iio: adc: ad_sigma_delta: fix use-after-free on unbind
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.
CVE-2026-98677
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-98677
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "8bea9af887de4c99a95f93f2ce400ef63e8b4e9b",
"lessThan": "975b09bc680acc60903777b766cdb53b0bf9c9f6",
"versionType": "git"
},
{
"status": "affected",
"version": "8bea9af887de4c99a95f93f2ce400ef63e8b4e9b",
"lessThan": "84500ae0d976995a6870cb1dca2d124b6b2d6e5a",
"versionType": "git"
},
{
"status": "affected",
"version": "8bea9af887de4c99a95f93f2ce400ef63e8b4e9b",
"lessThan": "f20b94a7dc1ff9ade191ce839c984210fdbdc653",
"versionType": "git"
},
{
"status": "affected",
"version": "8bea9af887de4c99a95f93f2ce400ef63e8b4e9b",
"lessThan": "5663c72bf400231e90777982216797191887a6b9",
"versionType": "git"
},
{
"status": "affected",
"version": "8bea9af887de4c99a95f93f2ce400ef63e8b4e9b",
"lessThan": "9ee8306121495d2a25aa5d1bfd519f2748786b83",
"versionType": "git"
}
],
"programFiles": [
"drivers/iio/adc/ad_sigma_delta.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.19",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.56",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.10",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/iio/adc/ad_sigma_delta.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98677
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48903 · Revision 1
- Added to Heist Feed
- Publisher date