VulnerabilityPublished 18 Oct 2026

CVE-2026-98647: Linux kernel · bpf: Fix divide-by-zero in btf_struct_walk()

Source GCVE Database

Authoritative record:CVE-2026-98647· High

Not known to be exploited · fixed in b8fa56722e9c43bcd59c51fe4c7edd5f4158a11b : patch Linux kernel soon.

Data as of 26 Oct 2026, 12:55 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 b8fa56722e9c43bcd59c51fe4c7edd5f4158a11b, b0b3dc66529676228cb938cbcad66920f735c223, 172756f02663ad45c889c001c1a8cb4082a01a05 +4

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-p98x-gg62-cxq2

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 9c5f8a1008a121e4c6b24af211034e24b0b63081, < b8fa56722e9c43bcd59c51fe4c7edd5f4158a11b	Fixed in b8fa56722e9c43bcd59c51fe4c7edd5f4158a11b
LinuxLinux	Affected ≥ 9c5f8a1008a121e4c6b24af211034e24b0b63081, < b0b3dc66529676228cb938cbcad66920f735c223	Fixed in b0b3dc66529676228cb938cbcad66920f735c223
LinuxLinux	Affected ≥ 9c5f8a1008a121e4c6b24af211034e24b0b63081, < 172756f02663ad45c889c001c1a8cb4082a01a05	Fixed in 172756f02663ad45c889c001c1a8cb4082a01a05
LinuxLinux	Affected ≥ 9c5f8a1008a121e4c6b24af211034e24b0b63081, < 934e9ba9f8d05656a48624710be67ca4dc8482e6	Fixed in 934e9ba9f8d05656a48624710be67ca4dc8482e6
LinuxLinux	Affected ≥ 9c5f8a1008a121e4c6b24af211034e24b0b63081, < 63af086cb5fa6f72fd924f86bea4c2194da663a2	Fixed in 63af086cb5fa6f72fd924f86bea4c2194da663a2
LinuxLinux	Affected ≥ 9c5f8a1008a121e4c6b24af211034e24b0b63081, < 8eb4cd72daad3a9ee63d2281bbdd16ce6d9406b1	Fixed in 8eb4cd72daad3a9ee63d2281bbdd16ce6d9406b1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix has been applied to reject zero-sized element types in btf_struct_walk(), preventing the divide-by-zero error. Users should update their Linux kernel to a version that includes this fix. Since no vendor advisory or patch links are provided, check the official Linux kernel release notes or security advisories for the fixed version and apply updates accordingly.

Description

A divide-by-zero vulnerability in the Linux kernel's bpf_struct_walk() function has been fixed. The issue occurs when accessing past a struct with a flexible array member whose element type has zero size, causing a divide-by-zero error at program load time. This flaw can trigger a kernel error and crash when loading certain BPF programs.

References

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