i2c: imx: Fix slave registration race and error handling
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 2 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
Summary
In the Linux kernel, the following vulnerability has been resolved: i2c: imx: Fix slave registration race and error handling In i2c_imx_reg_slave(), the slave pointer was assigned before pm_runtime_resume_and_get(). If pm_runtime_resume_and_get() failed, the error path returned without clearing i2c_imx->slave, leaving it non-NULL and causing all subsequent registration attempts to fail with -EBUSY. Additionally, because this driver uses a shared IRQ, the interrupt handler i2c_imx_isr() can execute concurrently and, after acquiring slave_lock, dereference i2c_imx->slave. The previous fix attempt added a lockless i2c_imx->slave = NULL on the error path, but that could race with the ISR under the lock and still cause a NULL pointer dereference. Fix both issues by deferring the assignment of i2c_imx->slave and i2c_imx->last_slave_event to after a successful resume, and by performing the assignment inside the slave_lock critical section. This guarantees that the slave pointer is never left stale on the error path and is always valid when observed by the interrupt handler.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.15.217, 6.1.183, 6.6.151, 6.12.103, 6.18.44, 7.1.8, 7.2
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 |
Not affected: 3 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
Timeline
- 2026-10-02 Threatist record created from CVE-2026-80678
- 2026-10-03 Alias added: GHSA-gjgg-c5pr-g266
- 2026-10-18 CISA SSVC decision points changed
- 2026-10-24 CVSS score changed · Red Hat
References
Other 7
- https://git.kernel.org/stable/c/754bc62f72fd64b202462367134ac8ce95b005de
- https://git.kernel.org/stable/c/cfdf6e13518589f911b7eace6ccb788e4ed87397
- https://git.kernel.org/stable/c/b9f6f4883b9ac86654e75899d0dbf8a7a96ad5d8
- https://git.kernel.org/stable/c/d6748f6802f3eebafaa16a5e5dcfbfb9b3bc173f
- https://git.kernel.org/stable/c/12a4f0950a158d98552cbaeacc35edccd8d975fa
- https://git.kernel.org/stable/c/614ca6594e301ff682999797c2216e9685558a2b
- https://git.kernel.org/stable/c/d64ec362c369bbc33833f7936d5f3a706b0d5c45
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Sources
- CVE-2026-80678 · CVE Program
- CVE-2026-80678 · NVD
- FIRST EPSS
- GHSA-gjgg-c5pr-g266 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-80678 · Red Hat security data · CC BY 4.0
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