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Vulnerabilities

Vulnerability · CVE-2026-99217

REJECTED: CVE-2026-99217: fork: release the files of a failed fork after sched_cancel_fork()

Published Nov 2, 2026 · Linux Linux Kernel

Last checked Nov 4, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-99217. EPSS is 0.17%. Act only if a listed version of Linux Linux Kernel is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium4.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.17%
Remediation
Vendor / distro source
Affected products
linux kernel

In the Linux kernel, the following vulnerability has been resolved: fork: release the files of a failed fork after sched_cancel_fork() Reorder copy_process() cleanup so sched_fork() taking scx_fork_rwsem scx_pre_fork() is safe and isn't held around exiting files. Right now, a fork that fails while another thread closed the bpf link fd will deadlock against its own read side. It also blocks every fork on the system: copy_process() holds scx_fork_rwsem for read exit_files() close_files() filp_close_sync() bpf_scx_unreg() kthread_flush_work() waits for the disable work scx_root_disable() percpu_down_write(&scx_fork_rwsem) Simply release the child's files after sched_cancel_fork() dropped the lock. The task starts out as a copy of its parent so p->files points to the parent's table until copy_

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • linux kernelversion unspecified

How to fix CVE-2026-99217

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-99217. EPSS is 0.17%. Act only if a listed version of Linux Linux Kernel is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-833. EPSS 0.17%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Nov 3, 2026 · OpenCVE

    Detected

    CVE-2026-99217 is named on the public OpenCVE page.

Sources

  • CVE.orgVulnerability recordCVE-2026-99217

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-99217

    30-day exploitation probability 0.17%

    first.org
  • Linux Kernel CVEVendor advisoryCVE-2026-99217

    CVE-2026-99217 has now been rejected and is no longer a valid CVE.

    git.kernel.org
  • OpenCVEVendor advisoryCVE-2026-99217

    CVE-2026-99217 is named on the public OpenCVE page.

    opencve.io
  • Red Hat Security DataVendor advisoryCVE-2026-99217

    kernel: kernel: Denial of Service via deadlock during failed process creation

    access.redhat.com
  • Tenable CVE DatabaseVulnerability recordCVE-2026-99217

    In the Linux kernel, the following vulnerability has been resolved: fork: release the files of a failed fork after sched_cancel_fork() Reorder copy_process() cleanup so sched_fork() taking scx_fork_rwsem scx_pre_fork() is safe and isn't held around exiting files. Right now, a fork that fails while another thread closed the bpf link fd will deadlock against its own read side. It also blocks every f

    tenable.com

Freshness

Last verified in this catalog Nov 3, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Linux Kernel CVENov 4, 2026
  • CVE.orgNov 4, 2026
  • FIRST EPSSNov 3, 2026
  • Tenable CVE DatabaseNov 3, 2026
  • Red Hat Security DataNov 3, 2026
  • OpenCVENov 3, 2026