CVE-2026-98843: Linux kernel · netfs: zero gaps in read-gaps folio to avoid writing back stale data
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in 512eaf01ffabf4258e945016b50df5aed940b705 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 14:05 UTC
Rated Medium by Threat Radar's AI analysis · 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.
What to do
Upgrade Linux kernel to 512eaf01ffabf4258e945016b50df5aed940b705, 8db55c5cd831a786a1a2a2d391aa80354535a353 or 2a62fe628a877c249c8286b157ee99d82840d9dc.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A fix has been implemented in the Linux kernel as indicated by the presence of fixed commit versions. Users should update to the fixed versions to remediate this vulnerability. No additional mitigation steps are specified or required beyond applying the official fix.
Description
A vulnerability in the Linux kernel's netfs subsystem could cause stale data to be written back due to gaps left unread on the server side during streaming writes. The issue arises because netfs_read_gaps() leaves gaps around a dirty region that are not properly zeroed after a short or EOF response, potentially resulting in stale folio content being written back. The fix involves zeroing these gaps after the read completes to prevent stale data from persisting.