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TI-2026-83882 Aliases CVE-2026-99217GHSA-qvc7-5g9j-c6v2

Deadlock in Linux kernel fork cleanup when a fork fails

Priority LOW 22Published · Updated

Key facts

Attack vector
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Privileges required
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User interaction
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Attack complexity
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Impact type
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Confidentiality · integrity · availability
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Fix status
Partial Red Hat: 7 without a fix

No CVSS vector from any source. Fix status from CNA and Red Hat.

Summary

The Linux kernel is affected in versions before 6.12.115, 6.18.60, 7.2.14 and 7.3.1, and in earlier commit ranges. In the fork path, a failed fork releases its files while still holding the scheduler fork lock, so the thread can deadlock against itself. This can also block every fork on the system when another thread closes a BPF link file descriptor during the failed fork.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

Description from the CNA

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_files() replaces it. exit_files() must not run for a fork that failed before that. Clear p->files up front so exit_files() is a no-op for those and make copy_files() set it explicitly for CLONE_FILES.

Why it matters now

EPSS 0.00168 6th percentileScored 2026-11-03
Fix Partial Linux (Linux): 6.12.115, 6.18.60, 7.2.14 +1Red Hat: 7 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinuxbefore 6.12.115; before 6.18.60; before 7.2.14; before 7.3.16.12.115, 6.18.60, 7.2.14, 7.3.1Patch availableCNA
LinuxLinux—6.12.115, 6.18.60, 7.2.14, 7.3.1Patch availableCNA
  • Linux VendorLinux Affected before 6.12.115; before 6.18.60; before 7.2.14; before 7.3.1 Fixed in 6.12.115, 6.18.60, 7.2.14, 7.3.1 Patch available CNA
  • Linux VendorLinux Affected — Fixed in 6.12.115, 6.18.60, 7.2.14, 7.3.1 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*——Linux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions — — ·Linux

Remediation

Linux kernel fixes are available in 6.12.115, 6.18.60, 7.2.14 and 7.3.1. Red Hat lists the plan as none available for Red Hat Enterprise Linux 7, 8, 9 and 10 and for Red Hat OpenShift Container Platform 4 and 5, and as no fix planned for Red Hat Enterprise Linux 6.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

  • Fix · CNA Linux (Linux) Fixed in 6.12.115, 6.18.60, 7.2.14, 7.3.1
  • Fix · CNA Linux (Linux) Fixed in 6.12.115, 6.18.60, 7.2.14, 7.3.1

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Red Hat OpenShift Container Platform 4AffectedNo fix yet: Fix deferred
Red Hat OpenShift Container Platform 5AffectedNo fix yet: Fix deferred

Timeline

  1. 2026-11-02 Threatist record created from CVE-2026-99217
  2. 2026-11-02 Alias added: GHSA-qvc7-5g9j-c6v2
  3. 2026-11-03 Affected versions changed · Red Hat
  4. 2026-11-03 CVSS score added · Red Hat

References

Other 4

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2021-02452 Incorrect authorization in Ubuntu linux kernel KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
See all 21741 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences