VulnerabilityPublished 25 Sep 2026Updated 21 Oct 2026

CVE-2026-98019: Linux kernel · bpf: mark a NULL call argument precise

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in febbb66e682d8328f7c5bcbdd5e4291abab2e858 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:07 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in febbb66e682d8328f7c5bcbdd5e4291abab2e858, b1fe6379e401b8ce0f561cb4d84af2b70b4343c3, 627089c278df58749f25686c6a3caf7e181b5951 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 25 Sep 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.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ b5dc0163d8fd78e64a7e21f309cf932fda34353e, < febbb66e682d8328f7c5bcbdd5e4291abab2e858	Fixed in febbb66e682d8328f7c5bcbdd5e4291abab2e858
LinuxLinux	Affected ≥ b5dc0163d8fd78e64a7e21f309cf932fda34353e, < b1fe6379e401b8ce0f561cb4d84af2b70b4343c3	Fixed in b1fe6379e401b8ce0f561cb4d84af2b70b4343c3
LinuxLinux	Affected ≥ b5dc0163d8fd78e64a7e21f309cf932fda34353e, < 627089c278df58749f25686c6a3caf7e181b5951	Fixed in 627089c278df58749f25686c6a3caf7e181b5951
LinuxLinux	Affected ≥ b5dc0163d8fd78e64a7e21f309cf932fda34353e, < 69a9ad004ccf5d45e534c7d503f47f643abe64b7	Fixed in 69a9ad004ccf5d45e534c7d503f47f643abe64b7
LinuxLinux	Affected ≥ b5dc0163d8fd78e64a7e21f309cf932fda34353e, < 1a3a10b030c96ea88868ccc060a16827c01eaa5a	Fixed in 1a3a10b030c96ea88868ccc060a16827c01eaa5a
LinuxLinux	Affected =5.3	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: mark a NULL call argument precise check_func_arg() allows bpf_register_is_null() for nullable arguments w/o marking the underlying scalar register precise. Hence a checkpoint created on such a path would prune against arbitrary scalar value. check_helper_call() enforces second parameter of the bpf_get_local_storage() to be zero, w/o marking the underlying scalar register precise. Hence a checkpoint created on such a path would prune against arbitrary scalar value. Grouping these two into one patch, as they share the same fixes tag.

References

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