firmware: qcom: scm: Fix NULL dereference in IRQ handler before __scm is published
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: 4 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
In the Linux kernel, the following vulnerability has been resolved: firmware: qcom: scm: Fix NULL dereference in IRQ handler before __scm is published In qcom_scm_probe(), devm_request_threaded_irq() is called before smp_store_release(&__scm, scm). Two paths can dereference __scm before it is published, both causing a NULL pointer dereference. The IRQ handler receives scm via its data argument but passes only wq_ctx to qcom_scm_waitq_wakeup() and qcom_scm_get_completion(), which then dereference __scm directly. Thread scm through both functions so the IRQ handler path never touches __scm. Non-atomic SMC calls made during probe (e.g. from qcom_tzmem_init via qcom_scm_shm_bridge_enable) can return WAITQ_SLEEP, causing qcom_scm_wait_for_wq_completion() to run before __scm is published and dereference it. Add platform_set_drvdata(pdev, scm) early in probe and change qcom_scm_wait_for_wq_completion() to take the device pointer and use dev_get_drvdata() to reach scm, removing any dependency on __scm.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
Remediation
- Fix · CNA Linux (Linux) Fixed in 6.6.160, 6.12.110, 6.18.52, 7.2.6, 7.3
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet: Fix deferred |
Not affected: 5 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4
Timeline
- 2026-10-02 Threatist record created from CVE-2026-90397
- 2026-10-03 Alias added: GHSA-gcqw-f4ff-hx84
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-10-20 Affected versions changed · Red Hat
- 2026-10-20 CVSS score added · Red Hat
- 2026-10-21 Fix available: Linux/[email protected], Linux/Linux@c9c1e3da0a206270e5df470ca1c82de52190d68c · CNA
- 2026-10-21 1 new reference · CNA
- 2026-10-29 Affected versions changed · Red Hat
- 2026-11-01 Affected versions changed · Red Hat
References
Other 5
- https://git.kernel.org/stable/c/c9c1e3da0a206270e5df470ca1c82de52190d68c
- https://git.kernel.org/stable/c/b451f38cb7f5bca78484362347f039c08c94de95
- https://git.kernel.org/stable/c/1d753df5899ec356272d08bc4718e82844e4bdf0
- https://git.kernel.org/stable/c/f312ef5026678f14caf1378c5f7fffdf667f9c81
- https://git.kernel.org/stable/c/966d23c7e68ea32679275a7e3d2383181002c868
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Sources
- CVE-2026-90397 · CVE Program
- CVE-2026-90397 · NVD
- FIRST EPSS
- GHSA-gcqw-f4ff-hx84 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-90397 · Red Hat security data · CC BY 4.0
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