VulnerabilityPublished 18 Oct 2026Updated 21 Oct 2026

CVE-2026-98745: Linux kernel · arm64/fpsimd: signal: Forbid non-streaming SVE payload on SME-only systems

Source GCVE Database

Authoritative record:CVE-2026-98745

Not known to be exploited · fixed in f2338929c7663859c0c74dd6fef2c0245066f845 : 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 f2338929c7663859c0c74dd6fef2c0245066f845, e060d9069b49fe55f38057dfe592068014652671, 88c1c611552b24658eb61244086691c02be2013b +3

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-75wv-m6h4-9m7c

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected >=6.1.7 <6.2	Fixed in f2338929c7663859c0c74dd6fef2c0245066f845 e060d9069b49fe55f38057dfe592068014652671 88c1c611552b24658eb61244086691c02be2013b 052acee9880114879b5c221fc8dad69b786d0938 6.2 2bce6f006cfe0b60e8249fd8d51396d99355cba3
LinuxLinux	Affected =6.2	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to properly reject invalid SVE signal contexts on SME-only systems. Users should update to a kernel version that includes this fix. Since no vendor advisory or patch links are provided, check the official Linux kernel release notes or vendor advisories for the exact fixed versions and apply the update accordingly.

Description

A vulnerability in the Linux kernel arm64/fpsimd signal handling was resolved that could cause a task to erroneously have non-streaming SVE state on SME-only systems. This improper state restoration can lead to fatal undefined instruction exceptions (EL1 UNDEF) during kernel operations. The issue arises when the kernel restores a crafted SVE signal context with inconsistent flags and payload presence, causing kernel crashes.

References

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