CVE-2026-43333
MEDIUM
MEDIUM
Priority: 0.01
BB Relevance:
36/100
Published: 2026-05-08
Modified: 2026-11-11
First seen: 2026-11-06
Status: active
Attack Surface
Low Complexity
No Interaction
CVSS Vector Breakdown
AV:
Local
AC:
Low
PR:
Low
UI:
None
S:
Unchanged
C:
None
I:
None
A:
High
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.
Weakness Classification (1)
Affected Software (18)
| Vendor | Product | Version |
|---|---|---|
| Linux | Linux | b453361384c2db1c703dacb806d5fd36aec4ceca < 10bc4a4dcded509c5d5c67d497900c3922c604cd |
| Linux | Linux | 20b2aff4bc15bda809f994761d5719827d66c0b4 < 21a10c06ffae24cb01fd174a7ab7736001d2ea56 |
| Linux | Linux | 20b2aff4bc15bda809f994761d5719827d66c0b4 < 8755066f7bd0f4ac46a29d1708c7b20894539252 |
| Linux | Linux | 20b2aff4bc15bda809f994761d5719827d66c0b4 < 70abd9d118da2f56beb4ec22e3a29becae373535 |
| Linux | Linux | 20b2aff4bc15bda809f994761d5719827d66c0b4 < 63276547debc4d8a73eefb2c5273b2a905c961b0 |
| Linux | Linux | 20b2aff4bc15bda809f994761d5719827d66c0b4 < 4f6c99dc0420f1a3d671c1b8ab8a7ac84d9cba09 |
| Linux | Linux | 20b2aff4bc15bda809f994761d5719827d66c0b4 < b0db1accbc7395657c2b79db59fa9fae0d6656f3 |
| Linux | Linux | e982070f8970bb62e69ed7c9cafff886ed200349 |
| Linux | Linux | 5.15.37 < 5.15.203 |
| Linux | Linux | 5.16.11 < 5.17 |
| Linux | Linux | 5.17 |
| linux | linux_kernel | 5.15.37 – 5.15.203 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |