CVE-2026-98677
iio: adc: ad_sigma_delta: fix use-after-free on unbind
- Published
- Updated
- Reserved
- Assigned by
- Linux
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.
Timeline
ID reserved
By Linux
- 23 days later
· 23 days later
Published
- 12 days later
· 12 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.21% · top 89% of all CVEs (8 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 8bea9af887de4c99a95f93f2ce400ef63e8b4e9b – < b2a991d33f1e2207052fe745d1fe459db8b365e2
- affected 8bea9af887de4c99a95f93f2ce400ef63e8b4e9b – < 975b09bc680acc60903777b766cdb53b0bf9c9f6
- affected 8bea9af887de4c99a95f93f2ce400ef63e8b4e9b – < 84500ae0d976995a6870cb1dca2d124b6b2d6e5a
- affected 8bea9af887de4c99a95f93f2ce400ef63e8b4e9b – < f20b94a7dc1ff9ade191ce839c984210fdbdc653
- affected 8bea9af887de4c99a95f93f2ce400ef63e8b4e9b – < 5663c72bf400231e90777982216797191887a6b9
- affected 8bea9af887de4c99a95f93f2ce400ef63e8b4e9b – < 9ee8306121495d2a25aa5d1bfd519f2748786b83
- affected 5.19
- unaffected < 5.19
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.160 – ≤ 6.6.*
- unaffected 6.12.113 – ≤ 6.12.*
- unaffected 6.18.56 – ≤ 6.18.*
- unaffected 7.2.10 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References (6)
- https://git.kernel.org/stable/c/b2a991d33f1e2207052fe745d1fe459db8b365e2 (opens in a new tab)
- https://git.kernel.org/stable/c/975b09bc680acc60903777b766cdb53b0bf9c9f6 (opens in a new tab)
- https://git.kernel.org/stable/c/84500ae0d976995a6870cb1dca2d124b6b2d6e5a (opens in a new tab)
- https://git.kernel.org/stable/c/f20b94a7dc1ff9ade191ce839c984210fdbdc653 (opens in a new tab)
- https://git.kernel.org/stable/c/5663c72bf400231e90777982216797191887a6b9 (opens in a new tab)
- https://git.kernel.org/stable/c/9ee8306121495d2a25aa5d1bfd519f2748786b83 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-98677)Record last updated .