Stack-based buffer overflow in Linux kernel - CVE-2026-53267
Published: June 26, 2026
Vulnerability identifier: #VU135489
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-53267
CWE-ID: CWE-121
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
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.
How to mitigate CVE-2026-53267
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/2e154b5f53f1b0b490c7b8b02499f90feb86b1d5
- https://git.kernel.org/stable/c/3027ecbdb5fdf9200251c21d4818e4c447ef78e1
- https://git.kernel.org/stable/c/8470f676eadeab99132708acb1a85915664d6115
- https://git.kernel.org/stable/c/af80f78ce984649e1698b841cd33f4fa505ad828
- https://git.kernel.org/stable/c/f071b0bf078146368d18e4eec386bf2ddc0ab7e0