{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "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't 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+0x76/0x90   Read of size 1 at addr ff1100010152d8d0 by task walker/97   Call Trace:    \u003cTASK\u003e    tracefs_d_revalidate+0x76/0x90    lookup_fast+0x320/0x640    path_lookupat+0x160/0xb00    filename_lookup+0x1f1/0x5b0    vfs_statx+0xd7/0x3b0    vfs_fstatat+0x4d/0x90    __do_sys_newfstatat+0xa0/0x100    do_syscall_64+0x10e/0x5e0    entry_SYSCALL_64_after_hwframe+0x77/0x7f   [...]   Allocated by task 1:    __kmalloc_cache_noprof+0x249/0x560    eventfs_create_dir+0x7a/0x590    event_create_dir+0x2fb/0xcf0    trace_add_event_call+0xbf/0x150   [...]   Freed by task 11:    kfree+0x1db/0x5b0    srcu_invoke_callbacks+0x3a3/0x620    process_one_work+0x937/0x1810    worker_thread+0x4f1/0xd60  Before commit 8e556432477e (\"eventfs: Use SRCU for freeing eventfs_inodes\") 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.",
  "id": "DEBIAN-CVE-2026-99173",
  "modified": "2026-10-29T05:47:30.865350056Z",
  "published": "2026-10-28T11:17:37.900Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-99173"
    }
  ],
  "upstream": [
    "CVE-2026-99173"
  ]
}