VulnerabilityPublished 18 Oct 2026

CVE-2026-98641: Linux kernel · bpf, arm64: set up the frame pointer for the exception callback

Source GCVE Database

Authoritative record:CVE-2026-98641· High

Not known to be exploited · fixed in ef1fb82f12186dd26153b14d9fbcf4ec98db81b3 : patch Linux kernel soon.

Data as of 26 Oct 2026, 13:47 UTC

Severity

High

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 ef1fb82f12186dd26153b14d9fbcf4ec98db81b3, ecdd770a9fc3eaf6c3127c5991312b84774a7b0f, d7cd5ebe13989f265015910faa25e5d50faa4c22 +1

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-rmw7-mmh2-5m8g

What to do

Upgrade Linux kernel to ef1fb82f12186dd26153b14d9fbcf4ec98db81b3, ecdd770a9fc3eaf6c3127c5991312b84774a7b0f, d7cd5ebe13989f265015910faa25e5d50faa4c22 or b67b4c763f211e7a6391c356fef552e2ea63f08a.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 5d4fa9ec5643a5c75d3c1e6abf50fb9284caf1ff, < ef1fb82f12186dd26153b14d9fbcf4ec98db81b3	Fixed in ef1fb82f12186dd26153b14d9fbcf4ec98db81b3
LinuxLinux	Affected ≥ 5d4fa9ec5643a5c75d3c1e6abf50fb9284caf1ff, < ecdd770a9fc3eaf6c3127c5991312b84774a7b0f	Fixed in ecdd770a9fc3eaf6c3127c5991312b84774a7b0f
LinuxLinux	Affected ≥ 5d4fa9ec5643a5c75d3c1e6abf50fb9284caf1ff, < d7cd5ebe13989f265015910faa25e5d50faa4c22	Fixed in d7cd5ebe13989f265015910faa25e5d50faa4c22
LinuxLinux	Affected ≥ 5d4fa9ec5643a5c75d3c1e6abf50fb9284caf1ff, < b67b4c763f211e7a6391c356fef552e2ea63f08a	Fixed in b67b4c763f211e7a6391c356fef552e2ea63f08a
LinuxLinux	Affected =6.12	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to set the frame pointer correctly on the exception callback path for arm64 BPF programs. Users should apply the official kernel updates that include this patch to remediate the vulnerability. No additional mitigation steps are indicated.

Description

A vulnerability in the Linux kernel's BPF subsystem on arm64 architecture was resolved by properly setting the frame pointer for the exception callback. The flaw caused the callback prologue to omit setting the frame pointer register, leading to potential use of stale stack frame pointers from subprograms that never return. This could allow a helper function to overwrite its own return address, potentially causing a kernel panic or fatal exception. The fix ensures the frame pointer register is correctly set on the exception callback path, preventing this unsafe condition.

References

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