VulnerabilityPublished 18 Oct 2026

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

Affects Linux kernelSource CVE Database V5

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

Data as of 26 Oct 2026, 17:16 UTC

Severity

High

Rated High 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 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.

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 is available in the Linux kernel source code after version 6.14, as indicated by the fixed commit hashes. Users and administrators should update their Linux kernel to a version including these fixes to remediate the issue.

Description

A vulnerability in the Linux kernel's XFS filesystem component involves an out-of-bounds memory copy during the formatting of on-disk rtrefcount btree roots. The flaw occurs because the inode btree root formatting methods copy more bytes than necessary, leading to memory corruption beyond the intended buffer boundaries. This issue affects Linux kernel version 6.14 and has been fixed in subsequent commits.

Impact

The vulnerability causes memory corruption in kernel space due to an out-of-bounds memcpy operation. This could potentially lead to system instability or crashes. No information about exploitation in the wild or privilege escalation is provided.

Summary

CVE-2026-98447 addresses a memory corruption vulnerability in the Linux kernel's XFS filesystem. The problem arises from the inode btree root formatting methods copying too many bytes when formatting on-disk rtrefcount btree roots. Specifically, the code incorrectly assumes there are two sets of keys in node blocks instead of one, causing a wild memcpy access that corrupts memory beyond the allocated buffers. This flaw was identified and resolved in patches following version 6.14.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 11:18 UTC

Technical details

References

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