CVE-2026-98677: Linux Vulnerability

Description

In the Linux kernel, the following vulnerability has been resolved: iio: adc: ad_sigma_delta: fix use-after-free on unbind ad_sd_buffer_postenable() allocates sigma_delta->samples_buf with devm_krealloc() at runtime, so its devres entry sits after all probe-time entries of the driver. devm resources are released in reverse allocation order, which means unbind frees samples_buf before iio_device_unregister() disables the buffers and detaches the trigger pollfunc. The data ready IRQ is still enabled at that point, so ad_sd_trigger_handler() can still run and memcpy() incoming samples into the freed samples_buf. Fix this by preallocating the buffer in devm_ad_sd_setup_buffer_and_trigger(), before the triggered buffer and the IRQ are set up, so it is freed only after iio_device_unregister() has drained the trigger handler via free_irq(). Size it for the worst case of all sequencer slots being active; ad_sd_validate_scan_mask() already caps the number of active channels at num_slots. This issue was found by an in-house static analysis tool.

Metrics

EPSS Probability

0.20%

9.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= 8bea9af887de4c99a95f93f2ce400ef63e8b4e9b, < b2a991d33f1e2207052fe745d1fe459db8b365e2; >= 8bea9af887de4c99a95f93f2ce400ef63e8b4e9b, < 975b09bc680acc60903777b766cdb53b0bf9c9f6; >= 8bea9af887de4c99a95f93f2ce400ef63e8b4e9b, < 84500ae0d976995a6870cb1dca2d124b6b2d6e5a; >= 8bea9af887de4c99a95f93f2ce400ef63e8b4e9b, < f20b94a7dc1ff9ade191ce839c984210fdbdc653; >= 8bea9af887de4c99a95f93f2ce400ef63e8b4e9b, < 5663c72bf400231e90777982216797191887a6b9; >= 8bea9af887de4c99a95f93f2ce400ef63e8b4e9b, < 9ee8306121495d2a25aa5d1bfd519f2748786b83
Linux	Linux	5.19

References

Timeline

Published: Oct 18, 2026
Last Modified: Oct 30, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-98677?

In the Linux kernel, the following vulnerability has been resolved: iio: adc: ad_sigma_delta: fix use-after-free on unbind ad_sd_buffer_postenable() allocates sigma_delta->samples_buf with devm_krealloc() at runtime, so its devres entry sits after all probe-time entries of the driver. devm resources are released in reverse allocation order, which means unbind frees samples_buf before iio_device_unregister() disables the buffers and detaches the trigger pollfunc. The data ready IRQ is still enabled at that point, so ad_sd_trigger_handler() can still run and memcpy() incoming samples into the freed samples_buf. Fix this by preallocating the buffer in devm_ad_sd_setup_buffer_and_trigger(), before the triggered buffer and the IRQ are set up, so it is freed only after iio_device_unregister() has drained the trigger handler via free_irq(). Size it for the worst case of all sequencer slots being active; ad_sd_validate_scan_mask() already caps the number of active channels at num_slots. This issue was found by an in-house static analysis tool.

How severe is CVE-2026-98677?

Severity scoring for CVE-2026-98677 is pending analysis. The EPSS model estimates a 0.20% probability of exploitation in the next 30 days.

How do I fix CVE-2026-98677?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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