VulnerabilityPublished 18 Oct 2026Updated 21 Oct 2026

CVE-2026-98677: Linux kernel · iio: adc: ad_sigma_delta: fix use-after-free on unbind

Source GCVE Database

Authoritative record:CVE-2026-98677

Not known to be exploited · fixed in f20b94a7dc1ff9ade191ce839c984210fdbdc653 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in f20b94a7dc1ff9ade191ce839c984210fdbdc653, 84500ae0d976995a6870cb1dca2d124b6b2d6e5a, 5663c72bf400231e90777982216797191887a6b9 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-852j-fqfh-mmqj

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 8bea9af887de4c99a95f93f2ce400ef63e8b4e9b, < f20b94a7dc1ff9ade191ce839c984210fdbdc653	Fixed in f20b94a7dc1ff9ade191ce839c984210fdbdc653
LinuxLinux	Affected ≥ 8bea9af887de4c99a95f93f2ce400ef63e8b4e9b, < 84500ae0d976995a6870cb1dca2d124b6b2d6e5a	Fixed in 84500ae0d976995a6870cb1dca2d124b6b2d6e5a
LinuxLinux	Affected ≥ 8bea9af887de4c99a95f93f2ce400ef63e8b4e9b, < 5663c72bf400231e90777982216797191887a6b9	Fixed in 5663c72bf400231e90777982216797191887a6b9
LinuxLinux	Affected ≥ 8bea9af887de4c99a95f93f2ce400ef63e8b4e9b, < 975b09bc680acc60903777b766cdb53b0bf9c9f6	Fixed in 975b09bc680acc60903777b766cdb53b0bf9c9f6
LinuxLinux	Affected ≥ 8bea9af887de4c99a95f93f2ce400ef63e8b4e9b, < 9ee8306121495d2a25aa5d1bfd519f2748786b83	Fixed in 9ee8306121495d2a25aa5d1bfd519f2748786b83
LinuxLinux	Affected =5.19	Fixed in–

AI-suggested

A fix is available that preallocates the buffer earlier in the driver lifecycle to prevent use-after-free. Users should update to the fixed Linux kernel version containing this patch once released. No alternative mitigations are indicated.

Description

A use-after-free vulnerability in the Linux kernel's iio adc ad_sigma_delta driver was resolved. The issue occurs because a buffer allocated at runtime is freed prematurely during device unbinding, while an interrupt handler can still access it, leading to potential memory corruption. The fix involves preallocating the buffer earlier so it is freed only after the interrupt handler is properly drained.

References

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