Use-after-free in Linux kernel - CVE-2026-53062

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Main Vulnerability Database Vulnerabilities #VU135271

Use-after-free in Linux kernel - CVE-2026-53062

Published: June 25, 2026


Vulnerability identifier: #VU135271
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-53062
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to use-after-free in the dm-cache smq policy invalidate_mapping operation when handling concurrent writes in passthrough mode. A local user can trigger concurrent cache block invalidations to cause a denial of service.

The issue occurs when the cache is operating in passthrough mode and multiple workers invalidate cache blocks simultaneously.


Affected software

Linux kernel
Red Hat Enterprise Linux for Real Time
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for x86_64
Ubuntu
kernel (Red Hat package)
kernel-rt (Red Hat package)
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-nvidia-tegra-5.15 (Ubuntu package)
linux-intel-iot-realtime (Ubuntu package)
linux-raspi (Ubuntu package)
linux-intel-iotg (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-5.15 (Ubuntu package)
linux-gcp-5.15 (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux-fips (Ubuntu package)
linux-hwe-6.8 (Ubuntu package)
linux-ibm (Ubuntu package)
linux-oracle-6.8 (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-azure-fde-6.8 (Ubuntu package)
linux-gcp-fips (Ubuntu package)
kernel-zfcpdump-core (Red Hat package)
python3-perf (Red Hat package)
rtla (Red Hat package)
rv (Red Hat package)
kernel-debuginfo-common-s390x (Red Hat package)
kernel-zfcpdump (Red Hat package)
kernel-tools-debuginfo (Red Hat package)
kernel-zfcpdump-devel (Red Hat package)
kernel-zfcpdump-devel-matched (Red Hat package)
kernel-zfcpdump-modules (Red Hat package)
perf (Red Hat package)
kernel-uki-virt-addons (Red Hat package)
kernel-uki-virt (Red Hat package)
kernel-tools-libs (Red Hat package)
kernel-64k-debug-devel-matched (Red Hat package)
kernel-tools (Red Hat package)
kernel-rt-modules-extra (Red Hat package)
kernel-rt-modules-core (Red Hat package)
kernel-rt-modules (Red Hat package)
kernel-rt-devel (Red Hat package)
kernel-rt-64k (Red Hat package)
kernel-rt-64k-debuginfo (Red Hat package)
kernel-rt-64k-debug-modules-extra (Red Hat package)
kernel-rt-64k-debug-modules-core (Red Hat package)
kernel-rt-64k-debug-modules (Red Hat package)
kernel-rt-64k-debug-devel (Red Hat package)
kernel-rt-64k-debug-debuginfo (Red Hat package)
kernel-rt-64k-debug-core (Red Hat package)
kernel-rt-64k-debug (Red Hat package)
kernel-rt-64k-core (Red Hat package)
kernel-zfcpdump-modules-core (Red Hat package)
kernel-debuginfo-common-aarch64 (Red Hat package)
kernel-64k-devel-matched (Red Hat package)
kernel-64k-devel (Red Hat package)
kernel-64k-debuginfo (Red Hat package)
kernel-rt-debug-devel (Red Hat package)
kernel-64k-debug-devel (Red Hat package)
kernel-debuginfo-common-ppc64le (Red Hat package)
kernel-zfcpdump-modules-extra (Red Hat package)
kernel-debug-core (Red Hat package)
kernel-debuginfo (Red Hat package)
kernel-debug-uki-virt (Red Hat package)
kernel-debug-modules-extra (Red Hat package)
kernel-debug-modules-core (Red Hat package)
kernel-debug-modules (Red Hat package)
kernel-debug-devel-matched (Red Hat package)
kernel-debug-devel (Red Hat package)
kernel-debug-debuginfo (Red Hat package)
kernel-rt-debug-modules-extra (Red Hat package)
kernel-debug (Red Hat package)
kernel-rt-64k-devel (Red Hat package)
kernel-rt-64k-modules (Red Hat package)
kernel-rt-64k-modules-core (Red Hat package)
kernel-rt-64k-modules-extra (Red Hat package)
kernel-cross-headers (Red Hat package)
kernel-tools-libs-devel (Red Hat package)
libperf (Red Hat package)
kernel-devel (Red Hat package)
kernel-rt-debuginfo (Red Hat package)
kernel-rt-debug-modules-core (Red Hat package)
kernel-rt-debug-modules (Red Hat package)
kernel-rt-debug-debuginfo (Red Hat package)
kernel-rt-debug-core (Red Hat package)
kernel-rt-debug (Red Hat package)
kernel-rt-core (Red Hat package)
kernel-modules-extra-matched (Red Hat package)
kernel-modules-extra (Red Hat package)
kernel-modules-core (Red Hat package)
kernel-modules (Red Hat package)
kernel-headers (Red Hat package)
kernel-devel-matched (Red Hat package)
kernel-debuginfo-common-x86_64 (Red Hat package)
linux-oem-7.0 (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-oracle-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)
linux-nvidia-bos (Ubuntu package)

How to mitigate CVE-2026-53062

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel (Red Hat package) - addressed in versions 4.18.0-553.166.1.el8_10, 5.14.0-687.50.1.el9_8
kernel-rt (Red Hat package) - addressed in versions 4.18.0-553.166.1.rt7.507.el8_10, 6.12.0-211.58.1.el10_2
linux (Ubuntu package) - addressed in versions 5.15.0.184.155, 5.15.0-184.194, 5.15.0-184.194~20.04.1, 5.15.0.186.166, 5.15.0-186.196, 5.15.0-186.196~20.04.1, 5.15.0.1075.78, 5.15.0-1075.79, 5.15.0.1095.94, 5.15.0-1095.103, 5.15.0.1104.100, 5.15.0-1104.109, 5.15.0.1108.107, 5.15.0-1108.114, 5.15.0.1111.115, 5.15.0-1111.120+fips1, 5.15.0.1112.102, 5.15.0.1112.109, 5.15.0-1112.122, 5.15.0-1112.122+fips1, 6.8.0-136.136, 6.8.0-1046.50, 6.8.0-1059.67, 6.8.0-1064.72, 6.8.0-1064.72~22.04.1, 6.8.1-1056.57, 6.8.1-1056.57~22.04.2, 7.0.0-28.28, 7.0.0-28.28.1, 7.0.0-1003.4, 7.0.0-1008.8
linux-aws (Ubuntu package) - addressed in versions 5.15.0.186.109, 5.15.0-186.196+fips1, 5.15.0.1106.103, 5.15.0-1106.110, 5.15.0.1107.107, 5.15.0-1107.108, 5.15.0.1112.108, 5.15.0.1112.115, 5.15.0-1112.119, 5.15.0-1112.119+fips1, 5.15.0-1112.119~20.04.1, 6.8.0-1061.64+1, 7.0.0-1009.9, 7.0.0-1015.15
linux-nvidia-tegra (Ubuntu package) - addressed in versions 5.15.0-1053.53, 5.15.0.1053.55, 5.15.0.1064.64, 5.15.0-1064.66
linux-nvidia-tegra-5.15 (Ubuntu package) - update to 5.15.0-1064.66~20.04.1
linux-intel-iot-realtime (Ubuntu package) - addressed in versions 5.15.0-1104.106, 5.15.0.1104.108, 5.15.0-1107.113~20.04.1
linux-raspi (Ubuntu package) - addressed in versions 5.15.0.1106.104, 5.15.0-1106.109, 6.8.0-1061.65, 6.8.0-2050.52
linux-intel-iotg (Ubuntu package) - addressed in versions 5.15.0.1107.106, 5.15.0-1107.113
linux-azure (Ubuntu package) - addressed in versions 5.15.0.1109.105, 5.15.0-1109.115, 5.15.0.1117.115, 5.15.0-1117.126, 6.8.0-1063.71, 6.8.0-1063.71~22.04.1, 7.0.0-1009.9, 7.0.0-1010.10
linux-azure-5.15 (Ubuntu package) - addressed in versions 5.15.0-1109.115~20.04.1, 5.15.0-1117.126~20.04.1, 5.15.0-1117.126~20.04.2
linux-gcp-5.15 (Ubuntu package) - update to 5.15.0-1112.122~20.04.1
linux-azure-fips (Ubuntu package) - addressed in versions 5.15.0.1117.102, 5.15.0-1117.126+fips1, 6.8.0-1063.71+fips2
linux-azure-fde (Ubuntu package) - addressed in versions 5.15.0-1117.126, 6.8.0-1062.69
linux-fips (Ubuntu package) - addressed in versions 6.8.0-136.136+fips2, 6.8.0-136.136.2, 6.8.0-136.136.2~22.04.1, 6.8.0-1058.61
linux-hwe-6.8 (Ubuntu package) - update to 6.8.0-136.136~22.04.1
linux-ibm (Ubuntu package) - addressed in versions 6.8.0-1030.31, 6.8.0-1033.34, 6.8.0-1061.62, 6.8.0-1061.62~22.04.1, 7.0.0-1008.8, 7.0.0-1010.10
linux-oracle-6.8 (Ubuntu package) - update to 6.8.0-1058.61~22.04.1
linux-nvidia (Ubuntu package) - addressed in versions 6.8.0-1059.62, 6.8.0-1059.62.1, 6.8.0-1059.62~22.04.1, 7.0.0-1016.16, 7.0.0-1016.16~24.04.1
linux-aws-6.8 (Ubuntu package) - addressed in versions 6.8.0-1061.64+fips1, 6.8.0-1061.64~22.04.1
linux-azure-fde-6.8 (Ubuntu package) - update to 6.8.0-1062.69~22.04.1
linux-gcp-fips (Ubuntu package) - update to 6.8.0-1064.72+fips1
kernel-zfcpdump-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
python3-perf (Red Hat package) - update to 6.12.0-211.58.1.el10_2
rtla (Red Hat package) - update to 6.12.0-211.58.1.el10_2
rv (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debuginfo-common-s390x (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-zfcpdump (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-tools-debuginfo (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-zfcpdump-devel (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-zfcpdump-devel-matched (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-zfcpdump-modules (Red Hat package) - update to 6.12.0-211.58.1.el10_2
perf (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-uki-virt-addons (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-uki-virt (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-tools-libs (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-64k-debug-devel-matched (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-tools (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-modules-extra (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-modules-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-modules (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-devel (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-debuginfo (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-debug-modules-extra (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-debug-modules-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-debug-modules (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-debug-devel (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-debug-debuginfo (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-debug-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-debug (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-zfcpdump-modules-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debuginfo-common-aarch64 (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-64k-devel-matched (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-64k-devel (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-64k-debuginfo (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-debug-devel (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-64k-debug-devel (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debuginfo-common-ppc64le (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-zfcpdump-modules-extra (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debug-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debuginfo (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debug-uki-virt (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debug-modules-extra (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debug-modules-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debug-modules (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debug-devel-matched (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debug-devel (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debug-debuginfo (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-debug-modules-extra (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debug (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-devel (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-modules (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-modules-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-modules-extra (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-cross-headers (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-tools-libs-devel (Red Hat package) - update to 6.12.0-211.58.1.el10_2
libperf (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-devel (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-debuginfo (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-debug-modules-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-debug-modules (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-debug-debuginfo (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-debug-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-debug (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-modules-extra-matched (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-modules-extra (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-modules-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-modules (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-headers (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-devel-matched (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debuginfo-common-x86_64 (Red Hat package) - update to 6.12.0-211.58.1.el10_2
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1009.9
linux-gcp-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-oracle-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-azure-7.0 (Ubuntu package) - update to 7.0.0-1014.14~24.04.1
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2016.16

External References

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