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Review reviewHigh

CVE-2025-38270

Linux Linux, linux kernel

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.

CVSS
7.8
EPSS
0.17%
6.20% percentile
CISA KEV
Not listed
Published
2025.07.10
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.17%
Technical severityCVSS 7.8

Vulnerability overview

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.

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 3762ec05a9fbda16aaaa2568df679ab8ad13f38d < a8ff2e362d901200a1075c3ca9c56d9c7bbef389, >= 3762ec05a9fbda16aaaa2568df679ab8ad13f38d < 6837dd877270c57689bd866de9f3de14172c2439, >= 3762ec05a9fbda16aaaa2568df679ab8ad13f38d < 1264971017b4d7141352a7fe29021bdfce5d885d, >= 6.10, >= 6.10 < 6.12.34, >= 6.13 < 6.15.3, 6.16
Fixed versions
6.12.34, 6.15.3

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available