CVE-2026-23080: can: mcba_usb: mcba_usb_read_bulk_callback(): fix URB memory leak

Q: What is the severity of CVE-2026-23080?

The severity of CVE-2026-23080 is medium, rated at 5.5 on the CVSS scale.

Q: How do I fix CVE-2026-23080?

To fix CVE-2026-23080, you should apply the available patch from the Linux kernel.

Q: What type of vulnerability is CVE-2026-23080?

CVE-2026-23080 is a memory leak vulnerability in the Linux kernel's mcba_usb driver.

Q: Which Linux kernel versions are affected by CVE-2026-23080?

CVEs generally affect specific versions of the Linux kernel; it is essential to check your kernel version against the patch notes.

Q: What is the impact of CVE-2026-23080?

The impact of CVE-2026-23080 is that it can lead to a memory leak, resulting in resource depletion over time.

Published Feb 4, 2026

Updated

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

can: mcbausb: mcbausbreadbulkcallback(): fix URB memory leak

Fix similar memory leak as in commit 7352e1d5932a ("can: gsusb: gsusbreceivebulkcallback(): fix URB memory leak").

In mcbausbprobe() -> mcbausbstart(), the URBs for USB-in transfers are allocated, added to the priv->rxsubmitted anchor and submitted. In the complete callback mcbausbreadbulkcallback(), the URBs are processed and resubmitted. In mcbausbclose() -> mcbaurbunlink() the URBs are freed by calling usbkillanchoredurbs(&priv->rxsubmitted).

However, this does not take into account that the USB framework unanchors the URB before the complete function is called. This means that once an in-URB has been completed, it is no longer anchored and is ultimately not released in usbkillanchoredurbs().

Fix the memory leak by anchoring the URB in the mcbausbreadbulkcallback()to the priv->rxsubmitted anchor.

Affected Software

247 affected componentsFixes available

linux/kernel

Linux Linux kernel>=4.12<5.10.249

Linux Linux kernel>=5.11<5.15.199

Linux Linux kernel>=5.16<6.1.162

Linux Linux kernel>=6.2<6.6.122

Linux Linux kernel>=6.7<6.12.68

Linux Linux kernel>=6.13<6.18.8

Linux Linux kernel=6.19-rc1

Linux Linux kernel=6.19-rc2

Linux Linux kernel=6.19-rc3

Linux Linux kernel=6.19-rc4

Linux Linux kernel=6.19-rc5

Linux Linux kernel=6.19-rc6

ubuntu/linux-azure*

ubuntu/linux-aws-hwe*

ubuntu/linux-azure*

ubuntu/linux-gcp*

ubuntu/linux-hwe*

ubuntu/linux-hwe-edge*

ubuntu/linux-oracle*

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*

ubuntu/linux-aws-5.13*

ubuntu/linux-aws-5.15<5.15.0-1105.112~20.04.1

5.15.0-1105.112~20.04.1

ubuntu/linux-aws-5.8*

ubuntu/linux-azure*

ubuntu/linux-azure-5.11*

ubuntu/linux-azure-5.13*

ubuntu/linux-azure-5.15<5.15.0-1110.119~20.04.1

5.15.0-1110.119~20.04.1

ubuntu/linux-azure-5.8*

ubuntu/linux-azure-fde*

ubuntu/linux-bluefield*

ubuntu/linux-gcp*

ubuntu/linux-gcp-5.11*

ubuntu/linux-gcp-5.13*

ubuntu/linux-gcp-5.15<5.15.0-1106.115~20.04.1

5.15.0-1106.115~20.04.1

ubuntu/linux-gcp-5.8*

ubuntu/linux-gke*

ubuntu/linux-gke-5.15*

ubuntu/linux-gkeop*

ubuntu/linux-gkeop-5.15*

ubuntu/linux-hwe-5.11*

ubuntu/linux-hwe-5.13*

ubuntu/linux-hwe-5.15<5.15.0-176.186~20.04.1

5.15.0-176.186~20.04.1

ubuntu/linux-hwe-5.8*

ubuntu/linux-ibm*

ubuntu/linux-ibm-5.15<5.15.0-1099.102~20.04.1

5.15.0-1099.102~20.04.1

ubuntu/linux-intel-5.13*

ubuntu/linux-intel-iotg-5.15<5.15.0-1100.106~20.04.1

5.15.0-1100.106~20.04.1

ubuntu/linux-iot*

ubuntu/linux-kvm*

ubuntu/linux-lowlatency-hwe-5.15<5.15.0-175.185~20.04.1

5.15.0-175.185~20.04.1

ubuntu/linux-nvidia-tegra-5.15<5.15.0-1057.57~20.04.1

5.15.0-1057.57~20.04.1

ubuntu/linux-oem-5.10*

ubuntu/linux-oem-5.13*

ubuntu/linux-oem-5.6*

ubuntu/linux-oracle*

ubuntu/linux-oracle-5.11*

ubuntu/linux-oracle-5.13*

ubuntu/linux-oracle-5.15<5.15.0-1102.108~20.04.1

5.15.0-1102.108~20.04.1

ubuntu/linux-oracle-5.8*

ubuntu/linux-raspi*

ubuntu/linux-raspi2*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.11*

ubuntu/linux-riscv-5.15<5.15.0-1099.103~20.04.1

5.15.0-1099.103~20.04.1

ubuntu/linux-riscv-5.8*

ubuntu/linux-xilinx-zynqmp*

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<5.15.0-176.186

5.15.0-176.186

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws<5.15.0-1105.112

5.15.0-1105.112

ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-aws-6.5*

ubuntu/linux-aws-6.8<6.8.0-1057.60~22.04.1

6.8.0-1057.60~22.04.1

ubuntu/linux-azure<5.15.0-1110.119

5.15.0-1110.119

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-6.5*

ubuntu/linux-azure-6.8<6.8.0-1059.65~22.04.1

6.8.0-1059.65~22.04.1

ubuntu/linux-azure-fde<5.15.0-1114.123

5.15.0-1114.123

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-azure-fde-6.8<6.8.0-1058.65~22.04.1

6.8.0-1058.65~22.04.1

ubuntu/linux-gcp<5.15.0-1105.114

5.15.0-1105.114

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-gcp-6.5*

ubuntu/linux-gcp-6.8<6.8.0-1060.63~22.04.1

6.8.0-1060.63~22.04.1

ubuntu/linux-gke<5.15.0-1101.107

5.15.0-1101.107

ubuntu/linux-gkeop<5.15.0-1088.96

5.15.0-1088.96

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-hwe-6.5*

ubuntu/linux-hwe-6.8<6.8.0-124.124~22.04.1

6.8.0-124.124~22.04.1

ubuntu/linux-ibm<5.15.0-1099.102

5.15.0-1099.102

ubuntu/linux-ibm-6.8<6.8.0-1055.56~22.04.1

6.8.0-1055.56~22.04.1

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-intel-iotg<5.15.0-1100.106

5.15.0-1100.106

ubuntu/linux-kvm<5.15.0-1097.102

5.15.0-1097.102

ubuntu/linux-lowlatency<5.15.0-175.185

5.15.0-175.185

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-lowlatency-hwe-6.8<6.8.0-117.117.1~22.04.1

6.8.0-117.117.1~22.04.1

ubuntu/linux-nvidia<5.15.0-1100.101

5.15.0-1100.101

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

ubuntu/linux-nvidia-6.8<6.8.0-1054.57~22.04.1

6.8.0-1054.57~22.04.1

ubuntu/linux-nvidia-tegra<5.15.0-1057.57

5.15.0-1057.57

ubuntu/linux-nvidia-tegra-igx<5.15.0-1046.46

5.15.0-1046.46

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oem-6.5*

ubuntu/linux-oracle<5.15.0-1102.108

5.15.0-1102.108

ubuntu/linux-oracle-6.5*

ubuntu/linux-oracle-6.8<6.8.0-1054.55~22.04.1

6.8.0-1054.55~22.04.1

ubuntu/linux-raspi<5.15.0-1099.102

5.15.0-1099.102

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-riscv-6.5*

ubuntu/linux-riscv-6.8<6.8.0-117.117~22.04.1

6.8.0-117.117~22.04.1

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

ubuntu/linux-xilinx-zynqmp<5.15.0-1070.74

5.15.0-1070.74

ubuntu/linux-bluefield<5.15.0-1089.91

5.15.0-1089.91

ubuntu/linux-intel-iot-realtime<5.15.0-1097.99

5.15.0-1097.99

ubuntu/linux-realtime<5.15.0-1104.113

5.15.0-1104.113

ubuntu/linux-realtime-6.8<6.8.1-1051.52~22.04.1

6.8.1-1051.52~22.04.1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips<5.15.0-1105.112+fips1

5.15.0-1105.112+fips1

ubuntu/linux-azure-fips<5.15.0-1110.119+fips1

5.15.0-1110.119+fips1

ubuntu/linux-fips<5.15.0-176.186+fips1

5.15.0-176.186+fips1

ubuntu/linux-gcp-fips<5.15.0-1105.114+fips1

5.15.0-1105.114+fips1

ubuntu/linux<6.8.0-117.117

6.8.0-117.117

ubuntu/linux-aws<6.8.0-1055.58

6.8.0-1055.58

ubuntu/linux-aws-6.14*

ubuntu/linux-aws-6.17*

ubuntu/linux-azure<6.8.0-1056.62

6.8.0-1056.62

ubuntu/linux-azure-6.11*

ubuntu/linux-azure-6.14*

ubuntu/linux-azure-6.17<6.17.0-1021.21~24.04.1

6.17.0-1021.21~24.04.1

ubuntu/linux-azure-fde<6.8.0-1058.65

6.8.0-1058.65

ubuntu/linux-azure-fde-6.14*

ubuntu/linux-azure-nvidia*

ubuntu/linux-azure-nvidia-6.14*

ubuntu/linux-gcp<6.8.0-1058.61

6.8.0-1058.61

ubuntu/linux-gcp-6.11*

ubuntu/linux-gcp-6.14*

ubuntu/linux-gcp-6.17<6.17.0-1021.24~24.04.1

6.17.0-1021.24~24.04.1

ubuntu/linux-gke<6.8.0-1054.60

6.8.0-1054.60

ubuntu/linux-gkeop<6.8.0-1041.44

6.8.0-1041.44

ubuntu/linux-hwe-6.11*

ubuntu/linux-hwe-6.14*

ubuntu/linux-hwe-6.17<6.17.0-41.41~24.04.1

6.17.0-41.41~24.04.1

ubuntu/linux-ibm<6.8.0-1055.56

6.8.0-1055.56

ubuntu/linux-lowlatency<6.8.0-117.117.1

6.8.0-117.117.1

ubuntu/linux-lowlatency-hwe-6.11*

ubuntu/linux-nvidia<6.8.0-1054.57

6.8.0-1054.57

ubuntu/linux-nvidia-6.11*

ubuntu/linux-nvidia-6.17<6.17.0-1031.31

6.17.0-1031.31

ubuntu/linux-nvidia-lowlatency<6.8.0-1054.57.1

6.8.0-1054.57.1

ubuntu/linux-nvidia-tegra<6.8.0-1024.24

6.8.0-1024.24

ubuntu/linux-oem-6.11*

ubuntu/linux-oem-6.14*

ubuntu/linux-oem-6.17<6.17.0-1030.30

6.17.0-1030.30

ubuntu/linux-oem-6.8*

ubuntu/linux-oracle<6.8.0-1054.55

6.8.0-1054.55

ubuntu/linux-oracle-6.14*

ubuntu/linux-oracle-6.17<6.17.0-1019.19~24.04.3

6.17.0-1019.19~24.04.3

ubuntu/linux-raspi<6.8.0-1056.60

6.8.0-1056.60

ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-6.14*

ubuntu/linux-riscv-6.17*

ubuntu/linux-xilinx<6.8.0-1032.33

6.8.0-1032.33

ubuntu/linux-bluefield<6.8.0-1022.26

6.8.0-1022.26

ubuntu/linux-raspi-realtime<6.8.0-2045.46

6.8.0-2045.46

ubuntu/linux-realtime<6.8.1-1051.52

6.8.1-1051.52

ubuntu/linux-realtime-6.14*

ubuntu/linux-realtime-6.17<6.17.0-1018.20~24.04.1

6.17.0-1018.20~24.04.1

ubuntu/linux-aws-fips<6.8.0-1055.58+fips1

6.8.0-1055.58+fips1

ubuntu/linux-azure-fips<6.8.0-1059.65+fips1

6.8.0-1059.65+fips1

ubuntu/linux-fips<6.8.0-116.116+fips1

6.8.0-116.116+fips1

ubuntu/linux-gcp-fips<6.8.0-1058.61+fips1

6.8.0-1058.61+fips1

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-azure*

ubuntu/linux-azure-fde*

ubuntu/linux-gcp*

ubuntu/linux-oracle*

ubuntu/linux-raspi*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

debian/linux

6.1.176-16.1.190-16.12.107-16.12.115-27.2.15-17.3.3-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade ubuntu/linux-aws-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1105.112~20.04.1
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Fixed in 5.15.0-1110.119~20.04.1
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Fixed in 5.15.0-1106.115~20.04.1
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Fixed in 5.15.0-176.186~20.04.1
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Fixed in 5.15.0-1099.102~20.04.1
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Fixed in 5.15.0-1100.106~20.04.1
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Fixed in 5.15.0-175.185~20.04.1
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Fixed in 5.15.0-1057.57~20.04.1
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Fixed in 5.15.0-1102.108~20.04.1
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Fixed in 5.15.0-1099.103~20.04.1
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Fixed in 5.15.0-176.186
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Fixed in 5.15.0-1105.112
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Fixed in 6.8.0-1057.60~22.04.1
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Fixed in 5.15.0-1110.119
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Fixed in 6.8.0-1059.65~22.04.1
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Fixed in 5.15.0-1114.123
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Fixed in 6.8.0-1058.65~22.04.1
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Fixed in 5.15.0-1105.114
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Fixed in 6.8.0-1060.63~22.04.1
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Fixed in 5.15.0-1101.107
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Fixed in 5.15.0-1088.96
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Fixed in 6.8.0-124.124~22.04.1
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Fixed in 5.15.0-1099.102
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Fixed in 6.8.0-1055.56~22.04.1
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Fixed in 5.15.0-1100.106
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Fixed in 5.15.0-1097.102
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Fixed in 5.15.0-175.185
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Fixed in 6.8.0-117.117.1~22.04.1
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Fixed in 5.15.0-1100.101
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Fixed in 6.8.0-1054.57~22.04.1
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Fixed in 5.15.0-1057.57
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Fixed in 5.15.0-1046.46
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Fixed in 5.15.0-1102.108
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Fixed in 6.8.0-1054.55~22.04.1
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Fixed in 5.15.0-1099.102
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Fixed in 6.8.0-117.117~22.04.1
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Fixed in 5.15.0-1070.74
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Fixed in 5.15.0-1089.91
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Fixed in 5.15.0-1097.99
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Fixed in 5.15.0-1104.113
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Fixed in 6.8.1-1051.52~22.04.1
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Fixed in 5.15.0-1105.112+fips1
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Fixed in 5.15.0-1110.119+fips1
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Fixed in 5.15.0-176.186+fips1
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Fixed in 5.15.0-1105.114+fips1
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Fixed in 6.8.0-117.117
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Fixed in 6.8.0-1055.58
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Fixed in 6.8.0-1056.62
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Fixed in 6.17.0-1021.21~24.04.1
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Fixed in 6.8.0-1058.65
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Fixed in 6.8.0-1058.61
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Fixed in 6.17.0-1021.24~24.04.1
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Fixed in 6.8.0-1054.60
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Fixed in 6.8.0-1041.44
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Fixed in 6.17.0-41.41~24.04.1
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Fixed in 6.8.0-1055.56
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Fixed in 6.8.0-117.117.1
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Fixed in 6.8.0-1054.57
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Fixed in 6.17.0-1031.31
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Fixed in 6.8.0-1054.57.1
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Fixed in 6.8.0-1024.24
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Fixed in 6.17.0-1030.30
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Fixed in 6.8.0-1054.55
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Fixed in 6.17.0-1019.19~24.04.3
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Fixed in 6.8.0-1056.60
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Fixed in 6.8.0-1032.33
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Fixed in 6.8.0-1022.26
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Fixed in 6.8.0-2045.46
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Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.
Fixed in 6.8.1-1051.52
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Fixed in 6.17.0-1018.20~24.04.1
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Fixed in 6.8.0-1055.58+fips1
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Fixed in 6.8.0-1059.65+fips1
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Fixed in 6.8.0-116.116+fips1
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Fixed in 6.8.0-1058.61+fips1
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Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.115-2Fixed in 7.2.15-1Fixed in 7.3.3-1

Event History

Feb 4, 2026

CVE Published

via MITRE·04:08 PM

Data Sourced

via MITRE·04:08 PM

Description

Data Sourced

via OSV·05:16 PM

DescriptionSeverityAffected Software

Event

via OSV·05:16 PM

Data Sourced

via NVD·05:16 PM

RemedyDescriptionSeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

What is the severity of CVE-2026-23080?

The severity of CVE-2026-23080 is medium, rated at 5.5 on the CVSS scale.

How do I fix CVE-2026-23080?

To fix CVE-2026-23080, you should apply the available patch from the Linux kernel.

What type of vulnerability is CVE-2026-23080?

CVE-2026-23080 is a memory leak vulnerability in the Linux kernel's mcba_usb driver.

Which Linux kernel versions are affected by CVE-2026-23080?

CVEs generally affect specific versions of the Linux kernel; it is essential to check your kernel version against the patch notes.

What is the impact of CVE-2026-23080?

The impact of CVE-2026-23080 is that it can lead to a memory leak, resulting in resource depletion over time.

CVE-2026-23080: can: mcba_usb: mcba_usb_read_bulk_callback(): fix URB memory leak

Affected Software

Remediation

Event History

Parent advisories

Peer vulnerabilities

Frequently Asked Questions

What is the severity of CVE-2026-23080?

How do I fix CVE-2026-23080?

What type of vulnerability is CVE-2026-23080?

Which Linux kernel versions are affected by CVE-2026-23080?

What is the impact of CVE-2026-23080?

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