VulnerabilityPublished 18 Oct 2026

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

Source GCVE Database

Authoritative record:CVE-2026-98528· Low

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 by Threat Radar · 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.

ghsa-2259-3wph-4x6g

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

A fix has been implemented in the Linux kernel to address this vulnerability. Users should apply the official kernel updates that include this patch. Since this is a kernel-level fix, upgrading to a patched kernel version is the recommended remediation.

Description

A vulnerability in the Linux kernel's GPIO character device interface could cause kernel stack data to leak to user-space in an error path. This occurs when the function gpio_desc_to_lineinfo() fails to acquire a GPIO chip guard and returns early without zeroing a data structure passed to user-space. The issue has been resolved by ensuring the structure is zeroed before use and by propagating error codes properly.

Impact

The vulnerability could lead to unintended disclosure of kernel stack contents to user-space processes, potentially exposing sensitive kernel memory data. There is no indication of active exploitation in the wild. The impact is primarily an information leak from kernel to user-space.

Summary

The Linux kernel contained a vulnerability in the gpio: cdev component where, if gpio_desc_to_lineinfo() failed to acquire the GPIO chip guard, it would return immediately without zeroing the info struct. This struct is later passed to user-space in lineinfo_get_v1(), potentially leaking kernel stack contents. The fix involved changing gpio_desc_to_lineinfo() to return an int error code (-ENODEV) on failure and zeroing the info struct before attempting to acquire the SRCU read lock, preventing kernel stack leakage.

References

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