CVE-2026-98080: Linux kernel · btrfs: do not force reloc root creation during qgroup_account_snapshot()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in d0284d974be46a0a06068f930c84039d540ae8ed : update Linux kernel when convenient.
Data as of 26 Oct 2026, 14:05 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 2% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in d0284d974be46a0a06068f930c84039d540ae8ed, cacf35832292997018837e484283f95a9301ebf5, c4c78768d1a8ceb713693cc5524acbe984c31f3c +7
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
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in– |
AI-suggested
This vulnerability has been fixed in Linux kernel versions 4.15 and 4.17. Users should upgrade to these or later kernel versions to resolve the issue. No additional mitigation steps are required beyond applying the official fix.
Description
A vulnerability in the Linux kernel's Btrfs filesystem related to quota accounting can cause kernel warnings and force the filesystem into read-only mode. This occurs due to improper handling of reloc root creation during qgroup_account_snapshot(), leading to references to metadata extents that no longer exist. The issue has been fixed in Linux kernel versions 4.15 and 4.17.
References
- git.kernel.org/stable/c/d0284d974be46a0a06068f930c84039d540ae8ed (opens in a new tab)
- git.kernel.org/stable/c/21bd77c132f18dc21c6fcdf417310d1adcf7448b (opens in a new tab)
- git.kernel.org/stable/c/7ce02d52548b672795511c2cac8da6ec79ac8877 (opens in a new tab)
- git.kernel.org/stable/c/7caaae233a55e167063f4cfa3385b1a04c8bbecb (opens in a new tab)
- git.kernel.org/stable/c/c4c78768d1a8ceb713693cc5524acbe984c31f3c (opens in a new tab)
- git.kernel.org/stable/c/203cbfb4fba590bd9b08bd36fa6d05b5d28923bf (opens in a new tab)
- git.kernel.org/stable/c/b5d5ab5a715001dd937c920ef8c5688fd4999ba1 (opens in a new tab)
- git.kernel.org/stable/c/cacf35832292997018837e484283f95a9301ebf5 (opens in a new tab)