VulnerabilityPublished 18 Oct 2026

CVE-2026-98599: Linux kernel · bpf: Reject non-negative offsets in stack_slot_obj_get_spi()

Source GCVE Database

Authoritative record:CVE-2026-98599· Medium

Not known to be exploited : upgrade to 89a7241fc7ecc1b5e47c3f071081e314523b8d9d or 79a9172f3ab4ad8392c5e5c8944b9b7710ade620 when convenient.

Data as of 26 Oct 2026, 13:47 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 89a7241fc7ecc1b5e47c3f071081e314523b8d9d, 79a9172f3ab4ad8392c5e5c8944b9b7710ade620

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-6688-ppfm-xwh9

What to do

Upgrade Linux kernel to 89a7241fc7ecc1b5e47c3f071081e314523b8d9d or 79a9172f3ab4ad8392c5e5c8944b9b7710ade620.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 06accc8779c1d558a5b5a21f2ac82b0c95827ddd, < 89a7241fc7ecc1b5e47c3f071081e314523b8d9d	Fixed in 89a7241fc7ecc1b5e47c3f071081e314523b8d9d
LinuxLinux	Affected ≥ 06accc8779c1d558a5b5a21f2ac82b0c95827ddd, < 79a9172f3ab4ad8392c5e5c8944b9b7710ade620	Fixed in 79a9172f3ab4ad8392c5e5c8944b9b7710ade620
LinuxLinux	Affected =6.4	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to reject non-negative offsets in stack_slot_obj_get_spi(). Users should update to the fixed kernel version once available.

Description

A vulnerability in the Linux kernel's BPF subsystem allowed non-negative offsets in stack_slot_obj_get_spi(), which could cause incorrect validation of pointers referencing the BPF stack. This flaw could enable a kernel function to interpret memory outside the BPF stack as iterator state, potentially leading to unintended behavior. The issue has been resolved by rejecting non-negative offsets before converting them to stack pointer indices.

References

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