{"id":"AZL-108731","summary":"CVE-2026-98677 affecting package kernel 6.6.157.1-1","details":"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.","modified":"2026-10-19T14:16:49.221090427Z","published":"2026-10-18T16:17:21Z","upstream":["CVE-2026-98677"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98677"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"6.6.157.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-108731.json"}}],"schema_version":"1.9.0"}