CVE-2025-68791: Linux kernel · fuse: missing copy_finish in fuse-over-io-uring argument copies
Affects Linux kernelSource GCVE Database
Not known to be exploited · fixed in 6.17.0-1012.12~24.04.1 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 17:16 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 8% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 6.17.0-1012.12~24.04.1, 6.17.0-1013.13~24.04.1, 6.17.0-22.22~24.04.1 +11
Exploitation evidence
Disclosed: evidence found.
CVE published 13 Jan 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 to a fixed release listed under Affected software.
Patches and advisories
- ubuntu.com/security/notices/USN-8177-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8177-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8183-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8183-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8245-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8257-1 (opens in a new tab)
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 25.10linuxpkg:deb/ubuntu/linux?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=questingOther threats | Affected
| Fixed in– |
Ubuntu 25.10linux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-oraclepkg:deb/ubuntu/linux-oracle?arch=source&distro=questingOther 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 patch is available and included in Linux kernel version 6.17.0-1018.18 and later, as well as corresponding Ubuntu package updates. Users should apply the standard system update and reboot to ensure the fix is active. Due to an ABI change in the kernel update, recompilation and reinstallation of all third-party kernel modules are necessary. If standard kernel metapackages are installed, the system upgrade will handle this automatically.
Description
A vulnerability in the Linux kernel's FUSE (File system in Userspace) subsystem was fixed, addressing a missing copy_finish call in fuse-over-io-uring argument copies. This flaw could cause a reference count leak of payload pages during argument copying. The issue has been resolved in Linux kernel versions 6.17.0-1018.18 and later. The fix is available and included in Ubuntu security updates. Users should update and reboot to apply the patch. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required.
References
- ubuntu.com/security/CVE-2025-68791 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2025-68791 (opens in a new tab)
- git.kernel.org/linus/6e0d7f7f4a43ac8868e98c87ecf48805aa8c24dd (opens in a new tab)
- git.kernel.org/stable/c/6e0d7f7f4a43ac8868e98c87ecf48805aa8c24dd (opens in a new tab)
- git.kernel.org/stable/c/b79938863f436960eff209130f025c4bd3026bf8 (opens in a new tab)
- ubuntu.com/security/notices/USN-8177-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8177-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8183-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8183-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8245-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8257-1 (opens in a new tab)