CVE-2026-43482 (GCVE-0-2026-43482)

Vulnerability from cvelistv5 – Published: 2026-05-13 15:08 – Updated: 2026-05-13 15:08
VLAI?
Title
sched_ext: Disable preemption between scx_claim_exit() and kicking helper work
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: f0e1a0643a59bf1f922fa209cec86a170b784f3f , < 41423912f7ac7494ccd6eef411227b4efce740e0 (git)
Affected: f0e1a0643a59bf1f922fa209cec86a170b784f3f , < 522acaae34aa7e05859260056b39c7c030592a0c (git)
Affected: f0e1a0643a59bf1f922fa209cec86a170b784f3f , < 5131dbec2c10961b34f844bc30b400c3fa0bcc72 (git)
Affected: f0e1a0643a59bf1f922fa209cec86a170b784f3f , < 83236b2e43dba00bee5b82eb5758816b1a674f6a (git)
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Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.20 , ≤ 6.18.* (semver)
Unaffected: 6.19.9 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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