VulnerabilityPublished 18 Oct 2026

CVE-2026-98611: Linux kernel · bpf: Check params size before reading reserved fields

Source GCVE Database

Authoritative record:CVE-2026-98611· High

Not known to be exploited · fixed in e03253f5d65ebcd2a6d479f140c3bd9c7e4fb84a : 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 e03253f5d65ebcd2a6d479f140c3bd9c7e4fb84a, cd12d3e08620257fbcaa262785d7f4b9473afc7a, a11212910cf09b2fe8db9afa41ef60c4f81879c5 +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-3j3q-mxmx-xwq4

What to do

Upgrade Linux kernel to e03253f5d65ebcd2a6d479f140c3bd9c7e4fb84a, cd12d3e08620257fbcaa262785d7f4b9473afc7a, a11212910cf09b2fe8db9afa41ef60c4f81879c5 or 86a0e945fb645ea90233fde239cd2de79f01974c.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 3e1c6f35409f9e447bf37f64840f5b65576bfb78, < e03253f5d65ebcd2a6d479f140c3bd9c7e4fb84a	Fixed in e03253f5d65ebcd2a6d479f140c3bd9c7e4fb84a
LinuxLinux	Affected ≥ 3e1c6f35409f9e447bf37f64840f5b65576bfb78, < cd12d3e08620257fbcaa262785d7f4b9473afc7a	Fixed in cd12d3e08620257fbcaa262785d7f4b9473afc7a
LinuxLinux	Affected ≥ 3e1c6f35409f9e447bf37f64840f5b65576bfb78, < a11212910cf09b2fe8db9afa41ef60c4f81879c5	Fixed in a11212910cf09b2fe8db9afa41ef60c4f81879c5
LinuxLinux	Affected ≥ 3e1c6f35409f9e447bf37f64840f5b65576bfb78, < 86a0e945fb645ea90233fde239cd2de79f01974c	Fixed in 86a0e945fb645ea90233fde239cd2de79f01974c
LinuxLinux	Affected =6.10	Fixed in–

AI-suggested

A fix has been implemented that moves the parameter size check before reading reserved fields in bpf_crypto_ctx_create(). Users should apply the official kernel update containing this fix once available.

Description

A vulnerability in the Linux kernel's bpf_crypto_ctx_create() function allowed reading beyond the validated buffer size due to improper parameter size checking. This could lead to the kernel accessing memory outside the intended bounds. The issue was fixed by moving the size check before reading reserved fields.

References

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