CVE-2026-98677 (GCVE-0-2026-98677)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:45 – Updated: 2026-10-21 12:55
VLAI
Title
iio: adc: ad_sigma_delta: fix use-after-free on unbind
Summary
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7061 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8bea9af887de4c99a95f93f2ce400ef63e8b4e9b , < 975b09bc680acc60903777b766cdb53b0bf9c9f6 (git)
Affected: 8bea9af887de4c99a95f93f2ce400ef63e8b4e9b , < 84500ae0d976995a6870cb1dca2d124b6b2d6e5a (git)
Affected: 8bea9af887de4c99a95f93f2ce400ef63e8b4e9b , < f20b94a7dc1ff9ade191ce839c984210fdbdc653 (git)
Affected: 8bea9af887de4c99a95f93f2ce400ef63e8b4e9b , < 5663c72bf400231e90777982216797191887a6b9 (git)
Affected: 8bea9af887de4c99a95f93f2ce400ef63e8b4e9b , < 9ee8306121495d2a25aa5d1bfd519f2748786b83 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.113 , ≤ 6.12.* (semver)
Unaffected: 6.18.56 , ≤ 6.18.* (semver)
Unaffected: 7.2.10 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niio: adc: ad_sigma_delta: fix use-after-free on unbind\n\nad_sd_buffer_postenable() allocates sigma_delta-\u003esamples_buf with\ndevm_krealloc() at runtime, so its devres entry sits after all\nprobe-time entries of the driver. devm resources are released in\nreverse allocation order, which means unbind frees samples_buf before\niio_device_unregister() disables the buffers and detaches the trigger\npollfunc. The data ready IRQ is still enabled at that point, so\nad_sd_trigger_handler() can still run and memcpy() incoming samples\ninto the freed samples_buf.\n\nFix this by preallocating the buffer in\ndevm_ad_sd_setup_buffer_and_trigger(), before the triggered buffer and\nthe IRQ are set up, so it is freed only after iio_device_unregister()\nhas drained the trigger handler via free_irq(). Size it for the worst\ncase of all sequencer slots being active; ad_sd_validate_scan_mask()\nalready caps the number of active channels at num_slots.\n\nThis issue was found by an in-house static analysis tool."
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    "dateReserved": "2026-09-25T10:25:14.363Z",
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}



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