VulnerabilityPublished 18 Oct 2026

CVE-2026-98613: Linux kernel · bpf: Bound ownership depth through local kptrs and graph roots

Source GCVE Database

Authoritative record:CVE-2026-98613· High

Not known to be exploited · fixed in bfc888f04588f591851e95c974954cfca58e6c19 : patch Linux kernel soon.

Data as of 26 Oct 2026, 17:16 UTC

Severity

High

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in bfc888f04588f591851e95c974954cfca58e6c19, 4105870a4b8afe852aeb24a6dd58e1836cc4ce58, 92aa0502c781d72bb9685245c3280efb3766a110 +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-32jf-h832-m29p

What to do

Upgrade Linux kernel to bfc888f04588f591851e95c974954cfca58e6c19, 4105870a4b8afe852aeb24a6dd58e1836cc4ce58, 92aa0502c781d72bb9685245c3280efb3766a110 or 9c11e543fec32e92b3aa3f693339ca3ee79ea9dd.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ b0966c724584a5a9fd7fb529de19807c31f27a45, < bfc888f04588f591851e95c974954cfca58e6c19	Fixed in bfc888f04588f591851e95c974954cfca58e6c19
LinuxLinux	Affected ≥ b0966c724584a5a9fd7fb529de19807c31f27a45, < 4105870a4b8afe852aeb24a6dd58e1836cc4ce58	Fixed in 4105870a4b8afe852aeb24a6dd58e1836cc4ce58
LinuxLinux	Affected ≥ b0966c724584a5a9fd7fb529de19807c31f27a45, < 92aa0502c781d72bb9685245c3280efb3766a110	Fixed in 92aa0502c781d72bb9685245c3280efb3766a110
LinuxLinux	Affected ≥ b0966c724584a5a9fd7fb529de19807c31f27a45, < 9c11e543fec32e92b3aa3f693339ca3ee79ea9dd	Fixed in 9c11e543fec32e92b3aa3f693339ca3ee79ea9dd
LinuxLinux	Affected =6.12	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel that bounds the ownership depth and rejects overly deep or cyclic ownership chains in BPF program-allocated objects. Users should apply the official kernel update that includes this fix. No additional mitigation is indicated or required beyond applying the patch.

Description

A vulnerability in the Linux kernel's BPF subsystem related to ownership depth through local kernel pointers (kptrs) and graph roots has been resolved. The issue allowed program-allocated objects to form arbitrarily deep chains via self-referential local kptrs, potentially exhausting the kernel stack during object destruction. The fix bounds the ownership walk depth to prevent such deep or cyclic chains, improving validation during BPF Type Format (BTF) load time.

References

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