CVE-2026-98963: Linux kernel · btrfs: always return -EIOCBQUEUED after btrfs_uring_read_extent_endio
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 28 Oct 2026, 02:12 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Exploitation evidence
Disclosed: evidence found.
CVE published 23 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
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.10linuxpkg:deb/ubuntu/linux?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-oraclepkg:deb/ubuntu/linux-oracle?arch=source&distro=stonkingOther 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 always return -EIOCBQUEUED after btrfs_uring_read_extent_endio, preventing double cleanup. Users should update to a patched kernel version that includes this fix. No additional mitigation steps are indicated.
Description
A vulnerability in the Linux kernel's btrfs filesystem code related to the handling of I/O completion status has been resolved. The issue involved improper return values after the btrfs_uring_read_extent_endio function, which could cause double unlocking and freeing of resources. This was fixed by always returning -EIOCBQUEUED to ensure only the deferred cleanup path executes.
References
- ubuntu.com/security/CVE-2026-98963 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-98963 (opens in a new tab)
- git.kernel.org/stable/c/033dda5b321f01661de518a8d5c8607ae8675b14 (opens in a new tab)
- git.kernel.org/stable/c/80a8dbb30d2b00b9c671b02bd73f700f6d20100f (opens in a new tab)
- git.kernel.org/stable/c/a449433b0e3d4a3715d0bbee078f8c603f03c9f6 (opens in a new tab)