{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-23199",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-23199"
  ],
  "published": "2026-02-14T16:28:50Z",
  "summary": "procfs: avoid fetching build ID while holding VMA lock",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nprocfs: avoid fetching build ID while holding VMA lock\n\nFix PROCMAP_QUERY to fetch optional build ID only after dropping mmap_lock\nor per-VMA lock, whichever was used to lock VMA under question, to avoid\ndeadlock reported by syzbot:\n\n -> #1 (&mm->mmap_lock){++++}-{4:4}:\n        __might_fault+0xed/0x170\n        _copy_to_iter+0x118/0x1720\n        copy_page_to_iter+0x12d/0x1e0\n        filemap_read+0x720/0x10a0\n        blkdev_read_iter+0x2b5/0x4e0\n        vfs_read+0x7f4/0xae0\n        ksys_read+0x12a/0x250\n        do_syscall_64+0xcb/0xf80\n        entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n -> #0 (&sb->s_type->i_mutex_key#8){++++}-{4:4}:\n        __lock_acquire+0x1509/0x26d0\n        lock_acquire+0x185/0x340\n        down_read+0x98/0x490\n        blkdev_read_iter+0x2a7/0x4e0\n        __kernel_read+0x39a/0xa90\n        freader_fetch+0x1d5/0xa80\n        __build_id_parse.isra.0+0xea/0x6a0\n        do_procmap_query+0xd75/0x1050\n        procfs_procmap_ioctl+0x7a/0xb0\n        __x64_sys_ioctl+0x18e/0x210\n        do_syscall_64+0xcb/0xf80\n        entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n other info that might help us debug this:\n\n  Possible unsafe locking scenario:\n\n        CPU0                    CPU1\n        ----                    ----\n   rlock(&mm->mmap_lock);\n                                lock(&sb->s_type->i_mutex_key#8);\n                                lock(&mm->mmap_lock);\n   rlock(&sb->s_type->i_mutex_key#8);\n\n  *** DEADLOCK ***\n\nThis seems to be exacerbated (as we haven't seen these syzbot reports\nbefore that) by the recent:\n\n\t777a8560fd29 (\"lib/buildid: use __kernel_read() for sleepable context\")\n\nTo make this safe, we need to grab file refcount while VMA is still locked, but\nother than that everything is pretty straightforward. Internal build_id_parse()\nAPI assumes VMA is passed, but it only needs the underlying file reference, so\njust add another variant build_id_parse_file() that expects file passed\ndirectly.\n\n[akpm@linux-foundation.org: fix up kerneldoc]",
  "affected": [
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        "name": "linux"
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        "1:6.12.47-1+rpt1~bookworm",
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-23199"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b9b97e6aeb534315f9646b2090d1a5024c6a4e82"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cbc03ce3e6ce7e21214c3f02218213574c1a2d08"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b5cbacd7f86f4f62b8813688c8e73be94e8e1951"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}