VulnerabilityPublished 18 Oct 2026

CVE-2026-98826: Linux kernel · rtc: ac100: Fix clock provider use-after-free on probe failure

Source GCVE Database

Authoritative record:CVE-2026-98826· Medium

Not known to be exploited · fixed in fcf0b58e976e83adf246b014518e49c662b96f5e : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 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 fcf0b58e976e83adf246b014518e49c662b96f5e, 55ca60ba336632349f7c4585d22ba74ae355b7ce, 12bcd20d76703ee2baf52224d287b7fea096b12f +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-vm74-3mf5-j459

What to do

Upgrade Linux kernel to fcf0b58e976e83adf246b014518e49c662b96f5e, 55ca60ba336632349f7c4585d22ba74ae355b7ce, 12bcd20d76703ee2baf52224d287b7fea096b12f or 9cff19ddd7f90c1f572a0f83cfc41de8f8dcbcd8.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ d00a18a42c1483924de086ddfb0efe8da1dba3ac, < fcf0b58e976e83adf246b014518e49c662b96f5e	Fixed in fcf0b58e976e83adf246b014518e49c662b96f5e
LinuxLinux	Affected ≥ d00a18a42c1483924de086ddfb0efe8da1dba3ac, < 55ca60ba336632349f7c4585d22ba74ae355b7ce	Fixed in 55ca60ba336632349f7c4585d22ba74ae355b7ce
LinuxLinux	Affected ≥ d00a18a42c1483924de086ddfb0efe8da1dba3ac, < 12bcd20d76703ee2baf52224d287b7fea096b12f	Fixed in 12bcd20d76703ee2baf52224d287b7fea096b12f
LinuxLinux	Affected ≥ d00a18a42c1483924de086ddfb0efe8da1dba3ac, < 9cff19ddd7f90c1f572a0f83cfc41de8f8dcbcd8	Fixed in 9cff19ddd7f90c1f572a0f83cfc41de8f8dcbcd8
LinuxLinux	Affected =4.9	Fixed in–

AI-suggested

A fix is available that changes the clock registration functions to device-managed variants, ensuring proper cleanup on probe failure and device removal. Users should update to a Linux kernel version that includes this fix. No additional mitigation is required as the fix addresses the root cause.

Description

A use-after-free vulnerability in the Linux kernel's ac100 RTC clock provider was fixed. The issue occurs when the probe function fails after registering clocks that are not device-managed, leaving dangling pointers in the global clock provider list. This can cause later lookups to access freed memory, leading to potential instability or crashes. The fix ensures proper device-managed registration and cleanup on probe failure.

References

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