{
  "cveId": "CVE-2026-99173",
  "url": "https://patchblox.com/security/cve/CVE-2026-99173",
  "summary": "CVE-2026-99173 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-99173, released November 3, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  eventfs: Free the eventfs_inode after an rcu gra...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  eventfs: Free the eventfs_inode after an rcu grace period too  tracefs_d_revalidate() reads -\u003Eis_freed of the eventfs_inode that dentry-\u003Ed_fsdata points to, and -\u003Ed_revalidate() is called in rcu pathwalk mode with nothing but rcu_read_lock() held. The dentry itself stays around for such a walker, but tracefs_d_release() drops its reference to the eventfs_inode when the dentry is killed, and release_ei() then frees it after a grace period of eventfs_srcu. An SRCU grace period doesn\u0027t wait for rcu_read_lock() sections, so the walker can read an eventfs_inode that is already gone.  With a pathwalk held up in tracefs_d_revalidate() while the dentry goes away:    BUG: KASAN: slab-use-after-free in tracefs_d_revalidate\u002B0x76/0x90   Read of size 1 at addr ff1100010152d8d0 by task walker/97   Call Trace:    \u003CTASK\u003E    tracefs_d_revalidate\u002B0x76/0x90    lookup_fast\u002B0x320/0x640    path_lookupat\u002B0x160/0xb00    filename_lookup\u002B0x1f1/0x5b0    vfs_statx\u002B0xd7/0x3b0    vfs_fstatat\u002B0x4d/0x90    __do_sys_newfstatat\u002B0xa0/0x100    do_syscall_64\u002B0x10e/0x5e0    entry_SYSCALL_64_after_hwframe\u002B0x77/0x7f   [...]   Allocated by task 1:    __kmalloc_cache_noprof\u002B0x249/0x560    eventfs_create_dir\u002B0x7a/0x590    event_create_dir\u002B0x2fb/0xcf0    trace_add_event_call\u002B0xbf/0x150   [...]   Freed by task 11:    kfree\u002B0x1db/0x5b0    srcu_invoke_callbacks\u002B0x3a3/0x620    process_one_work\u002B0x937/0x1810    worker_thread\u002B0x4f1/0xd60  Before commit 8e556432477e (\u0022eventfs: Use SRCU for freeing eventfs_inodes\u0022) release_ei() used call_rcu(), which covered the walker, while eventfs_iterate() needs the SRCU grace period. Wait for both and chain call_rcu() from the SRCU callback.",
  "published": "2026-10-28T11:17:37Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00125,
  "epssPercentile": 0.02256,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-2",
      "fix": "DEBIAN-CVE-2026-99173",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99173",
      "released": "2026-11-03T18:58:21Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.13-1",
      "fix": "DEBIAN-CVE-2026-99173",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99173",
      "released": "2026-11-03T18:58:21Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}