CVE-2026-98244: Linux kernel · btrfs: clear free space tree creation state on rebuild failure
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in b1df2997d0cd2be7bef7b4ab64ccfd1019dedc81 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 13:47 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 b1df2997d0cd2be7bef7b4ab64ccfd1019dedc81, a32bedab8ece9d1f90a1476a5b486a1804dc78ba, 3565893cc72cdf6b795cf6a33e7ff9605322334d
Exploitation evidence
Disclosed: evidence found.
CVE published 6 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 b1df2997d0cd2be7bef7b4ab64ccfd1019dedc81, a32bedab8ece9d1f90a1476a5b486a1804dc78ba or 3565893cc72cdf6b795cf6a33e7ff9605322334d.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A fix is available in the specified Linux kernel commits. Users should update to a kernel version that includes these fixes to ensure the flag is properly cleared on rebuild failure and to maintain filesystem integrity.
Description
A vulnerability in the Linux kernel's btrfs filesystem involves improper clearing of a flag during free space tree rebuild failure. This can cause delayed reference processing to be skipped on a live filesystem, potentially affecting filesystem integrity. The issue is fixed in specific commits.