CVE-2026-43482

MEDIUM EPSS 2.2%
Published May 13, 20261mo ago · Modified Jun 26, 20263d ago
5.5 CVSS 3.1
Medium
Find Similar
Published May 13, 2026 1mo ago
Last Modified Jun 26, 2026 3d ago

Description

In the Linux kernel, the following vulnerability has been resolved: sched_ext: Disable preemption between scx_claim_exit() and kicking helper work scx_claim_exit() atomically sets exit_kind, which prevents scx_error() from triggering further error handling. After claiming exit, the caller must kick the helper kthread work which initiates bypass mode and teardown. If the calling task gets preempted between claiming exit and kicking the helper work, and the BPF scheduler fails to schedule it back (since error handling is now disabled), the helper work is never queued, bypass mode never activates, tasks stop being dispatched, and the system wedges. Disable preemption across scx_claim_exit() and the subsequent work kicking in all callers - scx_disable() and scx_vexit(). Add lockdep_assert_preemption_disabled() to scx_claim_exit() to enforce the requirement.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
2.2% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 5

VendorProductVersionRange
linuxlinux_kernel*≥6.12  –  <6.12.78
linuxlinux_kernel*≥6.13  –  <6.18.20
linuxlinux_kernel*≥6.19  –  <6.19.9
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 4

  • git.kernel.org https://git.kernel.org/stable/c/41423912f7ac7494ccd6eef411227b4efce740e0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5131dbec2c10961b34f844bc30b400c3fa0bcc72
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/522acaae34aa7e05859260056b39c7c030592a0c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/83236b2e43dba00bee5b82eb5758816b1a674f6a
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/41423912f7ac7494ccd6eef411227b4efce740e0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5131dbec2c10961b34f844bc30b400c3fa0bcc72
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/522acaae34aa7e05859260056b39c7c030592a0c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/83236b2e43dba00bee5b82eb5758816b1a674f6a
    Patch