VulnerabilityPublished 18 Oct 2026

CVE-2026-98447: Linux kernel · xfs: fix wild memcpy access when formatting ondisk rtrefcount btree roots

Source GCVE Database

Authoritative record:CVE-2026-98447· High

Not known to be exploited · fixed in fe2f9135df43db849e74f03956d322ac20b59af7 : patch Linux kernel soon.

Data as of 26 Oct 2026, 14:05 UTC

Severity

High

Rated by Threat Radar · 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 fe2f9135df43db849e74f03956d322ac20b59af7, d46492fb8018d12d00651b06b9d240e747110b38, 2703b954d306ebfe3b11e33e259759329c11b690

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-wj43-8f87-c9v3

What to do

Upgrade Linux kernel to fe2f9135df43db849e74f03956d322ac20b59af7, d46492fb8018d12d00651b06b9d240e747110b38 or 2703b954d306ebfe3b11e33e259759329c11b690.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ f0415af60f482a2192065be8b334b409495ca8a3, < fe2f9135df43db849e74f03956d322ac20b59af7	Fixed in fe2f9135df43db849e74f03956d322ac20b59af7
LinuxLinux	Affected ≥ f0415af60f482a2192065be8b334b409495ca8a3, < d46492fb8018d12d00651b06b9d240e747110b38	Fixed in d46492fb8018d12d00651b06b9d240e747110b38
LinuxLinux	Affected ≥ f0415af60f482a2192065be8b334b409495ca8a3, < 2703b954d306ebfe3b11e33e259759329c11b690	Fixed in 2703b954d306ebfe3b11e33e259759329c11b690
LinuxLinux	Affected =6.14	Fixed in–

AI-suggested

A fix for this vulnerability has been implemented in the Linux kernel. Users should update to the fixed kernel version once available from their distribution or vendor. Since this is a kernel-level issue, applying the official patch or upgrading the kernel is the recommended remediation.

Description

A vulnerability in the Linux kernel's XFS filesystem was fixed that involved improper memory copying when formatting on-disk rtrefcount btree roots. The issue caused memory corruption due to copying too many bytes in inode btree root formatting methods.

References

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