CVE-2023-52438: binder: fix use-after-free in shinker's callback

Published Feb 20, 2024

Updated

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

binder: fix use-after-free in shinker's callback

The mmap read lock is used during the shrinker's callback, which means that using alloc->vma pointer isn't safe as it can race with munmap(). As of commit dd2283f2605e ("mm: mmap: zap pages with read mmapsem in munmap") the mmap lock is downgraded after the vma has been isolated.

I was able to reproduce this issue by manually adding some delays and triggering page reclaiming through the shrinker's debug sysfs. The following KASAN report confirms the UAF:

================================================================== BUG: KASAN: slab-use-after-free in zappagerangesingle+0x470/0x4b8 Read of size 8 at addr ffff356ed50e50f0 by task bash/478

CPU: 1 PID: 478 Comm: bash Not tainted 6.6.0-rc5-00055-g1c8b86a3799f-dirty #70 Hardware name: linux,dummy-virt (DT) Call trace: zappagerangesingle+0x470/0x4b8 binderallocfreepage+0x608/0xadc listlruwalkone+0x130/0x3b0 listlruwalknode+0xc4/0x22c bindershrinkscan+0x108/0x1dc shrinkerdebugfsscanwrite+0x2b4/0x500 fullproxywrite+0xd4/0x140 vfswrite+0x1ac/0x758 ksyswrite+0xf0/0x1dc arm64syswrite+0x6c/0x9c

Allocated by task 492: kmemcachealloc+0x130/0x368 vmareaalloc+0x2c/0x190 mmapregion+0x258/0x18bc dommap+0x694/0xa60 vmmmappgoff+0x170/0x29c ksysmmappgoff+0x290/0x3a0 arm64sysmmap+0xcc/0x144

Freed by task 491: kmemcachefree+0x17c/0x3c8 vmareafreercucb+0x74/0x98 rcucore+0xa38/0x26d4 rcucoresi+0x10/0x1c dosoftirq+0x2fc/0xd24

Last potentially related work creation: callrcucommon.constprop.0+0x6c/0xba0 callrcu+0x10/0x1c vmareafree+0x18/0x24 removevma+0xe4/0x118 dovmialignmunmap.isra.0+0x718/0xb5c dovmimunmap+0xdc/0x1fc vmmunmap+0x10c/0x278 arm64sysmunmap+0x58/0x7c

Fix this issue by performing instead a vmalookup() which will fail to find the vma that was isolated before the mmap lock downgrade. Note that this option has better performance than upgrading to a mmap write lock which would increase contention. Plus, mmapwritetrylock() has been recently removed anyway.

Affected Software

149 affected componentsFixes available

Linux Linux kernel>=4.20.0<5.4.268

Linux Linux kernel>=5.5.0<5.10.209

Linux Linux kernel>=5.11.0<5.15.148

Linux Linux kernel>=5.16.0<6.1.74

Linux Linux kernel>=6.2.0<6.6.13

Linux Linux kernel>=6.7.0<6.7.1

debian/linux

5.10.223-15.10.234-16.1.129-16.1.135-16.12.25-1

ubuntu/linux-hwe-edge*

ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-aws-5.4<5.4.0-1122.132~18.04.1

5.4.0-1122.132~18.04.1

ubuntu/linux-azure*

ubuntu/linux-azure-5.3*

ubuntu/linux-azure-5.4<5.4.0-1127.134~18.04.1

5.4.0-1127.134~18.04.1

ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

ubuntu/linux-gcp-5.3*

ubuntu/linux-gcp-5.4<5.4.0-1126.135~18.04.1

5.4.0-1126.135~18.04.1

ubuntu/linux-gke-4.15*

ubuntu/linux-gke-5.4*

ubuntu/linux-gkeop-5.4*

ubuntu/linux-hwe*

ubuntu/linux-hwe-5.4<5.4.0-175.195~18.04.1

5.4.0-175.195~18.04.1

ubuntu/linux-hwe-edge*

ubuntu/linux-ibm-5.4<5.4.0-1069.74~18.04.1

5.4.0-1069.74~18.04.1

ubuntu/linux-oem*

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux-oracle-5.4<5.4.0-1121.130~18.04.1

5.4.0-1121.130~18.04.1

ubuntu/linux-raspi-5.4<5.4.0-1106.118~18.04.1

5.4.0-1106.118~18.04.1

ubuntu/linux<5.4.0-176.196

5.4.0-176.196

ubuntu/linux-aws<5.4.0-1122.132

5.4.0-1122.132

ubuntu/linux-aws-5.15<5.15.0-1057.63~20.04.1

5.15.0-1057.63~20.04.1

ubuntu/linux-azure<5.4.0-1127.134

5.4.0-1127.134

ubuntu/linux-azure-5.15<5.15.0-1060.69~20.04.1

5.15.0-1060.69~20.04.1

ubuntu/linux-bluefield<5.4.0-1082.89

5.4.0-1082.89

ubuntu/linux-gcp<5.4.0-1126.135

5.4.0-1126.135

ubuntu/linux-gcp-5.15<5.15.0-1055.63~20.04.1

5.15.0-1055.63~20.04.1

ubuntu/linux-gkeop<5.4.0-1089.93

5.4.0-1089.93

ubuntu/linux-gkeop-5.15<5.15.0-1040.46~20.04.1

5.15.0-1040.46~20.04.1

ubuntu/linux-hwe-5.15<5.15.0-102.112~20.04.1

5.15.0-102.112~20.04.1

ubuntu/linux-ibm<5.4.0-1069.74

5.4.0-1069.74

ubuntu/linux-ibm-5.15<5.15.0-1050.53~20.04.1

5.15.0-1050.53~20.04.1

ubuntu/linux-intel-iotg-5.15<5.15.0-1052.58~20.04.1

5.15.0-1052.58~20.04.1

ubuntu/linux-iot<5.4.0-1034.35

5.4.0-1034.35

ubuntu/linux-kvm<5.4.0-1110.117

5.4.0-1110.117

ubuntu/linux-lowlatency-hwe-5.15<5.15.0-102.112~20.04.1

5.15.0-102.112~20.04.1

ubuntu/linux-nvidia-tegra-5.15<5.15.0-1025.25~20.04.1

5.15.0-1025.25~20.04.1

ubuntu/linux-oracle<5.4.0-1121.130

5.4.0-1121.130

ubuntu/linux-oracle-5.15<5.15.0-1055.61~20.04.1

5.15.0-1055.61~20.04.1

ubuntu/linux-raspi<5.4.0-1106.118

5.4.0-1106.118

ubuntu/linux-riscv-5.15<5.15.0-1053.57~20.04.1

5.15.0-1053.57~20.04.1

ubuntu/linux-xilinx-zynqmp<5.4.0-1041.45

5.4.0-1041.45

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-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-aws-fips<5.4.0-1122.132+fips1

5.4.0-1122.132+fips1

ubuntu/linux-azure-fips<5.4.0-1127.134+fips1

5.4.0-1127.134+fips1

ubuntu/linux-fips<5.4.0-1096.106

5.4.0-1096.106

ubuntu/linux-gcp-fips<5.4.0-1126.135+fips1

5.4.0-1126.135+fips1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.15.0-102.112

5.15.0-102.112

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws<5.15.0-1057.63

5.15.0-1057.63

ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-aws-6.5*

ubuntu/linux-azure<5.15.0-1060.69

5.15.0-1060.69

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-6.5*

ubuntu/linux-azure-fde<5.15.0-1060.69.1

5.15.0-1060.69.1

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-gcp<5.15.0-1055.63

5.15.0-1055.63

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-gcp-6.5*

ubuntu/linux-gke<5.15.0-1054.59

5.15.0-1054.59

ubuntu/linux-gkeop<5.15.0-1040.46

5.15.0-1040.46

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-hwe-6.5*

ubuntu/linux-ibm<5.15.0-1050.53

5.15.0-1050.53

ubuntu/linux-intel-iotg<5.15.0-1052.58

5.15.0-1052.58

ubuntu/linux-kvm<5.15.0-1054.59

5.15.0-1054.59

ubuntu/linux-lowlatency<5.15.0-102.112

5.15.0-102.112

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-nvidia<5.15.0-1048.48

5.15.0-1048.48

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5<6.5.0-1014.14

6.5.0-1014.14

ubuntu/linux-nvidia-tegra<5.15.0-1025.25

5.15.0-1025.25

ubuntu/linux-nvidia-tegra-igx<5.15.0-1012.12

5.15.0-1012.12

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1<6.1.0-1035.35

6.1.0-1035.35

ubuntu/linux-oem-6.5*

ubuntu/linux-oracle<5.15.0-1055.61

5.15.0-1055.61

ubuntu/linux-oracle-6.5*

ubuntu/linux-raspi<5.15.0-1050.53

5.15.0-1050.53

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-riscv-6.5*

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

ubuntu/linux-xilinx-zynqmp<5.15.0-1030.34

5.15.0-1030.34

ubuntu/linux-bluefield<5.15.0-1040.42

5.15.0-1040.42

ubuntu/linux-intel-iot-realtime<5.15.0-1050.52

5.15.0-1050.52

ubuntu/linux-realtime<5.15.0-1058.66

5.15.0-1058.66

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips<5.15.0-1057.63+fips1

5.15.0-1057.63+fips1

ubuntu/linux-azure-fips<5.15.0-1060.69+fips1

5.15.0-1060.69+fips1

ubuntu/linux-fips<5.15.0-102.112+fips1

5.15.0-102.112+fips1

ubuntu/linux-gcp-fips<5.15.0-1055.63+fips2

5.15.0-1055.63+fips2

ubuntu/linux-raspi-realtime<6.8.0-2001.1

6.8.0-2001.1

ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade debian/linux to a version that resolves this vulnerability.
Fixed in 5.10.223-1Fixed in 5.10.234-1Fixed in 6.1.129-1Fixed in 6.1.135-1Fixed in 6.12.25-1
Upgrade
Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1122.132~18.04.1
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Fixed in 5.4.0-1127.134~18.04.1
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Fixed in 5.4.0-1126.135~18.04.1
Upgrade
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Fixed in 5.4.0-175.195~18.04.1
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Fixed in 5.4.0-1069.74~18.04.1
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Fixed in 5.4.0-1121.130~18.04.1
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Fixed in 5.4.0-1106.118~18.04.1
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Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.4.0-176.196
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Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.4.0-1122.132
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Upgrade ubuntu/linux-aws-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1057.63~20.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.4.0-1127.134
Upgrade
Upgrade ubuntu/linux-azure-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1060.69~20.04.1
Upgrade
Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 5.4.0-1082.89
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.4.0-1126.135
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Upgrade ubuntu/linux-gcp-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1055.63~20.04.1
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Fixed in 5.4.0-1089.93
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Fixed in 5.15.0-1040.46~20.04.1
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Fixed in 5.15.0-102.112~20.04.1
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Fixed in 5.4.0-1069.74
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Fixed in 5.15.0-1050.53~20.04.1
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Upgrade ubuntu/linux-intel-iotg-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1052.58~20.04.1
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Fixed in 5.4.0-1034.35
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Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.4.0-1110.117
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Upgrade ubuntu/linux-lowlatency-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-102.112~20.04.1
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Fixed in 5.15.0-1025.25~20.04.1
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Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 5.4.0-1121.130
Upgrade
Upgrade ubuntu/linux-oracle-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1055.61~20.04.1
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Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 5.4.0-1106.118
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Upgrade ubuntu/linux-riscv-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1053.57~20.04.1
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Fixed in 5.4.0-1041.45
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Fixed in 5.4.0-1122.132+fips1
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Fixed in 5.4.0-1127.134+fips1
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Fixed in 5.4.0-1096.106
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Fixed in 5.4.0-1126.135+fips1
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Fixed in 5.15.0-102.112
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Fixed in 5.15.0-1057.63
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Fixed in 5.15.0-1060.69
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Fixed in 5.15.0-1060.69.1
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Fixed in 5.15.0-1055.63
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Fixed in 5.15.0-1054.59
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Fixed in 5.15.0-1040.46
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Fixed in 5.15.0-1050.53
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Fixed in 5.15.0-1052.58
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Fixed in 5.15.0-1054.59
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Fixed in 5.15.0-102.112
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Fixed in 5.15.0-1048.48
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Fixed in 6.5.0-1014.14
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Fixed in 5.15.0-1025.25
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Fixed in 5.15.0-1012.12
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Fixed in 6.1.0-1035.35
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Fixed in 5.15.0-1055.61
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Fixed in 5.15.0-1050.53
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Fixed in 5.15.0-1030.34
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Fixed in 5.15.0-1040.42
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Fixed in 5.15.0-1050.52
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Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.
Fixed in 5.15.0-1058.66
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Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-1057.63+fips1
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Fixed in 5.15.0-1060.69+fips1
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Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 5.15.0-102.112+fips1
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Fixed in 5.15.0-1055.63+fips2
Upgrade
Upgrade ubuntu/linux-raspi-realtime to a version that resolves this vulnerability.
Fixed in 6.8.0-2001.1
Upgrade
Upgrade Linux kernel to a version that resolves this vulnerability.
Patch binder: fix use-after-free in shinker's callback
Configuration
Apply the kernel change that avoids using alloc->vma during the shrinker callback when only the mmap read lock is held; instead perform a vma_lookup() which will fail to find the vma that was isolated before the mmap lock downgrade.
Linux kernel mmap locking mmap read lock usage during shrinker callback = use vma_lookup() failure path instead of alloc->vma pointer

Event History

Feb 20, 2024

CVE Published

via MITRE·06:34 PM

Data Sourced

via MITRE·06:34 PM

DescriptionSeverity

Data Sourced

via OSV·09:15 PM

DescriptionSeverityAffected Software

Data Sourced

via NVD·09:15 PM

RemedyDescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

What is the severity of CVE-2023-52438?

CVE-2023-52438 is classified as a medium severity vulnerability affecting the Linux kernel.

How do I fix CVE-2023-52438?

To fix CVE-2023-52438, update your Linux kernel to a patched version such as 5.10.223-1 or 6.1.123-1.

Which Linux kernel versions are affected by CVE-2023-52438?

CVE-2023-52438 affects Linux kernel versions from 4.20.0 up to 6.7.0, excluding newer versions.

What type of vulnerability is CVE-2023-52438?

CVE-2023-52438 is a use-after-free vulnerability in the binder subsystem of the Linux kernel.

Can CVE-2023-52438 lead to system crashes?

Yes, CVE-2023-52438 can potentially lead to system crashes or instability due to improper memory handling.

CVE-2023-52438: binder: fix use-after-free in shinker's callback

Affected Software

Remediation

Event History

Frequently Asked Questions

What is the severity of CVE-2023-52438?

How do I fix CVE-2023-52438?

Which Linux kernel versions are affected by CVE-2023-52438?

What type of vulnerability is CVE-2023-52438?

Can CVE-2023-52438 lead to system crashes?

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