VulnerabilityPublished 18 Oct 2026

CVE-2026-98843: Linux kernel · netfs: zero gaps in read-gaps folio to avoid writing back stale data

Source GCVE Database

Authoritative record:CVE-2026-98843· Medium

Not known to be exploited · fixed in 512eaf01ffabf4258e945016b50df5aed940b705 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:05 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 512eaf01ffabf4258e945016b50df5aed940b705, 8db55c5cd831a786a1a2a2d391aa80354535a353, 2a62fe628a877c249c8286b157ee99d82840d9dc

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-3x6r-43qp-fxh7

What to do

Upgrade Linux kernel to 512eaf01ffabf4258e945016b50df5aed940b705, 8db55c5cd831a786a1a2a2d391aa80354535a353 or 2a62fe628a877c249c8286b157ee99d82840d9dc.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ ee4cdf7ba857a894ad1650d6ab77669cbbfa329e, < 512eaf01ffabf4258e945016b50df5aed940b705	Fixed in 512eaf01ffabf4258e945016b50df5aed940b705
LinuxLinux	Affected ≥ ee4cdf7ba857a894ad1650d6ab77669cbbfa329e, < 8db55c5cd831a786a1a2a2d391aa80354535a353	Fixed in 8db55c5cd831a786a1a2a2d391aa80354535a353
LinuxLinux	Affected ≥ ee4cdf7ba857a894ad1650d6ab77669cbbfa329e, < 2a62fe628a877c249c8286b157ee99d82840d9dc	Fixed in 2a62fe628a877c249c8286b157ee99d82840d9dc
LinuxLinux	Affected =6.12	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to address this issue by zeroing the gaps after the read completes rather than before. Users should apply the official kernel update that includes this fix. No additional mitigations are specified.

Description

A vulnerability in the Linux kernel's netfs component was resolved that involved stale data being written back due to gaps left unread on the server side during streaming writes. The flaw caused stale folio content to be written back after a short or EOF response. The fix involves zeroing these gaps after the read completes to prevent stale data from being written back.

References

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