CVE-2026-45971 Details
Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Limit bpf program signature size Practical BPF signatures are significantly smaller than KMALLOC_MAX_CACHE_SIZE Allowing larger sizes opens the door for abuse by passing excessive size values and forcing the kernel into expensive allocation paths (via kmalloc_large or vmalloc).
A vulnerability in the Linux kernel's BPF (Berkeley Packet Filter) implementation allows for excessive signature sizes, which can be exploited to force the kernel into costly memory allocation processes. This issue arises because practical BPF signature sizes are much smaller than the maximum cache size for kernel memory allocations. By passing oversized values, an attacker could potentially abuse this behavior, leading to performance degradation.
Users can update to the latest version of the Linux kernel where this vulnerability has been addressed. Instructions for updating the kernel can be found in the official Linux documentation or through the package management system for the specific Linux distribution in use.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/5835a077c6f5c565d525eaca9fac01572b97a9b9 | kernel.org | Patch |
| https://git.kernel.org/stable/c/ea1535e28bb3773fc0b3cbd1f3842b808016990c | kernel.org | Patch |
| https://git.kernel.org/stable/c/eb8166c79097996396468a341de258a798789d36 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.18, < 6.18.14 >= 6.19, < 6.19.4 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| Jun 16, 2026 | Initial Analysis | [email protected] |
| May 27, 2026 | New CVE Received | kernel.org |