Use-after-free in Linux kernel - CVE-2026-53264

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Main Vulnerability Database Vulnerabilities #VU135486

Use-after-free in Linux kernel - CVE-2026-53264

Published: June 26, 2026


Vulnerability identifier: #VU135486
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-53264
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 a use-after-free in the net/sched action lifecycle handling in act_api when NEWTFILTER and DELFILTER are run concurrently. A local user can trigger concurrent filter operations to cause a denial of service.

The issue arises from a race between action lookup and action deletion under RCU-protected access.


Affected software

Linux kernel
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 x86_64
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
openEuler
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
kernel (Red Hat package)
kernel-devel-matched (Red Hat package)
kernel-devel (Red Hat package)
kernel-headers (Red Hat package)
kernel-tools-debuginfo (Red Hat package)
libperf-debuginfo (Red Hat package)
perf (Red Hat package)
perf-debuginfo (Red Hat package)
python3-perf-debuginfo (Red Hat package)
rtla (Red Hat package)
rv (Red Hat package)
kernel-debuginfo-common-ppc64le (Red Hat package)
kernel-64k-debug-debuginfo (Red Hat package)
kernel-64k-debug-devel (Red Hat package)
kernel-64k-debug-devel-matched (Red Hat package)
kernel-64k-debuginfo (Red Hat package)
kernel-64k-devel (Red Hat package)
kernel-64k-devel-matched (Red Hat package)
kernel-debuginfo (Red Hat package)
kernel-debuginfo-common-aarch64 (Red Hat package)
kernel-debuginfo-common-s390x (Red Hat package)
kernel-zfcpdump-debuginfo (Red Hat package)
kernel-zfcpdump-devel (Red Hat package)
kernel-zfcpdump-devel-matched (Red Hat package)
kernel-debuginfo-common-x86_64 (Red Hat package)
kernel-debug-devel-matched (Red Hat package)
kernel-debug-devel (Red Hat package)
kernel-debug-debuginfo (Red Hat package)
bpftool
kernel
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-devel
kernel-headers
kernel-source
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python3-perf
python3-perf-debuginfo
bpftool (Red Hat package)
bpftool-debuginfo (Red Hat package)

How to mitigate CVE-2026-53264

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel (Red Hat package) - addressed in versions 5.14.0-284.187.1.el9_2, 5.14.0-427.144.1.el9_4, 5.14.0-570.134.1.el9_6, 5.14.0-687.39.1.el9_8, 6.12.0-211.47.1.el10_2
kernel-devel-matched (Red Hat package) - update to 5.14.0-427.144.1.el9_4
kernel-devel (Red Hat package) - update to 5.14.0-427.144.1.el9_4
kernel-headers (Red Hat package) - update to 5.14.0-427.144.1.el9_4
kernel-tools-debuginfo (Red Hat package) - update to 5.14.0-427.144.1.el9_4
libperf-debuginfo (Red Hat package) - update to 5.14.0-427.144.1.el9_4
perf (Red Hat package) - update to 5.14.0-427.144.1.el9_4
perf-debuginfo (Red Hat package) - update to 5.14.0-427.144.1.el9_4
python3-perf-debuginfo (Red Hat package) - update to 5.14.0-427.144.1.el9_4
rtla (Red Hat package) - update to 5.14.0-427.144.1.el9_4
rv (Red Hat package) - update to 5.14.0-427.144.1.el9_4
kernel-debuginfo-common-ppc64le (Red Hat package) - update to 5.14.0-427.144.1.el9_4
kernel-64k-debug-debuginfo (Red Hat package) - update to 5.14.0-427.144.1.el9_4
kernel-64k-debug-devel (Red Hat package) - update to 5.14.0-427.144.1.el9_4
kernel-64k-debug-devel-matched (Red Hat package) - update to 5.14.0-427.144.1.el9_4
kernel-64k-debuginfo (Red Hat package) - update to 5.14.0-427.144.1.el9_4
kernel-64k-devel (Red Hat package) - update to 5.14.0-427.144.1.el9_4
kernel-64k-devel-matched (Red Hat package) - update to 5.14.0-427.144.1.el9_4
kernel-debuginfo (Red Hat package) - update to 5.14.0-427.144.1.el9_4
kernel-debuginfo-common-aarch64 (Red Hat package) - update to 5.14.0-427.144.1.el9_4
kernel-debuginfo-common-s390x (Red Hat package) - update to 5.14.0-427.144.1.el9_4
kernel-zfcpdump-debuginfo (Red Hat package) - update to 5.14.0-427.144.1.el9_4
kernel-zfcpdump-devel (Red Hat package) - update to 5.14.0-427.144.1.el9_4
kernel-zfcpdump-devel-matched (Red Hat package) - update to 5.14.0-427.144.1.el9_4
kernel-debuginfo-common-x86_64 (Red Hat package) - update to 5.14.0-427.144.1.el9_4
kernel-debug-devel-matched (Red Hat package) - update to 5.14.0-427.144.1.el9_4
kernel-debug-devel (Red Hat package) - update to 5.14.0-427.144.1.el9_4
kernel-debug-debuginfo (Red Hat package) - update to 5.14.0-427.144.1.el9_4
bpftool - update to 6.6.0-145.1.20.157
kernel - update to 6.6.0-145.1.20.157
bpftool-debuginfo - update to 6.6.0-145.1.20.157
kernel-debuginfo - update to 6.6.0-145.1.20.157
kernel-debugsource - update to 6.6.0-145.1.20.157
kernel-devel - update to 6.6.0-145.1.20.157
kernel-headers - update to 6.6.0-145.1.20.157
kernel-source - update to 6.6.0-145.1.20.157
kernel-tools - update to 6.6.0-145.1.20.157
kernel-tools-debuginfo - update to 6.6.0-145.1.20.157
kernel-tools-devel - update to 6.6.0-145.1.20.157
perf - update to 6.6.0-145.1.20.157
perf-debuginfo - update to 6.6.0-145.1.20.157
python3-perf - update to 6.6.0-145.1.20.157
python3-perf-debuginfo - update to 6.6.0-145.1.20.157
bpftool (Red Hat package) - update to 7.3.0-427.144.1.el9_4
bpftool-debuginfo (Red Hat package) - update to 7.3.0-427.144.1.el9_4

External References

Related Security Bulletins