CVE-2026-53256: Bluetooth: RFCOMM: hold listener socket in rfcomm_connect_ind()

Q: What is the severity of CVE-2026-53256?

CVE-2026-53256 has a risk score of 53, indicating a moderate level of severity.

Q: What systems are affected by CVE-2026-53256?

CVE-2026-53256 affects the Bluetooth RFCOMM implementation within the Linux kernel.

Q: How do I fix CVE-2026-53256?

To fix CVE-2026-53256, users should apply the latest patches provided for the Linux kernel.

Q: What type of vulnerability is CVE-2026-53256?

CVE-2026-53256 is categorized as a Use After Free vulnerability.

Q: What are the potential impacts of CVE-2026-53256?

Exploitation of CVE-2026-53256 could lead to unauthorized access or manipulation of Bluetooth connections.

Published Jun 25, 2026

Updated

In multiple functions of sock.c, there is a possible use-after-free due to a race condition. This could lead to remote escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.

Other sources

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

Bluetooth: RFCOMM: hold listener socket in rfcommconnectind()

rfcommgetsockbychannel() scans rfcommsklist under the list lock, but returns the selected listener after dropping that lock without taking a reference. rfcommconnectind() then locks the listener, queues a child socket on it, and may notify it after unlocking it.

The buggy scenario involves two paths, with each column showing the order within that path:

rfcommconnectind(): listener close: 1. Find parent in 1. close() enters rfcommgetsockbychannel() rfcommsockrelease(). 2. Drop rfcommsklist.lock 2. rfcommsockshutdown() without pinning parent. closes the listener. 3. Call locksock(parent) and 3. rfcommsockkill() btacceptenqueue(parent, unlinks and puts parent. sk, true). 4. Read parent flags and may 4. parent can be freed. call skstatechange().

If close wins the race, parent can be freed before rfcommconnectind() reaches locksock(), btacceptenqueue(), or the deferred-setup callback.

Take a reference on the listener before leaving rfcommsklist.lock. After locksock() succeeds, recheck that it is still in BTLISTEN before queueing a child, cache the deferred-setup bit while the parent is locked, and drop the reference after the last parent use.

KASAN reported a slab-use-after-free in locksocknested() from rfcommconnectind(), with the freeing stack going through rfcommsockkill() and rfcommsockrelease().

— MITRE

Affected Software

291 affected componentsFixes available

Linux Linux kernel (Bluetooth RFCOMM)

Linux Linux kernel>=2.6.12.1<5.10.259

Linux Linux kernel>=5.11<5.15.210

Linux Linux kernel>=5.16<6.1.176

Linux Linux kernel>=6.2<6.6.143

Linux Linux kernel>=6.7<6.12.94

Linux Linux kernel>=6.13<6.18.36

Linux Linux kernel>=6.19<7.0.13

Linux Linux kernel=2.6.12

Linux Linux kernel=2.6.12-rc2

Linux Linux kernel=2.6.12-rc3

Linux Linux kernel=2.6.12-rc4

Linux Linux kernel=2.6.12-rc5

Linux Linux kernel=7.1-rc1

Linux Linux kernel=7.1-rc2

Linux Linux kernel=7.1-rc3

Linux Linux kernel=7.1-rc4

Linux Linux kernel=7.1-rc5

Linux Linux kernel=7.1-rc6

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*

ubuntu/linux-aws-5.13*

ubuntu/linux-aws-5.15<5.15.0-1117.124~20.04.1

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ubuntu/linux-aws-5.8*

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ubuntu/linux-azure-5.11*

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ubuntu/linux-azure-5.15<5.15.0-1123.132~20.04.1

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ubuntu/linux-azure-5.8*

ubuntu/linux-azure-fde*

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

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

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ubuntu/linux-gcp-5.8*

ubuntu/linux-gke*

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ubuntu/linux-hwe-5.8*

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ubuntu/linux-ibm-5.15<5.15.0-1111.115~20.04.1

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ubuntu/linux-intel-5.13*

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-lowlatency-hwe-5.15<5.15.0-195.205~20.04.1

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ubuntu/linux-nvidia-tegra-5.15*

ubuntu/linux-oem-5.10*

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ubuntu/linux-oracle-5.8*

ubuntu/linux-raspi*

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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<5.15.0-198.208

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ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws<5.15.0-1117.124

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ubuntu/linux-azure<5.15.0-1123.132

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ubuntu/linux-azure-5.19*

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ubuntu/linux-azure-6.8<6.8.0-1070.78~22.04.1

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ubuntu/linux-azure-fde<5.15.0-1122.131

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ubuntu/linux-azure-fde-5.19*

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ubuntu/linux-gcp<5.15.0-1118.128

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ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

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ubuntu/linux-gcp-6.8<6.8.0-1070.78~22.04.1

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ubuntu/linux-gke<5.15.0-1113.119

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ubuntu/linux-gkeop<5.15.0-1100.108

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ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-hwe-6.5*

ubuntu/linux-ibm<5.15.0-1111.115

5.15.0-1111.115

ubuntu/linux-ibm-6.8<6.8.0-1066.67~22.04.1

6.8.0-1066.67~22.04.1

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-intel-iotg<5.15.0-1112.118

5.15.0-1112.118

ubuntu/linux-kvm<5.15.0-1109.114

5.15.0-1109.114

ubuntu/linux-lowlatency<5.15.0-195.205

5.15.0-195.205

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-lowlatency-hwe-6.8<6.8.0-146.146.1~22.04.1

6.8.0-146.146.1~22.04.1

ubuntu/linux-nvidia<5.15.0-1112.113

5.15.0-1112.113

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

ubuntu/linux-nvidia-6.8<6.8.0-1064.67~22.04.1

6.8.0-1064.67~22.04.1

ubuntu/linux-nvidia-tegra*

ubuntu/linux-nvidia-tegra-igx*

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oem-6.5*

ubuntu/linux-oracle<5.15.0-1114.120

5.15.0-1114.120

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<6.8.0-146.146~22.04.1

6.8.0-146.146~22.04.1

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

ubuntu/linux-xilinx-zynqmp<5.15.0-1080.84

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<6.8.1-1061.62~22.04.1

6.8.1-1061.62~22.04.1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

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

5.15.0-1117.124+fips1

ubuntu/linux-azure-fips<5.15.0-1123.132+fips1

5.15.0-1123.132+fips1

ubuntu/linux-fips<5.15.0-198.208+fips1

5.15.0-198.208+fips1

ubuntu/linux-gcp-fips<5.15.0-1118.128+fips1

5.15.0-1118.128+fips1

ubuntu/linux<6.8.0-146.146

6.8.0-146.146

ubuntu/linux-aws<6.8.0-1066.69

6.8.0-1066.69

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<6.8.0-1070.78

6.8.0-1070.78

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<6.8.0-1068.75

6.8.0-1068.75

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<6.8.0-1070.78

6.8.0-1070.78

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<6.8.0-1065.73

6.8.0-1065.73

ubuntu/linux-gkeop<6.8.0-1051.55

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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<6.8.0-1066.67

6.8.0-1066.67

ubuntu/linux-lowlatency<6.8.0-146.146.1

6.8.0-146.146.1

ubuntu/linux-lowlatency-hwe-6.11*

ubuntu/linux-nvidia<6.8.0-1064.67

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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<6.8.0-1064.67.1

6.8.0-1064.67.1

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<6.8.0-1063.66

6.8.0-1063.66

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-xilinx*

ubuntu/linux-bluefield<6.8.0-1032.37

6.8.0-1032.37

ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime<6.8.1-1061.62

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ubuntu/linux-realtime-6.14*

ubuntu/linux-realtime-6.17*

ubuntu/linux-aws-fips<6.8.0-1066.69+fips1

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ubuntu/linux-azure-fips<6.8.0-1069.77+fips1

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ubuntu/linux-fips<6.8.0-146.146+fips1

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ubuntu/linux-gcp-fips<6.8.0-1070.78+fips1

6.8.0-1070.78+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*

ubuntu/linux<7.0.0-31.31

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ubuntu/linux-aws<7.0.0-1012.12

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ubuntu/linux-azure<7.0.0-1014.14

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ubuntu/linux-azure-fde<7.0.0-1013.13

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ubuntu/linux-gcp<7.0.0-1011.11

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ubuntu/linux-gke<7.0.0-1006.7

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ubuntu/linux-ibm<7.0.0-1013.13

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ubuntu/linux-nvidia<7.0.0-1018.18

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ubuntu/linux-nvidia-bos<7.0.0-2018.18

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ubuntu/linux-oracle<7.0.0-1011.11

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ubuntu/linux-raspi<7.0.0-1019.19

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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

android/:linux_kernel:>=:0<:2026-11-05

:2026-11-05

linux/kernel>=2.6.12<5.10.259

5.10.259

linux/kernel>=5.11.0<5.15.210

5.15.210

linux/kernel>=5.16.0<6.1.176

6.1.176

linux/kernel>=6.2.0<6.6.143

6.6.143

linux/kernel>=6.7.0<6.12.94

6.12.94

linux/kernel>=6.13.0<6.18.36

6.18.36

linux/kernel>=6.19.0<7.0.13

7.0.13

Google Android

Remediation

Recommended actions to resolve this vulnerability, in priority order.

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Fixed in 7.0.0-1014.14~24.04.1
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Fixed in 6.8.0-1068.75
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Fixed in 7.0.0-1013.13~24.04.1
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Fixed in 6.8.0-1070.78
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Fixed in 7.0.0-1011.11~24.04.1
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Fixed in 6.8.0-1065.73
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Fixed in 6.8.0-1051.55
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Fixed in 7.0.0-31.31~24.04.1
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Fixed in 6.8.0-1066.67
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Fixed in 6.8.0-146.146.1
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Fixed in 6.8.0-1064.67
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Fixed in 7.0.0-1018.18~24.04.1
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Fixed in 6.8.0-1064.67.1
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Fixed in 6.8.0-1035.38
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Fixed in 6.8.0-1063.66
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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 6.8.0-1032.37
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Fixed in 6.8.1-1061.62
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Fixed in 6.8.0-1066.69+fips1
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Fixed in 6.8.0-1069.77+fips1
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Fixed in 6.8.0-146.146+fips1
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Fixed in 6.8.0-1070.78+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
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Fixed in 7.0.0-31.31.1
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Fixed in 7.0.0-31.31.1
Compensating control
In rfcomm_connect_ind(), take a reference on the listener before leaving rfcomm_sk_list.lock, lock the parent socket, recheck that it remains in BT_LISTEN before queueing a child, cache the deferred-setup bit while the parent is locked, and drop the reference after the last parent use.

Event History

Jun 25, 2026

CVE Published

via MITRE·08:39 AM

Data Sourced

via MITRE·08:39 AM

DescriptionSeverity

Data Sourced

via OSV·08:39 AM

DescriptionSeverityAffected Software

Data Sourced

via NVD·09:16 AM

RemedyDescriptionSeverityWeaknessAffected Software

Nov 1, 2026

Advisory Published

via OSV·12:00 AM

Nov 2, 2026

Data Sourced

via Android·12:00 AM

SeverityWeaknessAffected Software

Frequently Asked Questions

What is the severity of CVE-2026-53256?

CVE-2026-53256 has a risk score of 53, indicating a moderate level of severity.

What systems are affected by CVE-2026-53256?

CVE-2026-53256 affects the Bluetooth RFCOMM implementation within the Linux kernel.

How do I fix CVE-2026-53256?

To fix CVE-2026-53256, users should apply the latest patches provided for the Linux kernel.

What type of vulnerability is CVE-2026-53256?

CVE-2026-53256 is categorized as a Use After Free vulnerability.

What are the potential impacts of CVE-2026-53256?

Exploitation of CVE-2026-53256 could lead to unauthorized access or manipulation of Bluetooth connections.

CVE-2026-53256: Bluetooth: RFCOMM: hold listener socket in rfcomm_connect_ind()

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Affected Software

Remediation

Event History

Frequently Asked Questions

What is the severity of CVE-2026-53256?

What systems are affected by CVE-2026-53256?

How do I fix CVE-2026-53256?

What type of vulnerability is CVE-2026-53256?

What are the potential impacts of CVE-2026-53256?

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