CVE-2026-68300: sctp: auth: verify auth requirement when auth_chunk is NULL

Q: What is the severity of CVE-2026-68300?

CVE-2026-68300 has a risk score of 51, indicating a moderate vulnerability.

Q: How do I fix CVE-2026-68300?

To fix CVE-2026-68300, ensure that you update your Linux kernel to the latest version where this vulnerability has been resolved.

Q: What systems are affected by CVE-2026-68300?

CVE-2026-68300 affects systems running specific versions of the Linux kernel that utilize SCTP (Stream Control Transmission Protocol) authentication.

Q: What type of attack can CVE-2026-68300 facilitate?

CVE-2026-68300 can facilitate unauthorized access or bypass of authentication due to the failure in verifying authentication requirements.

Q: When was CVE-2026-68300 published?

CVE-2026-68300 was published on August 10, 2026.

Published Aug 10, 2026

Updated

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

sctp: auth: verify auth requirement when authchunk is NULL

sctpauthchunkverify() returns true unconditionally when chunk->authchunk is NULL, silently skipping authentication. This is incorrect when:

1. skbclone() failed in the BH receive path, leaving authchunk NULL. In sctpendpointbhrcv() asoc is NULL for new connections, so the early sctpauthrecvcid() check cannot catch this.

2. No AUTH chunk precedes COOKIE-ECHO, so skbclone() is never called and authchunk remains NULL.

Fix by checking sctpauthrecvcid() when authchunk is NULL: if authentication is required, return false to drop the chunk; otherwise continue normally.

Other sources

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

sctp: auth: verify auth requirement when authchunk is NULL

sctpauthchunkverify() returns true unconditionally when chunk-authchunk is NULL, silently skipping authentication. This is incorrect when:

1. skbclone() failed in the BH receive path, leaving authchunk NULL. In sctpendpointbhrcv() asoc is NULL for new connections, so the early sctpauthrecvcid() check cannot catch this.

2. No AUTH chunk precedes COOKIE-ECHO, so skbclone() is never called and authchunk remains NULL.

Fix by checking sctpauthrecvcid() when authchunk is NULL: if authentication is required, return false to drop the chunk; otherwise continue normally.

— IBM

Affected Software

259 affected componentsFixes available

Linux Linux kernel

Microsoft azl3 kernel 6.6.143.1-1<6.6.150.1-1

6.6.150.1-1

IBM QRadar<=7.6.0.0 - 7.6.0.4

IBM QRadar<=7.5.0 - 7.5.0 UP16 IF01

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*

ubuntu/linux-azure*

ubuntu/linux-azure-4.15*

ubuntu/linux-azure-5.3*

ubuntu/linux-azure-5.4*

ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

ubuntu/linux-gcp-4.15*

ubuntu/linux-gcp-5.3*

ubuntu/linux-gcp-5.4*

ubuntu/linux-gke-4.15*

ubuntu/linux-gke-5.4*

ubuntu/linux-gkeop-5.4*

ubuntu/linux-hwe*

ubuntu/linux-hwe-5.4*

ubuntu/linux-hwe-edge*

ubuntu/linux-ibm-5.4*

ubuntu/linux-kvm*

ubuntu/linux-oem*

ubuntu/linux-oracle*

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux-oracle-5.4*

ubuntu/linux-raspi-5.4*

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-aws-5.11*

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ubuntu/linux-gcp-5.8*

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ubuntu/linux-intel-iotg-5.15<5.15.0-1112.118~20.04.1

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ubuntu/linux-iot*

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ubuntu/linux-riscv-5.8*

ubuntu/linux-xilinx-zynqmp*

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

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ubuntu/linux-azure-fips*

ubuntu/linux-fips*

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ubuntu/linux<5.15.0-198.208

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ubuntu/linux-gcp<5.15.0-1118.128

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ubuntu/linux-hwe-5.19*

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ubuntu/linux-ibm<5.15.0-1111.115

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ubuntu/linux-intel-iot-realtime*

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ubuntu/linux-kvm<5.15.0-1109.114

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ubuntu/linux-lowlatency<5.15.0-195.205

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ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-lowlatency-hwe-6.8*

ubuntu/linux-nvidia<5.15.0-1112.113

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ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

ubuntu/linux-nvidia-6.8*

ubuntu/linux-nvidia-tegra<5.15.0-1070.72

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ubuntu/linux-nvidia-tegra-igx<5.15.0-1059.59

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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<5.15.0-1114.120

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ubuntu/linux-oracle-6.5*

ubuntu/linux-oracle-6.8*

ubuntu/linux-raspi*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-riscv-6.5*

ubuntu/linux-riscv-6.8*

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

ubuntu/linux-xilinx-zynqmp<5.15.0-1080.84

5.15.0-1080.84

ubuntu/linux-bluefield<5.15.0-1101.103

5.15.0-1101.103

ubuntu/linux-intel-iot-realtime<5.15.0-1109.111

5.15.0-1109.111

ubuntu/linux-realtime<5.15.0-1116.125

5.15.0-1116.125

ubuntu/linux-realtime-6.8*

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips<5.15.0-1117.124+fips1

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ubuntu/linux-fips<5.15.0-198.208+fips1

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6.8.0-147.147

ubuntu/linux-aws<6.8.0-1067.70

6.8.0-1067.70

ubuntu/linux-aws-6.14*

ubuntu/linux-aws-6.17*

ubuntu/linux-aws-7.0<7.0.0-1014.14~24.04.1

7.0.0-1014.14~24.04.1

ubuntu/linux-azure<6.8.0-1071.79

6.8.0-1071.79

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ubuntu/linux-azure-fde-7.0<7.0.0-1016.16~24.04.1

7.0.0-1016.16~24.04.1

ubuntu/linux-azure-nvidia*

ubuntu/linux-azure-nvidia-6.14*

ubuntu/linux-gcp<6.8.0-1071.79

6.8.0-1071.79

ubuntu/linux-gcp-6.11*

ubuntu/linux-gcp-6.14*

ubuntu/linux-gcp-7.0<7.0.0-1014.14~24.04.1

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ubuntu/linux-gke<6.8.0-1066.74

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ubuntu/linux-gkeop<6.8.0-1052.56

6.8.0-1052.56

ubuntu/linux-hwe-6.11*

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ubuntu/linux-hwe-6.17*

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7.0.0-38.38~24.04.4

ubuntu/linux-ibm<6.8.0-1067.68

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ubuntu/linux-lowlatency<6.8.0-147.147.1

6.8.0-147.147.1

ubuntu/linux-lowlatency-hwe-6.11*

ubuntu/linux-nvidia*

ubuntu/linux-nvidia-6.11*

ubuntu/linux-nvidia-6.17*

ubuntu/linux-nvidia-7.0<7.0.0-1024.25~24.04.1

7.0.0-1024.25~24.04.1

ubuntu/linux-nvidia-lowlatency*

ubuntu/linux-nvidia-tegra<6.8.0-1035.38

6.8.0-1035.38

ubuntu/linux-oem-6.11*

ubuntu/linux-oem-6.14*

ubuntu/linux-oem-6.17*

ubuntu/linux-oem-6.8*

ubuntu/linux-oracle<6.8.0-1064.67

6.8.0-1064.67

ubuntu/linux-oracle-6.14*

ubuntu/linux-oracle-6.17*

ubuntu/linux-oracle-7.0<7.0.0-1013.13~24.04.1

7.0.0-1013.13~24.04.1

ubuntu/linux-raspi*

ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-6.14*

ubuntu/linux-riscv-6.17*

ubuntu/linux-riscv-7.0<7.0.0-38.38.1~24.04.1

7.0.0-38.38.1~24.04.1

ubuntu/linux-vmware<6.8.0-1008.8

6.8.0-1008.8

ubuntu/linux-xilinx*

ubuntu/linux-bluefield<6.8.0-1033.38

6.8.0-1033.38

ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime<6.8.1-1062.63

6.8.1-1062.63

ubuntu/linux-realtime-6.14*

ubuntu/linux-realtime-6.17*

ubuntu/linux-aws-fips<6.8.0-1067.70+fips1

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ubuntu/linux-azure-fips<6.8.0-1071.79+fips1

6.8.0-1071.79+fips1

ubuntu/linux-fips<6.8.0-147.147+fips1

6.8.0-147.147+fips1

ubuntu/linux-gcp-fips<6.8.0-1071.79+fips1

6.8.0-1071.79+fips1

ubuntu/linux<7.0.0-38.38

7.0.0-38.38

ubuntu/linux-aws<7.0.0-1014.14

7.0.0-1014.14

ubuntu/linux-azure<7.0.0-1017.17

7.0.0-1017.17

ubuntu/linux-azure-fde<7.0.0-1016.16

7.0.0-1016.16

ubuntu/linux-gcp<7.0.0-1014.14

7.0.0-1014.14

ubuntu/linux-gke<7.0.0-1008.9

7.0.0-1008.9

ubuntu/linux-ibm<7.0.0-1015.15

7.0.0-1015.15

ubuntu/linux-nvidia*

ubuntu/linux-nvidia-bos<7.0.0-2022.23

7.0.0-2022.23

ubuntu/linux-oem-7.0<7.0.0-1015.15

7.0.0-1015.15

ubuntu/linux-oracle<7.0.0-1013.13

7.0.0-1013.13

ubuntu/linux-raspi*

ubuntu/linux-realtime<7.0.0-38.38.1

7.0.0-38.38.1

ubuntu/linux-riscv<7.0.0-38.38.1

7.0.0-38.38.1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

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Fixed in 7.0.0-1008.9
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Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 7.0.0-1015.15
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Upgrade ubuntu/linux-nvidia-bos to a version that resolves this vulnerability.
Fixed in 7.0.0-2022.23
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Upgrade ubuntu/linux-oem-7.0 to a version that resolves this vulnerability.
Fixed in 7.0.0-1015.15
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Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 7.0.0-1013.13
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Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.
Fixed in 7.0.0-38.38.1
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Upgrade ubuntu/linux-riscv to a version that resolves this vulnerability.
Fixed in 7.0.0-38.38.1
Compensating control
In sctp_auth_recv_cid(), when auth_chunk is NULL, return false to drop the chunk if authentication is required; otherwise continue normally. This covers new connections and cases where skb_clone() failed in the BH receive path.

Event History

Aug 10, 2026

CVE Published

via MITRE·12:02 PM

Data Sourced

via MITRE·12:02 PM

DescriptionSeverity

Data Sourced

via Red Hat·12:35 PM

DescriptionSeverityAffected Software

Data Sourced

via OSV·01:20 PM

DescriptionSeverityAffected Software

Data Sourced

via NVD·01:20 PM

DescriptionSeverityWeakness

Aug 11, 2026

Data Sourced

via Microsoft·08:12 AM

DescriptionSeverityWeakness

Data Sourced

via Microsoft·08:12 AM

Affected Software

Oct 13, 2026

Data Sourced

via IBM·12:00 AM

DescriptionAffected Software

Parent advisories

This vulnerability appears in the following advisories.

IBM-7292240

Frequently Asked Questions

What is the severity of CVE-2026-68300?

CVE-2026-68300 has a risk score of 51, indicating a moderate vulnerability.

How do I fix CVE-2026-68300?

To fix CVE-2026-68300, ensure that you update your Linux kernel to the latest version where this vulnerability has been resolved.

What systems are affected by CVE-2026-68300?

CVE-2026-68300 affects systems running specific versions of the Linux kernel that utilize SCTP (Stream Control Transmission Protocol) authentication.

What type of attack can CVE-2026-68300 facilitate?

CVE-2026-68300 can facilitate unauthorized access or bypass of authentication due to the failure in verifying authentication requirements.

When was CVE-2026-68300 published?

CVE-2026-68300 was published on August 10, 2026.

CVE-2026-68300: sctp: auth: verify auth requirement when auth_chunk is NULL

Other sources

Affected Software

Remediation

Event History

Parent advisories

Frequently Asked Questions

What is the severity of CVE-2026-68300?

How do I fix CVE-2026-68300?

What systems are affected by CVE-2026-68300?

What type of attack can CVE-2026-68300 facilitate?

When was CVE-2026-68300 published?

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