CVE-2026-97610: Linux kernel · netfs: Fix uninitialized return value in netfs_unbuffered_write()
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 12:30 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 25 Sep 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
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| 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 initialize the return value properly in netfs_unbuffered_write(). Users should apply the official kernel updates that include this patch to resolve the issue.
Description
A vulnerability in the Linux kernel's netfs component was fixed where an uninitialized return value in netfs_unbuffered_write() could cause incorrect error reporting during synchronous writes. This occurs if preparation of the first subrequest fails, such as through CIFS when cifs_prepare_write() fails to reopen the file or obtain credits. The fix initializes the return value to ensure the caller receives the correct error or byte count.
References
- ubuntu.com/security/CVE-2026-97610 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-97610 (opens in a new tab)
- git.kernel.org/stable/c/f18e8774f4d3137fa0a5fb8ffa83d59a719666d8 (opens in a new tab)
- git.kernel.org/stable/c/3d038eebdbd400c3bc4b66bd8aa0dff0c2bcce26 (opens in a new tab)
- git.kernel.org/stable/c/2e38d500471d097cda87d7d374bbc1b13493075d (opens in a new tab)