CVE-2026-43333
Medium
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.
SeverityMedium
CVSS5.5
Exploit probability—
Product
Linux Kernel
PublishedMay 8, 2026
First seenMay 8, 2026
Weakness typeCWE-476NULL pointer dereference
How to fix
Update
- linux linux_kernel5.15.203, 6.1.168, 6.6.134, 6.12.81, 6.18.22, 6.19.12 or later
Patches
- git.kernel.org/stable/c/10bc4a4dcded509c5d5c67d497900c3922c604cd
- git.kernel.org/stable/c/21a10c06ffae24cb01fd174a7ab7736001d2ea56
- git.kernel.org/stable/c/4f6c99dc0420f1a3d671c1b8ab8a7ac84d9cba09
- git.kernel.org/stable/c/63276547debc4d8a73eefb2c5273b2a905c961b0
- git.kernel.org/stable/c/70abd9d118da2f56beb4ec22e3a29becae373535
- git.kernel.org/stable/c/8755066f7bd0f4ac46a29d1708c7b20894539252
- git.kernel.org/stable/c/b0db1accbc7395657c2b79db59fa9fae0d6656f3
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 5.15.37 ≤ v < 5.15.203, 5.16.11 ≤ v < 6.1.168, 6.2 ≤ v < 6.6.134, 6.7 ≤ v < 6.12.81, 6.13 ≤ v < 6.18.22, 6.19 ≤ v < 6.19.12, 7.0 | 5.15.203, 6.1.168, 6.6.134, 6.12.81, 6.18.22, 6.19.12 |
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