUSE Linux Micro 6.0:kernel-livepatch-6_4_0-30-rt-2-1.3.x86_64"
        },
        "product_reference": "kernel-livepatch-6_4_0-30-rt-2-1.3.x86_64",
        "relates_to_product_reference": "SUSE Linux Micro 6.0"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2025-22115",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2025-22115"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix block group refcount race in btrfs_create_pending_block_groups()\n\nBlock group creation is done in two phases, which results in a slightly\nunintuitive property: a block group can be allocated/deallocated from\nafter btrfs_make_block_group() adds it to the space_info with\nbtrfs_add_bg_to_space_info(), but before creation is completely completed\nin btrfs_create_pending_block_groups(). As a result, it is possible for a\nblock group to go unused and have \u0027btrfs_mark_bg_unused\u0027 called on it\nconcurrently with \u0027btrfs_create_pending_block_groups\u0027. This causes a\nnumber of issues, which were fixed with the block group flag\n\u0027BLOCK_GROUP_FLAG_NEW\u0027.\n\nHowever, this fix is not quite complete. Since it does not use the\nunused_bg_lock, it is possible for the following race to occur:\n\nbtrfs_create_pending_block_groups            btrfs_mark_bg_unused\n                                           if list_empty // false\n        list_del_init\n        clear_bit\n                                           else if (test_bit) // true\n                                                list_move_tail\n\nAnd we get into the exact same broken ref count and invalid new_bgs\nstate for transaction cleanup that BLOCK_GROUP_FLAG_NEW was designed to\nprevent.\n\nThe broken refcount aspect will result in a warning like:\n\n  [1272.943527] refcount_t: underflow; use-after-free.\n  [1272.943967] WARNING: CPU: 1 PID: 61 at lib/refcount.c:28 refcount_warn_saturate+0xba/0x110\n  [1272.944731] Modules linked in: btrfs virtio_net xor zstd_compress raid6_pq null_blk [last unloaded: btrfs]\n  [1272.945550] CPU: 1 UID: 0 PID: 61 Comm: kworker/u32:1 Kdump: loaded Tainted: G        W          6.14.0-rc5+ #108\n  [1272.946368] Tainted: [W]=WARN\n  [1272.946585] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Arch Linux 1.16.3-1-1 04/01/2014\n  [1272.947273] Workqueue: btrfs_discard btrfs_discard_workfn [btrfs]\n  [1272.947788] RIP: 0010:refcount_warn_saturate+0xba/0x110\n  [1272.949532] RSP: 0018:ffffbf1200247df0 EFLAGS: 00010282\n  [1272.949901] RAX: 0000000000000000 RBX: ffffa14b00e3f800 RCX: 0000000000000000\n  [1272.950437] RDX: 0000000000000000 RSI: ffffbf1200247c78 RDI: 00000000ffffdfff\n  [1272.950986] RBP: ffffa14b00dc2860 R08: 00000000ffffdfff R09: ffffffff90526268\n  [1272.951512] R10: ffffffff904762c0 R11: 0000000063666572 R12: ffffa14b00dc28c0\n  [1272.952024] R13: 0000000000000000 R14: ffffa14b00dc2868 R15: 000001285dcd12c0\n  [1272.952850] FS:  0000000000000000(0000) GS:ffffa14d33c40000(0000) knlGS:0000000000000000\n  [1272.953458] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  [1272.953931] CR2: 00007f838cbda000 CR3: 000000010104e000 CR4: 00000000000006f0\n  [1272.954474] Call Trace:\n  [1272.954655]  \u003cTASK\u003e\n  [1272.954812]  ? refcount_warn_saturate+0xba/0x110\n  [1272.955173]  ? __warn.cold+0x93/0xd7\n  [1272.955487]  ? refcount_warn_saturate+0xba/0x110\n  [1272.955816]  ? report_bug+0xe7/0x120\n  [1272.956103]  ? handle_bug+0x53/0x90\n  [1272.956424]  ? exc_invalid_op+0x13/0x60\n  [1272.956700]  ? asm_exc_invalid_op+0x16/0x20\n  [1272.957011]  ? refcount_warn_saturate+0xba/0x110\n  [1272.957399]  btrfs_discard_cancel_work.cold+0x26/0x2b [btrfs]\n  [1272.957853]  btrfs_put_block_group.cold+0x5d/0x8e [btrfs]\n  [1272.958289]  btrfs_discard_workfn+0x194/0x380 [btrfs]\n  [1272.958729]  process_one_work+0x130/0x290\n  [1272.959026]  worker_thread+0x2ea/0x420\n  [1272.959335]  ? __pfx_worker_thread+0x10/0x10\n  [1272.959644]  kthread+0xd7/0x1c0\n  [1272.959872]  ? __pfx_kthread+0x10/0x10\n  [1272.960172]  ret_from_fork+0x30/0x50\n  [1272.960474]  ? __pfx_kthread+0x10/0x10\n  [1272.960745]  ret_from_fork_asm+0x1a/0x30\n  [1272.961035]  \u003c/TASK\u003e\n  [1272.961238] ---[ end trace 0000000000000000 ]---\n\nThough we have seen them in the async discard workfn as well. It is\nmost likely to happen after a relocation finishes which cancels discard,\ntears down the block group, etc.\n\nFix this fully by taking the lock arou\n---truncated---",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "SUSE Linux Micro 6.0:kernel-livepatch-6_4_0-30-rt-2-1.3.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2025-22115",
          "url": "https://www.suse.com/security/cve/CVE-2025-22115"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1241578 for CVE-2025-22115",
          "url": "https://bugzilla.suse.com/1241578"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1241579 for CVE-2025-22115",
          "url": "https://bugzilla.suse.com/1241579"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "SUSE Linux Micro 6.0:kernel-livepatch-6_4_0-30-rt-2-1.3.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "SUSE Linux Micro 6.0:kernel-livepatch-6_4_0-30-rt-2-1.3.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2025-07-30T16:17:29Z",
          "details": "important"
        }
      ],
      "title": "CVE-2025-22115"
    }
  ]
}