CVE-2026-97938

Что произошло

In the Linux kernel, the following vulnerability has been resolved: reboot: fix cad_pid use-after-free race cad_pid is a single kernel-wide struct pid pointer. proc_do_cad_pid() reads it and passes it to pid_vnr() without protecting the lifetime of the referenced struct pid. A concurrent writer can replace cad_pid and drop the final reference to the old struct pid after the reader has loaded the pointer but before pid_vnr() has finished dereferencing it, causing a use-after-free. kill_cad_pid() has the same lifetime race when it passes cad_pid to kill_pid(). At the time this issue was reported, an unprivileged user could reach the sysctl through user and PID namespaces because cad_pid was registered in pid_table[]. Moving cad_pid back to the global reboot sysctl table corrected that namespace and permission mismatch, but did not fix the underlying lifetime race. Fix this by treating cad_pid as an RCU-protected pointer at both read sites and by waiting for a grace period before dropping the old reference on the write side. call_rcu(&old_pid->rcu, ...) cannot be used here because free_pid() also queues pid->rcu; queueing the same rcu_head twice can corrupt the RCU callback list. Original KASAN crash stack: kernel/pid.c:545 pid_nr_ns() # reads freed pid->level kernel/pid.c:556 pid_vnr() # calls pid_nr_ns() kernel/pid.c:775 proc_do_cad_pid() # calls pid_vnr(cad_pid)

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": "9ec52099e4b8678a60e9f93e41ad87885d64f3e6",
  "lessThan": "0c1a966bc047af2801a70b8eb13f9df5d7ab925f",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "9ec52099e4b8678a60e9f93e41ad87885d64f3e6",
  "lessThan": "ae3e53fe3c1241855e3a88f74877738349948c78",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "9ec52099e4b8678a60e9f93e41ad87885d64f3e6",
  "lessThan": "ad72e2566643fff7f01666d845fb026898155e1f",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "9ec52099e4b8678a60e9f93e41ad87885d64f3e6",
  "lessThan": "9a17b0e053197a6a42cdc75e75a35b17aa662088",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "9ec52099e4b8678a60e9f93e41ad87885d64f3e6",
  "lessThan": "5a88f78df753993469dab4d1831f8fb4256a9468",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "2.6.19"
}

{
  "status": "unaffected",
  "version": "0",
  "lessThan": "2.6.19",
  "versionType": "semver"
}

{
  "status": "unaffected",
  "version": "6.6.160",
  "versionType": "semver",
  "lessThanOrEqual": "6.6.*"
}

{
  "status": "unaffected",
  "version": "6.12.112",
  "versionType": "semver",
  "lessThanOrEqual": "6.12.*"
}

{
  "status": "unaffected",
  "version": "6.18.53",
  "versionType": "semver",
  "lessThanOrEqual": "6.18.*"
}

{
  "status": "unaffected",
  "version": "7.2.7",
  "versionType": "semver",
  "lessThanOrEqual": "7.2.*"
}

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

CVSS: оценки и векторы

Оценка CVSS отсутствует.

Источники и ссылки

{
  "cwes": [],
  "epss": {
    "source": "epss",
    "received_at": "2026-11-01T21:13:18.941446+00:00"
  },
  "title": {
    "source": "cve",
    "received_at": "2026-10-28T21:30:02.216599+00:00"
  },
  "scores": [],
  "status": {
    "source": "cve",
    "received_at": "2026-10-28T21:30:02.216599+00:00"
  },
  "affected": [
    "cve"
  ],
  "published": {
    "source": "cve",
    "received_at": "2026-10-28T21:30:02.216599+00:00"
  },
  "solutions": [],
  "percentile": {
    "source": "epss",
    "received_at": "2026-11-01T21:13:18.941446+00:00"
  },
  "references": [
    "cve"
  ],
  "description": {
    "source": "cve",
    "received_at": "2026-10-28T21:30:02.216599+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. Опубликована29.10.2026, 00:30

Личная заметка и статус

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