CVE-2026-63800: pNFS: Fix use-after-free in pnfs_update_layout()

Q: What is the severity of CVE-2026-63800?

CVE-2026-63800 has a critical severity score of 9.8 according to the CVSS 3.1 metrics.

Q: How do I fix CVE-2026-63800?

To fix CVE-2026-63800, you should update your Linux Kernel to the latest version that includes the patch for this vulnerability.

Q: What type of vulnerability is CVE-2026-63800?

CVE-2026-63800 is classified as a use-after-free vulnerability affecting the pNFS subsystem in the Linux Kernel.

Q: What impact does CVE-2026-63800 have?

CVE-2026-63800 can lead to potential data corruption, crashes, or arbitrary code execution due to improper memory management.

Q: When was CVE-2026-63800 published?

CVE-2026-63800 was published on July 19, 2026.

Published Jul 19, 2026

Updated

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

pNFS: Fix use-after-free in pnfsupdatelayout()

When hitting the NFSLAYOUTRETURN branch in pnfsupdatelayout(), the code calls pnfspreparetoretrylayoutget(lo). If it succeeds, pnfsputlayouthdr(lo) is called before tracepnfsupdatelayout(), which still references 'lo'. This results in a use-after-free when the tracepoint accesses lo's fields.

Fix this by moving the tracepoint call before pnfsputlayouthdr(lo).

Affected Software

239 affected componentsFixes available

Linux Kernel

Microsoft azl3 kernel 6.6.143.1-1<6.6.150.1-1

6.6.150.1-1

Linux Linux kernel>=5.4.91<5.5

Linux Linux kernel>=5.10.9<5.10.260

Linux Linux kernel>=5.11.1<5.15.211

Linux Linux kernel>=5.16<6.1.177

Linux Linux kernel>=6.2<6.6.144

Linux Linux kernel>=6.7<6.12.95

Linux Linux kernel>=6.13<6.18.38

Linux Linux kernel>=6.19<7.1.3

Linux Linux kernel=5.11

Linux Linux kernel=5.11-rc4

Linux Linux kernel=5.11-rc5

Linux Linux kernel=5.11-rc6

Linux Linux kernel=5.11-rc7

ubuntu/linux-hwe-edge*

ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-aws-5.4*

ubuntu/linux-azure*

ubuntu/linux-azure-5.3*

ubuntu/linux-azure-5.4*

ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

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-oem*

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux-oracle-5.4*

ubuntu/linux-raspi-5.4*

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-aws-5.11*

ubuntu/linux-aws-5.13*

ubuntu/linux-aws-5.15<5.15.0-1116.123~20.04.1

5.15.0-1116.123~20.04.1

ubuntu/linux-aws-5.8*

ubuntu/linux-azure*

ubuntu/linux-azure-5.11*

ubuntu/linux-azure-5.13*

ubuntu/linux-azure-5.15<5.15.0-1122.131~20.04.1

5.15.0-1122.131~20.04.1

ubuntu/linux-azure-5.8*

ubuntu/linux-azure-fde*

ubuntu/linux-azure-fde-5.15<5.15.0-1121.130~20.04.1

5.15.0-1121.130~20.04.1

ubuntu/linux-bluefield*

ubuntu/linux-gcp*

ubuntu/linux-gcp-5.11*

ubuntu/linux-gcp-5.13*

ubuntu/linux-gcp-5.15<5.15.0-1118.128~20.04.1

5.15.0-1118.128~20.04.1

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<5.15.0-194.204~20.04.1

5.15.0-194.204~20.04.1

ubuntu/linux-hwe-5.8*

ubuntu/linux-ibm*

ubuntu/linux-ibm-5.15<5.15.0-1110.114~20.04.1

5.15.0-1110.114~20.04.1

ubuntu/linux-intel-5.13*

ubuntu/linux-intel-iotg-5.15<5.15.0-1111.117~20.04.1

5.15.0-1111.117~20.04.1

ubuntu/linux-iot*

ubuntu/linux-kvm*

ubuntu/linux-lowlatency-hwe-5.15<5.15.0-194.204~20.04.1

5.15.0-194.204~20.04.1

ubuntu/linux-nvidia-tegra-5.15<5.15.0-1068.70~20.04.1

5.15.0-1068.70~20.04.1

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<5.15.0-1114.120~20.04.1

5.15.0-1114.120~20.04.1

ubuntu/linux-oracle-5.8*

ubuntu/linux-raspi*

ubuntu/linux-raspi2*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.11*

ubuntu/linux-riscv-5.15<5.15.0-1110.114~20.04.1

5.15.0-1110.114~20.04.1

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-fips*

ubuntu/linux<5.15.0-194.204

5.15.0-194.204

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws<5.15.0-1116.123

5.15.0-1116.123

ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-aws-6.5*

ubuntu/linux-aws-6.8*

ubuntu/linux-azure<5.15.0-1122.131

5.15.0-1122.131

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-6.5*

ubuntu/linux-azure-6.8*

ubuntu/linux-azure-fde<5.15.0-1121.130

5.15.0-1121.130

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-azure-fde-6.8*

ubuntu/linux-gcp<5.15.0-1117.127

5.15.0-1117.127

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-gcp-6.5*

ubuntu/linux-gcp-6.8*

ubuntu/linux-gke<5.15.0-1112.118

5.15.0-1112.118

ubuntu/linux-gkeop<5.15.0-1099.107

5.15.0-1099.107

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-hwe-6.5*

ubuntu/linux-ibm<5.15.0-1110.114

5.15.0-1110.114

ubuntu/linux-ibm-6.8*

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-intel-iotg<5.15.0-1111.117

5.15.0-1111.117

ubuntu/linux-kvm<5.15.0-1108.113

5.15.0-1108.113

ubuntu/linux-lowlatency<5.15.0-194.204

5.15.0-194.204

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<5.15.0-1111.112

5.15.0-1111.112

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

ubuntu/linux-nvidia-6.8*

ubuntu/linux-nvidia-tegra<5.15.0-1068.70

5.15.0-1068.70

ubuntu/linux-nvidia-tegra-igx<5.15.0-1057.57

5.15.0-1057.57

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oem-6.5*

ubuntu/linux-oracle<5.15.0-1113.119

5.15.0-1113.119

ubuntu/linux-oracle-6.5*

ubuntu/linux-oracle-6.8*

ubuntu/linux-raspi<5.15.0-1110.113

5.15.0-1110.113

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<5.15.0-1079.83

5.15.0-1079.83

ubuntu/linux-bluefield<5.15.0-1100.102

5.15.0-1100.102

ubuntu/linux-intel-iot-realtime<5.15.0-1108.110

5.15.0-1108.110

ubuntu/linux-realtime<5.15.0-1115.124

5.15.0-1115.124

ubuntu/linux-realtime-6.8*

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips<5.15.0-1116.123+fips1

5.15.0-1116.123+fips1

ubuntu/linux-azure-fips<5.15.0-1122.131+fips1

5.15.0-1122.131+fips1

ubuntu/linux-fips<5.15.0-194.204+fips1

5.15.0-194.204+fips1

ubuntu/linux-gcp-fips<5.15.0-1116.126+fips1

5.15.0-1116.126+fips1

ubuntu/linux<6.8.0-147.147

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<7.0.0-1012.12~24.04.1

7.0.0-1012.12~24.04.1

ubuntu/linux-azure<6.8.0-1071.79

6.8.0-1071.79

ubuntu/linux-azure-6.11*

ubuntu/linux-azure-6.14*

ubuntu/linux-azure-6.17*

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

7.0.0-1014.14~24.04.1

ubuntu/linux-azure-fde<6.8.0-1069.76

6.8.0-1069.76

ubuntu/linux-azure-fde-6.14*

ubuntu/linux-azure-fde-6.17*

ubuntu/linux-azure-fde-7.0<7.0.0-1013.13~24.04.1

7.0.0-1013.13~24.04.1

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<7.0.0-1011.11~24.04.1

7.0.0-1011.11~24.04.1

ubuntu/linux-gke<6.8.0-1066.74

6.8.0-1066.74

ubuntu/linux-gkeop<6.8.0-1052.56

6.8.0-1052.56

ubuntu/linux-hwe-6.11*

ubuntu/linux-hwe-6.14*

ubuntu/linux-hwe-6.17*

ubuntu/linux-hwe-7.0<7.0.0-31.31~24.04.1

7.0.0-31.31~24.04.1

ubuntu/linux-ibm<6.8.0-1067.68

6.8.0-1067.68

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<7.0.0-1018.18~24.04.1

7.0.0-1018.18~24.04.1

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<7.0.0-1011.11~24.04.1

7.0.0-1011.11~24.04.1

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<7.0.0-31.31.1~24.04.1

7.0.0-31.31.1~24.04.1

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

6.8.0-1067.70+fips1

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<7.0.0-31.31

7.0.0-31.31

ubuntu/linux-aws<7.0.0-1012.12

7.0.0-1012.12

ubuntu/linux-azure<7.0.0-1014.14

7.0.0-1014.14

ubuntu/linux-azure-fde<7.0.0-1013.13

7.0.0-1013.13

ubuntu/linux-gcp<7.0.0-1011.11

7.0.0-1011.11

ubuntu/linux-gke<7.0.0-1006.7

7.0.0-1006.7

ubuntu/linux-ibm<7.0.0-1013.13

7.0.0-1013.13

ubuntu/linux-nvidia<7.0.0-1018.18

7.0.0-1018.18

ubuntu/linux-nvidia-bos<7.0.0-2018.18

7.0.0-2018.18

ubuntu/linux-oem-7.0<7.0.0-1013.13

7.0.0-1013.13

ubuntu/linux-oracle<7.0.0-1011.11

7.0.0-1011.11

ubuntu/linux-raspi<7.0.0-1019.19

7.0.0-1019.19

ubuntu/linux-realtime<7.0.0-31.31.1

7.0.0-31.31.1

ubuntu/linux-riscv<7.0.0-31.31.1

7.0.0-31.31.1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

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Fixed in 6.6.150.1-1
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Fixed in 5.15.0-1116.123~20.04.1
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Fixed in 5.15.0-1122.131~20.04.1
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Fixed in 5.15.0-1121.130~20.04.1
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Fixed in 5.15.0-1118.128~20.04.1
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Fixed in 5.15.0-194.204~20.04.1
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Fixed in 5.15.0-1110.114~20.04.1
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Fixed in 5.15.0-1111.117~20.04.1
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Fixed in 5.15.0-194.204~20.04.1
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Fixed in 5.15.0-1068.70~20.04.1
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Fixed in 5.15.0-1114.120~20.04.1
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Fixed in 5.15.0-1110.114~20.04.1
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Fixed in 5.15.0-194.204
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Fixed in 5.15.0-1116.123
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Fixed in 5.15.0-1122.131
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Fixed in 5.15.0-1121.130
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Fixed in 5.15.0-1117.127
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Fixed in 5.15.0-1112.118
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Fixed in 5.15.0-1099.107
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Fixed in 5.15.0-1110.114
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Fixed in 5.15.0-1111.117
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Fixed in 5.15.0-1108.113
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Fixed in 5.15.0-194.204
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Fixed in 5.15.0-1111.112
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Fixed in 5.15.0-1068.70
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Fixed in 5.15.0-1057.57
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Fixed in 5.15.0-1113.119
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Fixed in 5.15.0-1110.113
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Fixed in 5.15.0-1079.83
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Fixed in 5.15.0-1100.102
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Fixed in 5.15.0-1108.110
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Fixed in 5.15.0-1115.124
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Fixed in 5.15.0-1116.123+fips1
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Fixed in 5.15.0-1122.131+fips1
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Fixed in 5.15.0-194.204+fips1
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Fixed in 5.15.0-1116.126+fips1
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Fixed in 6.8.0-147.147
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Fixed in 6.8.0-1067.70
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Fixed in 7.0.0-1012.12~24.04.1
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Fixed in 6.8.0-1071.79
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Fixed in 7.0.0-1014.14~24.04.1
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Fixed in 6.8.0-1069.76
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Fixed in 7.0.0-1013.13~24.04.1
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Fixed in 6.8.0-1071.79
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Fixed in 7.0.0-1011.11~24.04.1
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Fixed in 6.8.0-1066.74
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Fixed in 6.8.0-1052.56
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Fixed in 7.0.0-31.31~24.04.1
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Fixed in 6.8.0-1067.68
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Fixed in 6.8.0-147.147.1
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Fixed in 7.0.0-1018.18~24.04.1
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Fixed in 6.8.0-1035.38
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Fixed in 6.8.0-1064.67
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Fixed in 7.0.0-1011.11~24.04.1
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Fixed in 7.0.0-31.31.1~24.04.1
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Fixed in 6.8.0-1008.8
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Fixed in 6.8.0-1033.38
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Fixed in 6.8.1-1062.63
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Fixed in 6.8.0-1067.70+fips1
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Fixed in 6.8.0-1071.79+fips1
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Fixed in 6.8.0-147.147+fips1
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Fixed in 6.8.0-1071.79+fips1
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Fixed in 7.0.0-31.31
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Fixed in 7.0.0-1012.12
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Fixed in 7.0.0-1014.14
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Fixed in 7.0.0-1013.13
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Fixed in 7.0.0-1011.11
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Fixed in 7.0.0-1006.7
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Fixed in 7.0.0-1013.13
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Fixed in 7.0.0-1018.18
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Fixed in 7.0.0-2018.18
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Fixed in 7.0.0-1013.13
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Fixed in 7.0.0-1011.11
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Fixed in 7.0.0-1019.19
Upgrade
Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.
Fixed in 7.0.0-31.31.1
Upgrade
Upgrade ubuntu/linux-riscv to a version that resolves this vulnerability.
Fixed in 7.0.0-31.31.1
Configuration
Move the trace_pnfs_update_layout() tracepoint call before pnfs_put_layout_hdr(lo) to prevent the tracepoint from accessing the freed lo object.
Linux kernel pNFS trace_pnfs_update_layout() call order = before pnfs_put_layout_hdr(lo)

Event History

Jul 19, 2026

CVE Published

via MITRE·12:02 PM

Data Sourced

via MITRE·12:02 PM

DescriptionSeverity

Data Sourced

via OSV·12:16 PM

DescriptionSeverityAffected Software

Data Sourced

via NVD·12:16 PM

RemedyDescriptionSeverityWeaknessAffected Software

Data Sourced

via Red Hat·01:02 PM

DescriptionSeverityAffected Software

Jul 20, 2026

Data Sourced

via Microsoft·08:06 AM

DescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

What is the severity of CVE-2026-63800?

CVE-2026-63800 has a critical severity score of 9.8 according to the CVSS 3.1 metrics.

How do I fix CVE-2026-63800?

To fix CVE-2026-63800, you should update your Linux Kernel to the latest version that includes the patch for this vulnerability.

What type of vulnerability is CVE-2026-63800?

CVE-2026-63800 is classified as a use-after-free vulnerability affecting the pNFS subsystem in the Linux Kernel.

What impact does CVE-2026-63800 have?

CVE-2026-63800 can lead to potential data corruption, crashes, or arbitrary code execution due to improper memory management.

When was CVE-2026-63800 published?

CVE-2026-63800 was published on July 19, 2026.

CVE-2026-63800: pNFS: Fix use-after-free in pnfs_update_layout()

Affected Software

Remediation

Event History

Frequently Asked Questions

What is the severity of CVE-2026-63800?

How do I fix CVE-2026-63800?

What type of vulnerability is CVE-2026-63800?

What impact does CVE-2026-63800 have?

When was CVE-2026-63800 published?

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