CVE-2026-45998: rxrpc: Fix potential UAF after skb_unshare() failure

Q: What access and privileges does exploitation require?

The CVSS vector indicates local access, low privileges, high attack complexity, and no user interaction. The impact is rated high for confidentiality, integrity, and availability.

Q: Which products are identified as affected?

The listed affected software includes the Linux kernel and Microsoft azl3 kernel version 6.6.139.1-1.

Published May 27, 2026

Updated

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

rxrpc: Fix potential UAF after skbunshare() failure

If skbunshare() fails to unshare a packet due to allocation failure in rxrpcinputpacket(), the skb pointer in the parent (rxrpciothread()) will be NULL'd out. This will likely cause the call to tracerxrpcrxdone() to oops.

Fix this by moving the unsharing down to where rxrpcinputcallevent() calls rxrpcinputcallpacket(). There are a number of places prior to that where we ignore DATA packets for a variety of reasons (such as the call already being complete) for which an unshare is then avoided.

And with that, rxrpcinputpacket() doesn't need to take a pointer to the pointer to the packet, so change that to just a pointer.

Affected Software

176 affected componentsFixes available

Linux Linux kernel

Microsoft azl3 kernel 6.6.139.1-1<6.6.141.1-1

6.6.141.1-1

Linux Linux kernel>=6.2<6.6.140

Linux Linux kernel>=6.7<6.12.86

Linux Linux kernel>=6.13<6.18.27

Linux Linux kernel>=6.19<7.0.4

debian/linux<6.12.86-1

6.12.86-1

debian/linux<7.0.4-1

7.0.4-1

linux/kernel>=6.2.0<6.6.140

6.6.140

linux/kernel>=6.7.0<6.12.86

6.12.86

linux/kernel>=6.13.0<6.18.27

6.18.27

linux/kernel>=6.19.0<7.0.4

7.0.4

debian/linux

6.1.176-16.1.190-16.12.107-16.12.116-17.2.15-17.3.3-1

ubuntu/linux-hwe-edge*

ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-azure*

ubuntu/linux-azure-5.3*

ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

ubuntu/linux-gcp-5.3*

ubuntu/linux-gke-4.15*

ubuntu/linux-gke-5.4*

ubuntu/linux-gkeop-5.4*

ubuntu/linux-hwe*

ubuntu/linux-hwe-edge*

ubuntu/linux-oem*

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux-aws-5.11*

ubuntu/linux-aws-5.13*

ubuntu/linux-aws-5.8*

ubuntu/linux-azure-5.11*

ubuntu/linux-azure-5.13*

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*

ubuntu/linux-gkeop*

ubuntu/linux-gkeop-5.15*

ubuntu/linux-hwe-5.11*

ubuntu/linux-hwe-5.13*

ubuntu/linux-hwe-5.8*

ubuntu/linux-intel-5.13*

ubuntu/linux-oem-5.10*

ubuntu/linux-oem-5.13*

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-allwinner-5.19*

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-5.19*

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-5.19*

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-5.19*

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-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-6.8<6.8.0-1057.58~22.04.1

6.8.0-1057.58~22.04.1

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-lowlatency-hwe-6.8<6.8.0-134.134.1~22.04.1

6.8.0-134.134.1~22.04.1

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

ubuntu/linux-nvidia-6.8<6.8.0-1055.58~22.04.1

6.8.0-1055.58~22.04.1

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oem-6.5*

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-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-riscv-6.5*

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

6.8.0-124.124~22.04.1

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

ubuntu/linux-realtime-6.8<6.8.1-1052.53~22.04.1

6.8.1-1052.53~22.04.1

ubuntu/linux<6.8.0-124.124

6.8.0-124.124

ubuntu/linux-aws<6.8.0-1057.60

6.8.0-1057.60

ubuntu/linux-aws-6.14*

ubuntu/linux-aws-6.17<6.17.0-1017.17~24.04.1

6.17.0-1017.17~24.04.1

ubuntu/linux-azure<6.8.0-1058.64

6.8.0-1058.64

ubuntu/linux-azure-6.11*

ubuntu/linux-azure-6.14*

ubuntu/linux-azure-6.17<6.17.0-1017.17~24.04.1

6.17.0-1017.17~24.04.1

ubuntu/linux-azure-fde<6.8.0-1058.65

6.8.0-1058.65

ubuntu/linux-azure-fde-6.14*

ubuntu/linux-azure-nvidia<6.8.0-1039.42

6.8.0-1039.42

ubuntu/linux-azure-nvidia-6.14*

ubuntu/linux-gcp<6.8.0-1060.63

6.8.0-1060.63

ubuntu/linux-gcp-6.11*

ubuntu/linux-gcp-6.14*

ubuntu/linux-gcp-6.17<6.17.0-1018.19~24.04.1

6.17.0-1018.19~24.04.1

ubuntu/linux-gke<6.8.0-1055.61

6.8.0-1055.61

ubuntu/linux-gkeop<6.8.0-1042.45

6.8.0-1042.45

ubuntu/linux-hwe-6.11*

ubuntu/linux-hwe-6.14*

ubuntu/linux-hwe-6.17<6.17.0-35.35~24.04.1

6.17.0-35.35~24.04.1

ubuntu/linux-hwe-7.0<7.0.0-28.28~24.04.1

7.0.0-28.28~24.04.1

ubuntu/linux-ibm<6.8.0-1057.58

6.8.0-1057.58

ubuntu/linux-lowlatency<6.8.0-134.134.1

6.8.0-134.134.1

ubuntu/linux-lowlatency-hwe-6.11*

ubuntu/linux-nvidia<6.8.0-1055.58

6.8.0-1055.58

ubuntu/linux-nvidia-6.11*

ubuntu/linux-nvidia-6.17<6.17.0-1021.21

6.17.0-1021.21

ubuntu/linux-nvidia-lowlatency<6.8.0-1055.58.1

6.8.0-1055.58.1

ubuntu/linux-nvidia-tegra<6.8.0-1026.26

6.8.0-1026.26

ubuntu/linux-oem-6.11*

ubuntu/linux-oem-6.14*

ubuntu/linux-oem-6.17<6.17.0-1024.24

6.17.0-1024.24

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<6.17.0-1016.16~24.04.1

6.17.0-1016.16~24.04.1

ubuntu/linux-raspi<6.8.0-1057.61

6.8.0-1057.61

ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-6.14*

ubuntu/linux-riscv-6.17<6.17.0-35.35.1~24.04.1

6.17.0-35.35.1~24.04.1

ubuntu/linux-xilinx<6.8.0-1032.33

6.8.0-1032.33

ubuntu/linux-bluefield<6.8.0-1023.27

6.8.0-1023.27

ubuntu/linux-raspi-realtime<6.8.0-2046.47

6.8.0-2046.47

ubuntu/linux-realtime<6.8.1-1052.53

6.8.1-1052.53

ubuntu/linux-realtime-6.14*

ubuntu/linux-realtime-6.17<6.17.0-1014.16~24.04.1

6.17.0-1014.16~24.04.1

ubuntu/linux-aws-fips<6.8.0-1057.60+fips1

6.8.0-1057.60+fips1

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

6.8.0-1059.65+fips1

ubuntu/linux-fips<6.8.0-124.124+fips1

6.8.0-124.124+fips1

ubuntu/linux-gcp-fips<6.8.0-1060.63+fips1

6.8.0-1060.63+fips1

ubuntu/linux<6.17.0-35.35

6.17.0-35.35

ubuntu/linux-aws<6.17.0-1017.17

6.17.0-1017.17

ubuntu/linux-azure<6.17.0-1017.17

6.17.0-1017.17

ubuntu/linux-azure-fde*

ubuntu/linux-gcp<6.17.0-1018.19

6.17.0-1018.19

ubuntu/linux-oracle<6.17.0-1016.16

6.17.0-1016.16

ubuntu/linux-raspi<6.17.0-1018.18

6.17.0-1018.18

ubuntu/linux-realtime<6.17.0-1014.16

6.17.0-1014.16

ubuntu/linux-riscv<6.17.0-35.35.1

6.17.0-35.35.1

ubuntu/linux<7.0.0-22.22

7.0.0-22.22

ubuntu/linux-aws<7.0.0-1006.6

7.0.0-1006.6

ubuntu/linux-azure<7.0.0-1007.7

7.0.0-1007.7

ubuntu/linux-azure-fde<7.0.0-1006.6

7.0.0-1006.6

ubuntu/linux-gcp<7.0.0-1005.5

7.0.0-1005.5

ubuntu/linux-ibm<7.0.0-1007.7

7.0.0-1007.7

ubuntu/linux-nvidia<7.0.0-1009.9

7.0.0-1009.9

ubuntu/linux-oem-7.0<7.0.0-1008.8

7.0.0-1008.8

ubuntu/linux-oracle<7.0.0-1005.5

7.0.0-1005.5

ubuntu/linux-raspi<7.0.0-1011.11

7.0.0-1011.11

ubuntu/linux-realtime<7.0.0-22.22.1

7.0.0-22.22.1

ubuntu/linux-riscv<7.0.0-22.22.1

7.0.0-22.22.1

ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.6.141.1-1
Upgrade
Upgrade debian/linux to a version that resolves this vulnerability.
Fixed in 6.12.86-1
Upgrade
Upgrade debian/linux to a version that resolves this vulnerability.
Fixed in 7.0.4-1
Upgrade
Upgrade linux/Kernel to a version that resolves this vulnerability.
Fixed in 6.6.140
Upgrade
Upgrade linux/Kernel to a version that resolves this vulnerability.
Fixed in 6.12.86
Upgrade
Upgrade linux/Kernel to a version that resolves this vulnerability.
Fixed in 6.18.27
Upgrade
Upgrade linux/Kernel to a version that resolves this vulnerability.
Fixed in 7.0.4
Upgrade
Upgrade debian/linux to a version that resolves this vulnerability.
Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.116-1Fixed in 7.2.15-1Fixed in 7.3.3-1
Upgrade
Upgrade ubuntu/linux-aws-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1057.60~22.04.1
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Upgrade ubuntu/linux-azure-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1059.65~22.04.1
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Fixed in 6.8.0-1058.65~22.04.1
Upgrade
Upgrade ubuntu/linux-gcp-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1060.63~22.04.1
Upgrade
Upgrade ubuntu/linux-hwe-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-124.124~22.04.1
Upgrade
Upgrade ubuntu/linux-ibm-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1057.58~22.04.1
Upgrade
Upgrade ubuntu/linux-lowlatency-hwe-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-134.134.1~22.04.1
Upgrade
Upgrade ubuntu/linux-nvidia-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1055.58~22.04.1
Upgrade
Upgrade ubuntu/linux-oracle-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1054.55~22.04.1
Upgrade
Upgrade ubuntu/linux-riscv-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-124.124~22.04.1
Upgrade
Upgrade ubuntu/linux-realtime-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.1-1052.53~22.04.1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 6.8.0-124.124
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 6.8.0-1057.60
Upgrade
Upgrade ubuntu/linux-aws-6.17 to a version that resolves this vulnerability.
Fixed in 6.17.0-1017.17~24.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 6.8.0-1058.64
Upgrade
Upgrade ubuntu/linux-azure-6.17 to a version that resolves this vulnerability.
Fixed in 6.17.0-1017.17~24.04.1
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Upgrade ubuntu/linux-azure-fde to a version that resolves this vulnerability.
Fixed in 6.8.0-1058.65
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Upgrade ubuntu/linux-azure-nvidia to a version that resolves this vulnerability.
Fixed in 6.8.0-1039.42
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Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 6.8.0-1060.63
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Upgrade ubuntu/linux-gcp-6.17 to a version that resolves this vulnerability.
Fixed in 6.17.0-1018.19~24.04.1
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Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.
Fixed in 6.8.0-1055.61
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Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.
Fixed in 6.8.0-1042.45
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Upgrade ubuntu/linux-hwe-6.17 to a version that resolves this vulnerability.
Fixed in 6.17.0-35.35~24.04.1
Upgrade
Upgrade ubuntu/linux-hwe-7.0 to a version that resolves this vulnerability.
Fixed in 7.0.0-28.28~24.04.1
Upgrade
Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 6.8.0-1057.58
Upgrade
Upgrade ubuntu/linux-lowlatency to a version that resolves this vulnerability.
Fixed in 6.8.0-134.134.1
Upgrade
Upgrade ubuntu/linux-nvidia to a version that resolves this vulnerability.
Fixed in 6.8.0-1055.58
Upgrade
Upgrade ubuntu/linux-nvidia-6.17 to a version that resolves this vulnerability.
Fixed in 6.17.0-1021.21
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Fixed in 6.8.0-1055.58.1
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Fixed in 6.8.0-1026.26
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Upgrade ubuntu/linux-oem-6.17 to a version that resolves this vulnerability.
Fixed in 6.17.0-1024.24
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Fixed in 6.8.0-1054.55
Upgrade
Upgrade ubuntu/linux-oracle-6.17 to a version that resolves this vulnerability.
Fixed in 6.17.0-1016.16~24.04.1
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 6.8.0-1057.61
Upgrade
Upgrade ubuntu/linux-riscv-6.17 to a version that resolves this vulnerability.
Fixed in 6.17.0-35.35.1~24.04.1
Upgrade
Upgrade ubuntu/linux-xilinx to a version that resolves this vulnerability.
Fixed in 6.8.0-1032.33
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Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 6.8.0-1023.27
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Upgrade ubuntu/linux-raspi-realtime to a version that resolves this vulnerability.
Fixed in 6.8.0-2046.47
Upgrade
Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.
Fixed in 6.8.1-1052.53
Upgrade
Upgrade ubuntu/linux-realtime-6.17 to a version that resolves this vulnerability.
Fixed in 6.17.0-1014.16~24.04.1
Upgrade
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Fixed in 6.8.0-1057.60+fips1
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Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 6.8.0-1059.65+fips1
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Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 6.8.0-124.124+fips1
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 6.8.0-1060.63+fips1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 6.17.0-35.35
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Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 6.17.0-1017.17
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 6.17.0-1017.17
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 6.17.0-1018.19
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 6.17.0-1016.16
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 6.17.0-1018.18
Upgrade
Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.
Fixed in 6.17.0-1014.16
Upgrade
Upgrade ubuntu/linux-riscv to a version that resolves this vulnerability.
Fixed in 6.17.0-35.35.1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 7.0.0-22.22
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 7.0.0-1006.6
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 7.0.0-1007.7
Upgrade
Upgrade ubuntu/linux-azure-fde to a version that resolves this vulnerability.
Fixed in 7.0.0-1006.6
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 7.0.0-1005.5
Upgrade
Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 7.0.0-1007.7
Upgrade
Upgrade ubuntu/linux-nvidia to a version that resolves this vulnerability.
Fixed in 7.0.0-1009.9
Upgrade
Upgrade ubuntu/linux-oem-7.0 to a version that resolves this vulnerability.
Fixed in 7.0.0-1008.8
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 7.0.0-1005.5
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 7.0.0-1011.11
Upgrade
Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.
Fixed in 7.0.0-22.22.1
Upgrade
Upgrade ubuntu/linux-riscv to a version that resolves this vulnerability.
Fixed in 7.0.0-22.22.1

Event History

May 27, 2026

CVE Published

via OSV·12:00 AM

Data Sourced

via OSV·12:00 AM

DescriptionSeverityAffected Software

CVE Published

via MITRE·12:55 PM

Data Sourced

via MITRE·12:55 PM

Description

Data Sourced

via NVD·02:17 PM

RemedyDescriptionSeverityWeaknessAffected Software

Data Sourced

via Red Hat·03:07 PM

DescriptionSeverityAffected Software

May 28, 2026

Data Sourced

via Microsoft·08:11 AM

DescriptionSeverityWeakness

Data Sourced

via Microsoft·08:11 AM

Affected Software

Frequently Asked Questions

What access and privileges does exploitation require?

The CVSS vector indicates local access, low privileges, high attack complexity, and no user interaction. The impact is rated high for confidentiality, integrity, and availability.

Which products are identified as affected?

The listed affected software includes the Linux kernel and Microsoft azl3 kernel version 6.6.139.1-1.

CVE-2026-45998: rxrpc: Fix potential UAF after skb_unshare() failure

Affected Software

Remediation

Event History

Frequently Asked Questions

What access and privileges does exploitation require?

Which products are identified as affected?

Company

Resources

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