CVE-2025-38270 (GCVE-0-2025-38270)

Vulnerability from cvelistv5 – Published: 2025-07-10 07:41 – Updated: 2026-08-05 12:00
VLAI
Title
net: drv: netdevsim: don't napi_complete() from netpoll
Summary
In the Linux kernel, the following vulnerability has been resolved: net: drv: netdevsim: don't napi_complete() from netpoll netdevsim supports netpoll. Make sure we don't call napi_complete() from it, since it may not be scheduled. Breno reports hitting a warning in napi_complete_done(): WARNING: CPU: 14 PID: 104 at net/core/dev.c:6592 napi_complete_done+0x2cc/0x560 __napi_poll+0x2d8/0x3a0 handle_softirqs+0x1fe/0x710 This is presumably after netpoll stole the SCHED bit prematurely.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3762ec05a9fbda16aaaa2568df679ab8ad13f38d , < a8ff2e362d901200a1075c3ca9c56d9c7bbef389 (git)
Affected: 3762ec05a9fbda16aaaa2568df679ab8ad13f38d , < 6837dd877270c57689bd866de9f3de14172c2439 (git)
Affected: 3762ec05a9fbda16aaaa2568df679ab8ad13f38d , < 1264971017b4d7141352a7fe29021bdfce5d885d (git)
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Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.12.34 , ≤ 6.12.* (semver)
Unaffected: 6.15.3 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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              "value": "AV:L - netdevsim is a purely software-simulated netdev with no physical link; the vulnerable `nsim_poll()` is reached by transmitting on a local netdevsim interface (`nsim_start_xmit` \u2192 `nsim_napi_rx` \u2192 `napi_schedule`) or via a locally configured netconsole/netpoll. There is no path from unsolicited remote traffic in a default configuration.\nAC:L - The attacker fully controls both the trigger and the race: queuing \u226564 skbs on one RX ring makes `nsim_rcv()` return the full budget deterministically, and concurrent `napi_schedule()` from a second thread on another CPU is trivially arranged by multi-threaded sending. No condition depends on state outside the attacker\u0027s influence.\nPR:L - Given a netdevsim interface present in the attacker\u0027s network namespace (a routine setup on CI/test hosts and in admin-provisioned containers), an ordinary unprivileged local user can drive the RX ring to full budget simply by sending packets \u2014 no capability check guards `nsim_start_xmit()` or the NAPI poll path.\nUI:N - The condition is triggered entirely by the attacker\u0027s own packet transmission and softirq NAPI processing; no victim action of any kind is needed.\nS:U - The corrupted state (NAPI `state` bits, `poll_list`, GRO lists) and the resulting impact are all within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Clearing `NAPIF_STATE_SCHED` while still owning the instance destroys NAPI\u0027s only mutual-exclusion guarantee (netpoll_poll_lock is a no-op without netpoll), allowing two CPUs to run the same NAPI concurrently over shared `napi-\u003egro` and skb lists; the resulting list corruption/UAF is leverageable to read adjacent kernel memory.\nI:H - A `list_add_tail()` of an already-linked `poll_list` node onto a second CPU\u0027s poll list is an unlinked-pointer write into kernel list structures, and concurrent GRO/skb-queue manipulation yields further heap corruption \u2014 both classic primitives for controlled kernel memory writes.\nA:H - The reported symptom is a `WARN_ON_ONCE` in `napi_complete_done()` (fatal under `panic_on_warn`), and the NAPI-state desync additionally causes list corruption, `pr_crit` under `CONFIG_DEBUG_NET`, softirq loops, and oopses that take down the machine."
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      "cve": "CVE-2025-38270",
      "id": "CVE-2025-38270",
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      "product_status:recommended": "154",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-38270",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-38270.json",
      "version": "33"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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