VulnerabilityPublished 23 Oct 2026

CVE-2026-98888: Linux kernel · arm64: kprobes: Allow reentering kprobes while single-stepping

Source GCVE Database

Authoritative record:CVE-2026-98888· Medium

Not known to be exploited · fixed in f96a0606de6bcc8d937b80e6470fd7a174c17e26 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:05 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 8% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in f96a0606de6bcc8d937b80e6470fd7a174c17e26, c8e84e292ed4cfc199824146da71bb4397b02a1f, bb0fe9121aa0824211aafa33c7d0151fd25ddb75 +4

Exploitation evidence

Disclosed: evidence found.
CVE published 23 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-g4px-h95h-7mgm

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 2dd0e8d2d2a157dbc83295a78336c2217110f2f8, < f96a0606de6bcc8d937b80e6470fd7a174c17e26	Fixed in f96a0606de6bcc8d937b80e6470fd7a174c17e26
LinuxLinux	Affected ≥ 2dd0e8d2d2a157dbc83295a78336c2217110f2f8, < c8e84e292ed4cfc199824146da71bb4397b02a1f	Fixed in c8e84e292ed4cfc199824146da71bb4397b02a1f
LinuxLinux	Affected ≥ 2dd0e8d2d2a157dbc83295a78336c2217110f2f8, < bb0fe9121aa0824211aafa33c7d0151fd25ddb75	Fixed in bb0fe9121aa0824211aafa33c7d0151fd25ddb75
LinuxLinux	Affected ≥ 2dd0e8d2d2a157dbc83295a78336c2217110f2f8, < a21bf9cb893126e8d9730995708d0be5eb167652	Fixed in a21bf9cb893126e8d9730995708d0be5eb167652
LinuxLinux	Affected ≥ 2dd0e8d2d2a157dbc83295a78336c2217110f2f8, < 68774caca799e9695db56d426c69acebd041c2ed	Fixed in 68774caca799e9695db56d426c69acebd041c2ed
LinuxLinux	Affected ≥ 2dd0e8d2d2a157dbc83295a78336c2217110f2f8, < 23f851ac0078a908bf3422d6467ebc1db5828c46	Fixed in 23f851ac0078a908bf3422d6467ebc1db5828c46

AI-suggested

A fix has been implemented in the Linux kernel to correctly handle reentered kprobes during single-stepping on arm64 architectures and preserve interrupt state across nested kprobes. Users should update to the fixed kernel version once it is released. No additional mitigation is required beyond applying the official kernel patch when available.

Description

A vulnerability in the Linux kernel arm64 kprobes subsystem allowed improper handling of reentered kprobes during single-stepping, potentially causing incorrect interrupt state handling. The issue was that a kprobe hit in the KPROBE_HIT_SS state was treated as unrecoverable, leading to permanent interrupt disablement in some cases. This has been fixed by allowing reentry in KPROBE_HIT_SS to be handled correctly and preserving the interrupt state across nested kprobes.

Impact

Without this fix, nested kprobes during single-stepping could lead to incorrect handling of interrupt flags, potentially leaving interrupts permanently disabled on arm64 systems. This could cause system instability or degraded performance due to disabled interrupts. The vulnerability affects the kernel's internal debugging and tracing mechanisms but does not directly expose a remote attack vector or privilege escalation.

References

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