Stack-based buffer overflow in Linux kernel - CVE-2026-53267

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Main Vulnerability Database Vulnerabilities #VU135489

Stack-based buffer overflow in Linux kernel - CVE-2026-53267

Published: June 26, 2026


Vulnerability identifier: #VU135489
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-53267
CWE-ID: CWE-121
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to cause memory corruption.

The vulnerability exists due to a stack-based buffer overflow in nft_ct_get_eval and nft_ct_get_fast_eval in the netfilter nft_ct subsystem when processing a crafted nftables rule that uses a template conntrack object. A local user can create a crafted rule sequence to cause memory corruption.

The issue is triggered when a conntrack template created by a preceding expression is treated as a real conntrack entry by a subsequent expression on the same skb.


Affected software

Linux kernel
openEuler
Ubuntu
bpftool
kernel
python3-perf-debuginfo
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-source
kernel-headers
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
linux (Ubuntu package)
linux-azure (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-oracle-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-ibm (Ubuntu package)
linux-azure-7.0 (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-nvidia-7.0 (Ubuntu package)
linux-raspi (Ubuntu package)
linux-nvidia-bos (Ubuntu package)

How to mitigate CVE-2026-53267

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
bpftool - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.1.20.157
kernel - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.1.20.157
python3-perf-debuginfo - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.1.20.157
python3-perf - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.1.20.157
perf-debuginfo - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.1.20.157
perf - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.1.20.157
kernel-tools-devel - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.1.20.157
kernel-tools-debuginfo - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.1.20.157
kernel-tools - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.1.20.157
kernel-source - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.1.20.157
kernel-headers - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.1.20.157
kernel-devel - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.1.20.157
kernel-debugsource - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.1.20.157
kernel-debuginfo - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.1.20.157
bpftool-debuginfo - addressed in versions 5.10.0-326.0.0.227, 6.6.0-145.1.20.157
linux (Ubuntu package) - addressed in versions 7.0.0-31.31, 7.0.0-31.31.1, 7.0.0-31.31~24.04.1, 7.0.0-1006.7, 7.0.0-1011.11~24.04.1, 7.0.0-1012.12, 7.0.0-1012.12~24.04.1
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1011.11, 7.0.0-1014.14
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-oem-7.0 (Ubuntu package) - update to 7.0.0-1013.13
linux-ibm (Ubuntu package) - update to 7.0.0-1013.13
linux-azure-7.0 (Ubuntu package) - update to 7.0.0-1014.14~24.04.1
linux-nvidia (Ubuntu package) - update to 7.0.0-1018.18
linux-nvidia-7.0 (Ubuntu package) - update to 7.0.0-1018.18~24.04.1
linux-raspi (Ubuntu package) - update to 7.0.0-1019.19
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2018.18

External References

Related Security Bulletins