# CVE-2025-68742

## Summary

- **CVE ID:** CVE-2025-68742
- **Severity:** UNKNOWN
- **CVSS Score:** 1.51
- **CWE:** N/A
- **Published:** Dec 24, 2025
- **Last Modified:** Sep 17, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:

bpf: Fix invalid prog->stats access when update_effective_progs fails

Syzkaller triggers an invalid memory access issue following fault
injection in update_effective_progs. The issue can be described as
follows:

__cgroup_bpf_detach
  update_effective_progs
    compute_effective_progs
      bpf_prog_array_alloc <-- fault inject
  purge_effective_progs
    /* change to dummy_bpf_prog */
    array->items[index] = &dummy_bpf_prog.prog

---softirq start---
__do_softirq
  ...
    __cgroup_bpf_run_filter_skb
      __bpf_prog_run_save_cb
        bpf_prog_run
          stats = this_cpu_ptr(prog->stats)
          /* invalid memory access */
          flags = u64_stats_update_begin_irqsave(&stats->syncp)
---softirq end---

  static_branch_dec(&cgroup_bpf_enabled_key[atype])

The reason is that fault injection caused update_effective_progs to fail
and then changed the original prog into dummy_bpf_prog.prog in
purge_effective_progs. Then a softirq came, and accessing the members of
dummy_bpf_prog.prog in the softirq triggers invalid mem access.

To fix it, skip updating stats when stats is NULL.

## Affected Products

- Linux — Linux (492ecee892c2a4ba6a14903d5d586ff750b7e805)
- Linux — Linux (5.1)
- Linux — Linux (0)
- Linux — Linux (6.1.160)
- Linux — Linux (6.6.120)
- Linux — Linux (6.12.63)
- Linux — Linux (6.17.13)
- Linux — Linux (6.18.2)
- Linux — Linux (6.19)

## References

- [CNA](https://git.kernel.org/stable/c/93d1964773ff513c9bd530f7686d3e48b786fa6b)
- [CNA](https://git.kernel.org/stable/c/bf2c990b012100610c0f1ec5c4ea434da2d080c2)
- [CNA](https://git.kernel.org/stable/c/539137e3038ce6f953efd72110110f03c14c7d97)
- [CNA](https://git.kernel.org/stable/c/56905bb70c8b88421709bb4e32fcba617aa37d41)
- [CNA](https://git.kernel.org/stable/c/2579c356ccd35d06238b176e4b460978186d804b)
- [CNA](https://git.kernel.org/stable/c/7dc211c1159d991db609bdf4b0fb9033c04adcbc)
- [siemens-SADP](https://cert-portal.siemens.com/productcert/html/ssa-019113.html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.20%
- **EPSS Percentile:** 10.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._