CVE-2026-43333 Details
Description
In the Linux kernel, the following vulnerability has been resolved: bpf: reject direct access to nullable PTR_TO_BUF pointers check_mem_access() matches PTR_TO_BUF via base_type() which strips PTR_MAYBE_NULL, allowing direct dereference without a null check. Map iterator ctx->key and ctx->value are PTR_TO_BUF | PTR_MAYBE_NULL. On stop callbacks these are NULL, causing a kernel NULL dereference. Add a type_may_be_null() guard to the PTR_TO_BUF branch, matching the existing PTR_TO_BTF_ID pattern.
A vulnerability in the Linux kernel's BPF (Berkeley Packet Filter) implementation allows for a NULL pointer dereference. This issue arises because the BPF verifier's memory access checks do not properly account for nullable pointers. Specifically, pointers to buffers can be marked as nullable, but the verification process strips this information away, leading to a direct dereference without a null check. This vulnerability is present in the Linux kernel stable tree.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been fixed.
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
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/10bc4a4dcded509c5d5c67d497900c3922c604cd | kernel.org | Patch |
| https://git.kernel.org/stable/c/21a10c06ffae24cb01fd174a7ab7736001d2ea56 | kernel.org | Patch |
| https://git.kernel.org/stable/c/4f6c99dc0420f1a3d671c1b8ab8a7ac84d9cba09 | kernel.org | Patch |
| https://git.kernel.org/stable/c/63276547debc4d8a73eefb2c5273b2a905c961b0 | kernel.org | Patch |
| https://git.kernel.org/stable/c/70abd9d118da2f56beb4ec22e3a29becae373535 | kernel.org | Patch |
| https://git.kernel.org/stable/c/8755066f7bd0f4ac46a29d1708c7b20894539252 | kernel.org | Patch |
| https://git.kernel.org/stable/c/b0db1accbc7395657c2b79db59fa9fae0d6656f3 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-476 | NULL Pointer Dereference | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 5.15.37, < 5.15.203 >= 5.16.11, < 6.1.168 >= 6.2, < 6.6.134 >= 6.7, < 6.12.81 >= 6.13, < 6.18.22 >= 6.19, < 6.19.12 7.0 rc1 7.0 rc2 7.0 rc3 7.0 rc4 7.0 rc5 7.0 rc6 |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 15, 2026 | Initial Analysis | [email protected] |
| May 8, 2026 | New CVE Received | kernel.org |