{"id":"CVE-2026-98677","state":"PUBLISHED","title":"iio: adc: ad_sigma_delta: fix use-after-free on unbind","description":"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->samples_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.","publishedAt":"2026-10-18T15:45:33.871Z","updatedAt":"2026-10-30T12:38:40.900Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8bea9af887de4c99a95f93f2ce400ef63e8b4e9b","status":"affected","lessThan":"b2a991d33f1e2207052fe745d1fe459db8b365e2","versionType":"git"},{"version":"8bea9af887de4c99a95f93f2ce400ef63e8b4e9b","status":"affected","lessThan":"975b09bc680acc60903777b766cdb53b0bf9c9f6","versionType":"git"},{"version":"8bea9af887de4c99a95f93f2ce400ef63e8b4e9b","status":"affected","lessThan":"84500ae0d976995a6870cb1dca2d124b6b2d6e5a","versionType":"git"},{"version":"8bea9af887de4c99a95f93f2ce400ef63e8b4e9b","status":"affected","lessThan":"f20b94a7dc1ff9ade191ce839c984210fdbdc653","versionType":"git"},{"version":"8bea9af887de4c99a95f93f2ce400ef63e8b4e9b","status":"affected","lessThan":"5663c72bf400231e90777982216797191887a6b9","versionType":"git"},{"version":"8bea9af887de4c99a95f93f2ce400ef63e8b4e9b","status":"affected","lessThan":"9ee8306121495d2a25aa5d1bfd519f2748786b83","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iio/adc/ad_sigma_delta.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.19","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iio/adc/ad_sigma_delta.c"]}],"references":["https://git.kernel.org/stable/c/b2a991d33f1e2207052fe745d1fe459db8b365e2","https://git.kernel.org/stable/c/975b09bc680acc60903777b766cdb53b0bf9c9f6","https://git.kernel.org/stable/c/84500ae0d976995a6870cb1dca2d124b6b2d6e5a","https://git.kernel.org/stable/c/f20b94a7dc1ff9ade191ce839c984210fdbdc653","https://git.kernel.org/stable/c/5663c72bf400231e90777982216797191887a6b9","https://git.kernel.org/stable/c/9ee8306121495d2a25aa5d1bfd519f2748786b83"],"weaknesses":[],"ingestedAt":"2026-10-30T12:58:04.520Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98677.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98677","state":"PUBLISHED","datePublished":"2026-10-18T15:45:33.871Z","dateUpdated":"2026-10-30T12:38:40.900Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.363Z"},"containers":{"cna":{"title":"iio: adc: ad_sigma_delta: fix use-after-free on unbind","descriptions":[{"lang":"en","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->samples_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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8bea9af887de4c99a95f93f2ce400ef63e8b4e9b","status":"affected","lessThan":"b2a991d33f1e2207052fe745d1fe459db8b365e2","versionType":"git"},{"version":"8bea9af887de4c99a95f93f2ce400ef63e8b4e9b","status":"affected","lessThan":"975b09bc680acc60903777b766cdb53b0bf9c9f6","versionType":"git"},{"version":"8bea9af887de4c99a95f93f2ce400ef63e8b4e9b","status":"affected","lessThan":"84500ae0d976995a6870cb1dca2d124b6b2d6e5a","versionType":"git"},{"version":"8bea9af887de4c99a95f93f2ce400ef63e8b4e9b","status":"affected","lessThan":"f20b94a7dc1ff9ade191ce839c984210fdbdc653","versionType":"git"},{"version":"8bea9af887de4c99a95f93f2ce400ef63e8b4e9b","status":"affected","lessThan":"5663c72bf400231e90777982216797191887a6b9","versionType":"git"},{"version":"8bea9af887de4c99a95f93f2ce400ef63e8b4e9b","status":"affected","lessThan":"9ee8306121495d2a25aa5d1bfd519f2748786b83","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iio/adc/ad_sigma_delta.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.19","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iio/adc/ad_sigma_delta.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/b2a991d33f1e2207052fe745d1fe459db8b365e2"},{"url":"https://git.kernel.org/stable/c/975b09bc680acc60903777b766cdb53b0bf9c9f6"},{"url":"https://git.kernel.org/stable/c/84500ae0d976995a6870cb1dca2d124b6b2d6e5a"},{"url":"https://git.kernel.org/stable/c/f20b94a7dc1ff9ade191ce839c984210fdbdc653"},{"url":"https://git.kernel.org/stable/c/5663c72bf400231e90777982216797191887a6b9"},{"url":"https://git.kernel.org/stable/c/9ee8306121495d2a25aa5d1bfd519f2748786b83"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:38:40.900Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.12.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.18.56"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"7.2.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}