i2c: imx: Fix slave registration race and error handling

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80678
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 08:16:53 UTC
Updated2026-08-28 08:16:53 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f7414cd6923fd7f78e57086fc964ba2dc25db5c1 754bc62f72fd64b202462367134ac8ce95b005de git Not specified
CNA Linux Linux affected f7414cd6923fd7f78e57086fc964ba2dc25db5c1 cfdf6e13518589f911b7eace6ccb788e4ed87397 git Not specified
CNA Linux Linux affected f7414cd6923fd7f78e57086fc964ba2dc25db5c1 b9f6f4883b9ac86654e75899d0dbf8a7a96ad5d8 git Not specified
CNA Linux Linux affected f7414cd6923fd7f78e57086fc964ba2dc25db5c1 d6748f6802f3eebafaa16a5e5dcfbfb9b3bc173f git Not specified
CNA Linux Linux affected f7414cd6923fd7f78e57086fc964ba2dc25db5c1 12a4f0950a158d98552cbaeacc35edccd8d975fa git Not specified
CNA Linux Linux affected f7414cd6923fd7f78e57086fc964ba2dc25db5c1 614ca6594e301ff682999797c2216e9685558a2b git Not specified
CNA Linux Linux affected f7414cd6923fd7f78e57086fc964ba2dc25db5c1 d64ec362c369bbc33833f7936d5f3a706b0d5c45 git Not specified
CNA Linux Linux affected 5.11 Not specified
CNA Linux Linux unaffected 5.11 semver Not specified
CNA Linux Linux unaffected 5.15.217 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b9f6f4883b9ac86654e75899d0dbf8a7a96ad5d8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cfdf6e13518589f911b7eace6ccb788e4ed87397 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/754bc62f72fd64b202462367134ac8ce95b005de 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/614ca6594e301ff682999797c2216e9685558a2b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/12a4f0950a158d98552cbaeacc35edccd8d975fa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d6748f6802f3eebafaa16a5e5dcfbfb9b3bc173f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d64ec362c369bbc33833f7936d5f3a706b0d5c45 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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