CVE-2026-99173

Что произошло

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 ->is_freed of the eventfs_inode that dentry->d_fsdata points to, and ->d_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: 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.

Что делать

dpkg-query -W -f='${Package}	${Version}\n'

rpm -qa --qf '%{NAME}\t%{VERSION}-%{RELEASE}\n'

Get-HotFix | Select-Object HotFixID, InstalledOn

Продукты и затронутые версии

{
  "status": "affected",
  "version": "2ef3d120d19faba3dec35b10a025b00db0284373",
  "lessThan": "5819018dc29fb2ac2fd4865d507f9893c89c0624",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "8e556432477e97ad6179c61b61a32bf5f1af2355",
  "lessThan": "dd2c767814a876be0f16f0b7f98a403dc176f51e",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "8e556432477e97ad6179c61b61a32bf5f1af2355",
  "lessThan": "4586ef24ce390e8becb9f3e5852d5d3978b01c33",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "8e556432477e97ad6179c61b61a32bf5f1af2355",
  "lessThan": "45fcfd5d9c10e0aa977ed5b9bd445707e01bb107",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "8e556432477e97ad6179c61b61a32bf5f1af2355",
  "lessThan": "2cd88c498ecff8e22bf4c397b8eb226db70ac343",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "384f383c5aa7bfd619d9f56a513a36e533428186",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "6.6.46",
  "lessThan": "6.6.161",
  "versionType": "semver"
}

{
  "status": "affected",
  "version": "6.10.5",
  "lessThan": "6.11",
  "versionType": "semver"
}

{
  "status": "affected",
  "version": "6.11"
}

{
  "status": "unaffected",
  "version": "0",
  "lessThan": "6.11",
  "versionType": "semver"
}

{
  "status": "unaffected",
  "version": "6.6.161",
  "versionType": "semver",
  "lessThanOrEqual": "6.6.*"
}

{
  "status": "unaffected",
  "version": "6.12.115",
  "versionType": "semver",
  "lessThanOrEqual": "6.12.*"
}

{
  "status": "unaffected",
  "version": "6.18.59",
  "versionType": "semver",
  "lessThanOrEqual": "6.18.*"
}

{
  "status": "unaffected",
  "version": "7.2.13",
  "versionType": "semver",
  "lessThanOrEqual": "7.2.*"
}

{
  "status": "unaffected",
  "version": "7.3",
  "versionType": "original_commit_for_fix",
  "lessThanOrEqual": "*"
}

CVSS: оценки и векторы

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Источники и ссылки

{
  "cwes": [],
  "epss": {
    "source": "epss",
    "received_at": "2026-11-01T21:13:24.328965+00:00"
  },
  "title": {
    "source": "cve",
    "received_at": "2026-11-01T21:02:04.872797+00:00"
  },
  "scores": [
    "cve",
    "ghsa",
    "nvd"
  ],
  "status": {
    "source": "cve",
    "received_at": "2026-11-01T21:02:04.872797+00:00"
  },
  "affected": [
    "cve"
  ],
  "published": {
    "source": "cve",
    "received_at": "2026-11-01T21:02:04.872797+00:00"
  },
  "solutions": [],
  "percentile": {
    "source": "epss",
    "received_at": "2026-11-01T21:13:24.328965+00:00"
  },
  "references": [
    "cve",
    "ghsa",
    "nvd"
  ],
  "description": {
    "source": "cve",
    "received_at": "2026-11-01T21:02:04.872797+00:00"
  },
  "workarounds": [],
  "configurations": []
}

Хронология записи

1. Данные обновлены02.11.2026, 03:33
2. Данные обновлены02.11.2026, 00:13
3. Данные обновлены02.11.2026, 00:02
4. Данные обновлены02.11.2026, 00:01
5. Данные обновлены31.10.2026, 12:00
6. Данные обновлены30.10.2026, 15:58
7. Данные обновлены28.10.2026, 23:53
8. Данные обновлены28.10.2026, 18:00
9. Опубликована28.10.2026, 15:17

Личная заметка и статус

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