CVE-2025-21806: net: let net.core.dev_weight always be non-zero

Q: Is CVE-2025-21806 a local or remote vulnerability?

CVE-2025-21806 is primarily a local vulnerability, affecting the user privileges on systems running the affected kernel version.

Published Feb 27, 2025

Updated

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

net: let net.core.devweight always be non-zero

The following problem was encountered during stability test:

(NULL netdevice): NAPI poll function processbacklog+0x0/0x530 \ returned 1, exceeding its budget of 0. ------------[ cut here ]------------ listadd double add: new=ffff88905f746f48, prev=ffff88905f746f48, \ next=ffff88905f746e40. WARNING: CPU: 18 PID: 5462 at lib/listdebug.c:35 \ listaddvalidorreport+0xf3/0x130 CPU: 18 UID: 0 PID: 5462 Comm: ping Kdump: loaded Not tainted 6.13.0-rc7+ RIP: 0010:listaddvalidorreport+0xf3/0x130 Call Trace: ? warn+0xcd/0x250 ? listaddvalidorreport+0xf3/0x130 enqueuetobacklog+0x923/0x1070 netifrxinternal+0x92/0x2b0 netifrx+0x15/0x170 loopbackxmit+0x2ef/0x450 devhardstartxmit+0x103/0x490 devqueuexmit+0xeac/0x1950 ipfinishoutput2+0x6cc/0x1620 ipoutput+0x161/0x270 ippushpendingframes+0x155/0x1a0 rawsendmsg+0xe13/0x1550 syssendto+0x3bf/0x4e0 x64syssendto+0xdc/0x1b0 dosyscall64+0x5b/0x170 entrySYSCALL64afterhwframe+0x76/0x7e

The reproduction command is as follows: sysctl -w net.core.devweight=0 ping 127.0.0.1

This is because when the napi's weight is set to 0, processbacklog() may return 0 and clear the NAPISTATESCHED bit of napi->state, causing this napi to be re-polled in netrxaction() until dosoftirq() times out. Since the NAPISTATESCHED bit has been cleared, napischedulerps() can be retriggered in enqueuetobacklog(), causing this issue.

Making the napi's weight always non-zero solves this problem.

Triggering this issue requires system-wide admin (setting is not namespaced).

Other sources

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

net: let net.core.devweight always be non-zero

The following problem was encountered during stability test:

The reproduction command is as follows: sysctl -w net.core.devweight=0 ping 127.0.0.1

This is because when the napi's weight is set to 0, processbacklog() may return 0 and clear the NAPISTATESCHED bit of napi-state, causing this napi to be re-polled in netrxaction() until dosoftirq() times out. Since the NAPISTATESCHED bit has been cleared, napischedulerps() can be retriggered in enqueuetobacklog(), causing this issue.

Making the napi's weight always non-zero solves this problem.

Triggering this issue requires system-wide admin (setting is not namespaced).

— IBM

Affected Software

220 affected componentsFixes available

Linux Kernel>=6.13.0-rc7+

IBM Verify Identity Access<=11.0 - 11.0.2

IBM Security Verify Access<=10.0 - 10.0.9.1

IBM Verify Identity Access Container<=11.0 - 11.0.2

IBM Security Verify Access Container<=10.0 - 10.0.9.1

Linux Linux kernel>=2.6.13<5.4.291

Linux Linux kernel>=5.5<5.10.235

Linux Linux kernel>=5.11<5.15.179

Linux Linux kernel>=5.16<6.1.129

Linux Linux kernel>=6.2<6.6.76

Linux Linux kernel>=6.7<6.12.13

Linux Linux kernel>=6.13<6.13.2

Linux Linux kernel=2.6.12

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-azure*

ubuntu/linux-lts-xenial*

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-aws-hwe*

ubuntu/linux-azure*

ubuntu/linux-gcp*

ubuntu/linux-hwe*

ubuntu/linux-hwe-edge*

ubuntu/linux-kvm*

ubuntu/linux-oracle*

ubuntu/linux-fips*

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-aws-5.4<5.4.0-1146.156~18.04.1

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ubuntu/linux-azure*

ubuntu/linux-azure-4.15*

ubuntu/linux-azure-5.3*

ubuntu/linux-azure-5.4<5.4.0-1151.158~18.04.1

5.4.0-1151.158~18.04.1

ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

ubuntu/linux-gcp-4.15*

ubuntu/linux-gcp-5.3*

ubuntu/linux-gcp-5.4<5.4.0-1149.158~18.04.1

5.4.0-1149.158~18.04.1

ubuntu/linux-gke-4.15*

ubuntu/linux-gke-5.4*

ubuntu/linux-gkeop-5.4*

ubuntu/linux-hwe*

ubuntu/linux-hwe-5.4<5.4.0-216.236~18.04.1

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ubuntu/linux-hwe-edge*

ubuntu/linux-ibm-5.4<5.4.0-1092.97~18.04.1

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ubuntu/linux-kvm*

ubuntu/linux-oem*

ubuntu/linux-oracle*

ubuntu/linux-oracle-5.0*

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ubuntu/linux-oracle-5.4<5.4.0-1144.154~18.04.1

5.4.0-1144.154~18.04.1

ubuntu/linux-raspi-5.4<5.4.0-1129.142~18.04.1

5.4.0-1129.142~18.04.1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

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ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

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ubuntu/linux-azure<5.4.0-1151.158

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ubuntu/linux-bluefield<5.4.0-1105.112

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ubuntu/linux-gcp<5.4.0-1149.158

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ubuntu/linux-gcp-5.15<5.15.0-1083.92~20.04.1

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ubuntu/linux-ibm<5.4.0-1092.97

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ubuntu/linux-ibm-5.15<5.15.0-1076.79~20.04.1

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ubuntu/linux-intel-iotg-5.15<5.15.0-1079.85~20.04.1

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ubuntu/linux-kvm<5.4.0-1133.142

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ubuntu/linux-azure-5.8*

ubuntu/linux-azure-fde*

ubuntu/linux-gcp-5.11*

ubuntu/linux-gcp-5.13*

ubuntu/linux-gcp-5.8*

ubuntu/linux-gke*

ubuntu/linux-gke-5.15*

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ubuntu/linux-hwe-5.8*

ubuntu/linux-intel-5.13*

ubuntu/linux-iot<5.4.0-1051.54

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ubuntu/linux-nvidia-tegra-5.15<5.15.0-1039.39~20.04.1

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ubuntu/linux-oem-5.10*

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ubuntu/linux-oem-5.6*

ubuntu/linux-oracle-5.11*

ubuntu/linux-oracle-5.13*

ubuntu/linux-oracle-5.8*

ubuntu/linux-raspi2*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.11*

ubuntu/linux-riscv-5.8*

ubuntu/linux-aws-fips<5.4.0-1146.156+fips1

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ubuntu/linux-azure-fips<5.4.0-1151.158+fips1

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ubuntu/linux-fips<5.4.0-1120.130

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ubuntu/linux-gcp-fips<5.4.0-1149.158+fips1

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ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.15.0-140.150

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ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws<5.15.0-1084.91

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ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-aws-6.5*

ubuntu/linux-aws-6.8<6.8.0-1032.34~22.04.1

6.8.0-1032.34~22.04.1

ubuntu/linux-azure<5.15.0-1089.98

5.15.0-1089.98

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-6.5*

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ubuntu/linux-azure-fde<5.15.0-1089.98.1

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ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-gcp<5.15.0-1083.92

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ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-gcp-6.5*

ubuntu/linux-gcp-6.8<6.8.0-1033.35~22.04.1

6.8.0-1033.35~22.04.1

ubuntu/linux-gke<5.15.0-1081.87

5.15.0-1081.87

ubuntu/linux-gkeop<5.15.0-1066.74

5.15.0-1066.74

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-hwe-6.5*

ubuntu/linux-hwe-6.8<6.8.0-64.67~22.04.1

6.8.0-64.67~22.04.1

ubuntu/linux-ibm<5.15.0-1076.79

5.15.0-1076.79

ubuntu/linux-ibm-6.8<6.8.0-1029.29~22.04.1

6.8.0-1029.29~22.04.1

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-intel-iotg<5.15.0-1079.85

5.15.0-1079.85

ubuntu/linux-kvm<5.15.0-1080.85

5.15.0-1080.85

ubuntu/linux-lowlatency<5.15.0-140.150

5.15.0-140.150

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-lowlatency-hwe-6.8<6.8.0-64.67.1~22.04.1

6.8.0-64.67.1~22.04.1

ubuntu/linux-nvidia<5.15.0-1078.79

5.15.0-1078.79

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

ubuntu/linux-nvidia-6.8<6.8.0-1031.34~22.04.1

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ubuntu/linux-nvidia-tegra<5.15.0-1037.37

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ubuntu/linux-nvidia-tegra-igx<5.15.0-1026.26

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ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

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ubuntu/linux-oracle<5.15.0-1081.87

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ubuntu/linux-oracle-6.5*

ubuntu/linux-oracle-6.8<6.8.0-1029.30~22.04.1

6.8.0-1029.30~22.04.1

ubuntu/linux-raspi<5.15.0-1078.81

5.15.0-1078.81

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-riscv-6.5*

ubuntu/linux-riscv-6.8<6.8.0-64.67~22.04.1

6.8.0-64.67~22.04.1

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

ubuntu/linux-xilinx-zynqmp<5.15.0-1050.54

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ubuntu/linux-bluefield<5.15.0-1066.68

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ubuntu/linux-intel-iot-realtime<5.15.0-1077.79

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ubuntu/linux-realtime<5.15.0-1084.93

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ubuntu/linux-realtime-6.8<6.8.1-1025.26~22.04.1

6.8.1-1025.26~22.04.1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips<5.15.0-1084.91+fips1

5.15.0-1084.91+fips1

ubuntu/linux-azure-fips<5.15.0-1089.98+fips1

5.15.0-1089.98+fips1

ubuntu/linux-fips<5.15.0-140.150+fips1

5.15.0-140.150+fips1

ubuntu/linux-gcp-fips<5.15.0-1083.92+fips1

5.15.0-1083.92+fips1

ubuntu/linux<6.8.0-64.67

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ubuntu/linux-aws<6.8.0-1032.34

6.8.0-1032.34

ubuntu/linux-azure<6.8.0-1034.39

6.8.0-1034.39

ubuntu/linux-azure-6.11<6.11.0-1015.15~24.04.1

6.11.0-1015.15~24.04.1

ubuntu/linux-azure-nvidia<6.8.0-1022.23

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ubuntu/linux-gcp<6.8.0-1033.35

6.8.0-1033.35

ubuntu/linux-gcp-6.11<6.11.0-1015.15~24.04.1

6.11.0-1015.15~24.04.1

ubuntu/linux-gke<6.8.0-1028.32

6.8.0-1028.32

ubuntu/linux-gkeop<6.8.0-1015.17

6.8.0-1015.17

ubuntu/linux-hwe-6.11<6.11.0-26.26~24.04.1

6.11.0-26.26~24.04.1

ubuntu/linux-ibm<6.8.0-1029.29

6.8.0-1029.29

ubuntu/linux-lowlatency<6.8.0-64.67.1

6.8.0-64.67.1

ubuntu/linux-lowlatency-hwe-6.11<6.11.0-1014.15~24.04.1

6.11.0-1014.15~24.04.1

ubuntu/linux-nvidia<6.8.0-1031.34

6.8.0-1031.34

ubuntu/linux-nvidia-6.11<6.11.0-1010.10

6.11.0-1010.10

ubuntu/linux-nvidia-lowlatency<6.8.0-1031.34.1

6.8.0-1031.34.1

ubuntu/linux-nvidia-tegra<6.8.0-1008.8

6.8.0-1008.8

ubuntu/linux-oem-6.11<6.11.0-1022.22

6.11.0-1022.22

ubuntu/linux-oem-6.8<6.8.0-1031.31

6.8.0-1031.31

ubuntu/linux-oracle<6.8.0-1029.30

6.8.0-1029.30

ubuntu/linux-raspi<6.8.0-1031.35

6.8.0-1031.35

ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-xilinx<6.8.0-1017.18

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ubuntu/linux-raspi-realtime<6.8.0-2026.27

6.8.0-2026.27

ubuntu/linux-realtime<6.8.1-1025.26

6.8.1-1025.26

ubuntu/linux-fips<6.8.0-78.78+fips1

6.8.0-78.78+fips1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

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Fixed in 6.8.0-1029.30~22.04.1
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Fixed in 5.15.0-1078.81
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Fixed in 6.8.0-64.67~22.04.1
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Fixed in 5.15.0-1050.54
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Fixed in 5.15.0-1066.68
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Fixed in 5.15.0-1077.79
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Fixed in 5.15.0-1084.93
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Fixed in 6.8.1-1025.26~22.04.1
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Fixed in 5.15.0-1084.91+fips1
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Fixed in 5.15.0-1089.98+fips1
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Fixed in 5.15.0-140.150+fips1
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Fixed in 5.15.0-1083.92+fips1
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Fixed in 6.8.0-64.67
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Fixed in 6.8.0-1032.34
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Fixed in 6.8.0-1034.39
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Fixed in 6.11.0-1015.15~24.04.1
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Fixed in 6.8.0-1022.23
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Fixed in 6.8.0-1033.35
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Fixed in 6.11.0-1015.15~24.04.1
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Fixed in 6.8.0-1028.32
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Fixed in 6.8.0-1015.17
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Fixed in 6.11.0-26.26~24.04.1
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Fixed in 6.8.0-1029.29
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Fixed in 6.8.0-64.67.1
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Fixed in 6.11.0-1014.15~24.04.1
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Fixed in 6.8.0-1031.34
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Fixed in 6.11.0-1010.10
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Fixed in 6.8.0-1031.34.1
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Fixed in 6.8.0-1008.8
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Fixed in 6.11.0-1022.22
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Fixed in 6.8.0-1031.31
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Fixed in 6.8.0-1029.30
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Fixed in 6.8.0-1031.35
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Fixed in 6.8.0-1017.18
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Fixed in 6.8.0-2026.27
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Fixed in 6.8.1-1025.26
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Fixed in 6.8.0-78.78+fips1
Configuration
Configure the net.core.dev_weight sysctl to a non-zero value; do not set it to 0.
Linux kernel net.core.dev_weight = non-zero

Event History

Feb 27, 2025

CVE Published

via MITRE·08:00 PM

Data Sourced

via MITRE·08:00 PM

Description

Data Sourced

via OSV·08:16 PM

DescriptionSeverityAffected Software

Data Sourced

via NVD·08:16 PM

RemedyDescriptionSeverityAffected Software

Data Sourced

via Red Hat·09:02 PM

DescriptionSeverityAffected Software

Jul 8, 2026

Data Sourced

via IBM·12:00 AM

DescriptionAffected Software

Parent advisories

This vulnerability appears in the following advisories.

IBM-7279510

Frequently Asked Questions

Is CVE-2025-21806 a local or remote vulnerability?

CVE-2025-21806 is primarily a local vulnerability, affecting the user privileges on systems running the affected kernel version.

CVE-2025-21806: net: let net.core.dev_weight always be non-zero

Other sources

Affected Software

Remediation

Event History

Parent advisories

Frequently Asked Questions

Is CVE-2025-21806 a local or remote vulnerability?

Company

Resources

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