CVE-2026-98091: Linux kernel · btrfs: detach failed sprout device from transaction update list
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 13:47 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 2% 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 properly detach the device from the transaction update list before releasing it, preventing the use-after-free condition. Users should update to the patched kernel versions listed by their distribution to remediate this issue.
Description
A vulnerability in the Linux kernel's btrfs filesystem handling was resolved. The issue occurs when creating the first metadata chunk for a sprout filesystem, where a device is added to a transaction update list but not properly detached if subsequent chunk creation fails. This leads to a warning and leaves the transaction list referencing freed memory, potentially causing instability.
References
- ubuntu.com/security/CVE-2026-98091 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-98091 (opens in a new tab)
- git.kernel.org/stable/c/e9e7e37afa85db770e6084360b21a21a8b3a583f (opens in a new tab)
- git.kernel.org/stable/c/c93b3c43df561cd9f592cee20ae058b563f9e5b6 (opens in a new tab)
- git.kernel.org/stable/c/8b001df2b37ca022f710f3254fbb0bcd6d9e1bed (opens in a new tab)
- git.kernel.org/stable/c/0ea6814bc0ff7cff443241bd34db9f0f828f3190 (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-98091 (opens in a new tab)
- git.kernel.org/stable/c/2a57fb1d5ce8f316b81bbb60e6df245ebc816ffc (opens in a new tab)
- git.kernel.org/stable/c/63bfa52eb3289517aa82cb90e1189385873aae21 (opens in a new tab)
- git.kernel.org/stable/c/7fe9dfbca43464baa8f050447a4837587b18adec (opens in a new tab)
- git.kernel.org/stable/c/86eff3052054e8f3b059b2d5845b6dcca021f20c (opens in a new tab)