VulnerabilityPublished 17 Sep 2026Updated 30 Oct 2026

CVE-2026-90259: Linux kernel · btrfs: qgroup: fix a wrong length calculation in qgroup_free_reserved_data()

Source GCVE Database

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Authoritative record:CVE-2026-90259

Not known to be exploited · fixed in e6edde29990af8064b9d12217ec03db231ccd55d : update Linux kernel when convenient.

Data as of 30 Oct 2026, 16:33 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in e6edde29990af8064b9d12217ec03db231ccd55d, c4c136555ff90f1e2921cc42da43daac0ef9985e, 9102b179512e11644fb0489ae62010a09afa199c +3

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-m2j4-9jh2-f83w

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ bc42bda22345efdb5d8b578d1b4df2c6eaa85c58, < e6edde29990af8064b9d12217ec03db231ccd55d	Fixed in e6edde29990af8064b9d12217ec03db231ccd55d
LinuxLinux	Affected ≥ bc42bda22345efdb5d8b578d1b4df2c6eaa85c58, < c4c136555ff90f1e2921cc42da43daac0ef9985e	Fixed in c4c136555ff90f1e2921cc42da43daac0ef9985e
LinuxLinux	Affected ≥ bc42bda22345efdb5d8b578d1b4df2c6eaa85c58, < 9102b179512e11644fb0489ae62010a09afa199c	Fixed in 9102b179512e11644fb0489ae62010a09afa199c
LinuxLinux	Affected ≥ bc42bda22345efdb5d8b578d1b4df2c6eaa85c58, < 202ac9e469b78817512921c5db05cc2140e4ca43	Fixed in 202ac9e469b78817512921c5db05cc2140e4ca43
LinuxLinux	Affected ≥ bc42bda22345efdb5d8b578d1b4df2c6eaa85c58, < 036e6c216be66a085da3a0519f1be5f3230b6e26	Fixed in 036e6c216be66a085da3a0519f1be5f3230b6e26
LinuxLinux	Affected ≥ bc42bda22345efdb5d8b578d1b4df2c6eaa85c58, < 34adc843c28e5cd1f533a1d64f51b0f756fdf945	Fixed in 34adc843c28e5cd1f533a1d64f51b0f756fdf945

Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: qgroup: fix a wrong length calculation in qgroup_free_reserved_data() In that function, we round down the start position and round up the ending position. But during the calculation of @len, we use "round_up(start + len, sectorsize)", which is the rounded up end position, not the rounded up length. Which results a much larger length, and later we are still using "start + len", which is completely incorrect. Fix it by declaring a local @aligned_start and @aligned_len and use them instead.

References

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