CVE-2026-98982

Что произошло

In the Linux kernel, the following vulnerability has been resolved: namespace: don't let a pseudo dentry become the root of a mount d_alloc_pseudo() hands out dentries for pipes, sockets and other files that are never anyone's child or parent. They carry DCACHE_NORCU and dentry_free() frees them right away because no lockless path walk can ever reach them. That holds as long as such a dentry isn't the root of a mount. But bind mounting /proc/self/fd/ of such a file does exactly that. Most callers of alloc_file_pseudo() put their files on kernel-internal mounts and may_copy_tree() refuses those. bpf_token_create() doesn't. It places the token file on the bpffs mount the caller handed it and that mount is in the caller's mount namespace so the clone goes through: mount --bind /proc/self/fd/ open_tree(tokfd, "", AT_EMPTY_PATH | OPEN_TREE_CLONE) + move_mount() __follow_mount_rcu() then loads ->mnt_root of that mount, reads d_seq and d_flags of the dentry and only then checks mount_lock. The dentry can be gone by then. The final mntput() of an unmounted parent unhooks a child that stayed attached to it under mount_lock alone. When the child's holder does the final put right after that the root is dput() and freed immediately while a walker that found the mount hashed still looks at it. Refuse to clone a mount with a DCACHE_NORCU dentry as its root. Nothing sensible can be done with a bind mount of a bpf token anyway.

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": "35f96de04127d332a5c5e8a155d31f452f88c76d",
  "lessThan": "a256e31e0c54c4c37d2523aa52faabdcdd2ebc07",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "35f96de04127d332a5c5e8a155d31f452f88c76d",
  "lessThan": "7e1c466011ba9e64d43075396badc03191bcee44",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "35f96de04127d332a5c5e8a155d31f452f88c76d",
  "lessThan": "00287afa7cd989efdbf5822b7efac33cce7d489a",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "35f96de04127d332a5c5e8a155d31f452f88c76d",
  "lessThan": "b138e16fb1e81376cea89f727dda7bfccd140de4",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "6.9"
}

{
  "status": "unaffected",
  "version": "0",
  "lessThan": "6.9",
  "versionType": "semver"
}

{
  "status": "unaffected",
  "version": "6.12.113",
  "versionType": "semver",
  "lessThanOrEqual": "6.12.*"
}

{
  "status": "unaffected",
  "version": "6.18.57",
  "versionType": "semver",
  "lessThanOrEqual": "6.18.*"
}

{
  "status": "unaffected",
  "version": "7.2.11",
  "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

Источники и ссылки

{
  "cwes": [],
  "epss": {
    "source": "epss",
    "received_at": "2026-11-01T21:13:22.700979+00:00"
  },
  "title": {
    "source": "cve",
    "received_at": "2026-10-28T20:15:08.489933+00:00"
  },
  "scores": [
    "cve"
  ],
  "status": {
    "source": "cve",
    "received_at": "2026-10-28T20:15:08.489933+00:00"
  },
  "affected": [
    "cve"
  ],
  "published": {
    "source": "cve",
    "received_at": "2026-10-28T20:15:08.489933+00:00"
  },
  "solutions": [],
  "percentile": {
    "source": "epss",
    "received_at": "2026-11-01T21:13:22.700979+00:00"
  },
  "references": [
    "cve"
  ],
  "description": {
    "source": "cve",
    "received_at": "2026-10-28T20:15:08.489933+00:00"
  },
  "workarounds": [],
  "configurations": []
}

Хронология записи

1. Данные обновлены02.11.2026, 00:13
2. Данные обновлены31.10.2026, 12:00
3. Данные обновлены29.10.2026, 12:47
4. Опубликована28.10.2026, 23:15

Личная заметка и статус

Другие CVE того же продукта