VulnerabilityPublished 18 Oct 2026

CVE-2026-98528: Linux kernel · gpio: cdev: fix kernel stack leak to user-space in error path

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in cf3d043582e106a0e57002bec8a6de8929ba3e1c : update Linux kernel when convenient.

Data as of 26 Oct 2026, 12:55 UTC

Severity

Low

Rated Low by Threat Radar's AI analysis · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in cf3d043582e106a0e57002bec8a6de8929ba3e1c, 8460ee5216ab9a38263b01dca4b0a27e083f70f3, 60a466f231905cd96ae6f0f3c44a710c97873dac +1

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.

What to do

Upgrade Linux kernel to cf3d043582e106a0e57002bec8a6de8929ba3e1c, 8460ee5216ab9a38263b01dca4b0a27e083f70f3, 60a466f231905cd96ae6f0f3c44a710c97873dac or 1feb5d39b05afd902ed9fc902ec5b15be03a4bdb.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ d83cee3d2bb131c7fca7e19f1e33dc7530fd7083, < cf3d043582e106a0e57002bec8a6de8929ba3e1c	Fixed in cf3d043582e106a0e57002bec8a6de8929ba3e1c
LinuxLinux	Affected ≥ d83cee3d2bb131c7fca7e19f1e33dc7530fd7083, < 8460ee5216ab9a38263b01dca4b0a27e083f70f3	Fixed in 8460ee5216ab9a38263b01dca4b0a27e083f70f3
LinuxLinux	Affected ≥ d83cee3d2bb131c7fca7e19f1e33dc7530fd7083, < 60a466f231905cd96ae6f0f3c44a710c97873dac	Fixed in 60a466f231905cd96ae6f0f3c44a710c97873dac
LinuxLinux	Affected ≥ d83cee3d2bb131c7fca7e19f1e33dc7530fd7083, < 1feb5d39b05afd902ed9fc902ec5b15be03a4bdb	Fixed in 1feb5d39b05afd902ed9fc902ec5b15be03a4bdb
LinuxLinux	Affected =6.9	Fixed in–
Red Hatredhat/kernel`pkg:rpm/redhat/kernel`Other threats	Affected =6.9	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

This vulnerability has been fixed in the Linux kernel. Users and administrators should update to the fixed versions identified by the commits cf3d043582e106a0e57002bec8a6de8929ba3e1c, 8460ee5216ab9a38263b01dca4b0a27e083f70f3, 60a466f231905cd96ae6f0f3c44a710c97873dac, and 1feb5d39b05afd902ed9fc902ec5b15be03a4bdb. No additional mitigation is required beyond applying these patches.

Description

A vulnerability in the Linux kernel's GPIO character device interface could leak kernel stack contents to user-space in an error path. This occurs when the GPIO chip guard acquisition fails, and the info struct passed to user-space is not properly zeroed, potentially exposing sensitive kernel memory data. The issue has been fixed by changing the function to return an error code and ensuring the info struct is zeroed before use.

Impact

The vulnerability may allow unintentional disclosure of kernel stack memory contents to user-space processes, potentially exposing sensitive information. There is no indication of active exploitation in the wild. The impact is limited to information leakage via the gpio cdev interface error path.

Summary

CVE-2026-98528 addresses a kernel stack leak vulnerability in the Linux kernel's gpio cdev subsystem. Specifically, if gpio_desc_to_lineinfo() fails to acquire the GPIO chip guard, it returns early without zeroing the info struct that is later passed to user-space via lineinfo_get_v1(). This can lead to leakage of kernel stack contents to user-space. The fix involves modifying gpio_desc_to_lineinfo() to return an int error code (-ENODEV) on failure, propagating this error to callers, and moving the memset() call to zero the info struct before attempting to acquire the SRCU read lock, preventing uninitialized data leakage.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 10:53 UTC

Technical details

References

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