CVE-2026-98260

Что произошло

In the Linux kernel, the following vulnerability has been resolved: exec: Cleanup POSIX timers right after de_thread() A per-thread CPU timer holds a reference to the PID of the thread it is attached to and, while it is armed, its node is queued in that thread's posix_cputimers. The task is looked up by that PID. When a non-leader thread exec()s, de_thread() changes which task owns that PID. pid_task(timer->it.cpu.pid, PIDTYPE_PID) then returns NULL, but the node is still queued on tsk, which is alive. timer_lock_sighand() takes a failed lookup to mean that the node is already dequeued, so it has nothing to undo. begin_new_exec() calls posix_cpu_timers_exit(me) right after exec_task_namespaces() and that removes the leftover node, so the state normally stays invisible. But bprm->point_of_no_return is set before de_thread(), so if unshare_files(), set_mm_exe_file(), exec_mmap() or exec_task_namespaces() fails, the task dies before it gets there. exit_itimers() then frees the k_itimer while its node is still queued, and reaping tsk later erases that freed node from the rbtree. In short: the non-leader thread B the parent timer_create(CLOCK_THREAD_CPUTIME_ID) timer_settime() arm_timer() // the node is queued on B execve() de_thread(B) exchange_tids(B, leader) // B's PID now belongs to the leader release_task(leader) __exit_signal(leader) posix_cpu_timers_exit(leader) // cleans leader's queue, not B's __unhash_process(leader) // that PID has no task anymore exec_mmap() mmap_read_lock_killable(old_mm) kill(B, SIGKILL) // -EINTR get_signal() do_exit() exit_itimers() posix_timer_delete() posix_cpu_timer_del() posix_timer_unhash_and_free() // freed while still queued wait4() release_task(B) posix_cpu_timers_exit(B) cleanup_timerqueue() timerqueue_del() // use-after-free Move the POSIX timer cleanup right after de_thread() before any of the later failure conditions brings the task into do_exit(). [ tglx: Move the cleanup right after de_thread() ]

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": "55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59",
  "lessThan": "f6c93e8ecaaf12959b7ef6eb611351001db2ff5d",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59",
  "lessThan": "6f1977cea3e85cd8ab55fb337d3e1725fe61d1ce",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59",
  "lessThan": "d9ae467e617ca29b825493a362bf0d75ad5f4ac3",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59",
  "lessThan": "75aa08b93c65766040f9ca99f41ac85ad22596b6",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59",
  "lessThan": "d602877baf36c43c788a5f472c977e0be414029f",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59",
  "lessThan": "acb03d3881818581052924a9bbbe92b8741ed448",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "5.7"
}

{
  "status": "unaffected",
  "version": "0",
  "lessThan": "5.7",
  "versionType": "semver"
}

{
  "status": "unaffected",
  "version": "6.1.191",
  "versionType": "semver",
  "lessThanOrEqual": "6.1.*"
}

{
  "status": "unaffected",
  "version": "6.6.158",
  "versionType": "semver",
  "lessThanOrEqual": "6.6.*"
}

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

{
  "status": "unaffected",
  "version": "6.18.54",
  "versionType": "semver",
  "lessThanOrEqual": "6.18.*"
}

{
  "status": "unaffected",
  "version": "7.2.8",
  "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": "2026-11-02T21:15:46.193384+00:00"
  },
  "title": {
    "source": "cve",
    "received_at": "2026-10-30T12:57:41.845325+00:00"
  },
  "scores": [
    "cve",
    "ghsa",
    "nvd"
  ],
  "status": {
    "source": "cve",
    "received_at": "2026-10-30T12:57:41.845325+00:00"
  },
  "affected": [
    "cve"
  ],
  "published": {
    "source": "cve",
    "received_at": "2026-10-30T12:57:41.845325+00:00"
  },
  "solutions": [],
  "percentile": {
    "source": "epss",
    "received_at": "2026-11-02T21:15:46.193384+00:00"
  },
  "references": [
    "cve",
    "ghsa",
    "nvd"
  ],
  "description": {
    "source": "cve",
    "received_at": "2026-10-30T12:57:41.845325+00:00"
  },
  "workarounds": [],
  "configurations": []
}

Хронология записи

1. Данные обновлены03.11.2026, 00:15
2. Данные обновлены02.11.2026, 03:33
3. Данные обновлены02.11.2026, 00:13
4. Данные обновлены31.10.2026, 12:00
5. Данные обновлены30.10.2026, 20:51
6. Данные обновлены30.10.2026, 15:58
7. Данные обновлены29.10.2026, 12:47
8. Опубликована28.10.2026, 23:15

Личная заметка и статус

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