Out-of-bounds read in Linux kernel - CVE-2026-43450
Published: May 8, 2026
Vulnerability identifier: #VU130733
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-43450
CWE-ID: CWE-125
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 a denial of service.
The vulnerability exists due to out-of-bounds read in nfnl_cthelper_dump_table() when handling netlink dump requests after a previously saved helper entry is deleted between dump rounds. A local user can trigger the affected dump logic to cause a denial of service.
The issue is triggered when the saved "last" helper is deleted between dump rounds, causing a restart path to bypass the loop bounds check.
How to mitigate CVE-2026-43450
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/05018cd9370f77bb18fbf6e15ff33c7a06f10b3c
- https://git.kernel.org/stable/c/0605e1985a95d4334a67869aee45a47e82301abf
- https://git.kernel.org/stable/c/3cc328ffc32ddb389cba7b78b6aa95d995c2876e
- https://git.kernel.org/stable/c/4a1f6ee69267a5f524102c028981410eeacfa3da
- https://git.kernel.org/stable/c/61b3a1f8621df1a5928118313f133996f6a786db
- https://git.kernel.org/stable/c/6dcee8496d53165b2d8a5909b3050b62ae71fe89
- https://git.kernel.org/stable/c/894c5780ddadd5fde0e16f66587918e6be1504c4
- https://git.kernel.org/stable/c/92441f6d9405a0c18d03f278b395e782f79a4a30