VulnerabilityPublished 18 Oct 2026

CVE-2026-98446: Linux kernel · xfs: don't let hidden_space go negative in xfs_metafile_resv_init

Source GCVE Database

Authoritative record:CVE-2026-98446· Medium

Not known to be exploited · fixed in f0d8352a39f4a2e329ae45b71bb0d49e2ca0a6dc : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in f0d8352a39f4a2e329ae45b71bb0d49e2ca0a6dc, 476582d754cdc5110f806001417fea6c77824c13, 930a9c1c321efdaa3e7f8caecb0479cee3baf342

Exploitation evidence

Disclosed: evidence found.
CVE published 18 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.

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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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-8r8r-jgjj-w55r

What to do

Upgrade Linux kernel to f0d8352a39f4a2e329ae45b71bb0d49e2ca0a6dc, 476582d754cdc5110f806001417fea6c77824c13 or 930a9c1c321efdaa3e7f8caecb0479cee3baf342.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 1df8d75030b787a9fae270b59b93eef809dd2011, < f0d8352a39f4a2e329ae45b71bb0d49e2ca0a6dc	Fixed in f0d8352a39f4a2e329ae45b71bb0d49e2ca0a6dc
LinuxLinux	Affected ≥ 1df8d75030b787a9fae270b59b93eef809dd2011, < 476582d754cdc5110f806001417fea6c77824c13	Fixed in 476582d754cdc5110f806001417fea6c77824c13
LinuxLinux	Affected ≥ 1df8d75030b787a9fae270b59b93eef809dd2011, < 930a9c1c321efdaa3e7f8caecb0479cee3baf342	Fixed in 930a9c1c321efdaa3e7f8caecb0479cee3baf342
LinuxLinux	Affected =6.15	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to correct the logic in xfs_metafile_resv_init, preventing the hidden_space variable from going negative. Users should update to the fixed kernel version once available. No additional mitigation steps are indicated.

Description

A vulnerability in the Linux kernel's XFS filesystem code could cause an integer underflow in the hidden_space calculation within xfs_metafile_resv_init. This occurs when the reserved fdblocks for a metadata btree file are less than the space already used, leading to a large incorrect subtraction in xfs_dec_fdblocks. The issue has been fixed by correcting the logic to prevent the target from being less than the used space.

References

Community reviews

Loading reviews…