NULL pointer dereference in Linux kernel ADE9000 clkout registration
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
- Fixed
No CVSS vector from any source. Fix status from CNA.
Summary
In the Linux kernel, the iio ade9000 ADC driver is affected from 6.18 before 6.18.56 and from 6.18 before 7.2.10 and from 6.18 before 7.3 (fixed in 6.18.56, 7.2.10 and 7.3). The ade9000_setup_clkout() function passes NULL as a register address when registering a divider clock, so the clock framework dereferences it through readl() during probe. An attacker needs no special access, because probing an ADE9000 configured as a clock provider with an external input clock crashes the kernel.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Description from the CNA
In the Linux kernel, the following vulnerability has been resolved: iio: adc: ade9000: fix NULL pointer dereference in clkout registration ade9000_setup_clkout() passes NULL as the register address when registering a divider clock. During clock registration, the common clock framework calls clk_divider_recalc_rate(), which dereferences the address through readl(). As a result, probing an ADE9000 configured as a clock provider with an external input clock crashes. CLKOUT passes CLKIN through without changing its rate. Register it as a 1:1 fixed-factor clock, which does not require register access. This change does not affect the configuration using the internal clock, for which the driver does not register a clock provider.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
Remediation
Update the Linux kernel to 6.18.56, 7.2.10 or 7.3, which register CLKOUT as a 1:1 fixed-factor clock instead of a divider clock. The sources list no fixed version for Red Hat products not affected by this flaw.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
- Fix · CNA Linux (Linux) Fixed in 6.18.56, 7.2.10, 7.3
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
Not affected: 7 products
- Red Hat Enterprise Linux 10
- 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
- Red Hat OpenShift Container Platform 5
Timeline
- 2026-10-18 Threatist record created from CVE-2026-98676
- 2026-10-18 Alias added: GHSA-qchf-h949-mmvh
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-10-23 Affected versions changed · Red Hat
- 2026-10-23 CVSS score added · Red Hat
- 2026-11-06 Affected versions changed · Red Hat
References
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Sources
- CVE-2026-98676 · CVE Program
- CVE-2026-98676 · NVD
- FIRST EPSS
- GHSA-qchf-h949-mmvh · GitHub Advisory Database · CC BY 4.0
- CVE-2026-98676 · Red Hat security data · CC BY 4.0
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